Search found 126 matches
- Fri Mar 12, 2021 6:02 am
- Forum: Student Social/Study Group
- Topic: Note Taking
- Replies: 145
- Views: 20764
Re: Note Taking
I like to handwrite my notes, especially if there are a lot of calculations involved. If you have an iPad, I would definitely recommend using GoodNotes! I used to try squeezing my notes onto a certain number of pages to limit my paper usage, but after using an iPad, I started spacing out each line o...
- Fri Mar 12, 2021 5:31 am
- Forum: Student Social/Study Group
- Topic: Fave movie/show
- Replies: 67
- Views: 6077
Re: Fave movie/show
Breanna Ouyang 1I wrote:Just finished the Queen's Gambit and would highly recommend!
omg I heard good stuff about this show! this is definitely on my watch-list
- Fri Mar 12, 2021 5:27 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Are catalysts consumed?
- Replies: 37
- Views: 2064
Re: Are catalysts consumed?
A catalyst speeds up the rate of a chemical reaction, but is not consumed!
- Thu Mar 11, 2021 4:51 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Week 10 Sapling #13
- Replies: 2
- Views: 202
Re: Week 10 Sapling #13
thank you!
- Wed Mar 10, 2021 11:15 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Week 10 Sapling #13
- Replies: 2
- Views: 202
Week 10 Sapling #13
For this question, the rate law for the slow step is k[I-][HClO], and I know that the intermediate (HClO) cannot be in the rate law, but I'm not sure what my next step would be to solve this. The overall reaction that I got after cancelling the intermediates is ClO-(aq) + I-(aq) --> Cl-(aq) + IO-(aq...
- Wed Mar 10, 2021 5:09 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: determining order [ENDORSED]
- Replies: 7
- Views: 721
determining order [ENDORSED]
Is it possible to determine the order of reactants by just looking at the given concentrations and initial rates in a table, without doing the rate law calculations? (ex: #7 on Sapling)
- Sun Mar 07, 2021 6:27 pm
- Forum: Zero Order Reactions
- Topic: graph for 1st, 2nd, and zero order reactions
- Replies: 8
- Views: 5439
- Sun Mar 07, 2021 1:52 am
- Forum: General Rate Laws
- Topic: Number of Reactants
- Replies: 26
- Views: 1177
Re: Number of Reactants
I think it is possible, but this class might only have questions that have reactions with up to 3 reactants. However, this is highly unlikely, since having 3 reactants is already not very common.
- Sun Mar 07, 2021 1:48 am
- Forum: Student Social/Study Group
- Topic: Final Study Tips!
- Replies: 38
- Views: 2600
Re: Final Study Tips!
Does anybody know if the final is accumulative or not? Also, if so do you know if it will be an even distribution of all the topics or if it will be more about the new stuff we are learning since midterm 2 and a little bit about the previous topics covered? I think the final will include everything...
- Sun Mar 07, 2021 1:42 am
- Forum: Zero Order Reactions
- Topic: graph for 1st, 2nd, and zero order reactions
- Replies: 8
- Views: 5439
graph for 1st, 2nd, and zero order reactions
What would the graphs for the 1st, 2nd, and zero order reactions look like?
- Sat Mar 06, 2021 6:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: [CHEM 14B KARAOKE]
- Replies: 68
- Views: 7648
Re: [CHEM 14B KARAOKE]
today was really fun! thank you to everyone who organized this :-)
- Sat Mar 06, 2021 2:31 am
- Forum: Second Order Reactions
- Topic: Termolecular
- Replies: 43
- Views: 2532
Re: Termolecular
termolecular reactions involve the simultaneous collision of 3 reactants
- Sun Feb 28, 2021 11:05 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling week 7/8 #18
- Replies: 25
- Views: 5238
Re: Sapling week 7/8 #18
Thank you !!!
- Sun Feb 28, 2021 11:01 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling week 7/8 #18
- Replies: 25
- Views: 5238
Re: Sapling week 7/8 #18
oops ignore the image being attached 3 times
- Sun Feb 28, 2021 11:00 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling week 7/8 #18
- Replies: 25
- Views: 5238
Sapling week 7/8 #18
I put 4Fe(s)+3O2(g)+6H2O(l)↽−−⇀2Fe2O3(s)∙6H2O(s) for the question below, and I also tried it without the phases, but it still says it's incorrect. How would I balance this?: One of the most recognizable corrosion reactions is the rusting of iron. Rust is caused by iron reacting with oxygen gas in th...
