Search found 111 matches
- Tue Mar 16, 2021 2:18 am
- Forum: Student Social/Study Group
- Topic: Fav Shows of the Moment
- Replies: 115
- Views: 26388
Re: Fav Shows of the Moment
Just finished Bridgerton.
- Tue Mar 16, 2021 2:10 am
- Forum: Student Social/Study Group
- Topic: Points needed to pass?
- Replies: 76
- Views: 6630
Re: Points needed to pass?
You need a 50% to pass with a C-, which is equal to 200/400 points.
- Tue Mar 16, 2021 2:08 am
- Forum: Student Social/Study Group
- Topic: Points Required for Full Credit of Chem Community
- Replies: 11
- Views: 842
Re: Points Required for Full Credit of Chem Community
I think if you have 50 points you should be fine. This is for those who missed a couple of points during the quarter.
- Tue Mar 16, 2021 2:00 am
- Forum: General Rate Laws
- Topic: Units for k
- Replies: 11
- Views: 695
Re: Units for k
You can memorize or calculate it.
Rate = k a to a power. So Zero is m/s. One is 1/s and second is 1/sm.
Rate = k a to a power. So Zero is m/s. One is 1/s and second is 1/sm.
- Sun Mar 14, 2021 6:43 pm
- Forum: First Order Reactions
- Topic: Order of Reactions
- Replies: 11
- Views: 589
Re: Order of Reactions
To get the overall order of the reactions, you need to add the orders together.
- Sun Mar 14, 2021 6:42 pm
- Forum: Second Order Reactions
- Topic: Determining slow step
- Replies: 22
- Views: 1086
Re: Determining slow step
The slow step should have the highest activation energy.
You would also find the products of the slow step in the final reaction.
You would also find the products of the slow step in the final reaction.
- Sun Mar 14, 2021 6:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: THANK YOU DR LAVELLE!
- Replies: 47
- Views: 6256
Re: THANK YOU DR LAVELLE!
Thank you so much for all the help!!
- Thu Mar 11, 2021 9:39 am
- Forum: General Rate Laws
- Topic: Rate determining step
- Replies: 38
- Views: 1408
Re: Rate determining step
The reaction is not complete until that slow step is fulfilled. Therefore the slow step determines the rate of the whole reaction.
- Thu Mar 11, 2021 9:37 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: What was your favorite chem topic?
- Replies: 137
- Views: 8545
Re: What was your favorite chem topic?
Personally, I enjoyed Chemical equilibrium.
- Thu Mar 11, 2021 9:35 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Units for Activation Energy
- Replies: 28
- Views: 1851
Re: Units for Activation Energy
J/mol or kJ/mol
- Fri Mar 05, 2021 8:12 pm
- Forum: General Rate Laws
- Topic: Number of Reactants
- Replies: 26
- Views: 1031
Re: Number of Reactants
It is possible for there to be more than 3 reactant, however, I doubt Dr. Lavelle would address these instances in class.
- Fri Mar 05, 2021 8:08 pm
- Forum: Balancing Redox Reactions
- Topic: states of matter
- Replies: 58
- Views: 2113
Re: states of matter
Yes, unless the question says that phases are optional.
Usually you should just include the states of matter.
Usually you should just include the states of matter.
- Fri Mar 05, 2021 8:06 pm
- Forum: Zero Order Reactions
- Topic: First, Second and Zero Order Reactions
- Replies: 2
- Views: 177
Re: First, Second and Zero Order Reactions
Example of zero reaction - Photochemical reaction between hydrogen and chlorine.
Example of first reaction - the hydrolysis of aspirin.
Example of second reaction - basic hydrolysis of an ester.
Example of first reaction - the hydrolysis of aspirin.
Example of second reaction - basic hydrolysis of an ester.
- Fri Mar 05, 2021 8:02 pm
- Forum: First Order Reactions
- Topic: Slope
- Replies: 24
- Views: 836
Re: Slope
In first and zero order reactions, the slope is -k.
In second order reactions, the slope is +k
In second order reactions, the slope is +k
- Fri Mar 05, 2021 8:01 pm
- Forum: General Rate Laws
- Topic: Half-life Reactions
- Replies: 3
- Views: 224
Re: Half-life Reactions
Most of the time they ask about half-life in relation to the order reactions. For example, they can just give you a description for you to calculate half-life on its own, or ask what order a reaction is based on its half-life.
