Search found 48 matches
- Sat Mar 18, 2023 10:17 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Respondus Update
- Replies: 1
- Views: 352
Respondus Update
How do I know if my respondus is updated? I have a macbook and I already did the 2 question quiz and everything worked fine, does that mean that it is up to date?
- Sat Mar 18, 2023 10:01 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Noble Gas and Equilibrium
- Replies: 7
- Views: 797
Re: Noble Gas and Equilibrium
Hi! So I was told earlier by a TA that any gas that is added that is not a part of the reactants/products will not affect equilibrium because it does not change the concentrations of the reactants and products. But yes, inert gases/noble gases do not affect the equilibrium. I hope this helps!!
- Sat Mar 18, 2023 9:59 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: strong bases and acids
- Replies: 6
- Views: 268
Re: strong bases and acids
Hi! So one thing to note is that weak acids/bases do dissociate, just not fully. Strong acids/bases fully dissociates. I think it is important to note this when calculating for ph or K. So for example, if you have 1.0M of HCl, it will fully dissociate to 1M of H+ and 1M of Cl-. With weak acids/bases...
- Sat Mar 18, 2023 9:54 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5% rule??
- Replies: 6
- Views: 573
Re: 5% rule??
Hi! So the reason we use the 5% rule goes hand-in-hand with the idea that you can ignore x in the denominator. So when K is below 1x10^-3, you can exclude x from the denominator. So the reason you can do this is that the change in x is so small compared to the overall reaction. The way to explain th...
- Sat Mar 18, 2023 9:27 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase Changes
- Replies: 20
- Views: 13762
Re: Phase Changes
Hi! So for the phase change itself we use the equation q=n*deltaH. The delta H you use depends on the phase change. So from solid to liquid, you use deltaH fusion, for liquid to gas you use deltaH vaporization. We use this equation because there is no change in temperature during the phase change si...
- Sat Mar 18, 2023 9:20 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts and Activation Energy
- Replies: 12
- Views: 1056
Re: Catalysts and Activation Energy
Hi! To add one the above answers, a catalyst is an enzyme that is added to the slowest elementary step to speed up the overall reaction.
- Sat Mar 18, 2023 9:17 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalyst Question
- Replies: 9
- Views: 759
Re: Catalyst Question
There's a difference between being used and being consumed. So basically, you can think of it as a not a part of the reaction, A catalyst is simply an enzyme that helps the reaction go faster by lowering the EA. It does this by being added to the slowest elementary step. So catalysts are being used ...
- Sat Mar 18, 2023 9:10 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4917410
Re: Post All Chemistry Jokes Here
I would tell another chemistry joke…
…but all the good ones Argon.
…but all the good ones Argon.
- Sat Mar 18, 2023 9:10 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4917410
Re: Post All Chemistry Jokes Here
I dare you to lower your body temperature to absolute zero.
I promise you’ll be 0K.
I promise you’ll be 0K.
- Sat Mar 18, 2023 9:05 pm
- Forum: Calculating Work of Expansion
- Topic: Work of expansions vs work of compression
- Replies: 3
- Views: 613
Work of expansions vs work of compression
Is work of expansion always negative and work of compression always positive in respect of the system?
- Sat Mar 18, 2023 9:02 pm
- Forum: Student Social/Study Group
- Topic: Saying thank you to Vivek (UA)
- Replies: 3
- Views: 11553
Saying thank you to Vivek (UA)
I went to pretty much all of Vivek's UA sessions and he helped me so much understand all the topic and was very kind and understanding when I asked questions. All his worksheets were very relevant to what we were learning and helped a lot when reviewing for exams. Thank you Vivek!
- Sat Mar 18, 2023 8:58 pm
- Forum: Student Social/Study Group
- Topic: New Chill Music :)
- Replies: 52
- Views: 4228
Re: New Chill Music :)
When studying and doing homework, I listen to classical music, so for example I listen to Einstein Study Music Academy.
- Sat Mar 18, 2023 8:52 pm
- Forum: Conjugate Acids & Bases
- Topic: Review Worksheet question
- Replies: 2
- Views: 414
Re: Review Worksheet question
I was at that review session and the answer is both A and D. For starters increasing the pH means more basic solution. Both OH- and NaCH3COO- are basic so adding it to the solution would make the overall solution more basic. An important thing to note is that we are looking at the problem with the n...
- Sat Mar 18, 2023 8:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem Community Points
- Replies: 7
- Views: 683
Re: Chem Community Points
Do all the posts have to be related to chem to receive points, or as long as it is 30, were fine?
