hi!
I think you just have to know the rate law graphs and how to construct a reaction diagram (I think that's what it's called)
hope this helps!
Search found 116 matches
- Fri Mar 12, 2021 11:39 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Graphs to know for finals
- Replies: 11
- Views: 651
- Fri Mar 12, 2021 11:38 am
- Forum: General Rate Laws
- Topic: waters and solids in rate law?
- Replies: 4
- Views: 445
Re: waters and solids in rate law?
hi!
I thought that any and every reactant (as long as it is not an intermediate or solvent) could be included in the rate law.
someone correct me if I'm wrong! (I am not sure)
I thought that any and every reactant (as long as it is not an intermediate or solvent) could be included in the rate law.
someone correct me if I'm wrong! (I am not sure)
- Fri Mar 12, 2021 11:36 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kp Units
- Replies: 5
- Views: 404
Re: Kp Units
hi!
I thought that you could use either "bar" or "atm" when it came to calculating with pressures.
someone correct me if I'm wrong!
I thought that you could use either "bar" or "atm" when it came to calculating with pressures.
someone correct me if I'm wrong!
- Fri Mar 12, 2021 11:35 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: sapling week 9/10 #15
- Replies: 3
- Views: 261
Re: sapling week 9/10 #15
hi!
Some things that I usually double check for these problems:
1) did I use ln
2) did I remember to account for any 10^x
3) did I use the correct conversion (1000 J = 1 kJ)
4) did I remember to cancel out/include negatives
hope this helps!
Some things that I usually double check for these problems:
1) did I use ln
2) did I remember to account for any 10^x
3) did I use the correct conversion (1000 J = 1 kJ)
4) did I remember to cancel out/include negatives
hope this helps!
- Fri Mar 12, 2021 11:33 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell diagrams and inert electrodes
- Replies: 1
- Views: 127
Re: Cell diagrams and inert electrodes
hi!
I have heard that using Pt is only for situations when no other solid is present in a given reaction. Not sure if this is 100% accurate though.
would appreciate someone clarifying this!
I have heard that using Pt is only for situations when no other solid is present in a given reaction. Not sure if this is 100% accurate though.
would appreciate someone clarifying this!
- Fri Mar 12, 2021 11:32 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Creating Galvanic Cell Diagrams
- Replies: 3
- Views: 226
Re: Creating Galvanic Cell Diagrams
hi!
I have heard the general rule is: add Pt(s) when no solid is available in the given reaction. I am not sure if this is 100% accurate though.
would appreciate someone clarifying this!
I have heard the general rule is: add Pt(s) when no solid is available in the given reaction. I am not sure if this is 100% accurate though.
would appreciate someone clarifying this!
- Sat Mar 06, 2021 6:12 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Short hand notation for galvanic cells
- Replies: 6
- Views: 386
Re: Short hand notation for galvanic cells
hi!
do you mean the notation where its like ||
if so, then the || is equivalent to the salt bridge
and | is just to show that there are substances in different states (aq or s).
you always have the || dividing the anode and cathode
hope this helps!
do you mean the notation where its like ||
if so, then the || is equivalent to the salt bridge
and | is just to show that there are substances in different states (aq or s).
you always have the || dividing the anode and cathode
hope this helps!
- Sat Mar 06, 2021 11:35 am
- Forum: Experimental Details
- Topic: meaning of linear lines in graphs (order of reactions)
- Replies: 3
- Views: 1111
meaning of linear lines in graphs (order of reactions)
hi!
what is the significance of linearity in graphs? I still don't understand the concept. Also, is the general rule: for a reaction to be "x" order, the graph must be linear??
thanks in advance!
what is the significance of linearity in graphs? I still don't understand the concept. Also, is the general rule: for a reaction to be "x" order, the graph must be linear??
thanks in advance!
- Sat Mar 06, 2021 11:32 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: what is slow? fast?
- Replies: 11
- Views: 1489
what is slow? fast?
hi! I am a bit confused on what exactly constitutes a slow or fast reaction. Are we basing this solely on a numerical value? Or will we always have to look at a reaction and think which reactant will determine the "speed" of a reaction? any and every interpretation is appreciated. thanks i...
- Sat Mar 06, 2021 11:28 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: k'
- Replies: 8
- Views: 553
Re: k'
hi!
I think k' is only referring to the overall reaction and when there are multiple reactants. I am not quite sure if Lavelle reviewed how to find k from k' in lecture.
would appreciate someone explaining this!
I think k' is only referring to the overall reaction and when there are multiple reactants. I am not quite sure if Lavelle reviewed how to find k from k' in lecture.
would appreciate someone explaining this!
- Sat Mar 06, 2021 11:25 am
- Forum: Student Social/Study Group
- Topic: Note Taking
- Replies: 145
- Views: 15393
Re: Note Taking
hi! I really like handwritten notes. I have been using the same chemistry notebook for Chem 14A and Chem 14B so it really helps me when I need to review concepts that are present in both classes. I do like to print out worksheets from step up sessions and workshops though, because sometimes writing ...
- Sat Mar 06, 2021 11:22 am
- Forum: Student Social/Study Group
- Topic: Chem 14C
- Replies: 17
- Views: 864
Re: Chem 14C
hi! I have also heard mixed reviews. One thing that seems to be consistent is that if you like biology, org chem will be easier?? not sure if this is true. But I think it really depends on how you think problems through. Some people get ochem right off the bat and some don't. But don't feel discoura...
- Sun Feb 28, 2021 6:59 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: X electrode and Y electrode
- Replies: 4
- Views: 280
Re: X electrode and Y electrode
hi!
