CHEMISTRY COMMUNITY

Katy Austin 1K

Can anyone explain what the significance of molecularity is?

Katy Austin 1K

Eo is unaffected by any sort of multiplication as it is a constant standard for that reduction reaction independent of any coefficients. So if you had to multiply the anode half reaction by 2 to get matching electrons with the cathode half reaction, you do not apply this factor to the standard pote...

Katy Austin 1K

When finding standard potentials, if the equation needs to be reversed on the table, do you just flip the sign of Eo?

Katy Austin 1K

The first thing I did was balance the chlorines. After that I balance the oxygens by adding water to the right side, and then I balanced the hydrogens by adding water to the left side. Since adding more water to the left side added more oxygens to that side, I added hydroxides to the right side (si...

Katy Austin 1K

The first thing I did was balance the chlorines. After that I balance the oxygens by adding water to the right side, and then I balanced the hydrogens by adding water to the left side. Since adding more water to the left side added more oxygens to that side, I added hydroxides to the right side (si...

Katy Austin 1K

How would you balance the half reaction (in a basic solution): Cl2O7 --> ClO2-
I swear I've been following all of the steps but can't do it for the life of me

Katy Austin 1K

I typically like to type my notes because I feel like it's easier to save and refer to them later but for this class I hand wrote my notes because of all of the math and graphs.

Katy Austin 1K

Also, does anyone have writing class recommendations for if I don't get into chem 14cl?

Katy Austin 1K

I'm on the waitlist currently for 14CL. Does anyone know if I'm likely going to be able to get into the class? Also, how easy is it to change section times once you're in a class?

Katy Austin 1K

taking 14C and CL if I get off the waitlist!

Katy Austin 1K

Do catalysts affect the rate or Ea of reverse reactions?

Katy Austin 1K

you may also need to use equation: lnK=nFEcell o/RT
because both sides equal delta Go

Katy Austin 1K

Kareena Patel 1G wrote:I think that these are the ones we need to know. Most of them are on the equation sheet though. Screen Shot 2021-03-08 at 9.32.51 AM.png

for the last 2 equations, why does ln change to log?

Katy Austin 1K

acidic solutions:
- balance O using H2O
- balance H using H+

basic solutions:
- balance O using H2O
- balance H by adding H20 to one side and OH- to the other

Katy Austin 1K

It represents the frequency of collisions between reactant molecules at standard concentration (which is why it's also called frequency factor). It is temperature-dependent and should be given to you unless you're needing to find it, in which case you would use the Arrhenius equation and plugin val...

Katy Austin 1K

Also, there are many other pre-health options other than being pre-med! I've also considered becoming a PA. I think ls 110 is a class that gives options for potential careers in life sciences other than being a physician.

Katy Austin 1K

I feel the same sometimes! It's helpful to remember that you won't need to know the material we are learning to be successful at your job someday! Besides needing chemistry knowledge for the MCAT, you don't need to be a chem genius to be a good doctor. Upper division classes should also be more inte...

Katy Austin 1K

Is there a GroupMe started for 14C?

Katy Austin 1K

Chem 14C, on the waitlist for CL, Psych 100B and looking to add another. Any suggestions?

Katy Austin 1K

Oops, this was supposed to be posted in the 14B section not 14A

Katy Austin 1K

Who's taking 14C next quarter? Is there a groupme started for it?

Katy Austin 1K

Can someone explain the pre-exponential factor (A) and its significance?

Katy Austin 1K

Tacos tu Madre!

Katy Austin 1K

Tacos tu Madre!

Katy Austin 1K

ice cream and pasta!

Katy Austin 1K

I am planning to take Chem 14C, LS7B, LS23L, Psych 100A, and might try to enroll in Ling 1, although the fact that its 100 spot waitlist is closed may stop me from doing that HAHA. I'm not too disappointed with that since the four classes I'm planning to take require a lot of my time and attention,...

