Search found 53 matches

by Lillian
Sun Dec 06, 2020 11:28 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8545
Views: 1474676

Re: Post All Chemistry Jokes Here

What's H204?
Depends. If you're thirsty, drinking. If you're dirty, washing.
by Lillian
Sun Dec 06, 2020 11:20 pm
Forum: Air Pollution & Acid Rain
Topic: acid rain
Replies: 10
Views: 186

Re: acid rain

He mentioned the processes involved in acid rain and the recent spike in carbon dioxide in our atmosphere. Not sure if there's more..
by Lillian
Sun Dec 06, 2020 11:17 pm
Forum: Student Social/Study Group
Topic: Practice Exam for Final
Replies: 23
Views: 257

Re: Practice Exam for Final

Halle Villalobos 3C wrote:Hi! I believe there is a link to a google drive test bank folder in the class GroupMe that has past exams. Good luck with finals!

Ooohh! Noted!
by Lillian
Sun Dec 06, 2020 11:16 pm
Forum: Student Social/Study Group
Topic: Practice Exam for Final
Replies: 23
Views: 257

Re: Practice Exam for Final

505598869 wrote:Textbook problems are my best friends at the moment... my only friends...

I feel that... I haven't been able to meet up with my friends >:,)
by Lillian
Sun Dec 06, 2020 11:13 pm
Forum: Student Social/Study Group
Topic: Plans for Relaxing After Finals
Replies: 98
Views: 459

Re: Plans for Relaxing After Finals

I'm going to sleep until my organs fail, obviously.
by Lillian
Sun Dec 06, 2020 11:08 pm
Forum: Student Social/Study Group
Topic: Point distribution
Replies: 11
Views: 103

Re: Point distribution

I feel like Lavelle did a lot for us this quarter, especially in this situation, but I can't help but sometimes wish for more, ya know? I wish the classes were in person because the videos do NOT help me to focus at all. I did get through them, but man, was it difficult to focus without a live lectu...
by Lillian
Sun Nov 29, 2020 10:04 pm
Forum: Dipole Moments
Topic: 2E #29
Replies: 7
Views: 32

Re: 2E #29

You look at the electronegativity in each of the atoms (Cl are the more electronegative ones), then determine where the charge is being pulled. If the atom is uneven like it is in 1, the less the pull cancels out, leading to a larger dipole moment :) Hope this helps
by Lillian
Sun Nov 29, 2020 10:02 pm
Forum: Student Social/Study Group
Topic: Professor Lavelle's hat
Replies: 17
Views: 220

Re: Professor Lavelle's hat

I would love to hear professor Lavelle's input on this. I've been thinking the same thing haha. Ey it might not be the best idea to have your name as your student ID. It's kinda important, man. My bad, didn't notice that I had it as that. Does UID fraud actually happen? You're probably good lolol. ...
by Lillian
Sun Nov 29, 2020 5:37 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 226
Views: 36003

Re: Final Jitters

Make sure you stand up and stretch every 20-30 minutes when you study! Give yourself enough breaks so that your brain has time to process the information as you pick it up. It's really good for both physically and mentally (we need as much of that during this pandemic lol).
by Lillian
Sun Nov 29, 2020 5:35 pm
Forum: Student Social/Study Group
Topic: Happy Thanksgiving!
Replies: 38
Views: 286

Re: Happy Thanksgiving!

Happy late Thanksgiving hehe! My family loves going on trips to the mountains to hike and chill, although this year was a bit different... I did eat a lot of food and play lots of Animal Crossing so I'm pretty content :DD
by Lillian
Sun Nov 29, 2020 5:31 pm
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 178
Views: 931

Re: Favorite TV shows

I think it's a war crime to not mention Adventure Time and Over the Garden Wall. *chef's kiss*
Also if you want a really good but extremely gory (to the point where you'll be surprised it even aired) show, watch Hannibal.
by Lillian
Sun Nov 29, 2020 5:20 pm
Forum: Student Social/Study Group
Topic: Professor Lavelle's hat
Replies: 17
Views: 220

Re: Professor Lavelle's hat

305311217 wrote:I would love to hear professor Lavelle's input on this. I've been thinking the same thing haha.