I believe this has to do with the fact that the transfer of electrons corresponds with the transfer of mass. When the electrons move to the Y electrode, the specific element builds up on the electrode.
hope this makes sense!
I believe this has to do with the fact that the transfer of electrons corresponds with the transfer of mass. When the electrons move to the Y electrode, the specific element builds up on the electrode.
hope this makes sense!
- Sun Feb 28, 2021 6:58 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Balancing equations
- Replies: 5
- Views: 260
Re: Balancing equations
hi
I was also wondering if someone could provide a quick explanation as well!!
thanks in advance!
I was also wondering if someone could provide a quick explanation as well!!
thanks in advance!
- Sun Feb 28, 2021 6:56 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Sapling W7/8 #7
- Replies: 3
- Views: 224
Re: Sapling W7/8 #7
hi!
I think when writing a cell diagram notation, the coefficients do not matter as we really want to know the general position.
someone correct me if I'm wrong!
I think when writing a cell diagram notation, the coefficients do not matter as we really want to know the general position.
someone correct me if I'm wrong!
- Sun Feb 28, 2021 6:55 pm
- Forum: General Rate Laws
- Topic: Unique Rates
- Replies: 6
- Views: 295
Re: Unique Rates
hi!
I think this just has something to do with wanting to find the speed of the specific reaction (kinetics).
someone correct me if I'm wrong!
I think this just has something to do with wanting to find the speed of the specific reaction (kinetics).
someone correct me if I'm wrong!
- Sun Feb 28, 2021 6:53 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Sapling #10
- Replies: 2
- Views: 151
Re: Sapling #10
hi!
I don't know if this is correct, but I associate being able to oxidize something with size of the element. So the larger the element, the better it is at oxidizing and giving e- away.
someone correct me if I'm wrong!
I don't know if this is correct, but I associate being able to oxidize something with size of the element. So the larger the element, the better it is at oxidizing and giving e- away.
someone correct me if I'm wrong!
- Sun Feb 28, 2021 6:50 pm
- Forum: Student Social/Study Group
- Topic: Playlist
- Replies: 86
- Views: 6352
Re: Playlist
hi!
We should so make a Chemistry Spotify Playlist!!
I love Colony House <3
https://www.youtube.com/channel/UCBUF-M ... m4ziKfGp4A
(YouTube ^^)
We should so make a Chemistry Spotify Playlist!!
I love Colony House <3
https://www.youtube.com/channel/UCBUF-M ... m4ziKfGp4A
(YouTube ^^)
- Sun Feb 28, 2021 6:49 pm
- Forum: Student Social/Study Group
- Topic: What organizations are you guys in?
- Replies: 53
- Views: 3007
Re: What organizations are you guys in?
hi!
I am a part of Bruins Fighting Pediatric Cancer (BFPC), Association of Chinese Americans (ACA), Bruin Medical Review, Life Science Student Association, and CURE!
I am a part of Bruins Fighting Pediatric Cancer (BFPC), Association of Chinese Americans (ACA), Bruin Medical Review, Life Science Student Association, and CURE!
- Sat Feb 20, 2021 12:39 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: electrochemical cells
- Replies: 2
- Views: 200
Re: electrochemical cells
hi!
I found this post on Research Gate. Hope it helps!
https://www.researchgate.net/post/What_ ... _and_Pt111
I found this post on Research Gate. Hope it helps!
https://www.researchgate.net/post/What_ ... _and_Pt111
- Sat Feb 20, 2021 12:36 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Textbook Problem 5G.17
- Replies: 2
- Views: 211
Re: Textbook Problem 5G.17
Problem 5G.17 from the textbook says, "Depict the progress of the reaction graphically for the reaction in Exercise 5G.13." The reaction it is referring to is I2 (g) ----> 2I (g). The solutions manual shows I as the reactant and I2 as the product; is that because we determined in 5G.13 th...
- Sat Feb 20, 2021 12:34 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Average Kinetic Energy
- Replies: 5
- Views: 466
Re: Average Kinetic Energy
hi!
I do not think this is an equation we need to concern ourselves with as Dr. Lavelle didn't mention this in lecture. It would probably be helpful to keep in the back of our minds, though.
hope this helps!
I do not think this is an equation we need to concern ourselves with as Dr. Lavelle didn't mention this in lecture. It would probably be helpful to keep in the back of our minds, though.
hope this helps!
- Sat Feb 20, 2021 12:32 pm
- Forum: Balancing Redox Reactions
- Topic: First Lecture Galvanic Cell
- Replies: 7
- Views: 429
Re: First Lecture Galvanic Cell
hi!
I am not sure if this is right, but I believe Dr. Lavelle was generalizing the previous solutions and categorizing them as galvanic cells, as they changed chemical energy to electrical energy. (if someone could clarify this)
I am not sure if this is right, but I believe Dr. Lavelle was generalizing the previous solutions and categorizing them as galvanic cells, as they changed chemical energy to electrical energy. (if someone could clarify this)
- Sat Feb 20, 2021 12:28 pm
- Forum: Balancing Redox Reactions
- Topic: Salt Bridges
- Replies: 21
- Views: 784
Re: Salt Bridges
hi! I believe this has to do with the fact that the transfer of electrons will result in highly positive and highly negative beakers. The salt bridge helps balance out the beakers by taking ions such as Cl- in a reversed flow. This lets the redox reaction continue for a period of time (I am not sure...
- Sat Feb 20, 2021 12:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Organic and Biological examples
- Replies: 2
- Views: 170
Re: Organic and Biological examples
hi!