- Sun Feb 28, 2021 7:43 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling week 7/8 #5
- Replies: 7
- Views: 955
Re: Sapling week 7/8 #5
kentbui1d wrote:I put the same thing as you, but I got it correct. That's weird
[Pb(OH)4]2-(aq) + ClO-(aq) ---> PbO2(s) + Cl-(aq) + H2O(l) + 2OH-(aq)
Yeah I just realized I had typed it in wrong, but had it correct on paper !
- Sun Feb 28, 2021 7:39 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling week 7/8 #5
- Replies: 7
- Views: 955
Re: Sapling week 7/8 #5
Astha Patel 2J wrote:I had the same question as you and I got the same answer and it was correct. Maybe try rearranging the order of the products, because my products were listed PbO2 + Cl- + H2O + 2OH-
Thank you so much! I just realized I had written down H2O, but forgot to add it into my answer on Sapling.
- Sun Feb 28, 2021 7:35 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling week 7/8 #5
- Replies: 7
- Views: 955
Re: Sapling week 7/8 #5
Hayden Lee 1C wrote:It seems that you balanced the reaction correctly. Did you include the correct phases of each species? This is required in the problem and it may be the reason why you aren't getting it right.
Yeah, I put ClO-(aq) + [Pb(OH)4]2-(aq) --> Cl-(aq) + PbO2(s) + 2OH-(aq), but it's still wrong
- Sun Feb 28, 2021 7:27 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling week 7/8 #5
- Replies: 7
- Views: 955
Sapling week 7/8 #5
Could someone help me with balancing this redox equation: [Pb(OH)4]-2(aq) +ClO−(aq) ⟶ PbO2(s)+Cl−(aq) (basic solution) 'm having trouble balancing this equation and determining the amount of electrons needed to be added. I got [Pb(OH)4]2- + ClO- --> PbO2 + H2O +2OH- +Cl-, but I'm not sure why this i...
- Sun Feb 28, 2021 2:43 am
- Forum: Balancing Redox Reactions
- Topic: sapling week 7/8 #4
- Replies: 2
- Views: 168
sapling week 7/8 #4
I'm a bit confused on how to begin balancing this redox equation: Au(s) + HNO3(aq) +HCl(aq) --> HAuCl4(aq) + NO2(g) +H2O(l).
I am assuming the oxidation half reaction is Au(s) --> HAuCl4(aq), but what would the reduction half reaction be?
I am assuming the oxidation half reaction is Au(s) --> HAuCl4(aq), but what would the reduction half reaction be?
- Sun Feb 28, 2021 1:56 am
- Forum: Balancing Redox Reactions
- Topic: Determining which molecule is the oxidizing agent
- Replies: 49
- Views: 2175
Re: Determining which molecule is the oxidizing agent
Yup, the oxidizing agent is the one that has been reduced, and vice versa.
- Sat Feb 27, 2021 4:08 am
- Forum: Balancing Redox Reactions
- Topic: Adding OH-
- Replies: 5
- Views: 425
Adding OH-
How do we know when we need to add OH- when balancing redox equations?
- Fri Feb 26, 2021 7:17 am
- Forum: Student Social/Study Group
- Topic: Anxiety
- Replies: 109
- Views: 10441
Re: Anxiety
I like to plan out the things I have to do each day so that I won't get too overwhelmed by all my assignments and end up forgetting to do important things. It is also nice to check off what you've finished. I would suggest cleaning your work area, switching your work environment once in a while, and...
- Fri Feb 19, 2021 4:57 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Calculating degeneracy
- Replies: 18
- Views: 3649
Re: Calculating degeneracy
W=(# of possible states)^(# of particles). For example, 64 molecules all aligned in the same direction would have a degeneracy of 1^64.