Ey it might not be the best idea to have your name as your student ID. It's kinda important, man.
by Lillian
Sun Nov 29, 2020 5:20 pm
Forum: Student Social/Study Group
Topic: Professor Lavelle's hat
Replies: 17
Views: 220

Re: Professor Lavelle's hat

It walks on the line between blurry and clear and I get distracted by it so I have to skip back a lot to see what he said lol
by Lillian
Sun Nov 29, 2020 5:17 pm
Forum: Student Social/Study Group
Topic: Final Study
Replies: 32
Views: 199

Re: Final Study

I've mostly been reviewing the problems like a lot of other people, but I think skimming through the lectures is a pretty good way to review as well :)
by Lillian
Sun Nov 29, 2020 5:17 pm
Forum: Student Social/Study Group
Topic: Final Study
Replies: 32
Views: 199

Re: Final Study

I have been reviewing problems in the book and on Sapling. Are there any specific Youtube channels anyone can recommend that effectively review this course's material? Personally, I watch organic chemistry tutor on youtube when I need clarification on concepts! The videos are very detailed, clear, ...
by Lillian
Sun Nov 29, 2020 5:09 pm
Forum: Dipole Moments
Topic: Sapling #13
Replies: 9
Views: 53

Re: Sapling #13

Adding onto this, I ended up figuring this out, but I'm still confused about the exact number, I counted the atoms most likely to form a Hydrogen bond but that number was less than the number I ended up getting. The exact amount is 8 I'm pretty sure. For each hydrogen atoms, the oxygen in a water m...
by Lillian
Sun Nov 29, 2020 5:08 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: dipole moments
Replies: 10
Views: 54

Re: dipole moments

Follow Dr. Lavelle! The arrow should be pointing towards the negative dipole, because it indicates where electrons are being pulled. What determines the negative dipole again? The more electronegative atom has the negative dipole because it pulls electrons toward itself more! Electronegativity incr...
by Lillian
Mon Nov 16, 2020 12:02 am
Forum: Dipole Moments
Topic: Sapling #13
Replies: 9
Views: 53

Re: Sapling #13

Adding onto this, I ended up figuring this out, but I'm still confused about the exact number, I counted the atoms most likely to form a Hydrogen bond but that number was less than the number I ended up getting. The exact amount is 8 I'm pretty sure. For each hydrogen atoms, the oxygen in a water m...
by Lillian
Sun Nov 15, 2020 9:46 pm
Forum: Bond Lengths & Energies
Topic: Sapling #4
Replies: 4
Views: 33

Re: Sapling #4

Bond character refers to how strong the attraction is (how short the bond length is). Even if you don't know, you can assume that, from the chart they give you, the C-N and C-O bonds aren't "overwhelmingly" strong and the C=N and C=O bonds are pretty short. From this you can assume that th...
by Lillian
Sun Nov 15, 2020 9:41 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: dipole moments
Replies: 10
Views: 54

Re: dipole moments

SashaAnand3G wrote:Follow Dr. Lavelle! The arrow should be pointing towards the negative dipole, because it indicates where electrons are being pulled.


What determines the negative dipole again?
by Lillian
Sun Nov 15, 2020 9:40 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Length
Replies: 6
Views: 42

Bond Length

I wasn't really clear on this from the lectures, but what is the significance of bond length in determining the stability of structures? And what does a shorter bond length really entail?
by Lillian
Sun Nov 15, 2020 9:38 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi bonds
Replies: 9
Views: 66

Re: Sigma and Pi bonds

Do we need to know the details of the difference between sigma, pi, and delta bonds?
Or just this?:
single bond = 1 sigma
double bond = 1 sigma 1 pi
triple bond = 1 sigma 2 pi
quadruple bond = 1 sigma 2 pi 1 delta
by Lillian
Sun Nov 15, 2020 9:33 pm
Forum: Ionic & Covalent Bonds
Topic: Periodic Table and Equation Sheet
Replies: 11
Views: 72

Re: Periodic Table and Equation Sheet

This is pretty off-topic, but I think I may have missed some information during the discussions... I don't know where to find the given periodic table and equations sheet to print. Can someone point me towards it? Thanks :) You can find it on the tops of the class website under "Constants and ...
by Lillian
Sun Nov 15, 2020 9:32 pm
Forum: Ionic & Covalent Bonds
Topic: Periodic Table and Equation Sheet
Replies: 11
Views: 72

Re: Periodic Table and Equation Sheet

They are on Dr. Lavelle's website, but I'll provide you direct links to make it easier: Constants and Equations: https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14A/constants_equations.pdf Periodic Table: https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14A/Periodic_Table...
by Lillian
Sun Nov 15, 2020 3:21 pm
Forum: Ionic & Covalent Bonds
Topic: Periodic Table and Equation Sheet
Replies: 11
Views: 72

