Search found 45 matches

by Chesca Legaspi 2F
Tue Dec 01, 2020 2:21 am
Forum: Administrative Questions and Class Announcements
Topic: 14B
Replies: 10
Views: 52

Re: 14B

As others have said before, it looks like we'll be having exams in lecture, but this quarter, the TAs and Dr. Lavelle have been fairly accommodating in regards to making sure everyone has a fair experience taking the test so if you absolutely can't get out of a lecture conflict, I'm sure they can he...
by Chesca Legaspi 2F
Tue Dec 01, 2020 2:18 am
Forum: Student Social/Study Group
Topic: Time differences with final exams
Replies: 3
Views: 23

Re: Time differences with final exams

Also, if for whatever reason you can't make the time slot for international students, I think if you e-mail your TA they might be able to work something out with you in regards to a possible makeup time. So far, Dr. Lavelle and the TAs have been fairly accommodating in regards to ensuring everyone h...
by Chesca Legaspi 2F
Tue Dec 01, 2020 2:17 am
Forum: Administrative Questions and Class Announcements
Topic: Final exam (fall 2020 quarter)
Replies: 12
Views: 82

Re: Final exam (fall 2020 quarter)

Because the final is set to be during a longer time span (2 hours I believe?), I'm pretty sure we'll all be taking it at the same time instead of in discussion section, but nothing's been set in stone so I could be wrong about that. Like everyone else has said, it should be cumulative, but I'm prett...
by Chesca Legaspi 2F
Tue Dec 01, 2020 2:15 am
Forum: Student Social/Study Group
Topic: Week 8/9 Thoughts/Worries
Replies: 44
Views: 131

Re: Week 8/9 Thoughts/Worries

The class has honestly been pretty manageable so far in terms of keeping up with the workload and finding resources to make sure I fully understand the material. That being said, I do think the testing system could be improved somewhat. For the final, if we all take it during the same time slot, I h...
by Chesca Legaspi 2F
Tue Dec 01, 2020 2:12 am
Forum: General Science Questions
Topic: study methods/recs
Replies: 12
Views: 30

Re: study methods/recs

If you have other friends who are taking the class or a class similar to this, I would recommend trying to explain the topics on the outlines to them. If you can explain a topic well enough that someone can understand what you're talking about, then you'll know that your understanding is where it ne...
by Chesca Legaspi 2F
Fri Nov 27, 2020 6:40 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: TM "Octet"
Replies: 4
Views: 16

Re: TM "Octet"

As others have said, because transition metals have d-orbitals, they're definitely capable of producing expanded octets and breaking the octet rule, but also keep in mind that just because they're capable of producing an expanded octet, that doesn't mean they'll always form one. So there definitely ...
by Chesca Legaspi 2F
Fri Nov 27, 2020 6:38 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: d orbitals
Replies: 3
Views: 13

Re: d orbitals

Another good thing to know about d-orbitals is that they allow elements to produce expanded octets. Because of this, elements in the third row or below in the periodic table can have an expanded octet. This is because, for n = 3, d-orbitals can accommodate more electrons by participating in bonding ...
by Chesca Legaspi 2F
Fri Nov 27, 2020 6:35 pm
Forum: Octet Exceptions
Topic: Question on Radicals
Replies: 7
Views: 25

Question on Radicals

Are radicals and free radicals the same thing? I've seen both terms used in reference to compounds with unpaired electrons, but I wasn't sure if there was a difference between the two or if they were essentially the same?
by Chesca Legaspi 2F
Fri Nov 27, 2020 6:33 pm
Forum: Octet Exceptions
Topic: Expanded Octet Question
Replies: 8
Views: 25

Re: Expanded Octet Question

As others mentioned, the reason that certain elements are able to form expanded octets is because of the presence of the d-orbital. For n = 3, d-orbitals can accommodate more electrons by participating in bonding with other atoms, therefore producing an expanded octet. But of course, for this to hap...
by Chesca Legaspi 2F
Fri Nov 27, 2020 6:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem 14A Final
Replies: 3
Views: 22

Re: Chem 14A Final

I don't think Dr. Lavelle has confirmed anything yet, but I'm assuming there'll probably be some sort of zoom proctoring session we'll have to join, most likely done by TA, and we'll take the final during that time. I'm sure there'll be some sort of accommodation for students in different time zones...
by Chesca Legaspi 2F
Sun Nov 22, 2020 3:27 am
Forum: Administrative Questions and Class Announcements
Topic: 14BL Waitlist?
Replies: 1
Views: 26

14BL Waitlist?

