Search found 30 matches
- Thu Mar 16, 2017 12:43 am
- Forum: General Science Questions
- Topic: Final
- Replies: 9
- Views: 2194
Re: Final
6 questions!! It's all in that finals post that disappeared somewhere
- Wed Mar 08, 2017 2:08 pm
- Forum: *Alkanes
- Topic: Quiz 3 Drop -- do I show up? [ENDORSED]
- Replies: 3
- Views: 813
Re: Quiz 3 Drop -- do I show up? [ENDORSED]
I would email your TA. It wouldn't hurt to take it for the practice.
- Sat Mar 04, 2017 4:51 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Quiz 3 [ENDORSED]
- Replies: 14
- Views: 1927
Re: Quiz 3 [ENDORSED]
The kinetics stuff should only be like the last couple concepts like the Arrhenius equation.
- Mon Feb 27, 2017 2:53 pm
- Forum: Biological Examples
- Topic: Enzymes
- Replies: 13
- Views: 1692
Re: Enzymes
Heterogenous enzymes exist as well. Whenever it catalyzes a reaction and is in a different state from the reactant then it's heterogenous.
- Sun Feb 26, 2017 8:30 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: determining the catalyst
- Replies: 4
- Views: 892
Re: determining the catalyst
You can tell by looking at the steps and identifying which molecule didn't change. Intermediates are like "in between" molecules so their structure changes. But catalysts don't chemically change in a reaction. If you see that they're the same on both the reactant and product side of a reac...
- Sat Feb 25, 2017 11:24 pm
- Forum: Student Social/Study Group
- Topic: Chem 14C Lecture 1
- Replies: 3
- Views: 850
Re: Chem 14C Lecture 1
Are we still able to switch this late into the quarter?
- Fri Feb 24, 2017 10:58 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pre-equilibrium approach
- Replies: 1
- Views: 403
Re: Pre-equilibrium approach
I think it will be given for the most part. And if not, the way you describe how to approach the rate law should work out as well too.
- Thu Feb 16, 2017 1:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2017
- Replies: 160
- Views: 23670
Re: Quiz 2 Winter 2017
Does quiz 2 just cover up to the end of kinetics? Is it cumulative?
- Sun Feb 12, 2017 11:17 pm
- Forum: Phase Changes & Related Calculations
- Topic: Equation to find standard reduction potentials?
- Replies: 2
- Views: 626
Re: Equation to find standard reduction potentials?
I believe they should all be given for the most part.
- Sun Feb 05, 2017 8:09 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1
- Replies: 5
- Views: 1023
Re: Quiz 1
They don't post but I heard that they're passing them back out after lecture on Wednesday I believe.
- Wed Feb 01, 2017 2:24 pm
- Forum: Calculating Work of Expansion
- Topic: When to Use Different Formulas for Work
- Replies: 2
- Views: 579
Re: When to Use Different Formulas for Work
It basically boils down to irreversible reactions which is the first equation and reversible ones which is the second.
- Mon Jan 30, 2017 5:59 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: How to interpret ∆H
- Replies: 2
- Views: 730
Re: How to interpret ∆H
When it refers to 1 mol of reactants I believe it has a different notation. (the delta H with the little circle). Delta H on its own is just the enthalpy of the reaction as a whole.
- Thu Jan 26, 2017 5:31 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Practice Quiz
- Replies: 1
- Views: 459
Re: Practice Quiz
I thought you solved for the change in pressure and the change in volume both for the two entropies and they can be put together?
- Tue Jan 17, 2017 1:58 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Values Given on Exams?
- Replies: 2
- Views: 598
Re: Values Given on Exams?
He said he'd give it to us, but since you have it memorized you're all good.
- Tue Jan 17, 2017 1:11 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase Change Question
- Replies: 1
- Views: 481
Re: Phase Change Question
It has to do with the bonds in each phase. Solid to liquid, you're just loosening the bonds to the point that they can slide next to each other (liquid). However, it requires more energy to vaporize than to melt because you're completely breaking apart the bonds in water which requires much more ene...
- Fri Dec 02, 2016 9:40 pm
- Forum: Lewis Acids & Bases
- Topic: Strong Acids and Bases
- Replies: 1
- Views: 498
Re: Strong Acids and Bases
I believe you still use double since it's still an equilibrium reaction. At least this is what my TA said.