Katy Austin 1K

I'm planning on taking Chem 14C, Psych 100B, and I really wanted to take 14CL but I have to wait and see if some spots open up. I'm also taking LS 110 because all of the other classes I need to take are full.

Katy Austin 1K

Jayasree Peri 2J wrote:
Katy Austin 1K wrote:Also can someone check if this is correct:
P should be in bars
V should be in L
T should be in K

I actually converted P from bars to atm using the 1 atm = 101.325 bar conversion. I did this because there is no R constant that has atm as the unit for pressure.

ok awesome thank you!

Katy Austin 1K

Jayasree Peri 2J wrote:
Katy Austin 1K wrote:Also can someone check if this is correct:
P should be in bars
V should be in L
T should be in K

I actually converted P from bars to atm using the 1 atm = 101.325 bar conversion. I did this because there is no R constant that has atm as the unit for pressure.

ok awesome thank you!

Katy Austin 1K

Also can someone check if this is correct:
P should be in bars
V should be in L
T should be in K

Katy Austin 1K

Hi! I am also stuck on this problem and I am wondering does R= 8.314 J/molK in the equation PV=nRT?

Katy Austin 1K

I hope this hasn't been done already because I love this joke...

Q: What kind of dogs do scientists have?

A: Laboratory Retrievers

Katy Austin 1K

To the girl asking about the difference between 14C and CL: CL is the second lab course for the 14 series. You have to take it either at the same time or after completing 14C.

Katy Austin 1K

I know it wasn't uncommon for chemistry professors to curve their class' midterm grades when everything was in person. Is that something that could still happen for online tests?

Katy Austin 1K

Hi! I also felt the same way! I thought I had prepared really well and felt fairly confident going into the test but felt super confused by almost half of the questions. You're not alone! I had a different professor last quarter who had free-response tests which I think I preferred because I could u...

Katy Austin 1K

It's also helpful to remember that you only need to focus on net changes! Since it is a state function, you don't have to worry about every specific input and output - just make sure you understand what the net change is.

Katy Austin 1K

It's also helpful to remember that you only need to focus on net changes! Since it is a state function, you don't have to worry about every specific input and output - just make sure you understand what the net change is.

Katy Austin 1K

Q: What is a chem student's favorite sushi?

A: Spicy 2-Na roll!

Katy Austin 1K

Which practice questions are the most useful for test prep? Sapling? Homework? TA/LA reviews? I know Dr. Lavelle says he takes questions from Sapling and the homework but I made sure to do all of those practice problems and still found the midterm to be confusing.

Katy Austin 1K

Which practice questions are the most useful for test prep? Sapling? Homework? TA/LA reviews? I know Dr. Lavelle says he takes questions from Sapling and the homework but I made sure to do all of those practice problems and still found the midterm to be confusing.

Katy Austin 1K

He just sent out an update that the grade should be in by the end of tomorrow (Wednesday of week 5) night!

Katy Austin 1K

He just sent out an update that the grade should be in by the end of tomorrow (Wednesday of week 5) night!

Katy Austin 1K

How can you tell if a salt is acidic, basic, or neutral?

Katy Austin 1K

What is the equation for percent ionization? Is percent ionization just the same thing as percent deprotonation?

Katy Austin 1K

Hi, can someone remind me what the (I) is after compounds in written chemical reactions?

Katy Austin 1K

If K > 10^3, equilibrium strongly favors P and if K<10^-3, equilibrium strongly favors R. Intermediate values (10^-3<K< 10^3) of K don't strongly favor either products or reactants but do slightly favor them.

Katy Austin 1K

The ICE tables that Dr. Lavelle discussed on Friday should probably help!

Katy Austin 1K

Has anyone started a GroupMe for lecture 1 for reminders and study groups and such?

Katy Austin 1K

Has anyone started a GroupMe for discussion 1K?

Katy Austin 1K

Inert gases are usually noble gases that typically don't have an effect on the reaction taking place. As Dr. Lavelle said in lecture, adding an inert gas changes the pressure but will not change the concentrations of the reactants and therefore will have no effect on K.

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