I'm going to try enroll in 14BL on my second pass, but I know that it has a waitlist. Does anyone know if 14BL operates like 14B where all students waitlisted get enrolled in the class eventually, or if you're only enrolled if someone actually drops the class?
by Chesca Legaspi 2F
Sun Nov 22, 2020 3:24 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Ion - Ion Interaction as an Intermolecular Force
Replies: 3
Views: 26

Re: Ion - Ion Interaction as an Intermolecular Force

I believe ion-ion interactions lead to an ionic bond. They result from two atoms with differences in electronegativity and opposite charges bonding to one another. Thank you for the clarification. Since we are talking about interactions between atoms, can I still consider ion-ion interactions as ex...
by Chesca Legaspi 2F
Sun Nov 22, 2020 3:22 am
Forum: Ionic & Covalent Bonds
Topic: Polar/ Nonpolar
Replies: 23
Views: 87

Re: Polar/ Nonpolar

An easy trick that I use to tell if a molecule is polar or not is that if a molecule has different terminal atoms or a lone pair around the central atom, it'll be polar for sure!
by Chesca Legaspi 2F
Sun Nov 22, 2020 3:20 am
Forum: Student Social/Study Group
Topic: Winter 2021 Classes
Replies: 20
Views: 138

Re: Winter 2021 Classes

Like most people have said, 12 units is the minimum, but also be aware that if you only have 12 units, you have to stick through all your classes for the quarter without dropping. If you drop any class, you'd have to enroll in another before your second pass ends in early January so that you don't f...
by Chesca Legaspi 2F
Sun Nov 22, 2020 3:18 am
Forum: Student Social/Study Group
Topic: Grading Scale for Chem14A
Replies: 22
Views: 145

Re: Grading Scale for Chem14A

In general, it typically goes that a 93+ is an A and a 90-92.9 is an A-. I think an 87-89% is a B+, but I'm not really sure what the grading scale is past that. Also, another thing to be aware of is that most STEM classes don't round your grade up so even if you have a 92.9%, that would constitute a...
by Chesca Legaspi 2F
Fri Nov 13, 2020 1:49 am
Forum: Student Social/Study Group
Topic: Conceptual Questions Resource?
Replies: 8
Views: 66

Re: Conceptual Questions Resource?

Along with khan academy, there are youtube channels like the Organic Chemistry Tutor that often review difficult chem concepts and simplify them a whole lot so they're far easier to understand. Along with explanations, those videos typically have practice problems worked into them as well so you get...
by Chesca Legaspi 2F
Fri Nov 13, 2020 1:47 am
Forum: Student Social/Study Group
Topic: Test Anxiety
Replies: 62
Views: 230

Re: Test Anxiety

I know that sometimes when I get test anxiety, I tend to spiral so something I like to try to have nearby is a grounding item -- something to look at that can bring me back to center and remind me that everything is okay. Usually, before I go into a test, I leave myself a little post it on my laptop...
by Chesca Legaspi 2F
Fri Nov 13, 2020 1:43 am
Forum: Student Social/Study Group
Topic: Studying From Home
Replies: 91
Views: 291

Re: Studying From Home

Personally, I find working with a friend on call to be really helpful. It doesn't even have to be a friend who goes to UCLA or is in the same class. Most nights, I do my work on zoom with my best friend on call in the background. We'll spend the beginning of the call catching up and then we both jus...
by Chesca Legaspi 2F
Fri Nov 13, 2020 1:38 am
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 Study Session?
Replies: 4
Views: 39

Midterm 2 Study Session?

Hi there! I'm so sorry if this has already been asked, but I couldn't find a post about it so I thought I'd post a question just in case. Does anyone know if any of the UAs or TAs are holding a review session ahead of next week's midterm? I know one of the UAs held a session last time, but I wasn't ...
by Chesca Legaspi 2F
Fri Nov 13, 2020 1:37 am
Forum: Administrative Questions and Class Announcements
Topic: Chem 14B Waitlist
Replies: 6
Views: 90

Re: Chem 14B Waitlist

No idea how many spots there are on the waitlist, but this quarter, Lavelle did admit everyone off the waitlist into Chem 14A so I'm thinking he might do the same for 14B since he's our instructor again.
by Chesca Legaspi 2F
Sun Nov 08, 2020 2:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Grading
Replies: 6
Views: 36

Re: Chemistry Community Grading

Also none of your posts from previous weeks carry over so if you miss one week but do 10 the next week, it still won't account for that week you missed :'( I've heard some people saying though that there might be future opportunities to make up chem community points if you did miss a week, but those...
by Chesca Legaspi 2F
Sun Nov 08, 2020 2:05 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem 14BL?
Replies: 7
Views: 44

Chem 14BL?