- Sun Nov 27, 2016 6:41 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Sig figs in calculations for pH and pOH
- Replies: 2
- Views: 595
Re: Sig figs in calculations for pH and pOH
It always seems to round off to three sig figs for me. But not sure, commenting on this post to follow because I have the same question.
Re: Mono
It is only really necessary when you're describing how many bonds it can make. ex) Monodentate
- Wed Nov 16, 2016 12:31 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Quiz 3 Prep Fall 2014 #10
- Replies: 2
- Views: 729
Re: Quiz 3 Prep Fall 2014 #10
I did that but I still end up with a value for x that is too small. What numbers did you have after doing PV=nRT?
- Tue Nov 08, 2016 1:18 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Homework 17.33
- Replies: 8
- Views: 1553
Re: Homework 17.33
The way I've been doing it and how the solution manual shows you is to do a basic sketch of the structure and then you look at which atoms have lone pairs. Lone pairs means its free to bind to another atom so you count up the atoms with lone pairs and that corresponds to what type of polydentate it ...
- Sat Nov 05, 2016 3:48 pm
- Forum: Student Social/Study Group
- Topic: Midterm over!!
- Replies: 11
- Views: 2341
Re: Midterm over!!
All the naming material that we're covering now and molecular orbital theory is what my TA told me.
- Thu Oct 27, 2016 6:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MidTerm Review [ENDORSED]
- Replies: 4
- Views: 1110
Re: MidTerm Review [ENDORSED]
He said up to chapter 4. Basically fundamentals to chapter 4.
- Thu Oct 20, 2016 10:56 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Excited vs. Ground State [ENDORSED]
- Replies: 1
- Views: 557
Re: Excited vs. Ground State [ENDORSED]
Ground state just means that the electron is in the lowest energy form possible. That means that the electron is in the orbital we would normally expect it to be. Excited states are when electrons are not in the correct orbital. So, in 39 for example, the carbon is excited because the second 2p elec...
- Thu Oct 13, 2016 8:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Rounding and Accuracy During Tests
- Replies: 4
- Views: 981
Re: Rounding and Accuracy During Tests
Yeah that's true, it just kind of varies from problem to problem. To be honest, your way is probably better but I'm just saying that whichever way you do it, at least the solution manual kind of verifies that you're ok so I wouldn't freak out too much if its confusing you.
- Sat Oct 08, 2016 8:22 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Equation [ENDORSED]
- Replies: 4
- Views: 1028
Re: Rydberg Equation [ENDORSED]
My TA said to always use it because they give partial credit if we at least find the energy of each n level. He said that if we use ryberg's, if we mess up the calculation in any way and get the wrong answer, then the whole thing is wrong and there's no partial credit.
- Fri Oct 07, 2016 4:00 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbital Question [ENDORSED]
- Replies: 3
- Views: 814
Re: Orbital Question [ENDORSED]
What's the difference between the two? I didn't fully understand. Does it just have to do with the spin or something?
- Fri Oct 07, 2016 9:13 am
- Forum: Administrative Questions and Class Announcements
- Topic: Rounding and Accuracy During Tests
- Replies: 4
- Views: 981
Re: Rounding and Accuracy During Tests
From looking at the solutions in the textbook solutions manual and workbook, it constantly wants us to round off to the proper number of sig figs at each step of the problem. If you do that, it's easier to keep track of sig figs from the beginning because you just end up with the smallest number of ...
- Thu Sep 29, 2016 1:09 am
- Forum: Empirical & Molecular Formulas
- Topic: Order of writing ions in a molecule? [ENDORSED]
- Replies: 3
- Views: 810
Re: Order of writing ions in a molecule? [ENDORSED]
I'm not sure if this is correct but I was taught in high school chem that you can generally put them back into the order they were presented to you. I've done some problems from the book and the solution manual generally does the same too.
- Thu Sep 29, 2016 1:05 am
- Forum: Significant Figures
- Topic: Sig Figs. Problem
- Replies: 4
- Views: 1167
Re: Sig Figs. Problem
It's always good to keep track of them as you go. At least look at the numbers you're starting out with and make sure that the sig figs at the beginning of the problem match the end of the problem. However, as you're working along the problem, you can be off in terms of sig figs one or two places an...
- Mon Sep 26, 2016 5:41 pm
- Forum: Student Social/Study Group
- Topic: Hedrick Summit Study Group Chem 14A
- Replies: 29
- Views: 4109
Re: Hedrick Summit Study Group Chem 14A
I would like to join this as well! PM me.