Search found 36 matches

by Kat Stahl 1L
Sun Nov 22, 2020 4:43 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Character
Replies: 28
Views: 78

Re: Covalent Character

I thought it was just the smaller the difference in electronegativity the more covalent character that bond has.
by Kat Stahl 1L
Sun Nov 22, 2020 4:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Problem of viewing the lecture
Replies: 9
Views: 37

Re: Problem of viewing the lecture

I don't have this problem that is weird. Maybe try watching the second lecture or try restarting the browser?
by Kat Stahl 1L
Sun Nov 22, 2020 4:41 pm
Forum: Administrative Questions and Class Announcements
Topic: final
Replies: 5
Views: 22

Re: final

I think my TA said it was going to be cumulative, that makes sense though because it is worth most of our grade.
by Kat Stahl 1L
Sun Nov 22, 2020 4:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 Scores
Replies: 28
Views: 132

Re: Midterm 2 Scores

I mean last time we got our scores the Monday after so it could be that soon but might be later because of Thanksgiving and other holidays coming up.
by Kat Stahl 1L
Sun Nov 22, 2020 4:38 pm
Forum: Resonance Structures
Topic: Resonance Structures and Energy
Replies: 18
Views: 43

Re: Resonance Structures and Energy

Yes it always prefers the lowest energy structure because it is the most stable then. Here are more rules for which ones are more stable that might be helpful: 1. The greater the number of covalent bonds, the greater the stability since more atoms will have complete octets 2. The structure with the ...
by Kat Stahl 1L
Sun Nov 15, 2020 12:26 pm
Forum: Quantum Numbers and The H-Atom
Topic: Angular Quantum Numbers Greater than 3
Replies: 2
Views: 15

Re: Angular Quantum Numbers Greater than 3

Basically what she said^ It is possible but chemists don't use those and we won't need to know them. Here is a link that explains this: https://chem.libretexts.org/Courses/Oregon_Institute_of_Technology/OIT%3A_CHE_202_-_General_Chemistry_II/Unit_2%3A_Electrons_in_Atoms/2.2%3A_Atomic_Orbitals_and_Qua...
by Kat Stahl 1L
Sun Nov 15, 2020 12:22 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing Electron Configurations
Replies: 9
Views: 41

Re: Writing Electron Configurations

Here is a link that explains this pretty well: http://www.chemguide.co.uk/atoms/proper ... oblem.html
hope this helps.
by Kat Stahl 1L
Sun Nov 15, 2020 12:14 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem 14B and 14BL
Replies: 3
Views: 23

Re: Chem 14B and 14BL

Hi if you go to : https://courses.lumenlearning.com/suny- ... and-bases/ you can find different recommended paths based on your major. The recommend that you take them seperately.
by Kat Stahl 1L
Sun Nov 15, 2020 12:07 pm
Forum: Lewis Acids & Bases
Topic: Explanation of Lewis acids & Bases
Replies: 7
Views: 32

Re: Explanation of Lewis acids & Bases

Hi! If you draw the lewis structure for BF3, you should end up with a vacant orbital which means that B can still accept an electron making it the lewis acid, and the F- that comes in has electrons to give or donate so it is the lewis base. Here is a link to an explanation of this: https://courses.l...
by Kat Stahl 1L
Sun Nov 15, 2020 12:02 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: +1 Scandium?
Replies: 3
Views: 19

Re: +1 Scandium?

HI I found a website that was really helpful for understanding this! This is what they said. "Making Sc+ -You might expect the next electron to go into a lower energy 3d orbital as well, to give [Ar] 3d2. But it doesn't. You have something else to think about here as well. -If you add another e...
by Kat Stahl 1L
Sun Nov 15, 2020 11:51 am
Forum: Formal Charge and Oxidation Numbers
Topic: Clarification
Replies: 8
Views: 28

Re: Clarification

Yep! If you add all of the formal charges you will get the overall formal charge of the compound.
by Kat Stahl 1L
Sun Nov 15, 2020 11:50 am
Forum: Resonance Structures
Topic: Resonance
Replies: 19
Views: 65

Re: Resonance

The reason why resonance lowers energy is due to the double bond that there is. Because of a bond having resonance, all the bond lengths become shorter due to partial bond lengths. Basically, now all the bonds are shorter because of the resonance. My TA explained it really well in my last discussio...
by Kat Stahl 1L
Sun Nov 15, 2020 11:45 am
Forum: Lewis Structures
Topic: Lewis acid and Lewis bases
Replies: 8
Views: 43