- Thu Feb 18, 2021 11:07 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2 and Final
- Replies: 25
- Views: 1488
Re: Midterm 2 and Final
Midterm 2 will be proctored the same way Midterm 1 was proctored. I'm assuming the final will be proctored in a similar way, since that's how it was for 14A.
- Thu Feb 18, 2021 9:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm/Textbook question
- Replies: 5
- Views: 252
Re: Midterm/Textbook question
They are pretty difficult, I'd have to agree. There is a possibility that the focus problems will be used though, because they are part of the assigned textbook problems :o
- Thu Feb 18, 2021 1:09 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2
- Replies: 11
- Views: 834
Re: Midterm 2
Yes, it probably will! The Van't Hoff equation relates the temperature dependence of the equilibrium constant to the enthalpy change of a process
- Tue Feb 16, 2021 4:24 am
- Forum: Calculating Work of Expansion
- Topic: Expansion Work
- Replies: 2
- Views: 200
Expansion Work
Can we tell whether expansion work is being done by a reaction based on the number of moles of gas in a reaction equation?
- Sat Feb 13, 2021 8:50 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Sapling Week 5/6 #8
- Replies: 6
- Views: 307
Re: Sapling Week 5/6 #8
Thank you!!!
- Sat Feb 13, 2021 7:18 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Sapling Week 5/6 #8
- Replies: 6
- Views: 307
Re: Sapling Week 5/6 #8
You would have to first calculate the change in entropy for heating the water from 58 to 100 degrees. Then you would add this value to the entropy from 100 to 100 degrees which is given to you. The vapor is then cooled back down so calculate the change in entropy from 100 back to 58 degrees. To cal...
- Sat Feb 13, 2021 6:59 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Sapling Week 5/6 #8
- Replies: 6
- Views: 307
Sapling Week 5/6 #8
Hi, I'm a bit confused on this question: Calculate the standard molar entropy of vaporization of water at 58.0 °C , given that its standard molar entropy of vaporization at 100.0 °C is 109.0 J⋅K−1⋅mol−1 and the molar heat capacities at constant pressure for liquid water and water vapor are 75.3 J⋅K−...
- Sat Feb 13, 2021 1:44 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Sapling Week 5/6 #4
- Replies: 8
- Views: 418
Re: Sapling Week 5/6 #4
Thank you!
- Sat Feb 13, 2021 12:39 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Sapling Week 5/6 #4
- Replies: 8
- Views: 418
Sapling Week 5/6 #4
This question states: Consider a process in which an ideal gas is compressed to one-fifth of its original volume at constant temperature. Calculate the entropy change per mole of gas. I know that the equation that we can use is delta S = nRln (V2/V1), but I'm not sure how to solve it if we are not g...
- Fri Feb 12, 2021 11:08 pm
- Forum: Student Social/Study Group
- Topic: Studying for Midterm 2
- Replies: 45
- Views: 2384
Re: Studying for Midterm 2
I would recommend attending UA sessions, working on textbook problems, and watching review videos on Youtube! If you can't make it to the UA sessions, some of the worksheets can be found on chem community & most of them are posted in the Google folder that someone has created for this class. I'm...
- Fri Feb 12, 2021 5:09 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Residual entropy
- Replies: 4
- Views: 621
Residual entropy
If given NO, N2O, CO2, and Cl2, how do you tell which compounds would be most likely to have a residual entropy in their crystalline forms at T=0 K?
- Thu Feb 11, 2021 3:57 am
- Forum: Student Social/Study Group
- Topic: Points needed to pass?
- Replies: 76
- Views: 11484
Re: Points needed to pass?
I'm pretty sure we can miss 200 points to pass with a C-, since 50% is a C- in this class. I am assuming 320/400 points would be the minimum for a B-, since that is 80%, but feel free to correct me if I'm wrong.
- Fri Feb 05, 2021 5:41 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Sapling Week 3-4 #19
- Replies: 3
- Views: 157
Re: Sapling Week 3-4 #19
Thank you!!
- Fri Feb 05, 2021 2:26 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Sapling Week 3-4 #19
- Replies: 3
- Views: 157
Sapling Week 3-4 #19
Hi, I'm not sure how to begin solving this question. How should I set up the equations? A constant‑volume calorimeter was calibrated by carrying out a reaction known to release 0.882 kJ of heat in 0.700 L of solution in the calorimeter (q=−0.882 kJ) , resulting in a temperature rise of 2.43 ∘C . In ...
