CHEMISTRY COMMUNITY

Augustin Kelly 3E

Lately, when studying, I've been getting into more ambient stuff, like Aphex Twin and Duster. Cocteau Twins are also good for studying. If I listen to Frank Ocean or other RnB artists, I just start singing and distracting myself.

Augustin Kelly 3E

I don't really have a particular comfort movie (maybe Parasite?), but my roommate's comfort movie has to be The Menu. He watched that movie about 5 times over the course of 2 weeks, honestly incredible on his part.

Augustin Kelly 3E

KING CRAB. If you go to one of those restaurants where it's served in a plastic bag with all the cajun seasoning and butter at the bottom, seeping into it, oh me oh my. Honestly unparalleled food right there. Too bad it's really expensive, but for celebrations, it is objectively the best food ever a...

Augustin Kelly 3E

My favorite candy is probably sour patch kids. The number of times I tore my tongue up because of the citric acid on those little guys.

Augustin Kelly 3E

Thank you Dr. Lavelle! I regret not signing up for an in-person lecture, but you have provided us with enough resources so that we can do well even online!

Augustin Kelly 3E

I am going to make sure that I get a healthy amount of sleep, then in the morning I will eat a small breakfast, and if I need to, make a cup of tea or something to keep me awake and focused.

Augustin Kelly 3E

The oxidation number can usually be assumed by an ion's charge, and it is usually easy to keep in mind that Oxygen is -2, Hydrogen is either +1 or -1 depending on what it is bonded to, and natural elements are always 0.

Augustin Kelly 3E

Always remember that deltaG = deltaH - TdeltaS. If deltaG is negative, then the reaction will be spontaneous, and if deltaG is positive, then the reaction is nonspontaneous and the reverse reaction is instead spontaneous.

Augustin Kelly 3E

Question 18 on the recent achieve helps a lot in determining the difference between an intermediate and a catalyst. A catalyst is present at the beginning but not present in the final reaction, while an intermediate is neither present at the beginning nor in the final product.

Augustin Kelly 3E

That ice example helps a lot. Do you know if zero-order reactions are very common because of this, or would first-order reactions be more common?

Augustin Kelly 3E

Do you guys think that the equations and formulas sheet will be sufficient though? Like as long as we know how to use what's on there? Or would there be stuff that isn't on there?

Augustin Kelly 3E

Hi Jayla, I was looking at a chart that somebody posted on a different forum, which has been helping me out a lot. It shows that for zero-order half-life it is t1/2 = 1/2[A]k, for first-order half-life it is t1/2 = .0693/k, and for second-order half-life it is t1/2 = 1/(k[A]). I hope this helps!

Augustin Kelly 3E

I believe that the question had us assume that "all other factors were equal", which in this case probably meant that we can assume that A=1 for the equation.

Augustin Kelly 3E

I really wish I could use my TI-84 plus but instead I have been using a Casio fx-300ES. It's alright.

Augustin Kelly 3E

I have been reviewing my achieve answers, and also looking at the textbook problems

Augustin Kelly 3E

I tried loading the external tool tonight but it just said that the site can't be reached. I was looking forward on being productive tonight too :( Is anyone else experiencing this issue?

Augustin Kelly 3E

I think it just depends on the context of the question, like if it is asking about the total amount of heat, or the amount of heat per mol.

Augustin Kelly 3E

I think that as the number of molecules increases, degeneracy can change, because you calculate it by doing (number of states)^number of particles

Augustin Kelly 3E

Insulated systems prevent heat transfer between the system and the surroundings, while an isolated system has no energy transfer whatsoever with its surroundings.

Augustin Kelly 3E

The midterm will be at 6 pm on Wednesday.

Augustin Kelly 3E

It never hurts to convert to Kelvin, but since 1 degree of change is the same for both Celsius and Kelvin, it doesn't really matter for addition and subtraction. However, for multiplying and dividing temperatures, you should convert to Kelvin.

Augustin Kelly 3E

So I guess that when it comes to worrying about the sign, it depends on whether you are just using the heat value for a calculation, or if the problem is actually asking whether heat is lost or gained. This calorimeter question is asking about the amount of heat that was moved, and for this specific...

Augustin Kelly 3E

For this at least, since we are just looking at the amount of heat moved for the calculations, we only care about its absolute value. The sign in this case is just to denote that heat was released.

Augustin Kelly 3E

Yup, exothermic reactions have negative enthalpy, because heat is released from the system in those reactions, while endothermic reactions have positive enthalpy since those reactions absorb heat into the system.

Augustin Kelly 3E

Because every chemical reaction involves the breaking or forming of bonds, every reaction is either endothermic or exothermic since energy is either absorbed or released. I guess it would be possible for the energy released to equal the energy absorbed, though this would be very unlikely to happen, ...

Augustin Kelly 3E

I doubt there would be a curve because its total point system, but I do wonder if partial credit will be given for some answers.

Augustin Kelly 3E

Hi, I was wondering what resources you guys are personally finding to be the most helpful for studying for the midterm. Good luck on Wednesday!

Augustin Kelly 3E

Yeah, I'm pretty sure that we can't use graphing calculators. Do you think the calculator on the platform is good, or would it be better to just buy a scientific calculator?

Augustin Kelly 3E

Do you know if he posted a list of supplies to bring to the midterm? I get that we should probably bring a laptop, pencil, scientific calculator, and the 2 printouts. Should we bring anything else?

Augustin Kelly 3E

I'm in the hybrid class so I haven't heard too much info, but did he say how long the midterm would be and what format it would be?

Augustin Kelly 3E

Thank you so much! This walkthrough was super helpful because I was also stuck on this problem.

Augustin Kelly 3E

That makes it a lot easier to remember. So
Exo: Gives off heat, and forms bonds
Endo: Absorbs heat, and breaks bonds, right?
Thank you!

Augustin Kelly 3E

Since Kc has to do with concentration, I would assume that for questions dealing with concentration, you would use Kc, and then use K otherwise? I'm not super sure myself but that is my guess.

Augustin Kelly 3E

A chemist and his friend get drinks.
The chemist says "I'll have H2O."
His friend thinks that's so cool, and says "I'll have H2O too!"
They drink their drinks, and the friend vomits profusely.

CHEMISTRY COMMUNITY

Search found 34 matches

Re: New Chill Music :)

Re: Comfort Movies

Re: Fave food

Re: Fav Candy

Re: Saying Thank You to Dr. Lavelle

Re: Final Jitters

Re: oxidation number

Re: entropy and spontaneity

Re: Intermediate

Re: Week 9- Zero Order and Reactants

Re: How deep do we need to know about the equations?

Re: What does zero order mean

Re: KINETICS ACHIEVE 20

Re: What Calculator to use

Re: How has everybody been preparing for the final?

Is Macmillan Learning down?

Re: Is q in kj/mol or kj?

Re: How can degeneracy change?

Re: What is the difference between an insulated and isolated system?

Re: Midterm

Re: K or Celcius

Re: Achieve Weeks 3/4 #12

Re: Achieve Weeks 3/4 #12

Re: Exothermic and Endothermic

Re: Endo/exo

Re: Grades for Midterm

Which resources seem the most helpful?

Re: Calculator

Re: Midterm

Re: What topics are on the Chem 14B midterm (2/1)?

Re: Question 5 on the Homework for Week 1

Re: endothermic vs exothermic

Re: K vs KC

Re: Post All Chemistry Jokes Here