Search found 16 matches

by david_li3H
Sat Mar 18, 2017 1:26 pm
Forum: *Amines
Topic: Chapter 2 #35 and #44
Replies: 2
Views: 568

Re: Chapter 2 #35 and #44

I believe that the one is extra information aka the one could be on both molecules or none.
by david_li3H
Thu Mar 02, 2017 1:06 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7564
Views: 1010738

Re: Post All Chemistry Jokes Here

v
by david_li3H
Thu Feb 23, 2017 12:44 pm
Forum: Second Order Reactions
Topic: Limiting Step
Replies: 7
Views: 453

Re: Limiting Step

The slow step is always the limiting step.
by david_li3H
Sun Feb 19, 2017 12:38 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Intermediates in Reactions
Replies: 2
Views: 206

Re: Intermediates in Reactions

I'm not exactly sure, but I think that we assume that the ratio of concentration from reactant to intermediate or intermediate to product is constant (everything is relative to each other), not that the intermediate has a constant concentration.
by david_li3H
Sun Feb 12, 2017 4:28 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Oxidation Numbers
Replies: 4
Views: 449

Oxidation Numbers

Hi! I'm not sure if oxidation numbers is on the midterm (I don't remember Lavelle talking about it but I remember at discussion my TA asking a question about it so maybe I missed something?), but I'd like to ask a question on it anyways. In a compound, is O always going to be -2, and H +1, or can it...
by david_li3H
Mon Jan 30, 2017 6:07 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: ATP and endothermic/exothermic
Replies: 1
Views: 454

Re: ATP and endothermic/exothermic

Hi
I pretty sure that the phosphate that shoots of the ATP binds to something else, and the energy released to create that bond is greater than the energy needed to break the bond between ADP and P
by david_li3H
Sun Jan 22, 2017 10:28 pm
Forum: Phase Changes & Related Calculations
Topic: 8.39
Replies: 3
Views: 420

Re: 8.39

You need to first convert the ice at 0 C to water at 0 C, then heat up the water to 20 C
by david_li3H
Tue Jan 17, 2017 1:27 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Systems Chemistry
Replies: 1
Views: 136

Systems Chemistry

Hi! There was a question that my TA asked but I still don't really understand the answer. The internal energy of the system is 982kJ and the system absorbs 492kJ a) Was work done by or on the system? I thought that, because the system absorbed energy, that the work was done by the system, but the an...
by david_li3H
Sat Nov 26, 2016 8:57 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7564
Views: 1010738

Re: Post All Chemistry Jokes Here

If H2O is water, what is H2O4?

Bathing, drinking, swimming, washing...
by david_li3H
Sun Nov 20, 2016 8:54 pm
Forum: Lewis Acids & Bases
Topic: Lewis Acids & Bases vs Bronsted Acids & Bases
Replies: 2
Views: 427

Re: Lewis Acids & Bases vs Bronsted Acids & Bases

A tip I had when memorizing these
Their roles kinda flip (acid from acceptor to doner, and vice versa for base), which make sense, as protons and electrons are the opposite (strictly charge speaking) of each other
by david_li3H
Sun Nov 13, 2016 4:22 pm
Forum: Naming
Topic: Oxidation Numbers
Replies: 1
Views: 199

Re: Oxidation Numbers

Yes. It can be found by comparing the charge of the cation to the metal.
by david_li3H
Sun Nov 06, 2016 9:16 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Boron M.O. and Bond Order?
Replies: 1
Views: 288

Boron M.O. and Bond Order?

Can someone help explain to me how B2 has a bond order of 1 from the M.O. diagram but can form (as far as I could google and understand), single, double, and triple bonds with itself?
by david_li3H
Tue Oct 25, 2016 5:58 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 1
Views: 269

Re: Electron Configuration

Ag, like Cu above it, follow the rule that a half filled shell is more stable than a 9/10 filled shell, causing the s to be half fulled and the d fully filled, instead of the d 9/10 filled and the s fully filled. I believe that the elements are in the same groups as Cr and Cu follow this rule. As fo...
by david_li3H
Mon Oct 24, 2016 12:39 pm
Forum: Student Social/Study Group
Topic: Courtside Study Group
Replies: 1
Views: 440

Re: Courtside Study Group

Down!
by david_li3H
Sun Oct 09, 2016 8:04 pm
Forum: Empirical & Molecular Formulas
Topic: Question on #9 from Quiz 1 Preparation Fall 2015 [ENDORSED]
Replies: 1
Views: 325

Re: Question on #9 from Quiz 1 Preparation Fall 2015 [ENDORSED]

I think you may have rounded a bit too much
I, like you got C and O as my lowest numbers as 3.28, and H as 7.88. However, when you divide 7.88/3.28, you get 2.39 which, when approximated to 2.4, you can multiply by 5 to get 5:5:12 ratio of C:O:H ratio, which conveniently is the right molar mass
by david_li3H
Fri Sep 30, 2016 1:44 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7564
Views: 1010738

Re: Chemistry Jokes

Don't ever think you don't matter

...because everything is matter

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