I believe there is a problem with ATP somewhere in the last outline (4). Also, they aren't really mathematical calculations, but there are some easy questions about isolated, closed, and open systems in outline 3 that connect to real world examples.
hope this helps!
I believe there is a problem with ATP somewhere in the last outline (4). Also, they aren't really mathematical calculations, but there are some easy questions about isolated, closed, and open systems in outline 3 that connect to real world examples.
hope this helps!
- Sun Feb 14, 2021 3:31 pm
- Forum: Student Social/Study Group
- Topic: Classes for next quarter?
- Replies: 165
- Views: 13255
Re: Classes for next quarter?
I will be taking Chem 14C, my language requirement class, a major course and two minor courses. I decided against taking Physics 5A. I was told that taking it without prior physics knowledge, and with 14C, would be horrible.
hope everyone is able to get the courses they want for next quarter!
hope everyone is able to get the courses they want for next quarter!
- Sun Feb 14, 2021 3:26 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Sapling Week 5/6 Question #20
- Replies: 2
- Views: 113
Sapling Week 5/6 Question #20
hi!
I am having trouble understanding the concept behind the curve for #20. I understand the equilibrium and how Q and K relate to each other, but what role does spontaneity and Gibbs free energy play? Could someone clarify the connection between the concepts?
thanks in advance!
I am having trouble understanding the concept behind the curve for #20. I understand the equilibrium and how Q and K relate to each other, but what role does spontaneity and Gibbs free energy play? Could someone clarify the connection between the concepts?
thanks in advance!
- Sun Feb 14, 2021 2:12 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: sapling week 5/6 #7
- Replies: 2
- Views: 183
Re: sapling week 5/6 #7
hi! So for this question you can associate most ordered with the highest deltaS value. So the values you previously calculated can be used to help determine this. I think this question is asking for which of the samples has the most disorder, since deltaS tells you entropy (disorder in a system). Th...
- Sun Feb 14, 2021 2:08 pm
- Forum: Student Social/Study Group
- Topic: Fav Shows of the Moment
- Replies: 115
- Views: 27921
Re: Fav Shows of the Moment
I am currently re-watching Good Omens on Amazon Prime. I find the plot and characters hilarious :)
hope this could bring people some good vibes for the midterm this week!
hope this could bring people some good vibes for the midterm this week!
- Sun Feb 14, 2021 2:07 pm
- Forum: General Science Questions
- Topic: using ln (Homework #18 Week 5/6)
- Replies: 2
- Views: 384
using ln (Homework #18 Week 5/6)
hi!
I am trying to solve for #18 on this week's homework but I cannot remember how to cancel out ln in an equation.
Can someone help me?
thanks in advance!
I am trying to solve for #18 on this week's homework but I cannot remember how to cancel out ln in an equation.
Can someone help me?
thanks in advance!
- Sun Feb 07, 2021 8:24 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Step Up Session Question
- Replies: 1
- Views: 130
Step Up Session Question
hi! For one of the step up sessions, a question asked: "Initially a sample of gas at 412K occupies 12.62L at 0.6789 atm. The gas is allowed to expand to 19.44 L by 2 pathways (assume gas behaves as ideal gas." I had trouble with the second pathway. "B) isothermal, irreversible expansi...
- Sun Feb 07, 2021 4:39 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Totaling Entropy and Degeneracy
- Replies: 3
- Views: 212
Re: Totaling Entropy and Degeneracy
hi!
I agree with the previous statements. kB is just a constant that follows the log rules. You don't really need to do anything to it, just remember how it fits into the whole equation when you multiple everything out.
hope this helps!
I agree with the previous statements. kB is just a constant that follows the log rules. You don't really need to do anything to it, just remember how it fits into the whole equation when you multiple everything out.
hope this helps!
- Sun Feb 07, 2021 4:37 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: All the Cs
- Replies: 4
- Views: 237
All the Cs
hi!
I was wondering if someone could clarify what all the different C equations are. I know that Cs is specific heat, but what are the other significant equations we need to know/are there any others we need to know??
thanks in advance!
I was wondering if someone could clarify what all the different C equations are. I know that Cs is specific heat, but what are the other significant equations we need to know/are there any others we need to know??
thanks in advance!
- Sun Feb 07, 2021 4:33 pm
- Forum: Calculating Work of Expansion
- Topic: Irreversible reactions?
- Replies: 2
- Views: 69
Re: Irreversible reactions?
hi! I think this has something to do with the one restriction being constant pressure. Also, since the piston is sealed, there is no place for the new material to escape and I think unless it is stated that the piston is physically pushed back, it cannot be moved and the change is irreversible. hope...
- Sun Feb 07, 2021 4:30 pm
- Forum: Student Social/Study Group
- Topic: Studying When You Don't Want to
- Replies: 48
- Views: 2505
Re: Studying When You Don't Want to
hi!
I also find things like lists and organizing helpful. Whenever I don't feel like doing work, I try and set a goal for myself. Normally I try and get at least a half hour of work done and then take a break. It slowly gets better and helps motivate me when I'm down.
I also find things like lists and organizing helpful. Whenever I don't feel like doing work, I try and set a goal for myself. Normally I try and get at least a half hour of work done and then take a break. It slowly gets better and helps motivate me when I'm down.
- Sun Jan 31, 2021 12:19 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: isolated system examples
- Replies: 4
- Views: 134
Re: isolated system examples
hi!
I agree with the above statement. But just some general rules for isolated systems:
1) no interaction with the surroundings
2) normally insulated (like a thermos)
hope this helps!
