Search found 85 matches
- Sun Mar 08, 2020 9:24 pm
- Forum: Administrative Questions and Class Announcements
- Topic: TesT 2
- Replies: 3
- Views: 286
TesT 2
when do test 2 results come out
- Sun Mar 08, 2020 9:24 pm
- Forum: Administrative Questions and Class Announcements
- Topic: HW10
- Replies: 3
- Views: 397
HW10
do we have hw due week 10?
- Sun Mar 08, 2020 9:22 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 363937
Re: Final Jitters
for me a good self care break helps calm the nerves
- Sun Mar 08, 2020 9:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student - Part II [ENDORSED]
- Replies: 298
- Views: 264861
Re: Advice from a Medical Student - Part II [ENDORSED]
This is great hearing what med school is actually like!!
- Sun Mar 08, 2020 9:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Excellence in Chemistry Award!
- Replies: 27
- Views: 10018
Re: Excellence in Chemistry Award!
Congrats!!
- Sun Mar 01, 2020 3:36 pm
- Forum: General Rate Laws
- Topic: HW 9 question 7A.3
- Replies: 2
- Views: 299
HW 9 question 7A.3
Ethene is a component of natural gas, and its combustion has been thoroughly studied. At a certain temperature and pressure, the unique rate of the combustion reaction C2H4(g)1 3 O2(g) S 2 CO2(g) 1 2 H2O(g) is 0.44 mol?L21 ?s21. (a) What is the rate at which oxygen reacts? (b) What is the rate of fo...
- Sun Mar 01, 2020 3:35 pm
- Forum: General Rate Laws
- Topic: 7A.1 textbook question
- Replies: 2
- Views: 842
7A.1 textbook question
7A.1 Complete the following statements relating to the production of ammonia by the Haber process, for which the overall reaction is N2(g) 1 3 H2(g) S 2 NH3(g). (a) The rate of consumption of N2 is ______________ times the rate of consumption of H2. (b) The rate of formation of NH3 is ______________...
- Sun Mar 01, 2020 3:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem community posts
- Replies: 3
- Views: 319
Chem community posts
For the 5 posts every week on chem community, is it a hard deadline every week or is it more general like if you have 50 posts overall at the end?
- Sun Mar 01, 2020 3:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: HW 9
- Replies: 5
- Views: 434
HW 9
what topics can we do for test 9?
- Sun Mar 01, 2020 3:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 2
- Views: 266
Test 2
how much is test 2 worth for your overall grade (is it weighted higher than test 1?)
- Mon Feb 24, 2020 1:05 am
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2 info
- Replies: 8
- Views: 678
Test 2 info
Is test 2 cumulative?
What topics is it on
What topics is it on
- Mon Feb 24, 2020 1:04 am
- Forum: Administrative Questions and Class Announcements
- Topic: Thermo
- Replies: 3
- Views: 291
Thermo
Does anyone have good thermo study techniques? Or the best resource to help study it?
- Mon Feb 24, 2020 1:03 am
- Forum: Administrative Questions and Class Announcements
- Topic: Study guide
- Replies: 7
- Views: 611
Study guide
Does anyone have an old (or recent) chem 14b study guide that’s been passed down to them?
- Mon Feb 24, 2020 1:02 am
- Forum: Administrative Questions and Class Announcements
- Topic: Hw 8
- Replies: 10
- Views: 705
Hw 8
What topics can we do for hw 8
- Mon Feb 24, 2020 1:01 am
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 5
- Views: 477
Test 2
Did test 2 get moved to week 9?
- Sun Feb 16, 2020 9:26 pm
- Forum: General Science Questions
- Topic: Studying
- Replies: 67
- Views: 3861
Studying
What’s the best way to study for chem 14b
- Sun Feb 16, 2020 9:24 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Isolated versus closed
- Replies: 7
- Views: 626
Isolated versus closed
What’s the difference between isolated and closed systems
- Sun Feb 16, 2020 9:22 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Work
- Replies: 14
- Views: 1016
Work
When is work positive/negative
- Sun Feb 16, 2020 9:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 11
- Views: 754
Test 2
Is test 2 going to be cumulative
- Sun Feb 16, 2020 9:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: HW7
- Replies: 14
- Views: 826
HW7
What sections should we do for HW7
- Sun Feb 09, 2020 10:59 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 4J.7
- Replies: 2
- Views: 220
4J.7
Calculate the standard reaction entropy, enthalpy, and Gibbs free energy for each of the following reactions from data in Appendix 2A: (a) the decomposition of hydrogen peroxide: 2 H2O2(l) ¡ 2 H2O(l) 1 O2(g)
- Sun Feb 09, 2020 10:59 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 4J.5
- Replies: 1
- Views: 177
4J.5
Write a balanced chemical equation for the formation reaction of (a) NH3(g); (b) H2O(g); (c) CO(g); (d) NO2(g). For each reaction, determine DH8, DS, and DG from data in Appendix 2A.