- Sun Feb 28, 2021 7:38 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
What do you do when a chemist dies?
You Barium.
You Barium.
- Sun Feb 28, 2021 7:18 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation Numbers
- Replies: 30
- Views: 1226
Re: Oxidation Numbers
You dont need to memorize any of them but with practice you kind of start to remember them automatically. It isnt difficult to understand how it works, making it easier to memorize.
- Sun Feb 28, 2021 7:06 pm
- Forum: Balancing Redox Reactions
- Topic: Determining which molecule is the oxidizing agent
- Replies: 49
- Views: 1753
Re: Determining which molecule is the oxidizing agent
The oxidizing agent is being reduced and the reducing agent is being oxidized. To remember, its the opposite.
- Sun Feb 28, 2021 6:58 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt Bridges
- Replies: 41
- Views: 2921
Re: Salt Bridges
A salt bridge is a laboratory device used to connect the oxidation and reduction half-cells of a galvanic cell, a type of electrochemical cell. It maintains electrical neutrality within the internal circuit.
- Sun Feb 28, 2021 6:55 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode/Cathode
- Replies: 45
- Views: 1425
Re: Anode/Cathode
The anode is always on the left and the cathode is always on the right.
- Thu Feb 25, 2021 1:30 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: E cell vs Ecell naught
- Replies: 25
- Views: 1575
Re: E cell vs Ecell naught
E cell naught is the cell potential at standard conditions while E cell can be at any random conditions.
The equation that shows the realtionship between the two is:
E cell = E cell naught - (RT/nF)lnQ
The equation that shows the realtionship between the two is:
E cell = E cell naught - (RT/nF)lnQ
- Sun Feb 21, 2021 11:52 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
Do you have 11 protons?
Cause you sodium fine!!
Cause you sodium fine!!
- Sun Feb 21, 2021 11:48 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: fun way to remember anode and cathode
- Replies: 16
- Views: 2561
Re: fun way to remember anode and cathode
Thank you so much for sharing this, it will help me a lot. I always confuse the two.
- Sun Feb 21, 2021 11:45 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Solids and Liquids?
- Replies: 26
- Views: 1298
Re: Solids and Liquids?
Le Chatelier's Principle only applies to gases. However this does not affect the solid and pure liquid systems since their active masses are always taken as unity.
- Sun Feb 21, 2021 11:42 pm
- Forum: Student Social/Study Group
- Topic: We made it through Midterm 2!
- Replies: 71
- Views: 3500
Re: We made it through Midterm 2!
Congratulations to everyone!! We only have a few more weeks left.
- Sun Feb 21, 2021 11:38 pm
- Forum: Student Social/Study Group
- Topic: Points needed to pass?
- Replies: 76
- Views: 6630
Re: Points needed to pass?
You need to get atleast 50% in the class to get a C- and pass the class. If not, then you will need to repeat the class. That is 200/400 points
- Sun Feb 14, 2021 9:21 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
Why is the pH of Youtube so stable?
Because it constantly buffers.
Because it constantly buffers.
- Sun Feb 14, 2021 8:47 pm
- Forum: Student Social/Study Group
- Topic: Spring 2021
- Replies: 106
- Views: 11954
Re: Spring 2021
I am not sure if I should take chem14BL and chem14C or only chem14BL. I do not know if the workload will be too much.
- Sun Feb 14, 2021 8:29 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Sapling #5
- Replies: 9
- Views: 444
Re: Sapling #5
In order to get the right answer with the right units, convert kPa to atm. It makes it easier.
- Sun Feb 14, 2021 8:27 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: difference in ΔG and ΔG⁰
- Replies: 15
- Views: 652
Re: difference in ΔG and ΔG⁰
ΔG⁰ refers to free energy in standard states, whereas ΔG refers to free energy in any state.
- Sun Feb 14, 2021 8:25 pm
- Forum: Administrative Questions and Class Announcements
- Topic: struggling
- Replies: 73
- Views: 3497
Re: struggling
I think you are panicking when you study because of your midterm grade.You need to relax when doing this type of work. Use your tectbook and go througheach topic at your own pace, and answer the questions that come after. If you get stuck on anything, use chemistry community. The UA sessions help a ...
