Search found 44 matches

by Adrienne Yuh 2C
Thu Nov 26, 2020 4:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Chart
Replies: 2
Views: 13

Re: VSEPR Chart

I'm pretty sure we have to memorize it. I don't see a VSEPR chart on his website and we had to remember all of them in high school.
by Adrienne Yuh 2C
Tue Nov 24, 2020 11:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 6
Views: 43

Re: Final

He is probably going to finish with the material a while before the final. That way, we have more time to study and ask questions.
by Adrienne Yuh 2C
Tue Nov 24, 2020 11:41 pm
Forum: Administrative Questions and Class Announcements
Topic: grades
Replies: 10
Views: 115

Re: grades

I'm assuming it will follow normal UCLA grading, with 93-100 being an A. Aside from that, we need 50% of the poitns to pass the class.
by Adrienne Yuh 2C
Tue Nov 24, 2020 11:40 pm
Forum: Quantum Numbers and The H-Atom
Topic: Silver Electron Configuration
Replies: 7
Views: 18

Re: Silver Electron Configuration

The unstable nature of unfilled orbitals allow silver to "borrow" an electron from the s orbital to the d, to make it complete.
by Adrienne Yuh 2C
Fri Nov 20, 2020 9:22 pm
Forum: Trends in The Periodic Table
Topic: Metallic Character
Replies: 7
Views: 46

Re: Metallic Character

Metallic character is greatest at the lower left corner! This is where they usually lose their electrons easier.
by Adrienne Yuh 2C
Fri Nov 20, 2020 9:20 pm
Forum: Bond Lengths & Energies
Topic: Boiling vs. Melting Point
Replies: 12
Views: 52

Re: Boiling vs. Melting Point

They are both affected in the same way by intermolecular bond strengths, but are defined differently as shown above.
by Adrienne Yuh 2C
Fri Nov 20, 2020 9:19 pm
Forum: Trends in The Periodic Table
Topic: Identifying Elements
Replies: 8
Views: 45

Re: Identifying Elements

They have similar chemical properties and are usually grouped near each other.
by Adrienne Yuh 2C
Fri Nov 20, 2020 9:18 pm
Forum: Student Social/Study Group
Topic: Study Tips for Final Exam
Replies: 56
Views: 210

Re: Study Tips for Final Exam

I think doing the textbook problems again and going to TA/UA hours would be extremely helpful. There's probably going to be a lot on the final, so starting now would be very beneficial.
by Adrienne Yuh 2C
Fri Nov 20, 2020 9:17 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Lewis acids and bases
Replies: 15
Views: 33

Re: Lewis acids and bases

Lewis acids ACCEPT electrons, meaning they usually have a positive charge or full shells while bases donate since they have lone pair electrons and a negative charge.
by Adrienne Yuh 2C
Sun Nov 15, 2020 5:31 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Textbook 1E#17
Replies: 3
Views: 15

Re: Textbook 1E#17

Like said above, you had the electron configuration wrong. Otherwise, you would be taking electrons off of the valence ones first (s and p).
by Adrienne Yuh 2C
Thu Nov 12, 2020 7:57 pm
Forum: Dipole Moments
Topic: induced dipole vs dipole
Replies: 11
Views: 40

Re: induced dipole vs dipole

Dipole dipole interactions happen between fixed partial charges while a dipole-induced interaction happens during an interaction between a polar molecule and a non-polar molecule.
by Adrienne Yuh 2C
Thu Nov 12, 2020 7:55 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configurations
Replies: 7
Views: 29

Re: Electron configurations

Electrons always fill 4s before 3d because 3d has more energy, so they are harder to remove.
by Adrienne Yuh 2C
Wed Nov 11, 2020 1:14 am
Forum: Administrative Questions and Class Announcements
Topic: Workshops/Step-Ups on Veteran's Day
Replies: 4
Views: 31

Re: Workshops/Step-Ups on Veteran's Day

Yes :) Refer to Professor Lavelle's email to find out which ones are happening specifically.
by Adrienne Yuh 2C
Wed Nov 11, 2020 1:13 am
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 Questions
Replies: 16
Views: 77

Re: Midterm 2 Questions

Hi! I think Professor Lavelle mentioned that there are going to be more questions with less points each for this midterm.
by Adrienne Yuh 2C
Thu Nov 05, 2020 2:20 pm
Forum: Student Social/Study Group
Topic: Studying Tips
Replies: 23
Views: 86