- Sun Feb 09, 2020 10:58 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: HW help 4J
- Replies: 1
- Views: 157
HW help 4J
can someone help with this question from the homework please:
Calculate the change in molar Gibbs free energy for the process NH3(l) S NH3(g) at 1 atm and (a) 215.0 8C; (b) 245. 8C (see Tables 4C.1 and 4F.1). In each case, indicate whether vaporization would be spontaneous.
Calculate the change in molar Gibbs free energy for the process NH3(l) S NH3(g) at 1 atm and (a) 215.0 8C; (b) 245. 8C (see Tables 4C.1 and 4F.1). In each case, indicate whether vaporization would be spontaneous.
- Sun Feb 09, 2020 10:57 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Exothermic reactions
- Replies: 5
- Views: 310
Exothermic reactions
Why are so many exothermic reactions spontaneous?
- Sun Feb 09, 2020 10:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 12
- Views: 637
Midterm
what time is the midterm on Wednesday? Is it during class or later in the day like 14A?
- Sun Feb 09, 2020 10:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm dates
- Replies: 11
- Views: 506
Re: Midterm dates
there's no topic 5 on the midterm
- Sun Feb 09, 2020 10:53 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Accessing the E-textbook [ENDORSED]
- Replies: 125
- Views: 32392
- Sun Feb 02, 2020 9:39 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Step Up Sessions
- Replies: 71
- Views: 7000
Re: Step Up Sessions
for anyone that's been, have you found them helpful/how is the pace of the step-up sessions
- Sun Feb 02, 2020 9:37 pm
- Forum: Administrative Questions and Class Announcements
- Topic: slides
- Replies: 8
- Views: 332
slides
is there anywhere where lavelle posts his slides/lectures?
- Sun Feb 02, 2020 9:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: HW 5
- Replies: 3
- Views: 130
HW 5
which topics should we do the homework from
- Sun Feb 02, 2020 9:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm dates
- Replies: 11
- Views: 506
Midterm dates
what topics will the midterm cover/ is it cumulative or just the stuff since test 1
- Sun Feb 02, 2020 9:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: TeST 1
- Replies: 3
- Views: 160
TeST 1
when do we get the test 1 results
- Sun Jan 19, 2020 8:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm dates
- Replies: 1
- Views: 134
Midterm dates
what date/time is the midterm?
- Sun Jan 19, 2020 8:20 pm
- Forum: General Science Questions
- Topic: Acids
- Replies: 3
- Views: 155
Acids
what's the difference between a bronsted acid and a lewis acid
- Sun Jan 19, 2020 8:19 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6A . 3
- Replies: 1
- Views: 150
6A . 3
can someone explain this question please 6A.3 Write the chemical equations for the proton transfer equilibria of the following acids in aqueous solution and identify the conjugate acid–base pairs in each case: (a) H2SO4; (b) C6H5NH3 1, anilinium ion; (c) H2PO4 2; (d) HCOOH, formic acid; (e) NH2NH3 1...
- Sun Jan 19, 2020 8:17 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm and final
- Replies: 6
- Views: 262
Midterm and final
are the midterms/tests and final cumulative?
- Sun Jan 19, 2020 8:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: TeST 1
- Replies: 5
- Views: 241
TeST 1
What are the topics for test 1?
- Sun Jan 12, 2020 1:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 1 date
- Replies: 4
- Views: 278
Test 1 date
when is test 1?
- Sun Jan 12, 2020 1:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: General HW question
- Replies: 9
- Views: 410
General HW question
our homeworks are graded on completion, not correctness, right?
- Sun Jan 12, 2020 1:31 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Homework question
- Replies: 1
- Views: 121
Homework question
can someone help me with this homework question 5G.9 A sample of ozone, O3, amounting to 0.10 mol, is placed in a sealed container of volume 1.0 L and the reaction 2 O3(g) S 3 O2(g) is allowed to reach equilibrium. Then 0.50 mol O3 is placed in a second container of volume 1.0 L at the same temperat...
- Sun Jan 12, 2020 1:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 1
- Replies: 2
- Views: 160
Test 1
which topics is test 1 on
- Sun Jan 12, 2020 1:28 pm
- Forum: Administrative Questions and Class Announcements
- Topic: HW 2
- Replies: 7
- Views: 261
HW 2
are we still just doing chemical equilibrium questions for homework 2?
- Sun Dec 08, 2019 9:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL
- Replies: 7
- Views: 596
FINAL
how did everyone find the final?