- Sun Feb 07, 2021 9:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: tips if you're struggling!
- Replies: 77
- Views: 4385
Re: tips if you're struggling!
These tips are so helpful! I think it is important to practice these techniques to improve our learning methods.
- Sun Feb 07, 2021 9:03 pm
- Forum: Ideal Gases
- Topic: Gas Constant Value
- Replies: 43
- Views: 1420
Re: Gas Constant Value
The units usually depend on the problem being solved, and the other units given in the question. The units are usually given on the exam sheet, so we just need to know how to apply everything.
- Sun Feb 07, 2021 7:57 pm
- Forum: Phase Changes & Related Calculations
- Topic: Vapor vs gas
- Replies: 121
- Views: 8902
Re: Vapor vs gas
I thought it was the same thing, and I am assumung that we do not need to know the difference between the two for the class. However I found that vapour phase consists of a phase with two different substances at room temperature, whereas a gas phase consists of a single substance at a defined thermo...
- Sun Feb 07, 2021 7:48 pm
- Forum: Student Social/Study Group
- Topic: Study routine.
- Replies: 51
- Views: 2286
Re: Study routine.
I think the textbook helps a lot if you study each topic and do the recommended questions that come with it. Doing the homework Sapling questions also work well to make you understand the syllabus better. Lavelle's lectures are extremely helpful, therefore I would just recommend making short notes f...
- Sun Feb 07, 2021 7:43 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
A neutron walks into a bar. He asks the bartender, "How much for a beer?"
Bartender gives a smile and says, "for you, no charge!"
Bartender gives a smile and says, "for you, no charge!"
- Sun Jan 31, 2021 12:01 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
Are you full of beryllium, gold, and titanium?
-> Because you are Be-Au-Ti-full
-> Because you are Be-Au-Ti-full
- Sun Jan 31, 2021 12:00 pm
- Forum: Phase Changes & Related Calculations
- Topic: Define Phase Change
- Replies: 78
- Views: 4902
Re: Define Phase Change
A phase change is when the state of matter of an substance changes between solid, liquid, or gas.
- Sun Jan 31, 2021 11:59 am
- Forum: Phase Changes & Related Calculations
- Topic: Endothermic v. Exothermic
- Replies: 139
- Views: 10177
Re: Endothermic v. Exothermic
Exothermic reactions will always be negative because the total energy of the products is less than that of the reactants which is why energy gets released.
- Sun Jan 31, 2021 11:58 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Effect of Kelvin Instead of Celsius
- Replies: 12
- Views: 625
Re: Effect of Kelvin Instead of Celsius
The calculations involve delta T, you do not convert the temperature units as Kelvin and Celsius have the same increments between each unit of measure.
- Sun Jan 31, 2021 11:57 am
- Forum: Ideal Gases
- Topic: Reversing Reactions
- Replies: 68
- Views: 2238
Reversing Reactions
What happens to K when you reverse a reaction?
- Sun Jan 24, 2021 6:32 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE Tables
- Replies: 36
- Views: 1591
Re: ICE Tables
X stands for the C row - the change in equilibrium. This figure will be multiplied by the stoichiometric coefficient. This is all found in the ICE table.
- Sun Jan 24, 2021 6:28 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Determining pH
- Replies: 18
- Views: 761
Re: Determining pH
Taking the -log[H+] will give you the pH. After finding the pH, subtract the number from 14 to give you pOH.
pH + pOH = 14
pH + pOH = 14
- Sun Jan 24, 2021 5:22 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
What do you call an acid with an attitude?
-> A-mean-oh acid
-> A-mean-oh acid
- Sun Jan 24, 2021 5:13 am
- Forum: Ideal Gases
- Topic: Week 3/4 Sapling no. 18
- Replies: 3
- Views: 186
Re: Week 3/4 Sapling no. 18
Thank you so much!! It really helped.
- Sun Jan 24, 2021 5:12 am
- Forum: Student Social/Study Group
- Topic: Midterm Study Tips
- Replies: 41
- Views: 1540
Re: Midterm Study Tips
I think doing questions from the textbook will allow you to find the exact topic you are not comfortable with. After finding this out, it will be easier to study because you will know the topics you have to work on. Completing the sapling homework will also help a lot. If you have any questions, ask...