I agree with the above statement. But just some general rules for isolated systems:
1) no interaction with the surroundings
2) normally insulated (like a thermos)
hope this helps!
- Sat Jan 30, 2021 9:58 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Textbook Problem 4A5
- Replies: 1
- Views: 86
Textbook Problem 4A5
hi! I had a quick question about 4A5 part b. "A piston confines 0.200mol Ne(g) in 1.20 L at 25C. Two experiments are performed. (a) The gas is allowed to expand through an additional 1.20 L against a constant pressure of 1.00 atm. (b) The gas is allowed to expand reversibly and isothermally to ...
- Sat Jan 30, 2021 9:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Outlines and Lectures
- Replies: 4
- Views: 235
Outlines and Lectures
I was wondering if it was possible to post somewhere how the outlines correspond to the lectures and topics covered. I know the general concepts correlate with the outlines, but for specific sections would it be possible to tell us which lectures they align with? (or is something like this available...
- Sat Jan 30, 2021 8:55 pm
- Forum: Student Social/Study Group
- Topic: Spring 2021
- Replies: 106
- Views: 12140
Re: Spring 2021
I definitely recommend taking Chem 14BL as soon as you can. I find that it helps to take 14B and 14BL either together or as close as you can take them.
Hope this helps!
Hope this helps!
- Sat Jan 30, 2021 8:48 pm
- Forum: Student Social/Study Group
- Topic: Go treat yourself after MT1!
- Replies: 75
- Views: 4257
Re: Go treat yourself after MT1!
I definitely took advantage of my weekend. I watched some movies with my sister and treated myself to a very nice serving of popcorn today.
Back to the grind tomorrow! Hope everyone is having an especially restful weekend!
Back to the grind tomorrow! Hope everyone is having an especially restful weekend!
- Sun Jan 24, 2021 11:28 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Best Method for Finding Enthalpy Changes
- Replies: 6
- Views: 267
Re: Best Method for Finding Enthalpy Changes
hi!
I think it depends on what you are given for the problem, but I thought I remembered Dr. Lavelle saying the third method was the most accurate.
I think it depends on what you are given for the problem, but I thought I remembered Dr. Lavelle saying the third method was the most accurate.
- Sun Jan 24, 2021 11:26 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: enthalpy units
- Replies: 3
- Views: 198
Re: enthalpy units
hi!
I think during Friday's lecture, Dr. Lavelle goes over the calculations and how you always end up with kJ/mol. (someone correct me if I'm wrong.)
I think during Friday's lecture, Dr. Lavelle goes over the calculations and how you always end up with kJ/mol. (someone correct me if I'm wrong.)
- Sat Jan 23, 2021 11:54 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: standard states
- Replies: 6
- Views: 314
Re: standard states
Hi! Are we supposed to know the standard states of molecules? Or just some of the most common ones? Or will they be given to us? hi! so someone else said "Dr. Lavelle said that we would not be focusing on standard states that much with regards to calculations. So you probably won't have to wor...
- Sat Jan 23, 2021 11:50 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling Week 2 #8
- Replies: 3
- Views: 205
Sapling Week 2 #8
hi! So the problem says: "NH3 is a weak base ( K_{b} = 1.8×10−5 ) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.061 M in NH4Cl at 25 °C?" I set up my equation: NH_{4}Cl + H_{2}O \Leftrightarrow NH_{3} + H_{3}O^{+} I then set the respective parts for the ...
- Sat Jan 23, 2021 11:45 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling Week 2 #7
- Replies: 3
- Views: 231
Sapling Week 2 #7
hi! So the problem says: "HClO is a weak acid ( K_{a} =4.0×10−8 ) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.088 M in NaClO at 25 °C?" I set up my equation: ClO^{-} + H_{2}O \Leftrightarrow HClO + OH^{-} I then set the respective parts for the ICE box...
- Mon Jan 18, 2021 5:48 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Textbook Problems 6D
- Replies: 2
- Views: 183
Textbook Problems 6D
hi! I am trying to do 6D5 and 6D7. When I look at the solution manual, the K_{b} , K_{a} are somehow found. Could someone explain how these values were derived? Or if they were from some chart in the textbook? (If so, will there be problems like this on the midterms/final and will we be expected to ...
- Sun Jan 17, 2021 2:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Posting on Chem Community
- Replies: 6
- Views: 327
Posting on Chem Community
hi!
I had a quick question. I am not sure if this was already explained, but does it matter which section we post under?
Like if we accidentally post in the Chem 14A section will it not count towards our total posts?
thank you!
I had a quick question. I am not sure if this was already explained, but does it matter which section we post under?
Like if we accidentally post in the Chem 14A section will it not count towards our total posts?
thank you!
- Sun Jan 17, 2021 2:39 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Heating an Exothermic Reaction
- Replies: 7
- Views: 361
Re: Heating an Exothermic Reaction
Why does adding heat to an exothermic reaction favor the formation of reactants? hi! I think this has something to do with the fact that when you break something apart it releases heat. An exothermic reaction is when heat is released. So I think this means if you have an chemical reaction described...
- Sun Jan 17, 2021 2:29 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ice Box Method
- Replies: 14
- Views: 428
Re: Ice Box Method
hi! I like to think of like this: whichever thing is being used or is mentioned to be used in the problem, you are subtracting from the overall chemical equation. This helps point to whichever side of the equation will have values of -X. This in turn also tells you which things are being produced, s...
- Sun Jan 17, 2021 2:25 pm
- Forum: Student Social/Study Group
- Topic: Exercising Our Minds and Bodies
- Replies: 120
- Views: 15396
Re: Exercising Our Minds and Bodies
hi!