Re: Studying Tips

I like reviewing textbook problems and reading through the lessons to find things I have trouble with. TA/UA sessions are pretty helpful too!
by Adrienne Yuh 2C
Thu Nov 05, 2020 2:10 pm
Forum: Student Social/Study Group
Topic: Test Anxiety
Replies: 62
Views: 229

Re: Test Anxiety

I think a helpful tip is to read through all the problems first, without spending too much time on hard ones. This allows you to think about it or get hints from later questions, without wasting your effort or time. Pausing for a bit and forcing yourself to relax is a good way to calm your nerves, t...
by Adrienne Yuh 2C
Thu Nov 05, 2020 2:09 pm
Forum: Octet Exceptions
Topic: Group 13 Elements
Replies: 12
Views: 87

Re: Group 13 Elements

Yes! I think all of the Group 13 Elements don't require an octet.
by Adrienne Yuh 2C
Thu Nov 05, 2020 2:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 1 Review
Replies: 7
Views: 56

Re: Midterm 1 Review

Me too! Professor Lavelle said we could look at similar problems in homework/textbook but I don't really remember what questions I had trouble with.
by Adrienne Yuh 2C
Thu Nov 05, 2020 2:07 pm
Forum: General Science Questions
Topic: Grade Breakdown
Replies: 15
Views: 124

Re: Grade Breakdown

I don't think he mentions anything on this, but he does say 50% or higher is required to pass with a C- or higher.
by Adrienne Yuh 2C
Thu Nov 05, 2020 2:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 1
Replies: 5
Views: 52

Re: Midterm 1

I think a lot of the major problems (ones worth 12 points) were probably broken down into partial credit!
by Adrienne Yuh 2C
Fri Oct 30, 2020 2:10 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: h vs. ħ?
Replies: 11
Views: 88

Re: h vs. ħ?

The h-bar symbol represents 2pi! I would ultimately just follow the formula sheet to keep it a familiar representation of the equation.
by Adrienne Yuh 2C
Fri Oct 30, 2020 2:08 pm
Forum: Student Social/Study Group
Topic: How to relax
Replies: 97
Views: 369

Re: How to relax

I like doing arts and crafts, whether it's drawing or watching videos on it! Playing games with your friends is a fun way to relax, too.
by Adrienne Yuh 2C
Fri Oct 30, 2020 2:07 pm
Forum: Balancing Chemical Reactions
Topic: Molar Mass
Replies: 23
Views: 137

Re: Molar Mass

I think the best way to do molar mass, and to be as accurate as possible, is to first take all the numbers without rounding and then do the calculations. At the end, you can round to get the most exact answer.
by Adrienne Yuh 2C
Fri Oct 30, 2020 2:05 pm
Forum: Quantum Numbers and The H-Atom
Topic: Rydberg equation
Replies: 7
Views: 29

Re: Rydberg equation

Like many people said, it depends on if it's an emission or absorption problem. I think you'll mostly see it used in emission though!
by Adrienne Yuh 2C
Fri Oct 30, 2020 2:04 pm
Forum: DeBroglie Equation
Topic: Conversions
Replies: 9
Views: 68

Re: Conversions

In most problems like these, there will usually be unit conversions given since miles aren't metric!
by Adrienne Yuh 2C
Fri Oct 30, 2020 2:02 pm
Forum: Student Social/Study Group
Topic: Test Scored for Midterm 1
Replies: 49
Views: 343

Re: Test Scored for Midterm 1

I think he said he would release it after he has everyone take it and can look over any errors! Probably after Friday :)
by Adrienne Yuh 2C
Tue Oct 27, 2020 2:15 am
Forum: Administrative Questions and Class Announcements
Topic: how far in the sapling hw does midterm 1 go to
Replies: 5
Views: 61

Re: how far in the sapling hw does midterm 1 go to

The sapling questions are randomized, which Professor Lavelle emailed Sapling about. I think the textbook questions are probably more helpful in determining the content for the midterm.
by Adrienne Yuh 2C
Tue Oct 27, 2020 2:14 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: delta x for textbook question 1b 27
Replies: 2
Views: 28

Re: delta x for textbook question 1b 27

This is an error in the textbook. The real answer uses 10, which you're right about! You can find the corrections on the solution errors page on his website.
by Adrienne Yuh 2C
Tue Oct 27, 2020 2:13 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation Confusion
Replies: 9
Views: 56

Re: Rydberg Equation Confusion

Yea! I asked the professor about this and he said he uses the one with frequency since it's easier for a lot of the problems we have. It's just a difference between whether the equation is wavelength or frequency, but it's better to stick with one and convert after solving.
by Adrienne Yuh 2C
Wed Oct 21, 2020 1:35 am
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 196
Views: 840

Re: How are you studying?