Re: Lewis acid and Lewis bases

HI I found a really good pdf that just gives some general rules for knowing what is a lewis acid and what is a lewis base! http://ww2.chemistry.gatech.edu/~barefi ... _lewis.pdf
by Kat Stahl 1L
Sun Nov 15, 2020 11:40 am
Forum: Ionic & Covalent Bonds
Topic: Electronegativity
Replies: 18
Views: 45

Re: Electronegativity

Like a lot of people have said above, we won't need to know how to calculate electronegativity we just need to know the general trends on the periodic table.
by Kat Stahl 1L
Sun Nov 15, 2020 11:38 am
Forum: Administrative Questions and Class Announcements
Topic: #Questions on Midterm 2
Replies: 6
Views: 28

Re: #Questions on Midterm 2

Hi! My ta also said their will be more questions on this midterm than the last one. He also said they will be worth less so that it gives us a bit more room so one getting one question wrong doesn't ruin our whole exam.
by Kat Stahl 1L
Sun Nov 01, 2020 3:56 pm
Forum: Quantum Numbers and The H-Atom
Topic: wavelength
Replies: 13
Views: 43

Re: wavelength

Wavelength and frequency are always positive. In Rydberg's equation it can sometimes be negative but that is only when energy is being released.
by Kat Stahl 1L
Sun Nov 01, 2020 3:55 pm
Forum: Properties of Light
Topic: Is c always the speed of light?
Replies: 70
Views: 236

Re: Is c always the speed of light?

In this class I think that c will only be used to represent speed of light yes.
by Kat Stahl 1L
Sun Nov 01, 2020 3:43 pm
Forum: SI Units, Unit Conversions
Topic: eV to Joules (Defining these Units) Question
Replies: 12
Views: 61

Re: eV to Joules (Defining these Units) Question

An eV is an electron volt. The conversion from eV to joules is: 1 eV = 1.602 × 10-19 J . In particle physics people use something more convenient than the Joule called electron volt (eV) . The reason they use this is that the energies they are measuring in particle collisions are very small and are ...
by Kat Stahl 1L
Sun Nov 01, 2020 3:40 pm
Forum: Student Social/Study Group
Topic: Halloween!!!
Replies: 54
Views: 220

Re: Halloween!!!

Happy November 1st! My friend and I dressed up as Wendy and went and got Wendy's and watched a scary movie.
by Kat Stahl 1L
Sun Nov 01, 2020 3:35 pm
Forum: Photoelectric Effect
Topic: Sapling Problem #25
Replies: 4
Views: 29

Re: Sapling Problem #25

To get the velocity you have to use the equation wavelength=h/(m*v). Then you can use the equation KE=1/2m*v^2 to get the energy of the electron.
by Kat Stahl 1L
Sat Oct 24, 2020 7:32 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 92
Views: 1931

Re: Advice for studying

What I'm planning to do to study is do all of the problems that are recommended in the book, do the sapling homework, do the audio visual topics, and possibly even rewatch the lectures that I am confused on. I will then probably look up YouTube videos on the topics that I am confused about. I'm supe...
by Kat Stahl 1L
Sat Oct 24, 2020 7:26 pm
Forum: Student Social/Study Group
Topic: Textbook Problems
Replies: 4
Views: 39

Re: Textbook Problems

Hi! On sapling you will find a file titled Atkins 7e SSM and that will have all of the solutions to the odd textbook problems.
by Kat Stahl 1L
Sat Oct 24, 2020 7:20 pm
Forum: Administrative Questions and Class Announcements
Topic: Questions on midterm
Replies: 7
Views: 39

Re: Questions on midterm

My TA said that there would be 10 multiple choice questions that are varying difficulty. He said to expect at least one difficult problem that has multiple calculations. But people above said different things so now I'm not quite sure but that is what my TA said.
by Kat Stahl 1L
Sat Oct 24, 2020 7:16 pm
Forum: *Shrodinger Equation
Topic: 1D on midterm
Replies: 1
Views: 42

Re: 1D on midterm

He sent out an email that has a link to an outline of the Quantum World and on his website he wrote : "Midterm 1 covers material up to Wednesday of Week 3. In Outline 2 below, all topics except the last 8 listed. MT 1 is to the end of 1D.2 in textbook. Quantum numbers, shape of orbitals, etc., ...
by Kat Stahl 1L
Sat Oct 24, 2020 7:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Format
Replies: 12
Views: 89

Re: Midterm Format

My TA said that we will be able to go back to previous questions at any time!
by Kat Stahl 1L
Wed Oct 14, 2020 11:26 am
Forum: Properties of Electrons
Topic: Analogy for Exciting Electrons?
Replies: 3
Views: 35

Re: Analogy for Exciting Electrons?

