Search found 31 matches

by Jacquelyn Challis 1H
Thu Nov 19, 2020 1:57 pm
Forum: Student Social/Study Group
Topic: Post Midterm Blues
Replies: 67
Views: 422

Re: Post Midterm Blues

Same, looking through my notes after I realized that a bunch of my answers were wrong:( I feel like I made a lot of small mistakes on this one.
by Jacquelyn Challis 1H
Thu Nov 19, 2020 11:13 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: d vs s orbitals
Replies: 6
Views: 25

Re: d vs s orbitals

Got it, thanks!!
by Jacquelyn Challis 1H
Wed Nov 18, 2020 9:50 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: d vs s orbitals
Replies: 6
Views: 25

Re: d vs s orbitals

Just to clarify, when writing electron configurations, would you write 3d or 4s first? I've seen it done both ways and I'm getting confused.
by Jacquelyn Challis 1H
Wed Nov 18, 2020 9:42 pm
Forum: Dipole Moments
Topic: Dipole-Dipole Interactions
Replies: 3
Views: 22

Re: Dipole-Dipole Interactions

Thank you so much!!
by Jacquelyn Challis 1H
Wed Nov 18, 2020 7:42 pm
Forum: Student Social/Study Group
Topic: grade worries
Replies: 87
Views: 510

Re: grade worries

Anyone else keep adding up the points to see how their grade changes every day? Or just me lol.
by Jacquelyn Challis 1H
Wed Nov 18, 2020 7:41 pm
Forum: Dipole Moments
Topic: Dipole-Dipole Interactions
Replies: 3
Views: 22

Dipole-Dipole Interactions

I'm having a hard time understanding some aspects of dipoles as a whole. One thing I'm stuck on is an old sapling question. How do you know this is Dipole-Dipole? Thanks
by Jacquelyn Challis 1H
Wed Nov 18, 2020 4:04 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic & Covalent Character
Replies: 3
Views: 24

Ionic & Covalent Character

I'm reviewing topics in preparation for the midterm, and I know I'm iffy on determining which bonds are more ionic vs more covalent in character. Any tips on how to figure this out? For example, Sapling question 10 from last week lists: Br-F, F-F, Cl-F, Ca-F, K-F and asks you to put them in order fr...
by Jacquelyn Challis 1H
Wed Nov 18, 2020 3:33 pm
Forum: Lewis Structures
Topic: Sapling 9
Replies: 8
Views: 43

Re: Sapling 9

On this same question, it asks for oxidation number of chlorine in the perchlorate ion. What does that mean and how would I find it?
by Jacquelyn Challis 1H
Tue Nov 17, 2020 8:14 pm
Forum: Student Social/Study Group
Topic: Midterm 2
Replies: 3
Views: 38

Re: Midterm 2

So does this mean the midterm will cover up to & including lecture 18?
by Jacquelyn Challis 1H
Sun Nov 15, 2020 7:34 pm
Forum: Lewis Structures
Topic: Sapling weeks 5/6 Question 4
Replies: 6
Views: 40

Re: Sapling weeks 5/6 Question 4

Thank you all very much!!!
by Jacquelyn Challis 1H
Sun Nov 15, 2020 6:44 pm
Forum: Lewis Structures
Topic: Sapling weeks 5/6 Question 4
Replies: 6
Views: 40

Sapling weeks 5/6 Question 4

Okay, I've gotten to the last part of this question where there is a table with bond lengths. I'm not sure what ample & overwhelming bond character mean.
by Jacquelyn Challis 1H
Sun Nov 15, 2020 6:17 pm
Forum: Lewis Structures
Topic: Sapling #4
Replies: 8
Views: 61

Re: Sapling #4

The next part of this question asks: "Which of the Lewis structures would be expected to contribute the least to the overall structure of the carbamate ion?" How would I figure out the answer to this?
by Jacquelyn Challis 1H
Sun Nov 15, 2020 6:12 pm
Forum: Lewis Structures
Topic: Sapling Weeks 5-6 HW Question 3
Replies: 10
Views: 75

Re: Sapling Weeks 5-6 HW Question 3

Hi! I've been trying to go back through the lectures to find the formula for formal charge and I can't find it. Based off this post, I think the formula is: formal charge= valence electrons-( (bonds/2) + lone pairs). Is this correct?
by Jacquelyn Challis 1H
Tue Nov 10, 2020 7:12 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Explaining Electron Configuration
Replies: 4
Views: 15

Re: Explaining Electron Configuration

Hi! I was also struggling to really understand electron configuration, and I found that this link to a Khan Academy video helped a lot: https://www.youtube.com/watch?v=NIwcDnFjj98
by Jacquelyn Challis 1H
Sun Nov 08, 2020 7:50 pm
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 129
Views: 411

Re: Favorite TV shows

My all time favorite is Supernatural on Netflix:) Definitely recommend
by Jacquelyn Challis 1H
Sun Nov 01, 2020 3:59 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Sapling Rydberg Question
Replies: 4
Views: 33