- Fri Feb 05, 2021 12:59 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Sapling HW Weeks 3&4 #18
- Replies: 3
- Views: 110
Re: Sapling HW Weeks 3&4 #18
Oh I didn't know about the Cv=Cp-R equation! Thank you :D
- Thu Feb 04, 2021 10:25 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Sapling HW Weeks 3&4 #18
- Replies: 3
- Views: 110
Sapling HW Weeks 3&4 #18
A 0.305 mol sample of CO2(g), initially at 298 K and 1.00 atm, is held at constant pressure while enough heat is applied to raise the temperature of the gas by 12.3 K. Calculate the amount of heat q required to bring about this temperature change, and find the corresponding total change in the inter...
- Thu Feb 04, 2021 5:31 pm
- Forum: Phase Changes & Related Calculations
- Topic: Sapling HW Weeks 3&4 #10
- Replies: 6
- Views: 261
Re: Sapling HW Weeks 3&4 #10
Thank you! Turns out I had a calculation error!
- Thu Feb 04, 2021 2:56 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Confused about equations
- Replies: 6
- Views: 383
Re: Confused about equations
You and me both! Thermochem is definitely one of the harder topics, and it's tougher since this is midterm season. I am still confused as well, but I am hoping that watching more videos on the topics on YouTube and working on more practice problems would help. Don't worry, you're not alone :,)
- Thu Feb 04, 2021 2:14 am
- Forum: Phase Changes & Related Calculations
- Topic: Sapling HW Weeks 3&4 #10
- Replies: 6
- Views: 261
Sapling HW Weeks 3&4 #10
Hi, I'm a bit confused on this question: An ice cube with a mass of 46.4 g at 0.0 degrees C is added to a glass containing 365 g of water at 45.0 degrees C . Determine the final temperature of the system at equilibrium. The specific heat capacity of water, Cs , is 4.184 J/g⋅C , and the standard enth...
- Thu Jan 28, 2021 8:24 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Water as a Reactant
- Replies: 9
- Views: 466
Re: Water as a Reactant
Yes I'm pretty sure we would assume H2O is in liquid form unless stated otherwise. We would not include water in the equilibrium constant equation.
- Thu Jan 28, 2021 8:21 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpies
- Replies: 2
- Views: 137
Re: Enthalpies
Yeah, I'm pretty sure we'll be given the enthalpies.
- Thu Jan 28, 2021 8:19 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Calculating Enthalpy of Reactions
- Replies: 2
- Views: 113
Calculating Enthalpy of Reactions
I noticed that when calculating enthalpy, sometimes we do enthalpy of formation of products minus that of reactants. There is also "bonds broken minus bonds formed." Would we only do products-reactants when given enthalpies of formation?
- Thu Jan 28, 2021 8:01 pm
- Forum: Phase Changes & Related Calculations
- Topic: reaction shifts
- Replies: 18
- Views: 876
Re: reaction shifts
^ I agree, it's important to determine whether heat is a reactant or product first. Increasing temperature would increase the amount of heat, and decreasing temperature would decrease the amount of heat. After determining whether you have gained/decreased the amount of product/reactant, you can then...
- Mon Jan 25, 2021 8:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Are all the UA workshops/step up session the same?
- Replies: 6
- Views: 402
Re: Are all the UA workshops/step up session the same?
I do find it helpful to attend more than one a week just because I feel like each UA has a different style of explaining certain concepts. They are all helpful and go over similar practice problems, but I like to stick to the workshops that fit my learning style most (like someone previously said). ...
- Sat Jan 23, 2021 6:04 am
- Forum: General Science Questions
- Topic: ka/kb values
- Replies: 2
- Views: 158
Re: ka/kb values
Hi! I feel like we aren't expected to memorize any Ka/Kb values, because they'll most likely be given to us. In some cases, they may not, but this may be because we won't need it to solve the problem.
- Sat Jan 23, 2021 5:59 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling HW #5
- Replies: 3
- Views: 235
Re: Sapling HW #5
thank u guys !