- Sun Jan 17, 2021 5:26 pm
- Forum: Calculating Work of Expansion
- Topic: Sapling Week 3/4 no. 14
- Replies: 4
- Views: 256
Sapling Week 3/4 no. 14
A sample of an ideal gas in a cylinder of volume 3.04 L at 298 K and 2.62 atm expands to 8.40 L by two different pathways. Path A is an isothermal, reversible expansion. Path B has two steps. In the first step, the gas is cooled at constant volume to 1.36 atm. In the second step, the gas is heated a...
- Sun Jan 17, 2021 12:12 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling Week 2 #6
- Replies: 4
- Views: 163
Re: Sapling Week 2 #6
Zoe FC 1C wrote:Ok, thank you! And we just have to memorize the strong acids and bases right? I took 14A over the summer so I'm a little rusty on acids and bases.
Yeah! For Chem14a our professor said we should memorize the strong acids and strong bases because there are only a few compared to the weak ones.
- Sun Jan 17, 2021 12:05 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Pressure Rule
- Replies: 29
- Views: 1307
Re: Pressure Rule
This only applies to gases because they can be compressed. However, liquids and solids cannot be compressed therefore could not work.
- Sat Jan 16, 2021 10:44 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ka vs kb
- Replies: 20
- Views: 474
Re: ka vs kb
Yes! Ka and Kb is essentially the same when it comes to calculations, but different only for naming purposes.
- Sat Jan 16, 2021 6:34 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
You talk funny when you breathe helium!
He He He
He He He
- Sat Jan 16, 2021 6:13 pm
- Forum: Ideal Gases
- Topic: Week 3/4 Sapling no. 18
- Replies: 3
- Views: 186
Week 3/4 Sapling no. 18
A 0.305 mol sample of Xe(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 19.3 K. Calculate the amount of heat q required to bring about this temperature change, and find the corresponding total change in the intern...
- Sat Jan 09, 2021 10:06 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
What did one atom say to the other on their first date?
--> I think we bonded.
--> I think we bonded.
- Sat Jan 09, 2021 10:03 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 146751
Re: Reading the textbook
KTran 1I wrote:Are there a lot of topics in the book that are not covered during lecture that show up on tests?
I would advise just checking which topics are repetitive in the textbook and in the syllabus. The textbook gives a lot of detailed questions, so I usually just go through all the topics.
- Sat Jan 09, 2021 9:58 pm
- Forum: Ideal Gases
- Topic: Advice on how to navigate Chem Community
- Replies: 17
- Views: 812
Re: Advice on how to navigate Chem Community
On Chemistry Community you have to log in using your UID, then find CHEM 14B. All the topics are posted there, including questions related to the topic. You can post a new question(like you have done), or repluy to other peoples questions by clicking the post reply button at the bottom of the page.
- Sat Jan 09, 2021 9:51 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: pressure and concentration
- Replies: 3
- Views: 213
Re: pressure and concentration
Why is it that a change in pressure causes an increase in concentration Changing the pressure, changes the conditions of the reaction and therefore the position of equilibrium shifts. When this happens, the shift is toward the side with fewer moles of molecules. Increasing the pressure of a gas is e...
- Sat Jan 09, 2021 9:41 pm
- Forum: Ideal Gases
- Topic: Units of Temperature
- Replies: 82
- Views: 3343
Re: Units of Temperature
We usually use Kelvin when calculating temperature. There is a formula to change Degrees to Kelvin; T(K)=T(C) + 273.15
- Thu Dec 10, 2020 1:53 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
Why do chemists learn about ammonia first?
--> Its pretty basic stuff
--> Its pretty basic stuff
- Thu Dec 10, 2020 1:49 am
- Forum: Conjugate Acids & Bases
- Topic: Alkaline
- Replies: 16
- Views: 710
Re: Alkaline
I think it is right to say that an alkaline solution/compound is the same as a basic solution/compound. However, an ALKALI is a base (that dissolves in water).
Not all bases are alkali but all alkali is base.
Not all bases are alkali but all alkali is base.
- Thu Dec 10, 2020 12:03 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Calculating H+
- Replies: 17
- Views: 827
Re: Calculating H+
America Alvarado wrote:America Alvarado wrote:How do we calculate the [H+] and [OH-] if we are only given the pH. For example, pH of 8.85 at 25 °C.
