Search found 45 matches

by magalysantos_1F
Thu Nov 26, 2020 10:22 pm
Forum: Student Social/Study Group
Topic: How have your study habits changed?
Replies: 39
Views: 113

Re: How have your study habits changed?

Yes they have changed, I start studying for an exam about 2 weeks before to avoid cramming. I am still not getting the grades I want though. I relate to this a lot actually, I developed better study habits but never seemed to get the grades I want on the exams. I guess it's a matter of constantly c...
by magalysantos_1F
Thu Nov 26, 2020 1:48 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Lecture Example Chelating Ligand
Replies: 2
Views: 25

Lecture Example Chelating Ligand

For the chelating ligand example in lecture #24 with the cation Co2+, why is it considered a bidentate (unless I misheard Prof Lavelle)? And what is meant by rotation? Does it mean that NH2 can become H2N to bond with Co2+? I cannot seem to grasp the chelating concept well, sorry if this question se...
by magalysantos_1F
Wed Nov 25, 2020 12:49 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling wk 8 #17
Replies: 2
Views: 15

Re: Sapling wk 8 #17

Your last structure should look like something like this: H H \ / C / \ C = C / \ H H Sorry if it seems out of proportion, but I am assuming this is what they mean by cyclic because of the ring of Carbons.
by magalysantos_1F
Tue Nov 24, 2020 10:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: sapling HW question three
Replies: 5
Views: 27

Re: sapling HW question three

I think what it's really asking is the smallest bond angle possible, and because this is a linear shape, it would be 180 degrees. These measurements were talked about in the lectures, so you don't have to necessarily do any calculations :)
by magalysantos_1F
Mon Nov 23, 2020 6:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR T-Shaped Molecular Geometry
Replies: 7
Views: 39

Re: VSEPR T-Shaped Molecular Geometry

Samantha Pedersen 2D wrote:Hello, will we be expected to recognize T-shaped molecular geometry as one of the VSEPR shapes? Thank you!

If it helps, you can recognize whether a VSEPR shape is T-shaped by seeing if it has 3 outer atoms connected to the central atom and 2 lone pairs on the central atom!
by magalysantos_1F
Wed Nov 18, 2020 7:10 pm
Forum: Student Social/Study Group
Topic: Big Sad: Midterm 2
Replies: 74
Views: 463

Big Sad: Midterm 2

After taking the second midterm, I just realized how many mistakes I made and how probable it is that I am not going to pass it haha. While there are students worried about getting an A-, I am worried about getting a passing grade haha. For those of us who have taken it, how are you feeling?
by magalysantos_1F
Wed Nov 18, 2020 12:01 am
Forum: Dipole Moments
Topic: Dipole representation on midterm 2
Replies: 9
Views: 79

Re: Dipole representation on midterm 2

Oh, correct me if I'm wrong, but I always thought the direction of the arrow would be in the positive direction because the partial positive is attracting the negatively charged electrons. In other words, the electrons would be the ones to move closer to the positive source I think this is true for...
by magalysantos_1F
Tue Nov 17, 2020 11:29 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 4
Views: 20

Re: Resonance

Resonance does not necessarily mean the lowest energy structure. Resonance is all possible Lewis structures of a molecule, in which you can find the most stable structure (because it will have the lowest energy).
by magalysantos_1F
Mon Nov 16, 2020 3:26 pm
Forum: Ionic & Covalent Bonds
Topic: Textbook 2A.5
Replies: 4
Views: 45

Re: Textbook 2A.5

Usually for cations and anions, I like to find the configuration of the atom before it loses or gains electrons as a basis. For Bi, the ground state configuration would be [Xe]4f^14 5d^10 6s^2 6p^3 (we did not learn about how to write electron configurations with f orbitals, but the f orbitals shou...
by magalysantos_1F
Mon Nov 16, 2020 3:15 pm
Forum: Ionic & Covalent Bonds
Topic: Textbook Problem 2A.5
Replies: 3
Views: 23

Re: Textbook Problem 2A.5

Faith Veenker 3H wrote:I think you are looking at 2A.6, which is not an assigned problem. For 2A.5, [Ar]3d^10 is the configuration for Cu+.