- Thu Jan 21, 2021 5:20 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Percent protonated vs percent ionization
- Replies: 6
- Views: 309
Percent protonated vs percent ionization
Is there a difference in calculation between a question that asks for percentage protonated and one that asks for percent ionization?
- Thu Jan 21, 2021 1:08 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling HW #5
- Replies: 3
- Views: 235
Sapling HW #5
Hi, I've been trying to solve this question, but I'm not sure if I keep getting calculation errors or if I am completely missing the question: The Kb for an amine is 7.384×10−5. What percentage of the amine is protonated if the pH of a solution of the amine is 9.149 ? Assume that all OH− came from t...
- Tue Jan 19, 2021 9:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Exams
- Replies: 7
- Views: 403
Re: Midterm Exams
It will be very similar in format to last years midterms. The only major difference is that it won't be during your discussion time, meaning that everyone is taking the midterm at the same time. So, midterms will be held during our lecture times? Yes, I believe midterms will be held on the Friday o...
- Tue Jan 19, 2021 9:07 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: percent ionization
- Replies: 6
- Views: 279
Re: percent ionization
I do not think percent ionization is Ka as a percent. It is the concentration of de-protonated species over the initial concentration of the original acid times 100%. ( [A-]/[HA]initial ) * 100%
- Sat Jan 16, 2021 3:58 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Memorizing relationship of Q and K
- Replies: 9
- Views: 517
Re: Memorizing relationship of Q and K
I remember in a workshop with Michael, he mentioned that there is a trick:
if K>Q, the reaction proceeds right, since the arrow is pointing to the right,
and if K<Q, the reaction proceeds left, since the arrow is pointing to the left.
This trick only works if K is written before the Q.
if K>Q, the reaction proceeds right, since the arrow is pointing to the right,
and if K<Q, the reaction proceeds left, since the arrow is pointing to the left.
This trick only works if K is written before the Q.
- Fri Jan 15, 2021 2:12 am
- Forum: Student Social/Study Group
- Topic: Study Habits
- Replies: 96
- Views: 8851
Re: Study Habits
Hi! I would definitely recommend going to at least 1 UA session per week. If that is not possible, I would say to work on the worksheets that they send out for practice. Working on textbook problems and Sapling seem to be very helpful as well. I did not really touch the textbook problems last quarte...
- Fri Jan 15, 2021 2:12 am
- Forum: Student Social/Study Group
- Topic: Study Habits
- Replies: 96
- Views: 8851
Re: Study Habits
Hi! I would definitely recommend going to at least 1 UA session per week. If that is not possible, I would say to work on the worksheets that they send out for practice. Working on textbook problems and Sapling seem to be very helpful as well. I did not really touch the textbook problems last quarte...
- Thu Jan 14, 2021 2:52 am
- Forum: Ideal Gases
- Topic: n/V = concentration
- Replies: 19
- Views: 2624
Re: n/V = concentration
concentration is mol/liters, and n represents the number of moles and V represents volume, which can be measured in liters
- Wed Jan 13, 2021 1:52 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: K in endo and exo when temp. decreases
- Replies: 11
- Views: 606
Re: K in endo and exo when temp. decreases
I believe the above reply is correct. Decreasing temperature would increase the K value for exothermic reactions decrease the K value for endothermic reactions.
- Tue Jan 12, 2021 3:46 am
- Forum: Student Social/Study Group
- Topic: Comfort Movies
- Replies: 168
- Views: 43790
Re: Comfort Movies
I like childhood movies and shows like Wizards of Waverly Place, Victorious, etc. & I love coming of age movies (Perks of Being a Wallflower, Lady Bird, etc.) like a few others who replied as well!! Lmk if anyone has recommendations :-)
- Sat Jan 09, 2021 1:58 am
- Forum: Ideal Gases
- Topic: Gas constant R
- Replies: 26
- Views: 1431
Re: Gas constant R
it would be on the constant sheet :-)
- Fri Jan 08, 2021 1:27 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling HW Week 1 #5
- Replies: 2
- Views: 170
Sapling HW Week 1 #5
hi can someone explain the steps to solve this? i keep getting it wrong Consider the reaction of NH3 and I2 to give N2 and HI. 2NH3(g)+3I2(g)↽−−⇀N2(g)+6HI(g) ; K Using two or more of the given equations, determine the equilibrium constant, K , for the reaction of NH3 with I2. H2(g)+I2(g)↽−−⇀2HI(g) ;...