I think I figured it out, would we do 10^(-8.85) to find [H+]?
Yeah! Then calculate pOH using the formula pH+pOH=14, followed by 10^(-pOH) to calculate [OH-].
- Thu Dec 10, 2020 12:02 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Calculating H+
- Replies: 17
- Views: 827
Re: Calculating H+
pH of 8.85
[H+] = 10^(-8.85)
pOH = 14 - 8.85 = 5.15
[OH-] = 10^(-5.15)
[H+] = 10^(-8.85)
pOH = 14 - 8.85 = 5.15
[OH-] = 10^(-5.15)
- Wed Dec 09, 2020 11:14 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Question
- Replies: 6
- Views: 297
Re: Final Question
I think he posted something about the exact details of what wass going to be on the final. Since acid-base has not shown up anywhere else, I assume there would be a lot of it on the final. Study hard!
- Sun Dec 06, 2020 4:48 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
Did you know that oxygen went on a second date with potassium?
How'd it go?
It went OK2
How'd it go?
It went OK2
- Sun Dec 06, 2020 4:42 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ka
- Replies: 2
- Views: 98
Re: Ka
The acid dissociation constant is the equilibrium constant of the dissociation reaction of an acid and is denoted by Ka. This equilibrium constant is a quantitative measure of the strength of an acid in a solution and is expressed in units of mol/L.
- Sun Dec 06, 2020 4:40 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Sapling #3
- Replies: 7
- Views: 310
Re: Sapling #3
Correct me if I am wrong but octahedral molecules have six atoms bonded to the central atom and no lone electron pairs, making the steric number equal to six. The formation of the surrounding atoms gives octahedral molecules their overall shape of eight connected triangles. Other molecules might not...
- Sun Dec 06, 2020 4:27 pm
- Forum: Conjugate Acids & Bases
- Topic: Conjugate acids vs conjugate base
- Replies: 12
- Views: 802
Re: Conjugate acids vs conjugate base
The conjugate base of a Bronsted-Lowry acid is the species formed after an acid donates a proton.
The conjugate acid of a Bronsted-Lowry base is the species formed after a base accepts a proton.
The conjugate acid of a Bronsted-Lowry base is the species formed after a base accepts a proton.
- Sun Dec 06, 2020 4:16 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Good video -- Coordination #
- Replies: 3
- Views: 283
Re: Good video -- Coordination #
I watch these videos all the time! They are extremely helpful. Especially if you know the exact topic you want to review.
- Sat Nov 28, 2020 11:33 pm
- Forum: Hybridization
- Topic: Conditions for Hybridization
- Replies: 2
- Views: 146
Re: Conditions for Hybridization
The following are the conditions for hybridization to occur: a) The orbitals undergoing hybridization generally belong to the valence of the atom. b) The orbitals taking part in hybridization must have only a small difference of enthalpies. c)It can take place between completely filled, half-filled,...
- Sat Nov 28, 2020 11:23 pm
- Forum: Student Social/Study Group
- Topic: Final Study
- Replies: 32
- Views: 1367
Re: Final Study
Study each topic, then go through the questions we got on sapling as homework. Follow this up by reviewing your problem-solving skills from the textbook. The questions assigned to us are very helpful and make you understand the topics better.
- Sat Nov 28, 2020 11:12 pm
- Forum: Student Social/Study Group
- Topic: Exercising Our Minds and Bodies
- Replies: 120
- Views: 15165
Re: Exercising Our Minds and Bodies
I usually go on hikes or runs, but the weather is getting colder, so I started some yoga.
- Sat Nov 28, 2020 10:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarity
- Replies: 17
- Views: 666
Re: Polarity
To know if a molecule is polar or nonpolar, you can look at its arrangement. Draw out its arrangement and draw arrows - arrows point toward the more electronegative element. If it has a symmetrical arrangement and has arrows that have equal length, the molecule is nonpolar. If it has an asymmetrical...
- Sat Nov 28, 2020 7:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: pi and sigma bonds
- Replies: 17
- Views: 1932
Re: pi and sigma bonds
I usually draw it out to make sure I don’t miss any bonds. Each single bond consists of only one sigma bond and a double bond consists of one sigma bond and one pi bond. Just count them out from the structural diagram.