I just noticed that haha, my mistake! Thank for answering though!
by magalysantos_1F
Mon Nov 16, 2020 3:09 pm
Forum: Ionic & Covalent Bonds
Topic: Textbook Problem 2A.5
Replies: 3
Views: 23

Textbook Problem 2A.5

For (a), the electron configuration for Zr^4+ is [Ar]3d^10. Why can it not be [Kr], just as how we used [Ar] for S^2-? Is there a clear reason for this?
by magalysantos_1F
Wed Nov 11, 2020 2:49 am
Forum: General Science Questions
Topic: Which would have lower ionization energy?
Replies: 13
Views: 59

Which would have lower ionization energy?

Out of curiosity, which would have lower ionization energy, Cl or O? If it were to ever be needed in making a Lewis structure.
by magalysantos_1F
Wed Nov 11, 2020 1:36 am
Forum: Ionic & Covalent Bonds
Topic: Increasing Covalent Character
Replies: 3
Views: 40

Re: Increasing Covalent Character

Much of it has to do with electron density. As the anion in an ionic silver halide becomes bigger, meaning it has more electrons that are very loosely held, the cation Ag will distort the electrons even more than if it were a smaller anion. This causes the electrons to be shared more covalently betw...
by magalysantos_1F
Wed Nov 11, 2020 12:10 am
Forum: Student Social/Study Group
Topic: Lecture on Veteran's Day
Replies: 10
Views: 55

Re: Lecture on Veteran's Day

Will there be a lecture posted this Wednesday? Just checking to see as it's Veteran's Day. In addition to that, what happens if we have a lab on that day? I assume that we might have to join another lab session instead but I am not sure. You do not show up to lab if it it's on that day, and you don...
by magalysantos_1F
Tue Nov 10, 2020 1:26 am
Forum: Student Social/Study Group
Topic: grade worries
Replies: 99
Views: 603

Re: grade worries

After deciding to apply to grad school in the near future, yes, grades are a huge worry for me. I think for the next two exams, aim for no more than 30 points incorrect each. It really depends on what you got on your first midterm and what you want as a final grade, but any more than 30 points incor...
by magalysantos_1F
Tue Nov 10, 2020 1:22 am
Forum: Student Social/Study Group
Topic: Mid-quarter Check in
Replies: 67
Views: 207

Re: Mid-quarter Check in

Thanks for asking this question, I am honestly bummed out because there is so many assignments that I can't even leave my room, and it's become so repetitive. College is supposed to be a balance of social and academic, but it's purely academic for me. Last year this time around was not super great f...
by magalysantos_1F
Wed Nov 04, 2020 5:15 pm
Forum: Student Social/Study Group
Topic: Post Midterm Blues
Replies: 71
Views: 449

Re: Post Midterm Blues

Same here, I was just in my discussion and my TA mentioned that our average was high compared to other sections, and all the other students were happy about it. But I know I did not really contribute to that average, and it upsets me. Let's hope the next midterm is better! :')
by magalysantos_1F
Wed Nov 04, 2020 5:11 pm
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 142
Views: 483

Re: Favorite TV shows

S*x Education is so so so good! If you don't mind something a little explicit, hence the name, it's hilarious and interesting! The Good Place never gets old either, they just added a new season on Netflix!
by magalysantos_1F
Wed Nov 04, 2020 4:50 pm
Forum: Lewis Structures
Topic: Valence Electrons
Replies: 10
Views: 66

Re: Valence Electrons

Here's an extra tip! For Lewis structures, remember that the first shell can hold 2 electrons, the second and third shell can hold 8, and the fourth and fifth shell can hold 18. Once you count the electrons (atomic number), you can draw it out and the amount left over on the last shell are the valen...
by magalysantos_1F
Wed Nov 04, 2020 4:43 pm
Forum: Ionic & Covalent Bonds
Topic: 2 paired electrons
Replies: 3
Views: 12

Re: 2 paired electrons

I agree with what Liam said, and when you see a singular electron ( . ) forming a bond with another singular electron from another atom, it preferably becomes a dash rather then the regular electron pair ( : )
by magalysantos_1F
Mon Nov 02, 2020 8:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Scores
Replies: 28
Views: 254

Re: Midterm Scores

Update: someone went to Prof Lavelle's OH and he mentioned that the scores would be up Thursday!
by magalysantos_1F
Thu Oct 29, 2020 12:43 am
Forum: Einstein Equation
Topic: E=pc vs E=hv
Replies: 15
Views: 83

Re: E=pc vs E=hv

I believe E=pc is usually used in cases like DeBroglie problems, where p=mass x velocity. E=hv is a more common formula we have been using because we are often given problems involving frequency.
by magalysantos_1F
Thu Oct 29, 2020 12:39 am
Forum: Empirical & Molecular Formulas
Topic: Review for Midterm
Replies: 11
Views: 110