- Thu Jan 07, 2021 4:01 am
- Forum: Student Social/Study Group
- Topic: Learning Sessions
- Replies: 24
- Views: 1411
Re: Learning Sessions
It depends on how well you understand the material for that week! I find them very helpful, so I would try to attend at least 1-2 per week!
- Wed Jan 06, 2021 2:03 am
- Forum: Administrative Questions and Class Announcements
- Topic: Username for Chem Community
- Replies: 4
- Views: 297
Re: Username for Chem Community
All your posts will still be under the account you are currently using, so as long as you have 5 posts per week, you should be fine!
- Tue Jan 05, 2021 2:24 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Qc vs Kc
- Replies: 15
- Views: 5530
Re: Qc vs Kc
If Q < K, the forward reaction is favored. If Q > K, the reverse reaction is favored.
- Tue Dec 15, 2020 10:59 pm
- Forum: General Science Questions
- Topic: Passing Grade
- Replies: 34
- Views: 2470
Re: Passing Grade
I thought the same thing as you did, but I am pretty sure that it means that you need 50% overall to pass.
- Tue Dec 15, 2020 3:15 am
- Forum: Student Social/Study Group
- Topic: Final Exam
- Replies: 49
- Views: 3218
Re: Final Exam
I definitely felt super rushed, but I'm glad we are receiving extra 10 bonus points, because I really needed that.
- Thu Dec 10, 2020 11:16 pm
- Forum: Student Social/Study Group
- Topic: Anxiety
- Replies: 109
- Views: 10441
Re: Anxiety
I like to listen to mellow music while I study! I also like to remind myself that it'll be over with soon, and since the final is early on in the week, I'll have time to study for other classes throughout the week without worrying about chem
- Thu Dec 10, 2020 7:43 am
- Forum: Student Social/Study Group
- Topic: PUSH THROUGH!!
- Replies: 31
- Views: 2027
Re: PUSH THROUGH!!
thank you! good luck to you too ! :-)
- Tue Dec 08, 2020 9:05 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strength of Acids
- Replies: 8
- Views: 938
Strength of Acids
The bigger an anion in an acid, the stronger the acid is, right? For #11 on the week 10 Sapling homework, the acids given were HClO, HBrO, and HIO. It asked to list the acids from most acidic to least acidic. How come they considered the electronegativity of Cl, Br, and I instead of considering the ...
- Mon Dec 07, 2020 7:13 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Sapling Week 10 Question 7
- Replies: 1
- Views: 181
Sapling Week 10 Question 7
In general, how would I be able to easily determine which salts are acidic, basic, or neutral? The salts given in this question are K3PO4, NaCN, LiNO3, NH4ClO4, and KCl.
- Sun Dec 06, 2020 5:55 pm
- Forum: Naming
- Topic: Helpful Videos for Naming
- Replies: 22
- Views: 1340
Re: Helpful Videos for Naming
Thank you! The Organic Chemistry Tutor is definitely my go-to!
- Sat Dec 05, 2020 9:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 21
- Views: 991
Re: Final
It is most likely that the final will be very similar to the midterms. I believe it is zoom proctored and we would still need a second device to show our set-up.
- Thu Dec 03, 2020 8:30 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Compound
- Replies: 6
- Views: 329
Re: Coordination Compound
that looks good to me
- Wed Dec 02, 2020 5:45 am
- Forum: Student Social/Study Group
- Topic: Happy Thanksgiving!
- Replies: 39
- Views: 2480
Re: Happy Thanksgiving!
My family usually just eats a big dinner together, but most years, my dad would make carbonated fruit punch with orange slices in it! We didn't do that this year, but we still ate dinner together so that was nice.
- Wed Dec 02, 2020 5:41 am
- Forum: Student Social/Study Group
- Topic: Big Sad: Midterm 2
- Replies: 86
- Views: 9270
Re: Big Sad: Midterm 2
Midterm 2 was a bit more difficult for me compared to the first one we took. It does make me nervous thinking about my final grade as well, but it's important to not let past exams discourage us from putting in our best effort when it's time for finals!
