CHEMISTRY COMMUNITY

Meera McAdam 1C

Hi, I'm unclear on when we must multiply a given delta H or G or S by a factor (of whatever we multiplied its associated chemical reaction equation with.) For example, when adding equations, if you multiply all moles of the molecules by 2, you must also multiply delta H of the reaction by 2. I just ...

Meera McAdam 1C

snacking on cyclohexanes while watching lavelle's lectures

Meera McAdam 1C

Why can you always count on a chemist?
Because chemists try. (chemistry)

Meera McAdam 1C

What's the only thing worse than organic chemistry? GMO chemistry.

Meera McAdam 1C

What's a good way to study for chem tests? Chemistream Lavelle's lectures. (and do hw problems.)

Meera McAdam 1C

Why did the electrode go to jail?

He was charged with a salt and battery.

Meera McAdam 1C

I also still don't understand this question, even after other peoples' explanations. I hope that we can ask someone to review it verbally in person.

Meera McAdam 1C

"Each of the pictures below shows a molecular view of a system undergoing a change at constant temperature. In each case, indicate whether heat is absorbed/given off by the system, whether expansion work is done on or by the system, and predict the signs of q and w for the process." The pi...

Meera McAdam 1C

I know it is formed from carbon dioxide dissolving in water: CO2 + H2O -> H2CO3 But I'm curious about what happens on an atomic level, and why. What kinds of bonds form between which atoms, and what attractive forces lead to them sharing electrons? When I search this on google, nobody really goes an...

Meera McAdam 1C

This number 7B in the 2012 practice final. Between CH3COOH and C(CH3)3COOH, I'm confused. These are oxoacids, so the electronegativity of the withdrawing atoms is the most important here, and I was wondering, why is H more electronegative than a CH3 group? Aren't the C atoms the ones bonded to the r...

Meera McAdam 1C

Yeah, HCl vs. CF4, I don't know and would really like someone to answer this, please.

Meera McAdam 1C

For example, for the SO2 (subscript 2) structure, one structure has an overall FC=0, but two others have an overall charge of FC=-1. Why do we still count these as resonance structures if they are less stable? When drawing a lewis structure, how would I know how many resonance structures there are i...

Meera McAdam 1C

thank you!!

Meera McAdam 1C

I highly doubt it, as Professor Lavelle tends to keep his word. However I would really like to get a good score on that graded quiz, even though there is some material I don't know, so official confirmation of this question by a TA or mod would be helpful.

Meera McAdam 1C

Hi, In one of the professor's previous lectures, he pointed out that nitrogen was an anomaly, because each of its p-orbitals has one electron, for nitrogen to be -1, the electron has to be spin paired into an orbital. Thus it is not favorable because there is electron-electron repulsion. Would someb...

Meera McAdam 1C

Hi, I'm looking for clarification on the valence electrons of the first row of the d-block, namely groups 3-12. Do I take the valence electrons as everything after the last noble gas configuration (Argon, in this case) or do I just take the valence electrons as what's in the 3d and 4s shell, or only...

Meera McAdam 1C

Thanks, that was succinct and helpful.

Meera McAdam 1C

In regards to the partial credit vs. no credit, I was doing a problem where I first wrote down E=-hR/n^2, then needed to find frequency v, so using Einstein's equation E=hv, I divided everything by h. I then put it into the form of Ef - Ei = change in Energy. Essentially, I derived the Rydberg's for...

Meera McAdam 1C

Thanks, I was wondering that too.

Meera McAdam 1C

What kind of fish is only made up of two sodium atoms?

2 Na.

CHEMISTRY COMMUNITY

Search found 20 matches

When to multiply delta H, G, S??

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Re: Quiz Prep 1 #9

Problem 7.15 (fifth edition)

How does carbonic acid form?

Listing acids in order of increasing strength

Re: least covalent character

Do all resonance structures need to be FC=0?

Re: amphoteric [ENDORSED]

Re: Will changes in temperature/pressure on rxns be on quiz 3

Electron affinity of nitrogen

D-block valence electrons? [ENDORSED]

Re: Breaking the Octet Rule

Re: Rydberg Equation [ENDORSED]

Re: Question 18 Part B on Photoelectric Post Assessment [ENDORSED]

Re: CHEM JOKES