Search found 20 matches

by Meera McAdam 1C
Sat Mar 18, 2017 10:22 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: When to multiply delta H, G, S??
Replies: 1
Views: 273

When to multiply delta H, G, S??

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 ...
by Meera McAdam 1C
Sat Mar 18, 2017 9:49 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1010927

Re: Post All Chemistry Jokes Here

snacking on cyclohexanes while watching lavelle's lectures
by Meera McAdam 1C
Sun Mar 12, 2017 11:41 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1010927

Re: Post All Chemistry Jokes Here

Why can you always count on a chemist?
Because chemists try. (chemistry)
by Meera McAdam 1C
Sun Mar 05, 2017 11:43 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1010927

Re: Post All Chemistry Jokes Here

What's the only thing worse than organic chemistry? GMO chemistry.
by Meera McAdam 1C
Sat Feb 25, 2017 11:47 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1010927

Re: Post All Chemistry Jokes Here

What's a good way to study for chem tests? Chemistream Lavelle's lectures. (and do hw problems.)
by Meera McAdam 1C
Mon Feb 20, 2017 12:11 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1010927

Re: Post All Chemistry Jokes Here

Why did the electrode go to jail?

He was charged with a salt and battery.
by Meera McAdam 1C
Sun Feb 05, 2017 11:46 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Quiz Prep 1 #9
Replies: 2
Views: 375

Re: Quiz Prep 1 #9

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.
by Meera McAdam 1C
Sun Jan 29, 2017 11:36 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Problem 7.15 (fifth edition)
Replies: 1
Views: 228

Problem 7.15 (fifth edition)

"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...
by Meera McAdam 1C
Sun Jan 22, 2017 10:48 pm
Forum: General Science Questions
Topic: How does carbonic acid form?
Replies: 2
Views: 902

How does carbonic acid form?

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...
by Meera McAdam 1C
Sun Dec 04, 2016 10:17 am
Forum: Bronsted Acids & Bases
Topic: Listing acids in order of increasing strength
Replies: 1
Views: 703

Listing acids in order of increasing strength

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...
by Meera McAdam 1C
Sun Dec 04, 2016 10:07 am
Forum: Ionic & Covalent Bonds
Topic: least covalent character
Replies: 4
Views: 590

Re: least covalent character

Yeah, HCl vs. CF4, I don't know and would really like someone to answer this, please.
by Meera McAdam 1C
Sun Dec 04, 2016 10:01 am
Forum: Resonance Structures
Topic: Do all resonance structures need to be FC=0?
Replies: 4
Views: 638

Do all resonance structures need to be FC=0?

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...
by Meera McAdam 1C
Sun Nov 20, 2016 11:55 pm
Forum: Bronsted Acids & Bases
Topic: amphoteric [ENDORSED]
Replies: 2
Views: 428

Re: amphoteric [ENDORSED]

thank you!!
by Meera McAdam 1C
Sun Nov 13, 2016 10:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Will changes in temperature/pressure on rxns be on quiz 3
Replies: 1
Views: 500

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

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.
by Meera McAdam 1C
Mon Oct 31, 2016 11:42 pm
Forum: Trends in The Periodic Table
Topic: Electron affinity of nitrogen
Replies: 1
Views: 368

Electron affinity of nitrogen

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...
by Meera McAdam 1C
Wed Oct 26, 2016 9:15 pm
Forum: Trends in The Periodic Table
Topic: D-block valence electrons? [ENDORSED]
Replies: 4
Views: 2156

D-block valence electrons? [ENDORSED]

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...
by Meera McAdam 1C
Sun Oct 23, 2016 11:51 pm
Forum: Resonance Structures
Topic: Breaking the Octet Rule
Replies: 6
Views: 875

Re: Breaking the Octet Rule

Thanks, that was succinct and helpful.
by Meera McAdam 1C
Thu Oct 13, 2016 12:17 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation [ENDORSED]
Replies: 4
Views: 537

Re: Rydberg Equation [ENDORSED]

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...
by Meera McAdam 1C
Sun Oct 02, 2016 11:45 pm
Forum: Student Social/Study Group
Topic: CHEM JOKES
Replies: 29
Views: 3474

Re: CHEM JOKES

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

2 Na.

Go to advanced search