I usually walk around campus with my roommate (since we're down in Westwood).
I also like to hula hoop. Super easy and fun! Helps trim your waist down :)
I usually walk around campus with my roommate (since we're down in Westwood).
I also like to hula hoop. Super easy and fun! Helps trim your waist down :)
- Fri Jan 15, 2021 4:27 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Using Kw
- Replies: 5
- Views: 173
Using Kw
hi!
I had a quick question about
When do we need to use it? I know Dr. Lavelle used it for lectures this week, but could someone lay out the rules for when we use specifically?
thank you!
I had a quick question about
When do we need to use it? I know Dr. Lavelle used it for lectures this week, but could someone lay out the rules for when we use specifically?
thank you!
- Wed Jan 06, 2021 11:26 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Part 3 Module Review Question 16
- Replies: 2
- Views: 385
Part 3 Module Review Question 16
16. 1.50 mol PCl5 is placed in a 500 ml reaction vessel and decomposes at 250°C to form PCl3 and Cl2. KC = 1.80, all substances are gases at 250°C. What is the composition of the equilibrium mixture? hi! I attempted this from the audio visual topics but I can't seem to get the correct answer. could ...
- Mon Jan 04, 2021 8:11 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Part 2 Module Review Question 30
- Replies: 1
- Views: 92
Part 2 Module Review Question 30
hi!
could someone explain how they did #30 for Part 2 of the Chemical Equilibrium Review?
I was able to get the answer but I don't think I did the steps right.
I did K =
thank you in advance!
could someone explain how they did #30 for Part 2 of the Chemical Equilibrium Review?
I was able to get the answer but I don't think I did the steps right.
I did K =
thank you in advance!
- Mon Jan 04, 2021 8:08 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Part 2 Module Review Question 29
- Replies: 1
- Views: 88
Part 2 Module Review Question 29
hi!
could someone explain this problem please? I attempted it and did
K =
and plugged in 3.37 x 10 -5 for BrCl but didn't get anything close to the provided answers.
thank you in advance!
could someone explain this problem please? I attempted it and did
K =
and plugged in 3.37 x 10 -5 for BrCl but didn't get anything close to the provided answers.
thank you in advance!
- Mon Jan 04, 2021 8:05 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Part 2 Module Review Question 23
- Replies: 3
- Views: 202
Part 2 Module Review Question 23
hi! could someone explain how they did 23 for Part 2 of Chemical Equilibrium Review? I did \frac{SO_{3}}{SO_{2}O_{2}} (with SO3 to the power of 2 and SO2 to the power of 2) I plugged in 5.0 M for SO3, 5 x 10 -4 for SO2, and 2 x 10 -4 for O2 I put it was not in equilibrium and favored a reverse react...
- Mon Jan 04, 2021 7:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Part 2 Module Review Question 19
- Replies: 1
- Views: 88
Part 2 Module Review Question 19
hi! I had a question on #19 from the Part 2 Chemical Equilibrium review. I kept getting different answers than those provided. Could someone tell me what I did wrong? So for my equation I did \frac{H_{2}}{AsH_{3}} (with H2 to the 3 power and AsH3 to the 2 power) then I plugged in 1.23 x 10^{-3} and ...
- Mon Jan 04, 2021 3:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling Error
- Replies: 9
- Views: 501
Re: Sapling Error
Hey everybody. I'm trying to enroll into Sapling but i keep getting an error message pop-up saying I have to sign up for this through my instructor's course on my University's learning management system. This even happens after I clicked on the Sapling link on the CCLE page. Is this happening to an...
- Mon Jan 04, 2021 3:37 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Problem 5G11
- Replies: 5
- Views: 257
Problem 5G11
hi! for the outline, one of the questions 5G11 asks: "Write the reaction quotient Q ". I am not sure if this is covered in 5G.3/5G.4 or if it was briefly mentioned in lecture, but could someone tell me what this is? Is this just another name for the equilibrium constant K? (I was able to g...
- Tue Dec 15, 2020 11:15 am
- Forum: Student Social/Study Group
- Topic: Changing Study Habits
- Replies: 35
- Views: 1281
Re: Changing Study Habits
hi! I agree with everyone who has previously posted! I am definitely going to try and do textbook problems more thoroughly and pace myself along with the topics covered in lecture. I also found step up sessions and workshops extremely helpful! So I will definitely continue going to those if they are...
- Tue Dec 15, 2020 11:08 am
- Forum: Student Social/Study Group
- Topic: HUGE THANK YOU to Dr. Lavelle, the UAs, TAs!
- Replies: 14
- Views: 858
HUGE THANK YOU to Dr. Lavelle, the UAs, TAs!
I just wanted to say thank you to Dr. Lavelle, the UAs, the TAs, and everyone who helped make this class what it is! Thank you for helping us students learn! I know times are especially trying right now, so I just have to say thank you again for being so accommodating and giving us so many resources...
- Tue Dec 15, 2020 11:03 am
- Forum: Student Social/Study Group
- Topic: How are you?
- Replies: 154
- Views: 12397
Re: How are you?
I feel so liberated after the final!!!
Wishing everyone the best during the rest of finals week <3
Wishing everyone the best during the rest of finals week <3
- Tue Dec 15, 2020 11:02 am
- Forum: Student Social/Study Group
- Topic: Winter Break
- Replies: 44
- Views: 2042
Re: Winter Break
hi!