- Sat Nov 21, 2020 9:28 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polar/ Nonpolar
- Replies: 25
- Views: 1163
Polar/ Nonpolar
Can shape alone tell if a molecule is polar or nonpolar?
- Sat Nov 21, 2020 9:24 pm
- Forum: Ionic & Covalent Bonds
- Topic: Radicals
- Replies: 10
- Views: 393
Re: Radicals
There are different versions of the textbook and some of them have the wrong answer keys for a few of the questions.
I have seen many posts on chemistry community talking about this. So i would recommend just double checking your answers and you should be fine.
I have seen many posts on chemistry community talking about this. So i would recommend just double checking your answers and you should be fine.
- Sat Nov 21, 2020 9:12 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bond Angle
- Replies: 8
- Views: 547
Bond Angle
Is there a way to remember the bond angles for compounds/molecules or should we just memorize them?
- Sat Nov 21, 2020 9:08 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2 Grades
- Replies: 6
- Views: 435
Re: Midterm 2 Grades
I hope the grades are released before Thanksgiving, so we can enjoy the holidays without thinking about it.
- Sat Nov 21, 2020 8:48 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
All the good chemistry jokes ARGON?
I don't ZINC so!
I don't ZINC so!
- Sat Nov 14, 2020 11:25 pm
- Forum: Student Social/Study Group
- Topic: grade worries
- Replies: 119
- Views: 14537
Re: grade worries
I think everyone is worried because we have only done one midterm and I don’t think everyone has done as well as they expected, however we still have time to fix our grades. Just work hard now to get our second midterm grades higher.
- Sat Nov 14, 2020 11:23 pm
- Forum: Ionic & Covalent Bonds
- Topic: Hydrogen bonding not in H2S
- Replies: 3
- Views: 322
Re: Hydrogen bonding not in H2S
Hydrogen bonds require a large electronegative difference which is not found when bonding with S. The electronegative difference between hydrogen and nitrogen and oxygen and fluorine is high therefore forms hydrogen bonds.
- Sat Nov 14, 2020 11:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2
- Replies: 6
- Views: 366
Re: Midterm 2
My TA said it was the same formatting as the first midterm. We will be proctored again and the midterm will be multiple choice questions.
- Sat Nov 14, 2020 11:15 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
Chemistry teacher - What is the chemical formula of water?
Student - HIJKLMNO
Chemistry teacher - What are you talking about??
Student - Yesterday you said it was H to O
Student - HIJKLMNO
Chemistry teacher - What are you talking about??
Student - Yesterday you said it was H to O
- Sat Nov 07, 2020 11:38 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 239992
Re: Tutoring? [ENDORSED]
Other than the APP program and the office hours, is there any other way to get, one on one help?
- Sat Nov 07, 2020 11:28 pm
- Forum: Trends in The Periodic Table
- Topic: # of electrons
- Replies: 23
- Views: 614
Re: # of electrons
how do we count the number of electrons each element has?
The number of electrons is equal to the atomic number. This is the number of protons in an atom.
The number of electrons is equal to the atomic number. This is the number of protons in an atom.
- Sat Nov 07, 2020 11:01 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: F orbitals?
- Replies: 21
- Views: 712
Re: F orbitals?
In one of the lectures he was explaining how the orbitals worked, and he mentioned that we will not be learning details about the f orbitals.
- Sat Nov 07, 2020 10:47 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Why is the 4s state filled before the 3d state?
- Replies: 14
- Views: 731
Re: Why is the 4s state filled before the 3d state?
My TA, Andrew Salmon, talked about the orbitals in discussion this week. It's helpful to draw out the chart making columns of 1-7s, then 2-7p, then 3-7d, and finally 4-7f. From there, lightly draw diagonal arrows over 1s, then 2s, then 2p and 3s, then 3p and 4s, then 3d and 4p and 5s, keep repeatin...
- Sat Nov 07, 2020 10:35 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 333839
Re: Final Jitters
Right before the final, I feel like it is important to take a few minutes to relax and not stress about anything. You need a clear mind before focusing. Also, I would recommend reading ahead of time, before finals week, because there is so much to do and it will be overwhelming to finish everything ...