- Sun Dec 08, 2019 9:15 pm
- Forum: Biological Examples
- Topic: heme group
- Replies: 4
- Views: 279
heme group
whats a heme group
- Sun Dec 08, 2019 9:14 pm
- Forum: Administrative Questions and Class Announcements
- Topic: curve
- Replies: 8
- Views: 660
curve
does anyone know how the grading is going to work- will there be a curve/how curved?
- Sun Dec 08, 2019 9:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 14A FInal
- Replies: 6
- Views: 516
14A FInal
does anyone know when the final grades are going to be posted?
- Sun Dec 08, 2019 9:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 554706
Re: Saying Thank You to Dr. Lavelle
Dr. Lavelle, Thank you so much for such a great quarter! Your lectutres are always both very informative but also hilarious. I have thoroughly enjoyed this class, and having not taken chem since sophmore year of high school, I now feel like I'm finally getting back into it. Can't wait to take 14B wi...
- Sun Nov 24, 2019 9:15 pm
- Forum: General Science Questions
- Topic: Ligand question
- Replies: 2
- Views: 230
Ligand question
Can someone explain what a ligand is
- Sun Nov 24, 2019 9:06 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AXE Format
- Replies: 34
- Views: 1250
Re: AXE Format
You don’t have to write the 1 but if you prefer to then you can
- Sun Nov 24, 2019 9:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Curve
- Replies: 3
- Views: 242
Curve
Does anyone know if he’s going to curve the class
- Sun Nov 24, 2019 8:57 pm
- Forum: General Science Questions
- Topic: Week 9 HW
- Replies: 6
- Views: 476
Week 9 HW
Does anyone know what the week 9 HW topics are?
- Sun Nov 24, 2019 8:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 7
- Views: 285
Test 2
Does anyone know when the test two grades will be posted
- Sun Nov 17, 2019 9:59 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing molecules
- Replies: 12
- Views: 735
Drawing molecules
Are we going to have to draw out the molecules?
- Sun Nov 17, 2019 9:58 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSPER
- Replies: 7
- Views: 558
VSPER
can someone briefly explain VSEPR
- Sun Nov 17, 2019 9:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2 Review Sessions?
- Replies: 6
- Views: 374
Re: Test 2 Review Sessions?
are step-up sessions different to the other sessions?
- Sun Nov 17, 2019 9:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 8 HW
- Replies: 4
- Views: 311
Week 8 HW
What topics can we do questions from for the week 8 HW
- Sun Nov 17, 2019 9:50 pm
- Forum: Student Social/Study Group
- Topic: Test 2
- Replies: 5
- Views: 350
Re: Test 2
do you know what topics the test will cover?
- Sun Nov 17, 2019 9:44 pm
- Forum: Student Social/Study Group
- Topic: Test 2
- Replies: 5
- Views: 350
Test 2
Does anyone know when test 2 is going to be?
- Sun Nov 03, 2019 10:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: study guide
- Replies: 2
- Views: 247
study guide
does anyone know if theres gonna be a study guide that he gives us?
- Sun Nov 03, 2019 10:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: slides
- Replies: 4
- Views: 376
slides
this might have already been answered but does anyone know if he posts the lecture slides and if so where?
- Sun Nov 03, 2019 10:31 pm
- Forum: Bond Lengths & Energies
- Topic: Why Are Double Bonds Shorter
- Replies: 16
- Views: 6193
Re: Why Are Double Bonds Shorter
single bonds are longer because there is less attraction to the nuclei, whereas double bonds have a greater pull and thus are pulled closer making them shorter
- Sun Nov 03, 2019 10:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: HW 5
- Replies: 1
- Views: 143
HW 5
What sections can we do questions from for the homework this week
- Sun Nov 03, 2019 10:24 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: HW question 1D.11
- Replies: 5
- Views: 192
Re: HW question 1D.11
thanks guys!
- Sun Nov 03, 2019 10:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 11
- Views: 561
Re: Midterm
so are we going to have class like normal on wednesday?
- Sun Nov 03, 2019 10:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterms
- Replies: 6
- Views: 436
Midterms
There is only one midterm right?
- Sun Oct 27, 2019 11:56 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: HW question 1D.13
- Replies: 1
- Views: 91
HW question 1D.13
can anyone help with this question: (a) How many values of the quantum number l are possible when n 5 7? (b) How many values of ml are allowed for an electron in a 6d-subshell? (c) How many values of ml are allowed for an electron in a 3p-subshell? (d) How many subshells are there in the shell with ...
- Sun Oct 27, 2019 11:55 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: HW question 1D.11
- Replies: 5
- Views: 192
HW question 1D.11
can someone help me with this question:
How many orbitals are in subshells with l equal to (a) 0; (b) 2; (c) 1; (d) 3?
How many orbitals are in subshells with l equal to (a) 0; (b) 2; (c) 1; (d) 3?