Working with others, teaching people (just to solidify concepts), and watching review videos are all really good ways to study! Make sure to sleep well so you can retain information better :)
by Adrienne Yuh 2C
Tue Oct 20, 2020 8:51 pm
Forum: Photoelectric Effect
Topic: Constants and Equations
Replies: 5
Views: 25

Re: Constants and Equations

I think there are constants and equations sheets on Professor Lavelle's website, if you want to see what the given sheets will possibly look like during the midterm! I think it's a great way to be familiar with where and how the individual constants and equations are displayed.
by Adrienne Yuh 2C
Tue Oct 20, 2020 8:49 pm
Forum: General Science Questions
Topic: Rydberg Formula
Replies: 6
Views: 58

Re: Rydberg Formula

There are different variations of R online and in the textbook, but the one the professor gave us is relative to frequency, R=3.29*10^15.
by Adrienne Yuh 2C
Tue Oct 20, 2020 8:47 pm
Forum: Photoelectric Effect
Topic: Spectral Lines
Replies: 4
Views: 31

Re: Spectral Lines

Hi! Spectral lines show the emissions/absorptions of energy by electrons.
by Adrienne Yuh 2C
Tue Oct 20, 2020 8:46 pm
Forum: Properties of Electrons
Topic: Sapling 2 HW #6
Replies: 10
Views: 125

Re: Sapling 2 HW #6

Thank you so much for the responses! For the wavelength questions, I think we are supposed to use the Rydberg equation.
by Adrienne Yuh 2C
Sun Oct 18, 2020 10:16 pm
Forum: Properties of Electrons
Topic: Sapling 2 HW #6
Replies: 10
Views: 125

Sapling 2 HW #6

Hi! I was having a bit of trouble with this question: The electron in a hydrogen atom is excited to the n=5 shell and emits electromagnetic radiation when returning to lower energy levels. Determine the number of spectral lines that could appear when this electron returns to the lower energy levels,...
by Adrienne Yuh 2C
Sat Oct 17, 2020 3:33 pm
Forum: Limiting Reactant Calculations
Topic: Testing with a periodic table
Replies: 14
Views: 111

Re: Testing with a periodic table

I think he will provide us with a list of equations, constants, and the periodic table so that it is standardized for all students during the test!
by Adrienne Yuh 2C
Sat Oct 17, 2020 4:13 am
Forum: Limiting Reactant Calculations
Topic: Actual yield
Replies: 20
Views: 144

Re: Actual yield

Usually in the case of problems, it should be given to us as a percent or a straight value for us to calculate the theoretical yield.
by Adrienne Yuh 2C
Sat Oct 17, 2020 4:10 am
Forum: Ionic & Covalent Bonds
Topic: Is ionic or covalent stronger?
Replies: 31
Views: 331

Re: Is ionic or covalent stronger?

In terms of chemistry, ionic bonds are stronger than covalent bonds!
by Adrienne Yuh 2C
Sat Oct 17, 2020 4:09 am
Forum: Ionic & Covalent Bonds
Topic: Hydrogen bonds
Replies: 4
Views: 134

Re: Hydrogen bonds

A bond is only classified as a Hydrogen bond if an H is bonded to one of the atoms in NOF.
by Adrienne Yuh 2C
Wed Oct 07, 2020 4:24 pm
Forum: SI Units, Unit Conversions
Topic: Prefixes
Replies: 6
Views: 136

Re: Prefixes

Like most people said, I think the basic conversion factors for kilo/milli is most important to know, but memorizing the others wouldn't hurt!
by Adrienne Yuh 2C
Wed Oct 07, 2020 2:45 pm
Forum: Balancing Chemical Reactions
Topic: Combustion Products
Replies: 13
Views: 66

Re: Combustion Products

The only thing in combustion reactions we know are the products! (CO2 and H2O) From there, you have to balance the equation like all the other ones :)
by Adrienne Yuh 2C
Mon Oct 05, 2020 2:41 pm
Forum: Significant Figures
Topic: Sig Figs for elements on Periodic table
Replies: 14
Views: 117

Re: Sig Figs for elements on Periodic table

I would go with 4 sig figs! I think in most chemistry problems, if your answer is accurate within the range of +/- %5 it's fine? That's what my teacher in high school went by!
by Adrienne Yuh 2C
Mon Oct 05, 2020 2:38 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 221
Views: 116126

Re: Advice from a Medical Student [ENDORSED]

This is extremely helpful to me as a premed student! Thank you so much.

Go to advanced search