Is it recommended that we take Chem 14BL alongside Chem 14B or is it better to wait to take it until after we've finished Chem 14B? Trying to plan my class schedule for next quarter haha.
by Chesca Legaspi 2F
Sun Nov 08, 2020 1:54 pm
Forum: Student Social/Study Group
Topic: Midterm 2 Study Group
Replies: 25
Views: 112

Re: Midterm 2 Study Group

I'm so down, thank you so much for organizing this! :))
by Chesca Legaspi 2F
Sun Nov 08, 2020 1:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Solutions
Replies: 4
Views: 23

Re: Midterm Solutions

I heard that in all likelihood we won't be able to. Sometimes they like to keep the questions confidential so they can re-use them for future tests. At least, I know this is how it was for the LS7 series when I took it and it seems like a few UAs are echoing that we likely won't be able to review th...
by Chesca Legaspi 2F
Sun Nov 08, 2020 1:52 pm
Forum: Student Social/Study Group
Topic: Chemistry Among Us
Replies: 43
Views: 241

Re: Chemistry Among Us

Follow green! :)
by Chesca Legaspi 2F
Fri Oct 30, 2020 11:41 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Exam Scores
Replies: 15
Views: 105

Re: Midterm Exam Scores

Not sure how true this is, but I heard that there might have been an error in one of the questions on the midterm so because of this the TAs might have to look at some of them individually, and that might mean that grading might take a little longer than expected. :'( Hopefully, we do get them back ...
by Chesca Legaspi 2F
Fri Oct 30, 2020 11:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Audio-Visual Focus Topics
Replies: 14
Views: 91

Re: Audio-Visual Focus Topics

If there won't be any more audio-visual modules, does anyone know any other good external resources to use when it comes to simplifying/clarifying topics? Sometimes I feel like I can't fully grasp concepts from lectures alone and sometimes my schedule conflicts with step-up session times so I'm not ...
by Chesca Legaspi 2F
Fri Oct 30, 2020 11:35 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Clarification on ml quantum number
Replies: 7
Views: 66

Clarification on ml quantum number

After re-watching Lecture #10, I have come to the conclusion that I am still confused on what the ml quantum number is. I know that its values are partially determined by the value of l, but what exactly does this mean? Can someone clarify/summarize what the ml quantum number specifies and how its v...
by Chesca Legaspi 2F
Fri Oct 30, 2020 11:26 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Spin States
Replies: 2
Views: 25

Electron Spin States

Does anyone know what determines an electron's spin state? Like what would cause an electron to spin upwards rather than downwards and vice versa?
by Chesca Legaspi 2F
Fri Oct 30, 2020 10:49 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Shape of Orbitals
Replies: 8
Views: 43

Shape of Orbitals

Maybe I missed the explanation when I was watching this week's lectures, but what exactly causes orbitals to take on different shapes? Why is the s orbital shaped like a sphere and all the others are shaped so differently?
by Chesca Legaspi 2F
Fri Oct 23, 2020 10:45 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Clarification on Orbitals
Replies: 2
Views: 24

Clarification on Orbitals

Hi! I'm not sure why so much of Wednesday's lecture seemed to go over my head, but I'm a little confused on orbitals. I understand that the higher the energy of an electron, the larger its orbital will be, but how exactly does this relate to Schrodinger's Wave function? I guess what I'm asking in a ...
by Chesca Legaspi 2F
Wed Oct 21, 2020 11:33 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: What is the significance of H being a double derivative?
Replies: 1
Views: 29

What is the significance of H being a double derivative?

In lecture today, Dr. Lavelle mentioned that H is a Hamiltonian, which is a double derivative, but I still don't fully understand what this means. What is the significance of H being a double derivative? Does that mean it's a constant of some sort?
by Chesca Legaspi 2F
Mon Oct 19, 2020 11:41 am
Forum: DeBroglie Equation
Topic: Quantum Mechanics Description of Atoms
Replies: 1
Views: 16

Quantum Mechanics Description of Atoms

In today's lecture, we learned that electrons are described as a "circular standing wave" around the nucleus, but what exactly is a circular standing wave? How are they different from other types of waves? And are electrons the only particles that form waves in this pattern?
by Chesca Legaspi 2F
Mon Oct 19, 2020 11:28 am
Forum: DeBroglie Equation
Topic: What does it mean for "mass to dominate?"
Replies: 2
Views: 15

What does it mean for "mass to dominate?"