- Sat Nov 07, 2020 10:31 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
Two men walk into a bar. One man orders H2O. The other says, "I'll have H2O too!"
The second man dies.
The second man dies.
- Fri Oct 30, 2020 12:38 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
Becca Nelson 1J wrote:What is the 2nd best public university's favorite element?
Berkelium!
Why did I laugh so hard at this??
- Fri Oct 30, 2020 12:27 pm
- Forum: Balancing Chemical Reactions
- Topic: Molar Mass
- Replies: 23
- Views: 1825
Re: Molar Mass
Thank you for clarifying for me.
- Fri Oct 30, 2020 12:02 pm
- Forum: Photoelectric Effect
- Topic: Participation points
- Replies: 16
- Views: 640
Participation points
When giving us credit for participating in the chemistry community, will they take our total number of posts and divide by 5 to see how many weeks they are for, or are they actually cross-referencing with the time you post it. If they are referencing, is it possible to check how many points you get ...
- Fri Oct 30, 2020 11:15 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
What do you do with a sick chemist?
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If you can't helium, and you can't curium, you might as well barium.
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If you can't helium, and you can't curium, you might as well barium.
- Fri Oct 30, 2020 11:09 am
- Forum: DeBroglie Equation
- Topic: Sapling Homework Week 2,3,4 No. 25b
- Replies: 2
- Views: 172
Sapling Homework Week 2,3,4 No. 25b
The E.coli bacterium is about 2.3 μm long. Suppose you want to study it using photons of that wavelength or electrons having that de Broglie wavelength. What is the energy Ephoton of the photon? 8.64×10^−20J What is the energy Eelectron of the electron? I understand how to do the first part of this ...
- Sun Oct 25, 2020 1:25 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Where can I buy a webcam for a reasonable price?
- Replies: 60
- Views: 3522
Re: Where can I buy a webcam for a reasonable price?
You do not need to buy a webcam anymore, a phone is good enough. Log on to your zoom call through your phone, and access the midterm from your laptop and you should be fine.
- Sun Oct 25, 2020 12:56 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2982767
Re: Post All Chemistry Jokes Here
What did one charged atom say to the other?
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I got my ION you!
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I got my ION you!
- Sun Oct 25, 2020 12:48 pm
- Forum: Properties of Electrons
- Topic: Marks on Midterm
- Replies: 4
- Views: 156
Marks on Midterm
Are there different marks allocated to different questions? For example, if there was more work to do in one question and another was an easier question, are they both rewarded the same marks?
- Sun Oct 25, 2020 12:42 pm
- Forum: Einstein Equation
- Topic: Scratch paper during the exam
- Replies: 19
- Views: 560
Re: Scratch paper during the exam
I think we are allowed scratch paper as long as the TA can see it when you write. The paper should be visible on the zoom call.
- Sun Oct 25, 2020 12:35 pm
- Forum: Photoelectric Effect
- Topic: Calculations
- Replies: 18
- Views: 590
Re: Calculations
I think they mentioned that they will not try to. trick us in terms of sig figs on the midterm. None the less, you should not round up until the very last answer (final answer).
- Sun Oct 25, 2020 12:30 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bond Forming
- Replies: 8
- Views: 552
Re: Bond Forming
There are Van der Waal forces are the attraction of intermolecular forces between molecules. Therefore small interactions can occur but it depends on the situation because molecules need a certain amount of energy to bond.
- Sun Oct 25, 2020 12:14 pm
- Forum: Ionic & Covalent Bonds
- Topic: strength of bonds
- Replies: 14
- Views: 956
Re: strength of bonds
505106414 wrote:Is an ionic or a covalent bond typically stronger?
Ionic bonds are stronger than covalent bonds because they involve the trtansfer. of electrons rather than a sharing of electrons.
- Sat Oct 24, 2020 11:33 pm
- Forum: Ionic & Covalent Bonds
- Topic: Is ionic or covalent stronger?
- Replies: 31
- Views: 15537
Re: Is ionic or covalent stronger?
It depends on the situation. Covalent bonds are formed from the sharing of electrons between nuclei and, ionic bonds are formed from mutual attractions between oppositely charged ions. Ionic bonds tend to be stronger than covalent bonds. In high school, I was taught that ionic bonds are the stronges...