Search found 20 matches

by AnnaTong1E
Mon Mar 13, 2017 6:10 pm
Forum: *Cyclopropanes and Cyclobutanes
Topic: Difference between bond angle strain and steric strain
Replies: 2
Views: 557

Re: Difference between bond angle strain and steric strain

Is there a clear definition for steric strain?
by AnnaTong1E
Fri Mar 03, 2017 7:56 pm
Forum: *Alkanes
Topic: Naming [ENDORSED]
Replies: 92
Views: 8289

Re: Naming [ENDORSED]

It should be the smallest number - from either end of the chain.
by AnnaTong1E
Fri Mar 03, 2017 7:49 pm
Forum: *Nucleophilic Substitution
Topic: Electron flow arrows
Replies: 2
Views: 601

Electron flow arrows

When drawing the electron-flow arrows, is it necessary to indicate the dipole of the molecule(s) (by writing either δ- or δ+) to explain why we are drawing the arrows? Or do arrows suffice?
by AnnaTong1E
Thu Feb 23, 2017 4:41 pm
Forum: Administrative Questions and Class Announcements
Topic: Starting Organic Chem
Replies: 1
Views: 340

Starting Organic Chem

Since we have started the organic chemistry portion of the class, will the lecture still be based off of what is in the course reader? Or is it shifting to the other green book, Introduction to Organic Chemistry?
Just trying to figure out which one to bring to lecture.
Thanks!
by AnnaTong1E
Tue Feb 21, 2017 2:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 15311

Re: Quiz 2 Winter 2017

Is there any place that all of the course reader quiz 2 answers (written out, long, and explanatory) are compiled in one place? I know there are the answers on this site.
by AnnaTong1E
Fri Feb 17, 2017 2:56 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetically controlled reaction
Replies: 2
Views: 423

Kinetically controlled reaction

How do you know when a reaction is kinetically controlled?
by AnnaTong1E
Mon Feb 06, 2017 8:43 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Class Demonstration [ENDORSED]
Replies: 1
Views: 336

Class Demonstration [ENDORSED]

Can someone please explain the demonstration that happened in class today? I was there but I couldn't see it very well not could I hear much of what was going on.


Thanks!
by AnnaTong1E
Mon Jan 23, 2017 9:32 pm
Forum: Administrative Questions and Class Announcements
Topic: Bruincast
Replies: 26
Views: 8094

Re: Bruincast

I was unable to attend lecture today and I tried to watch lecture videos on bruincast but there were technical errors or the video just wasn't there. Is anyone else having this problem or is it just me temporarily? Will this be resolved or should I figure out another way to review the lecture? Thanks
by AnnaTong1E
Sun Jan 22, 2017 11:20 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1015181

Re: Post All Chemistry Jokes Here

ha... haha.. ha
by AnnaTong1E
Wed Jan 18, 2017 9:01 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated Systems [ENDORSED]
Replies: 1
Views: 264

Isolated Systems [ENDORSED]

In the course reader, there are three ways of changing the energy of a system, but they only apply to closed or open systems. How does one change the energy of an isolated system?
by AnnaTong1E
Sat Dec 03, 2016 11:57 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Ka assumptions
Replies: 1
Views: 328

Ka assumptions

Do you always have to back up your assumption when assuming (for example) 0.1 M - X is about equal to 0.1M when the Ka is less than 10^-5 with the percent ionization?
by AnnaTong1E
Sat Dec 03, 2016 11:52 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1015181

Re: Post All Chemistry Jokes Here

Heisenberg, Schrodinger, and Ohm are riding in a car. They get pulled over. Heisenberg is driving and the cop asks him, "Do you know how fast you were going?" "No, but I know exactly where I am," Heisenberg replies. The cop says, "You were doing 55 in a 35." Heisenberg ...
by AnnaTong1E
Wed Nov 30, 2016 5:18 pm
Forum: Conjugate Acids & Bases
Topic: What does a conjugate acid/base do? [ENDORSED]
Replies: 4
Views: 867

Re: What does a conjugate acid/base do? [ENDORSED]

Do the conjugate acids and bases have any function other than being the things that form when acids donate protons and bases accept them?
by AnnaTong1E
Sun Nov 20, 2016 4:16 pm
Forum: Amphoteric Compounds
Topic: Amphoteric Compound [ENDORSED]
Replies: 1
Views: 396

Amphoteric Compound [ENDORSED]

Is water the only amphoteric compound we will be expected to know?
by AnnaTong1E
Sat Nov 12, 2016 4:25 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Quotient [ENDORSED]
Replies: 4
Views: 815

Reaction Quotient [ENDORSED]

Are solids and liquids not included in the reaction quotient expression?
I know they are not included in the equilibrium constant calculation but I don't know if it applies to reaction quotients as well.

Thanks!
by AnnaTong1E
Fri Oct 28, 2016 3:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma/Pi Bonds
Replies: 2
Views: 308

Sigma/Pi Bonds

Can someone explain this please? It was mentioned in the lecture today but I didn't really get it

"Sigma bonds refer to hybridized orbitals.
Pi bonds refer to unhybridized orbitals.
Geometry follows hybridization."

Thanks in advance!
by AnnaTong1E
Fri Oct 21, 2016 2:19 pm
Forum: Resonance Structures
Topic: Radicals
Replies: 3
Views: 441

Radicals

How do radicals "damage" DNA by reacting with it? I forgot to write down this part of the lecture in my notes & I just want to know for general knowledge
by AnnaTong1E
Thu Oct 13, 2016 9:01 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Affinity
Replies: 6
Views: 614

Electron Affinity

Could someone please give me a solid, clear definition of electron affinity? I understand ionization energy and atomic radius and their trends in the periodic table, but I don't think I fully understand electron affinity.

Thanks! :)
by AnnaTong1E
Tue Oct 04, 2016 11:44 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: 1.11 Different Series
Replies: 3
Views: 483

Re: 1.11 Different Series

When you say a Lyman series always transitions to n=1, do you mean that this is where the electrons come to rest (at energy level=1?)

Just a little confused on this part & hoping some clarification will help! Thanks
by AnnaTong1E
Sun Sep 25, 2016 9:39 pm
Forum: Empirical & Molecular Formulas
Topic: Calculating Molecular and Empirica Formulas
Replies: 5
Views: 880

Re: Calculating Molecular and Empirica Formulas

I've read in a few different sources that it is acceptable to round to whole numbers when the number calculated is within one tenth of a whole number. If it is not, the ratio values should be multiplied by some number that will bring all of the values to whole numbers. That being said, 4.87 is a dif...

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