- Tue Dec 01, 2020 5:47 am
- Forum: Naming
- Topic: Order of Molecules
- Replies: 6
- Views: 418
Re: Order of Molecules
I also believe the order of the ligands do not matter as long as they come after the cation!
- Sat Nov 28, 2020 7:02 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Coplanar
- Replies: 3
- Views: 252
Re: Coplanar
thank u!
- Sat Nov 28, 2020 6:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 14B vs 14A
- Replies: 12
- Views: 798
Re: 14B vs 14A
I am pretty sure we are using the same book and Sapling for 14B. For the class itself, I'm not sure if it will be asynchronous like right now or not.
- Thu Nov 26, 2020 11:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Coplanar
- Replies: 3
- Views: 252
Coplanar
How do determine whether or not atoms of certain structures lie in the same plane? Question #18 on the Sapling homework from weeks 7 & 8 asked about the orientation of hydrogen atoms, but I'm not sure how to tell if the atoms are coplanar.
- Thu Nov 26, 2020 8:55 pm
- Forum: Hybridization
- Topic: Sp3d or dsp3
- Replies: 22
- Views: 2296
Re: Sp3d or dsp3
I would personally use sp3d, but like everyone has stated, it doesn't really matter which one you decide to use!
- Tue Nov 24, 2020 9:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Ways to remember VSEPR
- Replies: 6
- Views: 267
Re: Ways to remember VSEPR
I used to pronounce it like "vesper," but that made me misspell it every time I wrote it in my notes. Now, I just read the letters "V-S-E-P-R" out loud whenever I write it down, and eventually, it just began rolling off the tip of my tongue. I think if you keep reading it out lou...
- Tue Nov 24, 2020 3:54 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sampling Week 7/8 #6
- Replies: 6
- Views: 402
Re: Sampling Week 7/8 #6
Since there are 2 bonded groups and 2 lone pairs on Sulfur, there are 4 regions of electron density. This means that the molecule forms a tetrahedral shape with bonded groups at 109.5 degrees, which is not linear.
- Sun Nov 22, 2020 1:24 am
- Forum: Hybridization
- Topic: Determining Hybridization
- Replies: 4
- Views: 478
Determining Hybridization
What are the steps to determine the hybridization of an element in a molecule/ion/etc.? I'm not sure what to consider when looking at the Lewis structures.
- Fri Nov 20, 2020 6:46 pm
- Forum: Student Social/Study Group
- Topic: Study Tips for Final Exam
- Replies: 57
- Views: 3553
Re: Study Tips for Final Exam
Hey girl! I would say attending workshop sessions is super helpful for me, but it can be hard because everyone has different schedules. I think I am going to study by doing practice problems from the textbooks, worksheets from the UA sessions, going over my notes (and maybe re-write the important co...
- Thu Nov 19, 2020 10:13 pm
- Forum: Bond Lengths & Energies
- Topic: Boiling/Melting Point
- Replies: 29
- Views: 1451
Re: Boiling/Melting Point
We would look at the intermolecular forces!
Intermolecular: between molecules
Intramolecular: within molecules
Intermolecular: between molecules
Intramolecular: within molecules
- Tue Nov 17, 2020 11:36 pm
- Forum: Student Social/Study Group
- Topic: Midterm 2
- Replies: 19
- Views: 1156
Re: Midterm 2
I watched a lot of Youtube videos on topics that I wasn't too strong on! I like to watch the Organic Chemistry Tutor on Youtube. I also read over all my notes, looked over the outlines, and did questions from the UA sessions.
- Tue Nov 17, 2020 2:55 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Textbook Problem 1E.25 d
- Replies: 2
- Views: 121
Re: Textbook Problem 1E.25 d
I remember Dr. Lavelle mentioning the Cu is an exception, so it would be written like that. I'm assuming Au and Ag are exceptions as well.