- Sat Mar 18, 2023 8:43 pm
- Forum: Student Social/Study Group
- Topic: How has everybody been preparing for the final?
- Replies: 10
- Views: 878
Re: How has everybody been preparing for the final?
I looked at the UA worksheets, going to as many review sessions as possible, and rewatching lectures for more conceptual review!
- Sat Mar 18, 2023 8:41 pm
- Forum: Student Social/Study Group
- Topic: Comfort Movies
- Replies: 168
- Views: 78938
Re: Comfort Movies
My comfort movie is definitely mean girls. I have more comfort shows which include, grey's anatomy, criminal minds, and modern family.
- Sat Mar 18, 2023 8:38 pm
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 6
- Views: 605
Re: Final
It is 25 multiple choice questions, including all topics. A TA told me that the amount of time we spent on the topic in class equals the percentage of the test. For example, we covered acids and bases for 1 week, so it will be 10% of the final.
- Sat Mar 18, 2023 8:36 pm
- Forum: Student Social/Study Group
- Topic: Fave food
- Replies: 266
- Views: 76133
Re: Fave food
my favorite food is definitely suhsi and pasta. I'm going to be having one of those after finals as a prize.
- Sat Mar 18, 2023 8:34 pm
- Forum: General Rate Laws
- Topic: Clarification on finding k
- Replies: 2
- Views: 127
Clarification on finding k
When finding k for elementary steps, you just look at the stoichiometric coefficient, and for overall reactions, you calculate it right?
- Sat Mar 18, 2023 4:00 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: K units
- Replies: 3
- Views: 585
K units
I was at a step up and the UA gave me a very helpful way to determine K units, it is: 1/(M^(overall order -1)S). I hope this helps!
- Sat Mar 18, 2023 3:58 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetically stable vs. Thermodynamically stable
- Replies: 3
- Views: 737
Kinetically stable vs. Thermodynamically stable
What is the difference between something being Kinetically stable vs. Thermodynamically stable
- Sat Mar 18, 2023 3:56 pm
- Forum: First Order Reactions
- Topic: rate-determining step
- Replies: 5
- Views: 724
rate-determining step
What does it mean when the questions asks about the rate-determining step?
- Sat Mar 18, 2023 3:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: E naught
- Replies: 4
- Views: 204
E naught
Is Enaught considered a state function?
- Sat Mar 18, 2023 3:50 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: when to approximate
- Replies: 11
- Views: 499
Re: when to approximate
The cut off value is 10^-3. If the value of K is smaller, such as 10^-10, the you can remove the x that was part of the equilibrium concentration for the reactant. For example, if you had, x^2/0.025-x, it would become x^2/0.025. I hope this helps!
- Sat Mar 18, 2023 3:45 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Ea
- Replies: 3
- Views: 562
Ea
In order to determine whether a step has a high Ea or not do we just look at whether it is slow or fast, or are there other factors that determine whether it can have a high Ea
- Sat Mar 18, 2023 3:39 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalyst question
- Replies: 3
- Views: 233
Catalyst question
So to make a reaction go faster, you would add the catalyst to the slowest elementary step right?
- Sat Mar 18, 2023 3:37 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Quadratic Equation uses
- Replies: 9
- Views: 465
Re: Quadratic Equation uses
This rule applies because it means that the change in x is so small to the point where you can ignore it. Don't forget, this does not mean that x=0. A real life example of this is if someone is a millionaire, and they give 1,000 dollars to someone, people would say that they are still a millionaire ...
- Sat Mar 18, 2023 3:34 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 713739
Re: Final Jitters
What has helped me a lot is to make sure I get a good night sleep. Although very tempting, it is not good for you to stay up all night studying. Also make sure you eat a good breakfast before the exam and take some deep breaths before entering. Remember that your life does not depend only on this ex...
- Sat Mar 18, 2023 3:31 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Conducting Metal
- Replies: 4
- Views: 457
Conducting Metal
How do you know if a solid is conducting? Or are all metals conducting?
- Sat Mar 18, 2023 3:26 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4917410
Re: Post All Chemistry Jokes Here
Someone threw sodium chloride at me.
I yelled, “That’s a salt!”
I yelled, “That’s a salt!”
- Sat Mar 18, 2023 3:26 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4917410
Re: Post All Chemistry Jokes Here
Did you hear the one about cobalt, radon, and yttrium?
It was CoRnY
It was CoRnY
- Sat Mar 18, 2023 3:25 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4917410
Re: Post All Chemistry Jokes Here
Two chemists walk into a bar.
One says, “I’ll have an H2O.” The other says, “I’ll have an H2O too.” The second chemist dies.