Re: Review for Midterm

I have heard that the formulas will be provided so I do not think you need to know them based on names. However, it is good practice to know because many of the practice problems in the outlines tend to use names a lot.
by magalysantos_1F
Thu Oct 29, 2020 12:34 am
Forum: General Science Questions
Topic: Understanding Velocity
Replies: 3
Views: 43

Understanding Velocity

Sorry for the silly question! I have seen some practice problems regarding finding the velocity of an electron when given wavelength, work function etc. Is there particular formulas we can use for velocity of an electron?
by magalysantos_1F
Thu Oct 29, 2020 12:20 am
Forum: Student Social/Study Group
Topic: Lavelle's Jokes
Replies: 18
Views: 178

Re: Lavelle's Jokes

An electron walks into a bar. He asks the bartender, "How much for a beer?" The bartender frowns and tells him, "No can do, you got a negative on your tab."

I really liked the neutron bartender joke and modified it to be an electron joke :)
by magalysantos_1F
Mon Oct 26, 2020 5:32 pm
Forum: Einstein Equation
Topic: Sapling Homework - electron affinity
Replies: 5
Views: 75

Re: Sapling Homework - electron affinity

Yeah I couldn't get the right answer for the second part either. I wonder if there is anything wrong with my conversions. @Samantha, could you explain your steps for the first part and how you got 1.003? I used E=hc/lambda and converted nm to m as well as J to eV, but I still didn't get to 1.003. T...
by magalysantos_1F
Sun Oct 25, 2020 5:24 pm
Forum: DeBroglie Equation
Topic: Help on DeBroglie Post-Module #34?
Replies: 2
Views: 30

Re: Help on DeBroglie Post-Module #34?

Hi! I solved the problem the exact same way and got the same answer. But when you choose an answer, you have to remember to use the correct number of sig figs. So while 99908.32439 is the exact answer, 1.00 x 10^5 is the correct answer when you use the right number of sig figs. Another way to look ...
by magalysantos_1F
Sun Oct 25, 2020 2:57 pm
Forum: DeBroglie Equation
Topic: Help on DeBroglie Post-Module #34?
Replies: 2
Views: 30

Help on DeBroglie Post-Module #34?

"If an electron (mass 9.11 x 10^-31 kg) has an associated wavelength of 7.28 x 10^-9 m, what is its speed? Is your answer reasonable, why?" I keep using the formula v=h/(wavelength)(mass), but I get a long decimal number (99908.32439) and not the one stated in the multiple choice options (...
by magalysantos_1F
Tue Oct 20, 2020 9:24 pm
Forum: Administrative Questions and Class Announcements
Topic: Video Learning Modules?
Replies: 5
Views: 32

Re: Video Learning Modules?

I think the post-module assessment in the modules are especially useful, it lets us practice a lot of what is taught in the videos. I hope we get to see more soon, especially if future topics are more difficult to understand.
by magalysantos_1F
Tue Oct 20, 2020 9:11 pm
Forum: Student Social/Study Group
Topic: How to memorize formulas?
Replies: 4
Views: 26

How to memorize formulas?

Hello! I was wondering if anyone had any tips for knowing which formulas to use for certain problems to prep for the midterm? For example, if it asks for maximum kinetic energy, or the frequency of an incident light? Or would just memorizing example problems and the formulas used to solve them be en...
by magalysantos_1F
Tue Oct 20, 2020 9:01 pm
Forum: Student Social/Study Group
Topic: Midterm Fundamentals Review Sheet
Replies: 7
Views: 67

Re: Midterm Fundamentals Review Sheet

You are amazing!! Thanks so much! This is actually so good for memorizing :)
by magalysantos_1F
Tue Oct 20, 2020 8:56 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module Question
Replies: 3
Views: 20

Re: Photoelectric Effect Module Question

For this problem, you need to use the formula E(kinetic energy)=1/2(MV^2). Thus, when you plug in the values the problem provides you, it is 1/2(9.10938 x 10^-31)(6.61 x 10^5)^2. All you have to do is solve :)
by magalysantos_1F
Mon Oct 19, 2020 5:21 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 196
Views: 873

Re: How are you studying?

Brian_Wu_3G wrote:I see everyone mentioning step up sessions. What are those again? I might want to attend them if they help.