During today's lecture (10/19), when describing the DeBroglie Equation and its application to electron movement, Dr. Lavelle frequently mentioned that "mass would dominate" against momentum/speed, but I still don't quite understand what this means. Could someone please explain?
by Chesca Legaspi 2F
Sat Oct 17, 2020 12:28 am
Forum: Significant Figures
Topic: Sig Figs and Constants on Exams
Replies: 9
Views: 80

Sig Figs and Constants on Exams

On Dr. Lavelle's site, there's a link to a document with constants (like the speed of light and Planck's constant) that I'm assuming we can use on exams. However, I noticed that some of these constants are fairly long. Are we allowed to round these constants to make them shorter when doing our calcu...
by Chesca Legaspi 2F
Sat Oct 17, 2020 12:23 am
Forum: Properties of Light
Topic: Energy Levels
Replies: 11
Views: 64

Re: Energy Levels

Can electrons jump up multiple energy levels at once or do they have to reach a certain stage before they can reach the next energy level afterwards? For example, if an electron was at energy level n = 1, could it jump up to n = 4, or would it have to pass/stop(?) through energy levels n = 2 and n =...
by Chesca Legaspi 2F
Sat Oct 17, 2020 12:20 am
Forum: Properties of Light
Topic: Spectral Lines
Replies: 11
Views: 81

Re: Spectral Lines

Spectral lines are lines that denote certain light frequencies. By exciting an atom, the frequency of light given by that atom is unique to that atom. It is important in spectroscopic analysis of the light given off by excited atoms, thus showing only the photons of a particular energy to be given ...
by Chesca Legaspi 2F
Sat Oct 17, 2020 12:15 am
Forum: Significant Figures
Topic: Partial Credit for wrong sig figs?
Replies: 4
Views: 39

Partial Credit for wrong sig figs?

Hi! I was wondering if we'd be able to receive partial credit on an exam if we did all the steps of a problem correctly, but rounded significant figures wrong, or if we'd get the entire question wrong. Just wondering because I've had previous classes that have marked questions completely wrong for a...
by Chesca Legaspi 2F
Sat Oct 17, 2020 12:06 am
Forum: Photoelectric Effect
Topic: Question about Short Wavelengths vs. Long Wavelengths
Replies: 6
Views: 59

Question about Short Wavelengths vs. Long Wavelengths

In lecture, Dr. Lavelle said that photons require certain unique levels of energy in order to be excited and subsequently ejected from surfaces, and that this is the reason why light at shorter wavelengths can eject electrons even at low intensities while light at longer wavelengths cannot eject ele...
by Chesca Legaspi 2F
Mon Oct 12, 2020 3:28 pm
Forum: Properties of Light
Topic: Question about amount of energy needed to emit electrons
Replies: 6
Views: 43

Question about amount of energy needed to emit electrons

In today's lecture, 10/12/20, Professor Lavelle mentioned that unless E(Photon) >= E(Energy Remove e-), electrons will not be emitted even for high intensity light. Why is the requirement greater than or equal to instead of just greater than? If the amount of energy in the photon was exactly the sam...
by Chesca Legaspi 2F
Sat Oct 10, 2020 3:36 pm
Forum: Administrative Questions and Class Announcements
Topic: All Assignments
Replies: 8
Views: 56

Re: All Assignments

As most other people have already said, the only things due at the end of each week are the Sapling HW problems and the chem community posts by Sunday at 11:59 PM. Also, while some people have already mentioned textbook problems being an additional resource, going to the step up sessions also helps ...
by Chesca Legaspi 2F
Sat Oct 10, 2020 3:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Step Up Sessions
Replies: 71
Views: 4413

Re: Step Up Sessions

If we miss a step up session, do worksheets from the sessions get posted online? Or is the only way to get the extra practice problems to attend them live? Just wondering because sometimes my schedule makes it a little hard to attend things live :')
by Chesca Legaspi 2F
Sat Oct 10, 2020 3:23 pm
Forum: Significant Figures
Topic: What Value to Use for Sig Figs
Replies: 4
Views: 23

Re: What Value to Use for Sig Figs

When you're doing multiplication/division with sig figs, your answer should match the number of sig figs of the least precisely known number in the calculation. So if you were doing multiplication or division using the numbers 5.9 g and 8.79 g, your answer should be rounded to 2 sig figs.
by Chesca Legaspi 2F
Wed Oct 07, 2020 12:06 am
Forum: Significant Figures
Topic: What is the reason why we do not count integers for sig figs?
Replies: 8
Views: 79

Re: What is the reason why we do not count integers for sig figs?

You do count integers for sig figs. Any non-zero integer is a significant figure so both 70 and 80 would have 1 significant figure each while 65 would have 2 because there are 2 non-zero digits. All non-zero digits are significant. Zeroes are only significant if they follow a decimal point or are in...
by Chesca Legaspi 2F
Wed Oct 07, 2020 12:03 am
Forum: Student Social/Study Group
Topic: GroupMe Link for Dis 2F
Replies: 1
Views: 25

GroupMe Link for Dis 2F

Hey does anyone know if there's a groupme link for discussion 2F?

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