Re: Sapling Rydberg Question

Hi! I had a similar question: Calculate the wavelength, in nanometers, of the spectral line produced when an electron in a hydrogen atom undergoes the transition from the energy level n=6 to the level n=1. My answer is 9.394*10^-8 and I can't figure out why my answer is wrong.
by Jacquelyn Challis 1H
Thu Oct 29, 2020 11:06 am
Forum: Empirical & Molecular Formulas
Topic: Review for Midterm
Replies: 11
Views: 107

Re: Review for Midterm

Regarding the midterm, can I use a graphing calculator or does it need to be scientific? I can't remember if Lavelle told us this info already or not.
by Jacquelyn Challis 1H
Wed Oct 28, 2020 3:53 pm
Forum: Photoelectric Effect
Topic: Sapling Problem #6
Replies: 7
Views: 84

Re: Sapling Problem #6

Okay for this question I got the answers: from 37.61nm to 12370nm and it is telling me that 37.61nm is wrong, but I don't understand why. Any help would be great!
by Jacquelyn Challis 1H
Wed Oct 28, 2020 12:39 pm
Forum: Einstein Equation
Topic: Sapling #5
Replies: 7
Views: 85

Re: Sapling #5

I'm still stuck on this question, I understand the steps but I can't figure out how to find c for the equation E=hc/wavelength?
by Jacquelyn Challis 1H
Sun Oct 25, 2020 10:23 pm
Forum: SI Units, Unit Conversions
Topic: Do I need to do very single textbook question on the syllabus?
Replies: 34
Views: 179

Re: Do I need to do very single textbook question on the syllabus?

I've been finding that the textbook questions are harder than the Sapling questions/ other practice problems Lavelle show us. Is anyone else feeling this?
by Jacquelyn Challis 1H
Sun Oct 25, 2020 10:19 pm
Forum: Properties of Light
Topic: How are you guys studying for the midterm?
Replies: 19
Views: 53

Re: How are you guys studying for the midterm?

Lavelle says in the syllabus that doing the textbook problems, doing the Sapling homework, and completing all the modules on his website should prepare you well for the midterm.
by Jacquelyn Challis 1H
Sun Oct 25, 2020 10:09 pm
Forum: Student Social/Study Group
Topic: review sessions
Replies: 3
Views: 23

Re: review sessions

I think he will probably continue the step up and workshop sessions this week which would probably be some good review before the midterm?
by Jacquelyn Challis 1H
Sun Oct 25, 2020 10:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Where can I buy a webcam for a reasonable price?
Replies: 60
Views: 911

Re: Where can I buy a webcam for a reasonable price?

Does anyone have any good study tips for this midterm? I've been going back over the book questions for review but I'm not sure what else I should be studying.
by Jacquelyn Challis 1H
Sun Oct 25, 2020 10:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Format
Replies: 12
Views: 80

Re: Midterm Format

Does anyone know how many questions will be on the midterm and/or how much time we'll have to complete?
by Jacquelyn Challis 1H
Thu Oct 15, 2020 7:57 pm
Forum: Student Social/Study Group
Topic: Step Up Sessions
Replies: 9
Views: 81

Re: Step Up Sessions

Hey, I think I need to start attending step up sessions, do I have to sign up for them? Or do I just go to the zoom link during that time? From what I've heard, you do practice problems... is there a packet I would need to have ready/print beforehand?
by Jacquelyn Challis 1H
Thu Oct 15, 2020 7:39 pm
Forum: SI Units, Unit Conversions
Topic: Webcam
Replies: 11
Views: 107

Re: Webcam

Lavelle's email said you can also check out/rent webcams from UCLA, which might be cheaper than buying one.
by Jacquelyn Challis 1H
Sun Oct 11, 2020 8:49 pm
Forum: Student Social/Study Group
Topic: Groupme for 1D?
Replies: 3
Views: 43

Re: Groupme for 1D?

Hey, does anyone know if there's a groupme for 1H? Thank you! :)
by Jacquelyn Challis 1H
Sun Oct 11, 2020 8:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Registering/Creating Your Chemistry Community Account
Replies: 25
Views: 44380

Re: Registering/Creating Your Chemistry Community Account

Does anyone know how to create a new post? I only see the post reply button but i can't figure out how to start my own new discussion.
by Jacquelyn Challis 1H
Sun Oct 11, 2020 8:43 pm
Forum: Molarity, Solutions, Dilutions
Topic: Sapling HW Number 7
Replies: 12
Views: 118

Re: Sapling HW Number 7

I needed a refresher course on molarity as well, and I found that the video under Audio-Visual Focus-Topics titled "Molarity and Dilution of a Solution" on Lavelle's website to be super helpful.
by Jacquelyn Challis 1H
Sun Oct 11, 2020 8:37 pm
Forum: SI Units, Unit Conversions
Topic: Textbook
Replies: 22
Views: 164

Re: Textbook

I ordered my textbook to be picked up at the UCLA store and got a confirmation that it shipped, but that was almost a week ago. Does anyone know how long it takes for it to be delivered to the UCLA store once it ships?
by Jacquelyn Challis 1H
Sun Oct 11, 2020 8:21 pm
Forum: Empirical & Molecular Formulas
Topic: Sapling Hw #10
Replies: 10
Views: 95

Re: Sapling Hw #10

I think I understand the steps in this question, but how do you know if the equation is balanced? Are we supposed to assume it is balanced, and if not how would I go about balancing it?

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