- Sun Oct 27, 2019 11:48 pm
- Forum: Trends in The Periodic Table
- Topic: Homework #4
- Replies: 5
- Views: 235
Re: Homework #4
I thought we had done a little bit on chemical bonds, but maybe I'm wrong?
- Sun Oct 27, 2019 11:45 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configurations
- Replies: 3
- Views: 262
Electron Configurations
Does anyone know if we are going to have to be able to physically draw the different shells or if we just need to know their different energy levels?
- Sun Oct 27, 2019 11:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: HW 4
- Replies: 2
- Views: 111
HW 4
does anyone know what topics we can do for HW 4?
- Sun Oct 20, 2019 10:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Accessing the E-textbook [ENDORSED]
- Replies: 125
- Views: 32392
Re: Accessing the E-textbook [ENDORSED]
I bought my e-textbook as a rental on Amazon, if you download the kindle app this might be a good resource :)
- Sun Oct 20, 2019 10:17 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem revision help
- Replies: 2
- Views: 192
Chem revision help
Does anyone know any good, concise youtube channels that cover the topics on the 14 series that would be useful for studying/brushing up on all of the material?
- Sun Oct 20, 2019 10:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 11
- Views: 561
Midterm
Does anyone know when the midterm will be and what the layout/structure of it will be like (how many questions, what topics etc)?
- Sun Oct 20, 2019 10:11 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Multi-electron atoms
- Replies: 7
- Views: 313
Multi-electron atoms
What is a multi-electron atom, don't all atoms have multiple electrons except for H?
- Sun Oct 20, 2019 10:09 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Writing Electron configurations
- Replies: 2
- Views: 125
Writing Electron configurations
how do you know which element to put in the square brackets when writing out the configurations, for example:
Sc is [Ar] 3d^1 4s^2
how do you decide that Argon goes in the brackets?
Sc is [Ar] 3d^1 4s^2
how do you decide that Argon goes in the brackets?
- Sun Oct 13, 2019 8:17 pm
- Forum: Significant Figures
- Topic: Tests and Significant Figures
- Replies: 6
- Views: 352
Tests and Significant Figures
Normally I try to use the same amount of significant figures as the question in my answer, but sometimes the question has different amounts of significant figures for different values/measurements, so i was just wondering if there's a standard that Lavelle has for sig figs and how many that would be?
- Sun Oct 13, 2019 8:14 pm
- Forum: Balancing Chemical Reactions
- Topic: Any Easy Way
- Replies: 10
- Views: 597
Re: Any Easy Way
it's definitely best to start with the least occuring element and go from there, but also if you ever want to check your work you can use this helpful website:
http://www.endmemo.com/chem/balancer.php
http://www.endmemo.com/chem/balancer.php
- Sun Oct 13, 2019 8:08 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: HW question 1A.15
- Replies: 2
- Views: 141
HW question 1A.15
I was struggling with this question during the homework, can anyone help? 1A.15 In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral ...
- Sun Oct 13, 2019 8:07 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: HW question 1A.11
- Replies: 1
- Views: 142
HW question 1A.11
can someone help explain how you would do this question: 1A.11 In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series (for example, Balmer series or Lyman series, as shown in Fig. 1A.10). What is common to the lines within a series that makes gro...
- Sun Oct 13, 2019 8:03 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Angstrom's Constant
- Replies: 5
- Views: 367
Re: Angstrom's Constant
Yes for example when converting from 1 angstrom which is 1*10^-10m to mm you would multiply by 10^3 which would give you 10^-7
- Sat Oct 05, 2019 12:56 pm
- Forum: SI Units, Unit Conversions
- Topic: Homework
- Replies: 9
- Views: 505
Re: Homework
You could always write in pencil and go over in pen just to be safe too!
- Sat Oct 05, 2019 12:55 pm
- Forum: Balancing Chemical Reactions
- Topic: H 7 a.
- Replies: 3
- Views: 160
Re: H 7 a.
Also if you ever need to check your equations are correct you can use this helpful website:
http://www.endmemo.com/chem/balancer.php
http://www.endmemo.com/chem/balancer.php
- Sat Oct 05, 2019 12:53 pm
- Forum: Balancing Chemical Reactions
- Topic: H7
- Replies: 3
- Views: 251
H7
Is there an easy way to know how many atoms should be in each formula?
- Sat Oct 05, 2019 12:51 pm
- Forum: Balancing Chemical Reactions
- Topic: Homework Question H.5 (c)
- Replies: 2
- Views: 177
- Sat Oct 05, 2019 12:48 pm
- Forum: Balancing Chemical Reactions
- Topic: H.5
- Replies: 2
- Views: 194
H.5
for part c) Mg(N3)2(s) + H2O(l) = Mg(OH)2(aq) + NH3(aq)
I kept trying to balance but I couldn't figure it out, can anyone help?
I kept trying to balance but I couldn't figure it out, can anyone help?