Search found 23 matches

by Wenqian_Deng_1L
Sun Mar 19, 2017 11:18 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7345
Views: 826333

Re: Post All Chemistry Jokes Here

Why do aromatics belong in the nuthouse?

Because they are CYCLO. hahahahahah rip lol.
by Wenqian_Deng_1L
Sun Mar 19, 2017 11:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 200
Views: 45913

Re: Saying Thank You to Dr. Lavelle

Dr. Lavelle, Thank you for being such a superb and caring professor! The hours of preparation and organization of the lectures, course readers, and all of the resources is greatly appreciated. I came to college not looking forward to taking chemistry courses because in high school, AP chemistry neve...
by Wenqian_Deng_1L
Sun Mar 19, 2017 10:58 pm
Forum: *Nucleophilic Substitution
Topic: Question 5 on the 2013 final
Replies: 2
Views: 456

Re: Question 5 on the 2013 final

And since this is not an addition reaction, it must be a SN2 (bimolecular nucleophilic substitution) reaction, because that's the only two reactions we've gone over in the course reader.
by Wenqian_Deng_1L
Sun Mar 19, 2017 10:55 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalyst
Replies: 16
Views: 1170

Re: Catalyst

Yes, @kira, if we have a reactant that shows up as a final product, we know it is a catalyst because it was not an intermediate that was "used up" in the reaction.
by Wenqian_Deng_1L
Sun Feb 26, 2017 10:38 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow Reaction
Replies: 11
Views: 694

Re: Slow Reaction

When given a two chemical reactions, and we know that one is slow and the other is fast, the problem should either give us clues to determining which is which. For example, the problem could say that the equilibrium constant (k1) of one reaction is slower than the equilibrium constant (k2) of the ot...
by Wenqian_Deng_1L
Sun Feb 26, 2017 10:31 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Changes in both volume and temp [ENDORSED]
Replies: 5
Views: 603

Re: Changes in both volume and temp [ENDORSED]

I think the problem would state that the reaction will occur at constant temperature so that we know which equation to use.
by Wenqian_Deng_1L
Sun Feb 26, 2017 10:29 pm
Forum: Zero Order Reactions
Topic: Detail in the Rate Laws
Replies: 2
Views: 296

Re: Detail in the Rate Laws

What about when we're asked to find the temperature of a first order reaction? When we switch the first order integrated rate law to solve for temperature, the negative sign of the rate constant (K), disappears. Am I doing algebra wrong or does it just conveniently cancels itself somehow?
by Wenqian_Deng_1L
Sun Feb 26, 2017 10:24 pm
Forum: General Rate Laws
Topic: Catalyst
Replies: 3
Views: 397

Re: Catalyst

Does changing the temperature also affect the catalyst, which then affects the activation energy and the rate constant?
by Wenqian_Deng_1L
Mon Feb 06, 2017 11:52 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Number of mols to use in the equation [ENDORSED]
Replies: 3
Views: 406

Re: Number of mols to use in the equation [ENDORSED]

Does this mean that we would still need to identify the oxidation states of each element?
by Wenqian_Deng_1L
Mon Feb 06, 2017 11:51 am
Forum: Balancing Redox Reactions
Topic: Conductor as an Electrode
Replies: 3
Views: 291

Re: Conductor as an Electrode

It doesn't ALWAYS have to be platinum, the course reader just used Pt as an example.
by Wenqian_Deng_1L
Sun Jan 29, 2017 12:58 am
Forum: Phase Changes & Related Calculations
Topic: Derivations
Replies: 21
Views: 2045

Re: Derivations

My TA reviewed the equations sheet that will be given to us for the quiz and he said that almost all the equations we need are on the sheet. The only equation we need to memorize is the one that calculates work when it's a reversible isothermal reaction, which is w = -nRT ln(V2/V1)
by Wenqian_Deng_1L
Sun Dec 04, 2016 9:36 pm
Forum: Ideal Gases
Topic: Chemical equilibrium
Replies: 4
Views: 610