- Tue Nov 17, 2020 4:23 am
- Forum: Student Social/Study Group
- Topic: grade worries
- Replies: 119
- Views: 26427
Re: grade worries
Yes, I'm also thinking about my final grade and the upcoming midterm and final exam. It does make me a bit nervous when I think about the amount of points that I can miss to keep a certain grade. Just be sure to do the Sapling homework and get those Chemistry Community points, because every point is...
- Sun Nov 15, 2020 8:04 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 3d and 4s orbitals
- Replies: 4
- Views: 1303
3d and 4s orbitals
When writing the electron configurations, when do you put 3d before 4s? Do you usually just do this for transition elements? & When I searched up the e-configuration for Bromine (Br), it says it's [Ar] 4s² 3d¹⁰ 4p⁵, and the e-configuration for Selenium (Se) is [Ar] 3d10 4s2 4p4, so I'm a bit con...
- Sat Nov 14, 2020 4:14 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Order of Intermolecular Forces
- Replies: 5
- Views: 428
Re: Order of Intermolecular Forces
Ohh I didn't realize dipole-induced dipole was the same as London dispersion forces! Thank you!
- Sat Nov 14, 2020 1:30 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Order of Intermolecular Forces
- Replies: 5
- Views: 428
Order of Intermolecular Forces
What is the order of all interionic/intermolecular forces from weakest to strongest? & What is the difference between dipole-dipole and dipole-induced dipole interactions?
- Thu Nov 12, 2020 6:50 am
- Forum: Resonance Structures
- Topic: Sapling HW Weeks 5,6 Question #4
- Replies: 9
- Views: 1162
Re: Sapling HW Weeks 5,6 Question #4
thank you!
- Wed Nov 11, 2020 4:45 am
- Forum: General Science Questions
- Topic: Which would have lower ionization energy?
- Replies: 13
- Views: 837
Re: Which would have lower ionization energy?
I think Cl would have a lower ionization energy , since chlorine is one period below oxygen and would have valence electrons that aren't bounded as tightly as those of oxygen.
- Wed Nov 11, 2020 2:55 am
- Forum: Resonance Structures
- Topic: Sapling HW Weeks 5,6 Question #4
- Replies: 9
- Views: 1162
Sapling HW Weeks 5,6 Question #4
This question shows the Lewis structure of a carbamate ion, and it asks us to the 2 other major resonance structures. I was able to correctly draw the one with a double bond between N and C (N=C), but I keep getting the other resonance structure with a single bond between N and C wrong. Can someone ...
- Tue Nov 10, 2020 11:36 am
- Forum: Coordinate Covalent Bonds
- Topic: Sapling#6
- Replies: 2
- Views: 152
Re: Sapling#6
I read that nonmetal oxides are usually Lewis acids, and SO2 is a nonmetal oxide, so it would be a Lewis acid. I am not too sure why though.
- Sat Nov 07, 2020 5:54 pm
- Forum: Lewis Structures
- Topic: Lewis Base (NH3)
- Replies: 3
- Views: 257
Re: Lewis Base (NH3)
I'm not sure about your second question, but I know that NH3 is a Lewis base, it has a lone pair that can be donated to a Lewis acid to form a a coordinate covalent bond. It is easier to see if you draw out the Lew structure for NH3. Lewis bases are lone pair donors, while Lewis acids are lone pair ...
- Fri Nov 06, 2020 8:04 pm
- Forum: Ionic & Covalent Bonds
- Topic: Homework due date
- Replies: 49
- Views: 2702
Re: Homework due date
^ yup it would be 11:59 pm on Sunday!
- Wed Nov 04, 2020 11:18 pm
- Forum: Lewis Structures
- Topic: First 3 elements' octet
- Replies: 4
- Views: 190
Re: First 3 elements' octet
I know that helium only has room for two electrons in its only valence shell, and it is stable (it's a noble gas), so it doesn't follow the octet rule
- Tue Nov 03, 2020 7:18 pm
- Forum: Trends in The Periodic Table
- Topic: Why is the ionization energy of O lower than N?
- Replies: 13
- Views: 1844
Re: Why is the ionization energy of O lower than N?
From what I've read online, this is because an electron being added to an already half full orbital in oxygen results in electron-electron repulsion, which lowers the ionization energy. Nitrogen also has the added stability of a half filled shell of electrons in the 2p shell, which probably contribu...