A bridge is a really good way to look at! Thank you for coming up with that! I found a YouTube video that supports that and kind of just goes into more depth about the process if anyone is having trouble understanding it like I was. "In order for a transition to occur, the energy of the photon ...
by Kat Stahl 1L
Wed Oct 14, 2020 11:14 am
Forum: Properties of Light
Topic: work function
Replies: 15
Views: 138

Re: work function

I would definitely use my calculator when I do problems like that. Make sure to use parentheses and I think you should be set!
by Kat Stahl 1L
Wed Oct 14, 2020 10:36 am
Forum: *Black Body Radiation
Topic: Black Body Radiation
Replies: 6
Views: 70

Re: Black Body Radiation

That would make sense but he hasn't gone into detail about Black Body Radiation yet so I literally have no idea. When I looked it up it said "A blackbody is a theoretical or model body which absorbs all radiation falling on it, reflecting or transmitting none. It is a hypothetical object which ...
by Kat Stahl 1L
Wed Oct 14, 2020 10:27 am
Forum: Empirical & Molecular Formulas
Topic: Dealing with Diatomic Elements
Replies: 10
Views: 66

Re: Dealing with Diatomic Elements

We had a similar problem in my discussion about nicotine, and my TA told us to find the moles of N. That way you can find the empirical formula more easily I think.
by Kat Stahl 1L
Wed Oct 14, 2020 10:12 am
Forum: Properties of Light
Topic: Photons
Replies: 9
Views: 76

Re: Photons

To put it simply photons are the fundamental particle of light. They are the "stuff" light is made of. A photon is a single quantum of light (or of any other form of electromagnetic radiation).They are both a particle and a wave.
by Kat Stahl 1L
Wed Oct 07, 2020 12:00 pm
Forum: Molarity, Solutions, Dilutions
Topic: Sapling HW Question 5
Replies: 10
Views: 107

Re: Sapling HW Question 5

Hello I am also having the same difficulties on question 5 as well except mine says "Calculate the percent composition by mass of each element in NaClO2." I have tried it twice but still cant get it, can someone walk me through it? Hi! I had a different problem than you for problem 5 but ...
by Kat Stahl 1L
Wed Oct 07, 2020 11:12 am
Forum: Molarity, Solutions, Dilutions
Topic: Sapling HW Question 5
Replies: 10
Views: 107

Re: Sapling HW Question 5

Hi! I have a follow up question regarding mass percentage. Do we always format our answers with the decimal place to the hundredth? I believe so, I mean that is what I did all through high school and based on all of the example problems he has given us that is what he wants us to do too. Hope this ...
by Kat Stahl 1L
Wed Oct 07, 2020 10:31 am
Forum: Empirical & Molecular Formulas
Topic: Sapling HW 9
Replies: 21
Views: 217

Re: Sapling HW 9

Hey Guys, in regards to sapling HW. I was finally able to grab a hold on the access code. Are the HW problems in the syllabus, are the problems submitted on sapling? There is another discussion about the sapling HW and where it is turned in. https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=157&a...
by Kat Stahl 1L
Wed Oct 07, 2020 10:20 am
Forum: SI Units, Unit Conversions
Topic: Rounding in Between Steps [ENDORSED]
Replies: 22
Views: 168

Re: Rounding in Between Steps [ENDORSED]

Follow-up question, I completely agree that in order to maintain accuracy we should wait until the final step to round. Let's say you were doing a multi-step problem with lots of calculations, would you agree that after each set of calculations it would be best to round to the correct number of sig...
by Kat Stahl 1L
Mon Oct 05, 2020 10:28 am
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 221
Views: 116126

Re: Advice from a Medical Student [ENDORSED]

Thank you so much for all of the good advice! I am still deciding if I want to do premed or not just because it is such a big thing to commit to right now. I was wondering what med school you go to in NY. My brother is at Albert Einstein School of Medicine there!
by Kat Stahl 1L
Mon Oct 05, 2020 10:23 am
Forum: Administrative Questions and Class Announcements
Topic: Structure of Lectures
Replies: 9
Views: 173

Re: Structure of Lectures

Hey Colm,
If you click on the video labeled week 1 it should be different from the video we had on Friday.
Kat

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