Step up sessions basically go through prepared worksheets and practice problems based on the topic the week focuses on. They do help if you do not understand a certain topic.
by magalysantos_1F
Thu Oct 15, 2020 4:57 pm
Forum: Student Social/Study Group
Topic: Clarification on buying an external webcam
Replies: 5
Views: 76

Re: Clarification on buying an external webcam

How would the webcam proctoring work if we are going to be using a lockdown application during tests? A zoom link appears at the top of your exam on Respondus, and once you click on that link, it opens zoom (make sure that you join it through the browser and not the app). They should be going over ...
by magalysantos_1F
Wed Oct 14, 2020 1:30 pm
Forum: Student Social/Study Group
Topic: Respondus link
Replies: 4
Views: 35

Re: Respondus link

What is Respondus for? I would post this as a new topic, but I don't see where to do that lol. Respondus is a program that locks down all browsers so you do not have any tabs open during an exam and whatnot. It also asks to show your entire desk and set-up in order to make sure you do not have any ...
by magalysantos_1F
Wed Oct 14, 2020 1:16 pm
Forum: Student Social/Study Group
Topic: Clarification on buying an external webcam
Replies: 5
Views: 76

Re: Clarification on buying an external webcam

Hi, Professor Lavelle answered questions regarding the external webcam and Respondus in the endorsed post "Built-in webcams/Equipment request" under announcements, but he highly recommends buying one just in case!
by magalysantos_1F
Wed Oct 14, 2020 1:06 pm
Forum: SI Units, Unit Conversions
Topic: SI Units
Replies: 13
Views: 101

Re: SI Units

How would we convert mL to an SI unit?
by magalysantos_1F
Wed Oct 14, 2020 12:46 pm
Forum: SI Units, Unit Conversions
Topic: Help Understanding SI Units?
Replies: 7
Views: 104

Help Understanding SI Units?

In one of the recent lectures, Professor Lavelle said that we use "multiple powers of 10 w/ respect to SI Base Units" and "convert all prefixes by powers of 10 they represent." However, I am still a bit confused on when it is appropriate to convert a calculation by a power of 10 ...
by magalysantos_1F
Wed Oct 14, 2020 12:35 pm
Forum: Photoelectric Effect
Topic: Wave model validity
Replies: 2
Views: 23

Re: Wave model validity

Both models are correct, it's just that the photoelectric experiment proved that light is not only modeled waves, but is modeled with particles as well!
by magalysantos_1F
Wed Oct 07, 2020 9:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Learning Outcome Outlines
Replies: 5
Views: 31

Re: Learning Outcome Outlines

Lakshmi Davuluri 3K wrote:Are the three videos before the one about the photoelectric effect supposed to be review for the quantum unit?

If you mean the audio-visual videos, they are review for the basics so they are recommended to be done before the end of this week. The rest I am pretty sure are for the quantum unit.
by magalysantos_1F
Wed Oct 07, 2020 9:32 pm
Forum: Administrative Questions and Class Announcements
Topic: Step Up Sessions
Replies: 71
Views: 4395

Re: Step Up Sessions

Does anyone recommend step up sessions or UA sessions for someone who's only taken regular chemistry in high school and wants to catch up? I feel behind because I never took AP or Honors. Yes! I went to one today and feel a lot better already. I never took AP chem either and feel really overwhelmed...
by magalysantos_1F
Wed Oct 07, 2020 9:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Learning Outcome Outlines
Replies: 5
Views: 31

Re: Learning Outcome Outlines

If you're talking about the fundamentals/outlines listed at the end of the syllabus, they should be reviewed throughout the quarter :) such as the the basics should be studied by the end of this week, the quantum world should be done before the end of week 3, etc.
by magalysantos_1F
Wed Oct 07, 2020 9:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Structure of Exams
Replies: 5
Views: 58

Re: Structure of Exams

My TA during discussion said the exams (or the next midterm) is most likely multiple choice, and will be taken during your discussion section so the TAs can proctor through webcams. :)
by magalysantos_1F
Tue Oct 06, 2020 9:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Step Up Sessions
Replies: 71
Views: 4395

Re: Step Up Sessions

Does anyone recommend step up sessions or UA sessions for someone who's only taken regular chemistry in high school and wants to catch up? I feel behind because I never took AP or Honors.
by magalysantos_1F
Tue Oct 06, 2020 9:11 pm
Forum: Student Social/Study Group
Topic: Zoom Lectures
Replies: 11
Views: 94

Re: Zoom Lectures

The pre-recorded lectures are also uploaded near your lecture time as well!

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