Re: Chemical equilibrium

YUP to all the explanations above. When an equation is at equilibrium, it just means that the forward reaction is the same rate as the reverse reaction, and both products and reactants are still being produced.
by Wenqian_Deng_1L
Sun Dec 04, 2016 9:29 pm
Forum: *Biological Importance of Buffer Solutions
Topic: Heisenberg-Hasselbach
Replies: 2
Views: 534

Re: Heisenberg-Hasselbach

Do we use the Heisenberg-Hasselbach equation only when we are given a buffer solution problem? Or does it work when you just have all the information to plug in?
by Wenqian_Deng_1L
Sun Dec 04, 2016 9:27 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: What do we do if one atom has an atomic number below 8 and the other has an atomic number above 8?
Replies: 2
Views: 322

Re: What do we do if one atom has an atomic number below 8 and the other has an atomic number above 8?

When we have a heteronuclear molecule (z>8 in one atom and z<8 in second atom), then we stick with the z<8 MO diagram. At least that's what the TA told us.
by Wenqian_Deng_1L
Sun Dec 04, 2016 9:23 pm
Forum: Conjugate Acids & Bases
Topic: What does a conjugate acid/base do? [ENDORSED]
Replies: 4
Views: 813

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

No I don't think so. However, usually when there's a strong conjugate acid/base, the "second step" of the equation involves the conjugate acid/base to take a proton from water and reform into it's original base/acid, and making the solution either basic or acidic.
by Wenqian_Deng_1L
Sun Dec 04, 2016 9:17 pm
Forum: Polyprotic Acids & Bases
Topic: Indicators
Replies: 3
Views: 664

Re: Indicators

I don't think we need to memorize the type of indicators since they'll be listed for us, like how it was in one of the practice final exams.
by Wenqian_Deng_1L
Sun Dec 04, 2016 9:15 pm
Forum: Naming
Topic: Bis
Replies: 3
Views: 551

Re: Bis

So when do we use bis-, tris-, tetrakis-, pentakis-, etc?
by Wenqian_Deng_1L
Sun Dec 04, 2016 9:13 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constants for Various Reactions
Replies: 2
Views: 359

Re: Equilibrium Constants for Various Reactions

All the equilibrium constants will be given to us in during the test, so we don't have to memorize them! (:
by Wenqian_Deng_1L
Sun Dec 04, 2016 9:11 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Duality of the electron
Replies: 2
Views: 562

Re: Duality of the electron

Also Shrodinger's wave equation shows that electrons also have wavelike properties.
by Wenqian_Deng_1L
Sun Dec 04, 2016 9:00 pm
Forum: Lewis Acids & Bases
Topic: Common Acids and Bases
Replies: 3
Views: 599

Re: Common Acids and Bases

But we do need to know that Kw = 10^-14.
by Wenqian_Deng_1L
Sun Dec 04, 2016 8:50 pm
Forum: Hybridization
Topic: Polar/nonpolar [ENDORSED]
Replies: 14
Views: 1250

Re: Polar/nonpolar [ENDORSED]

So does that mean we have to draw the Lewis structure of the molecule to see if it has a dipole moment?
by Wenqian_Deng_1L
Sun Dec 04, 2016 8:46 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: What is MO theory for? [ENDORSED]
Replies: 20
Views: 6562

Re: What is MO theory for? [ENDORSED]

For heteronuclear molecules (like NO), we always stick with the MO diagram for z<8. That's what the TA told us when we went his review.
by Wenqian_Deng_1L
Thu Oct 06, 2016 11:13 pm
Forum: Photoelectric Effect
Topic: Wavelength vs. Photons [ENDORSED]
Replies: 5
Views: 579

Re: Wavelength vs. Photons [ENDORSED]

@Joanne I think we have to take into account that it's the ENERGY of the photons that are ejecting the electrons from the metal atoms in the photoelectric effect. So in that case, light is acting as photon particles, not as waves. Also, the equation that is related to the photoelectric effect measur...

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