I find it best to keep my notebooks when it comes to a series-type class. However, I heard that you don't need to retain that much for the chem series?? could someone confirm/deny this?
I find it best to keep my notebooks when it comes to a series-type class. However, I heard that you don't need to retain that much for the chem series?? could someone confirm/deny this?
- Thu Dec 10, 2020 6:04 pm
- Forum: Naming
- Topic: "ate" and "ic"
- Replies: 4
- Views: 593
"ate" and "ic"
hi!
I am having trouble finding notes for when to place "ate" and "ic" at the end of names. When do we use these??
thank you!
I am having trouble finding notes for when to place "ate" and "ic" at the end of names. When do we use these??
thank you!
- Wed Dec 09, 2020 10:56 am
- Forum: Administrative Questions and Class Announcements
- Topic: Lecture Videos Not Playing [ENDORSED]
- Replies: 16
- Views: 678
Re: Lecture Videos Not Playing [ENDORSED]
hi! my lectures keep buffering as well. Originally I went to watch the lecture on Monday, but it wouldn't play so I waited until the next lecture would be posted to see if the issue was resolved. I went in to watch the lectures today and same thing happened :( Is there another platform that the vide...
- Sun Dec 06, 2020 4:07 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Concept of pH
- Replies: 10
- Views: 548
Re: Concept of pH
I understand how to solve for pH. But I am having a hard time conceptualizing the significance of the presence of protons (H+) in solutions? Why is knowledge of pH important and what makes a highly acidic/basic solution special? hi! so I think knowing how many H+ are present helps when determining ...
Re: Chloride
hi!
correct me if I'm wrong, but I think this has to do with prefixes?? If the element is Cl2 I think this would be read as dichloride?? So a singular Cl is just chloride?
correct me if I'm wrong, but I think this has to do with prefixes?? If the element is Cl2 I think this would be read as dichloride?? So a singular Cl is just chloride?
- Fri Dec 04, 2020 6:43 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Relative Acidity
- Replies: 2
- Views: 125
Relative Acidity
hi! I was wondering if someone could explain one of the points Dr. Lavelle mentioned in lecture. I am still a bit confused. One of his slides said: "Atoms more readily lose H+ if the resulting anion is stabilized by resonance and/or electron withdrawing atoms delocalize and stabilize negative c...
- Fri Dec 04, 2020 6:39 pm
- Forum: General Science Questions
- Topic: Tricks for Knowing Locations of Metals and Nonmetals on Periodic Table
- Replies: 8
- Views: 5544
Tricks for Knowing Locations of Metals and Nonmetals on Periodic Table
hi!
I was wondering if anyone had any tricks or tips for memorizing/knowing the general area for metals/nonmetals/metalloids on the periodic table??
thank you!
I was wondering if anyone had any tricks or tips for memorizing/knowing the general area for metals/nonmetals/metalloids on the periodic table??
thank you!
- Fri Dec 04, 2020 6:32 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3044397
Re: Post All Chemistry Jokes Here
What should you do if no one laughs at your chemistry jokes?
Keep telling them until you get a reaction.
:)
Keep telling them until you get a reaction.
:)
- Sun Nov 29, 2020 8:05 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Distinguishing Shape from # of Bonds
- Replies: 3
- Views: 89
Re: Distinguishing Shape from # of Bonds
hi!
I also have the same question. I was thinking that there would be some other factors given to us, such as number of lone pairs, that would help us determine between shapes.
Hope someone can clarify!
I also have the same question. I was thinking that there would be some other factors given to us, such as number of lone pairs, that would help us determine between shapes.
Hope someone can clarify!
- Sun Nov 29, 2020 10:59 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Seesaw Shape
- Replies: 5
- Views: 355
Seesaw Shape
hi!
I was wondering if someone could explain the seesaw thing Dr. Lavelle mentioned in lecture. I don't really understand the concept.
thank you!
I was wondering if someone could explain the seesaw thing Dr. Lavelle mentioned in lecture. I don't really understand the concept.
thank you!
- Sun Nov 29, 2020 10:51 am
- Forum: Hybridization
- Topic: sp and sp2
- Replies: 7
- Views: 382
Re: sp and sp2
hi! I am a bit confused on this as well. I was thinking along the lines of the number of bonds/lone pairs the atom has. so when you mark the electrons within sp/sp2/sp3 you should be reflecting how many bonds and lone pairs there are. So two arrows would mean a lone pair and one arrow would mean a b...
- Fri Nov 27, 2020 11:11 am
- Forum: Hybridization
- Topic: Section 2F 3b
- Replies: 2
- Views: 98
Re: Section 2F 3b
hi!
So I ran into the same issue. When I attempted this problem I automatically got the S attached to two O with double bonds. And I remembered that double bonds are 1 sigma and 1 bond, so my answer was 2 sigma and 2 . This may just be a case of either answer is correct??
So I ran into the same issue. When I attempted this problem I automatically got the S attached to two O with double bonds. And I remembered that double bonds are 1 sigma and 1 bond, so my answer was 2 sigma and 2 . This may just be a case of either answer is correct??
- Fri Nov 27, 2020 11:00 am
- Forum: Student Social/Study Group
- Topic: Happy Thanksgiving!
- Replies: 39
- Views: 1794
Re: Happy Thanksgiving!
Happy Thanksgiving!
My family doesn't take part in any special traditions, but we do make an old family recipe ham :)
Hope everyone's holidays are going well!
My family doesn't take part in any special traditions, but we do make an old family recipe ham :)
Hope everyone's holidays are going well!
