## Search found 85 matches

Sun Mar 08, 2020 9:24 pm
Forum: Administrative Questions and Class Announcements
Topic: TesT 2
Replies: 3
Views: 61

### 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: 99

### HW10

do we have hw due week 10?
Sun Mar 08, 2020 9:22 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 288
Views: 38305

### 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: 225
Views: 17944

### 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: 7033

### 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: 104

### 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: 77

### 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: 122

### 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: 107

### 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: 87

### 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: 249

### Test 2 info

Is test 2 cumulative?
What topics is it on
Mon Feb 24, 2020 1:04 am
Forum: Administrative Questions and Class Announcements
Topic: Thermo
Replies: 3
Views: 77

### 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: 212

### 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: 189

### 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: 170

### Test 2

Did test 2 get moved to week 9?
Sun Feb 16, 2020 9:26 pm
Forum: General Science Questions
Topic: Studying
Replies: 42
Views: 538

### 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: 231

### 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: 385

### 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: 208

### 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: 267

### 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: 60

### 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: 37

### 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: 48

### 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.
Sun Feb 09, 2020 10:57 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Exothermic reactions
Replies: 5
Views: 66

### 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: 208

### 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: 120

### 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: 107
Views: 9161

### Re: Accessing the E-textbook[ENDORSED]

you can also access a lot of free pdf versions of textbooks here:

https://b-ok.org
Sun Feb 02, 2020 9:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Step Up Sessions
Replies: 71
Views: 4678

### 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: 123

### 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: 46

### 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: 120

### 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: 52

### 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: 51

### Midterm dates

what date/time is the midterm?
Sun Jan 19, 2020 8:20 pm
Forum: General Science Questions
Topic: Acids
Replies: 3
Views: 57

### 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: 43

### 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: 92

### 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: 65

### 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: 64

### 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: 117

### 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: 39

### 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: 44

### 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: 100

### 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: 251

### FINAL

how did everyone find the final?
Sun Dec 08, 2019 9:15 pm
Forum: Biological Examples
Topic: heme group
Replies: 4
Views: 167

### heme group

whats a heme group
Sun Dec 08, 2019 9:14 pm
Forum: Administrative Questions and Class Announcements
Topic: curve
Replies: 8
Views: 233

### 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: 205

### 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: 416
Views: 143600

### 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: 64

### 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: 390

### 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: 96

### 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: 176

### 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: 109

### 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: 196

### 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: 263

### 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: 122

### 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: 111

### 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: 136

### 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: 136

### 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: 81

### 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: 117

### 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: 921

### 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: 51

### 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: 103

### 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: 175

### 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: 138

### 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: 33

### 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: 103

### 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?
Sun Oct 27, 2019 11:48 pm
Forum: Trends in The Periodic Table
Topic: Homework #4
Replies: 5
Views: 80

### 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: 100

### 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: 44

### 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: 107
Views: 9161

### 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: 33

### 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: 175

### 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: 91

### 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: 37

### 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?
Sun Oct 13, 2019 8:17 pm
Forum: Significant Figures
Topic: Tests and Significant Figures
Replies: 6
Views: 223

### 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: 347

### 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
Sun Oct 13, 2019 8:08 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: HW question 1A.15
Replies: 2
Views: 88

### 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: 42

### 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: 203

### 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: 242

### 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: 91

### 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
Sat Oct 05, 2019 12:53 pm
Forum: Balancing Chemical Reactions
Topic: H7
Replies: 3
Views: 98

### 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: 74

### Re: Homework Question H.5 (c)

a useful tool to help check if you're correct is:

http://www.endmemo.com/chem/balancer.php
Sat Oct 05, 2019 12:48 pm
Forum: Balancing Chemical Reactions
Topic: H.5
Replies: 2
Views: 79

### 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?