Hydrogen peroxide is very dangerous!
One says, “I’ll have an H2O.” The other says, “I’ll have an H2O too.” The second chemist dies.
Hydrogen peroxide is very dangerous!
- Sat Mar 18, 2023 3:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 984681
Re: Saying Thank You to Dr. Lavelle
I did not have the best experience in Chem 14A so I was very nervous coming into this class. Dr. Lavelle has completely changed my perspective on chemistry and I just want to say thank you. I really learned a lot in the class and although pretty challenging, overall I enjoyed this class so much more...
- Mon Feb 20, 2023 10:15 am
- Forum: Administrative Questions and Class Announcements
- Topic: Chemistry Webiste
- Replies: 1
- Views: 135
Chemistry Webiste
I am getting an error page when I am trying to login into the webiste. How can I fix this?
- Mon Feb 20, 2023 9:23 am
- Forum: Chem 14B Uploaded Files (Worksheets, etc.)
- Topic: Adila's Workshop Week 7/ Midterm 2 Review Session Topic is endorsed
- Replies: 2
- Views: 666
Re: Adila's Workshop Week 7/ Midterm 2 Review Session Topic is endorsed
Can you please post the answer key after the session because I cannot attend at 2pm
- Sun Feb 12, 2023 9:44 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4917410
Re: Post All Chemistry Jokes Here
Old chemists never die, they just stop reacting.
- Sun Feb 12, 2023 9:35 pm
- Forum: Student Social/Study Group
- Topic: For students that got an A on the first midterm, how did you study?
- Replies: 6
- Views: 411
Re: For students that got an A on the first midterm, how did you study?
I feel the midterm was very content heavy, what is the best way to study this way?
- Sun Feb 12, 2023 9:25 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student - Part II [ENDORSED]
- Replies: 298
- Views: 539086
Re: Advice from a Medical Student - Part II [ENDORSED]
What were the extracurriculars you did to be a competitive applicant?
- Sun Feb 12, 2023 9:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student - Part II [ENDORSED]
- Replies: 298
- Views: 539086
Re: Advice from a Medical Student - Part II [ENDORSED]
I feel some very intense imposter syndrome right now? What is the best way to get over it?
- Sun Feb 05, 2023 2:58 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4917410
Re: Post All Chemistry Jokes Here
I'd give you some more chemistry jokes, but all the good ones argon.
- Sun Feb 05, 2023 2:56 pm
- Forum: Phase Changes & Related Calculations
- Topic: Studying Method
- Replies: 18
- Views: 520
Studying Method
Where can I find more questions that test my knowledge conceptually, last midterm was concept heavy and not much math, so I want more questions that test my knowledge of the concept. Thanks!
- Sun Feb 05, 2023 2:50 pm
- Forum: Phase Changes & Related Calculations
- Topic: Energy
- Replies: 4
- Views: 226
Re: Energy
I think there can be a decrease in disorder because it depends on the change of entropy, so if entropy is negative, then disorder decreases.
- Sun Jan 22, 2023 9:10 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4917410
Re: Post All Chemistry Jokes Here
Lose an electron?
Gotta keep an ion it.
Gotta keep an ion it.
- Sun Jan 22, 2023 9:10 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4917410
Re: Post All Chemistry Jokes Here
Gold is the best element because it's AU-some.
- Sun Jan 22, 2023 9:07 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: strong/weak acids and bases
- Replies: 5
- Views: 338
Re: strong/weak acids and bases
Hi! Weak acids and weak bases do not completely disassociate and strong acids and strong bases do.
- Sun Jan 15, 2023 7:40 pm
- Forum: Ideal Gases
- Topic: PV=nRT
- Replies: 76
- Views: 4309
Re: PV=nRT
Based on the units of P, you decide which R to use. The units must cancel out, so R and P must be in the same unit
- Sun Jan 15, 2023 7:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K and Kc/Kp
- Replies: 8
- Views: 259
Re: K and Kc/Kp
Hi! So K can be used to describe Kc and Kp but Kc is talking about molar concentrations in moles per liter ^-1 and Kp is talking about partial pressure for gases.
- Sat Jan 14, 2023 3:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Homogeneous equilibrium vs. heterogeneous equilibrium?
- Replies: 2
- Views: 226
Re: Homogeneous equilibrium vs. heterogeneous equilibrium?
Homogeneous equilibrium is when all products and reactions are in the same phase. For example all reactants and products would be in the gas phase and have a (g) next to it. Heterogeneous equilibrium is when at least one product or reaction is in a different phase. For example, some can be liquid an...