- Sun Nov 22, 2020 8:54 pm
- Forum: Student Social/Study Group
- Topic: How to relax after midterms
- Replies: 54
- Views: 2639
Re: How to relax after midterms
hi!
I have really enjoyed reading this thread :)
I try to treat myself to my favorite dessert or take out. I also like to relax for a good two hours after if I can help it. This includes no homework, classwork, or even looking at my laptop.
hope everyone is having a great weekend!
I have really enjoyed reading this thread :)
I try to treat myself to my favorite dessert or take out. I also like to relax for a good two hours after if I can help it. This includes no homework, classwork, or even looking at my laptop.
hope everyone is having a great weekend!
- Sun Nov 22, 2020 11:02 am
- Forum: Administrative Questions and Class Announcements
- Topic: 14BL Waitlist?
- Replies: 1
- Views: 147
Re: 14BL Waitlist?
hi!
I have heard that you will get into the class eventually.
Don't know if someone can confirm this??
I have heard that you will get into the class eventually.
Don't know if someone can confirm this??
- Sat Nov 21, 2020 4:32 pm
- Forum: Student Social/Study Group
- Topic: Post Midterm Blues
- Replies: 71
- Views: 3220
Re: Post Midterm Blues
thought some positivity could be put out there!!
I found this quote from Jimmy Dean and I love it:
"I can't change the direction of the wind, but I can adjust my sails to always reach my destination."
You guys will totally get through this! <3 Hope you all have a great weekend!
I found this quote from Jimmy Dean and I love it:
"I can't change the direction of the wind, but I can adjust my sails to always reach my destination."
You guys will totally get through this! <3 Hope you all have a great weekend!
- Sat Nov 21, 2020 4:28 pm
- Forum: Electronegativity
- Topic: Trick for remembering periodic trends
- Replies: 11
- Views: 3341
- Sat Nov 21, 2020 3:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 14B and 14BL
- Replies: 13
- Views: 787
Re: 14B and 14BL
hi!
I will be taking both next quarter. I heard from friends that took it virtually that it was not bad. They said if you want to take it separately that is fine, you just have to remember the key concepts from 14B for BL.
hope this helps!
I will be taking both next quarter. I heard from friends that took it virtually that it was not bad. They said if you want to take it separately that is fine, you just have to remember the key concepts from 14B for BL.
hope this helps!
- Sat Nov 14, 2020 5:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem 14B/BL
- Replies: 3
- Views: 159
Re: Chem 14B/BL
hi!
so when I talked to my NSA they recommended taking these two together. I am not sure what other people are doing, but I plan to take them both next quarter.
so when I talked to my NSA they recommended taking these two together. I am not sure what other people are doing, but I plan to take them both next quarter.
- Sat Nov 14, 2020 5:25 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Weekend Posts
- Replies: 4
- Views: 145
Re: Weekend Posts
hi! As long as you post before midnight Sunday for the respective week it counts for that week. So posting 11/14 - 11/15 before Sunday at midnight counts for Week 6.
- Sat Nov 14, 2020 5:22 pm
- Forum: Lewis Structures
- Topic: Lewis acid and Lewis bases
- Replies: 8
- Views: 563
Re: Lewis acid and Lewis bases
Hello, I was having trouble with identifying the difference between a Lewis base and Lewis acid for sapling problem 6 in weeks 5. How do I figure out what is what when given a formula like BeCl2 for example ? so I have in my notes that a LEWIS acid accepts the e- pair from another atom. LEWIS base ...
- Sat Nov 14, 2020 5:18 pm
- Forum: Ionic & Covalent Bonds
- Topic: orbitals vs subshells
- Replies: 6
- Views: 181
Re: orbitals vs subshells
hi!
so the orbitals are the s, p, d, and f.
the subshells are the varying number of electrons that can be present in the orbital
s = 2 e-
p = 6 e- (3 sets of 2)
d = 10 e- (5 sets of 2)
f = 14 e- (7 sets of 2)
so the orbitals are the s, p, d, and f.
the subshells are the varying number of electrons that can be present in the orbital
s = 2 e-
p = 6 e- (3 sets of 2)
d = 10 e- (5 sets of 2)
f = 14 e- (7 sets of 2)
- Sat Nov 14, 2020 5:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lecture Video Recording
- Replies: 3
- Views: 148
Lecture Video Recording
First off, I just want to say that I appreciate the video lectures and the Bruin Cast team this quarter. <3 The added touch of "being" in the classroom and the music in the beginning of each lecture has made my fall quarter feel somewhat normal :) I was just wondering if the Bruin Cast tea...
- Sat Nov 07, 2020 2:43 pm
- Forum: Lewis Structures
- Topic: Which atom to add positive/negative charge?
- Replies: 6
- Views: 252
Re: Which atom to add positive/negative charge?
When I'm drawing the Lewis structures in Sapling homework, I have trouble determining which atom in the molecule to add the positive/negative charge. How do I assign formal charges given a polyatomic ion? Do I use the number of electrons in the periodic table to find which atom has the charge? hi! ...
- Sat Nov 07, 2020 1:43 pm
- Forum: Electronegativity
- Topic: Electronegativity Table/Chart in Lecture
- Replies: 14
- Views: 455
Electronegativity Table/Chart in Lecture
hi! Will we need to memorize the specific electronegativity for each element? In Dr. Lavelle's lecture he referenced a table/chart with some of the elements and their values. Will we be able to reference a chart like this for future tests or should we just be able to tell whether two elements will h...
- Sat Nov 07, 2020 1:34 pm
- Forum: Lewis Structures
- Topic: Negative Sign
- Replies: 12
- Views: 815
Re: Negative Sign
hi! I think what you are referring to is when Dr. Lavelle does the formal charge of an atom (minus sign on a specific element) compared to the charge of a molecule overall when drawing a lewis structure (minus sign outside of molecule)? So I think when we are asked questions about this, they will sp...
- Sat Nov 07, 2020 1:31 pm
- Forum: Ionic & Covalent Bonds
- Topic: Extra Valence Electrons
- Replies: 10
- Views: 426
Re: Extra Valence Electrons
hi!
I have in my notes that P, S, and Cl can accommodate more than 8 valence e-. These atoms in period 3 or higher have d-orbitals in their valence shells that are able to accommodate these additional e-. I think this can just be summed up to the fact that they are exceptions to the octet rule.
I have in my notes that P, S, and Cl can accommodate more than 8 valence e-. These atoms in period 3 or higher have d-orbitals in their valence shells that are able to accommodate these additional e-. I think this can just be summed up to the fact that they are exceptions to the octet rule.
- Thu Nov 05, 2020 9:22 pm
- Forum: Lewis Structures
- Topic: TB 2b 19
- Replies: 2
- Views: 133
Re: TB 2b 19
hi!
I also think this has to do with the octet rule!
I also think this has to do with the octet rule!
- Sat Oct 31, 2020 4:43 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Atomic Spectra Post-Assesment
- Replies: 4
- Views: 318
Re: Atomic Spectra Post-Assesment
43. In the hydrogen atomic spectrum, what is the wavelength of light associated with the n = 2 to n = 1 electron transition? I tried to find the wavelength by using the equation v= R [1/(n1)^2 - 1/(n2)^2], and then plugging in the value for v in wavelength = c/v, but the answer I came up with was n...
- Sat Oct 31, 2020 4:40 pm
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity
- Replies: 2
- Views: 132
Re: Electron Affinity
Here is my question on number 23. The electron affinity of thulium has been measured by a technique known as laser photodetachment electron spectroscopy. In this technique, a gaseous beam of the anions of an element is bombarded with photons from a laser. Electrons from the anion are then ejected a...
- Sat Oct 31, 2020 11:10 am
- Forum: Student Social/Study Group
- Topic: Test Scored for Midterm 1
- Replies: 49
- Views: 2002
Re: Test Scored for Midterm 1
hi!
I heard that there was an error found in one of the problems so it might take a bit longer to sort through everyone's tests.
I heard that there was an error found in one of the problems so it might take a bit longer to sort through everyone's tests.
- Sat Oct 31, 2020 11:07 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Shape of Orbitals
- Replies: 8
- Views: 321
Re: Shape of Orbitals
hi! I also think that Schrodinger's and the repulsion of electrons helps determine this shape. I also think it depends on the number of electrons present.
- Sat Oct 31, 2020 11:04 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: History of This Equation Question
- Replies: 2
- Views: 133
Re: History of This Equation Question
noelle_lipschutz_3F wrote:How was the Heisenberg uncertainty principle derived? I am still so fascinated how humans can derive these equations…
hi! I think Dr. Lavelle talks about this in the module for Heisenberg. If not, he goes over the fundamental principle behind it in lecture.
- Tue Oct 27, 2020 11:00 am
- Forum: Photoelectric Effect
- Topic: Sapling Question Converting GHz
- Replies: 2
- Views: 457
Sapling Question Converting GHz
hi! For one of the sapling questions, it asks: "Considering that microwave ovens radiate at 2.45 GHz, how would you respond to the debate?" How do you convert the GHz so that you are able to solve this equation? The Sapling "Solutions" tab did not elaborate on how to convert this...
- Fri Oct 23, 2020 5:14 pm
- Forum: Properties of Light
- Topic: Emission/Absorption
- Replies: 6
- Views: 270
Re: Emission/Absorption
How do we differentiate what n1 and n2 should be if the question doesn't state it directly? I know that emitted means that it is going back down to the ground state and absorbed means that the particle is excited. Can anyone explain this further? hi! I think 1A15 is a good example for this! I belie...
- Fri Oct 23, 2020 5:09 pm
- Forum: General Science Questions
- Topic: Rounding versus truncating
- Replies: 3
- Views: 218
Re: Rounding versus truncating
Lea Ozdere 1A wrote:For sig figs are we supposed to round or truncate? Or can we do either? For example if an answer is 2.7187 and it should be with 4 sig figs, would that be 2.718 or 2.719?
hi!
I always round. I am not sure when truncating would apply in chemistry (I would ask a TA).
So my answer would be 2.719.
- Fri Oct 23, 2020 5:08 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm length
- Replies: 4
- Views: 144
Re: Midterm length
hi!
My TA told me that the midterm would be ~10 questions (about 5 mins per question), all multiple choice.
My TA told me that the midterm would be ~10 questions (about 5 mins per question), all multiple choice.
- Wed Oct 21, 2020 10:07 am
- Forum: Properties of Light
- Topic: Textbook Question 1.A.9
- Replies: 4
- Views: 229
Re: Textbook Question 1.A.9
oh I see, thank you!
- Tue Oct 20, 2020 9:33 pm
- Forum: Properties of Light
- Topic: Textbook Question 1.A.9
- Replies: 4
- Views: 229
Textbook Question 1.A.9
hi! I am working on 1.A.9 and I am not getting the same answers as the Solutions Manual. I am using the equations 1) E = \frac{hc}{\lambda } and 2) \lambda = \frac{c}{v} . Then I just plug in the values that are in the table and solve (including converting). For the second row I plugged 3.3 x 10^{-1...