Periodic Table and Equation Sheet

This is pretty off-topic, but I think I may have missed some information during the discussions... I don't know where to find the given periodic table and equations sheet to print. Can someone point me towards it? Thanks :)
by Lillian
Mon Nov 09, 2020 12:13 am
Forum: Significant Figures
Topic: 0's
Replies: 21
Views: 194

Re: 0's

Would the middle zeros have significance? like in 202.
by Lillian
Mon Nov 09, 2020 12:12 am
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 93
Views: 49679

Re: How to find my posts

Is there any way to search the contents of a post? For example if there aren't any posts on a certain problem that I can find with the subject name, can a search direct me to the next closest thing?
by Lillian
Mon Nov 09, 2020 12:07 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: What are orbitals?
Replies: 10
Views: 112

Re: What are orbitals?

To my knowledge, orbitals are more representations of where the electron can be found at any given time. For example, with an s orbital, there's a sphere of space where the electron can be found, whereas with the p orbital it's more of a peanut shape. Is that all we need to know conceptually as far...
by Lillian
Mon Nov 09, 2020 12:05 am
Forum: Trends in The Periodic Table
Topic: positive and negative ion
Replies: 14
Views: 75

Re: positive and negative ion

The negative ion would have a larger radius because in this case, the nuclear charge stays the same (if they're the same element). The only thing that would be changing is the number of electrons, meaning the radius would be bigger. I understand the size of the radius correlating with whether it is...
by Lillian
Mon Nov 09, 2020 12:03 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids/Bases
Replies: 7
Views: 83

Acids/Bases

What exactly determines the strength of an acid/base? Didn't really understand if there was a concept that I needed to know for this or there was an equation to determine this.
by Lillian
Sun Nov 01, 2020 10:32 pm
Forum: Trends in The Periodic Table
Topic: Tips for remembering
Replies: 14
Views: 106

Re: Tips for remembering

Left and down = bigger radius.
The rest, I memorized as is... I do hope there's a better way than this lol
by Lillian
Sun Nov 01, 2020 10:27 pm
Forum: Trends in The Periodic Table
Topic: Sapling question 24
Replies: 3
Views: 28

Re: Sapling question 24

The fluorine atom has a higher number of protons in its nucleus (meaning there is a higher charge that attracts electrons). Because of this, the attraction would be higher :)
by Lillian
Sun Nov 01, 2020 10:26 pm
Forum: Trends in The Periodic Table
Topic: positive and negative ion
Replies: 14
Views: 75

Re: positive and negative ion

The negative ion would have a larger radius because in this case, the nuclear charge stays the same (if they're the same element). The only thing that would be changing is the number of electrons, meaning the radius would be bigger.
by Lillian
Sun Nov 01, 2020 10:24 pm
Forum: Trends in The Periodic Table
Topic: Sapling #28
Replies: 3
Views: 24

Re: Sapling #28

With this specific set of ions, we can see that all of them have the same number of total electrons. The only difference is their nuclear mass and charge. The more protons the atom has, the more attraction it holds on the electrons, which brings them closer to the nucleus (like a magnet). :D Hope th...
by Lillian
Sun Nov 01, 2020 10:21 pm
Forum: *Shrodinger Equation
Topic: Midterm Scores
Replies: 30
Views: 336

Re: Midterm Scores

I'm guessing the midterm scores will be released later this week. Maybe. No idea of knowing for sure with college.
by Lillian
Sun Nov 01, 2020 10:19 pm
Forum: *Shrodinger Equation
Topic: Schrodinger Equation
Replies: 5
Views: 61

Re: Schrodinger Equation

I've been wondering the same. How would we compute the variables, which variables would be given, and where would we see this equation being used and what for?
by Lillian
Sun Nov 01, 2020 10:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Participation Points [ENDORSED]
Replies: 62
Views: 1016

Re: Participation Points [ENDORSED]

Do you know when the participation points are recorded? Are they just at midnight on Sunday?
by Lillian
Sun Oct 25, 2020 11:53 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8545
Views: 1474676

Re: Post All Chemistry Jokes Here

Q: Wanna hear a chemistry joke?
A: Na.
by Lillian
Sun Oct 25, 2020 11:38 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Midterm 1
Replies: 18
Views: 206

Re: Midterm 1

You will definitely need to know it for the midterm, but I wouldn't stress too much over it to the point of not studying for other topics. It's only one topic out of many we've covered so make sure that you know the basics of it I guess.
by Lillian
Sun Oct 25, 2020 11:33 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: N reaching infinity
Replies: 3
Views: 18

Re: N reaching infinity

Physically, it is impossible for an electron to reach n = infinity. As long as there is a "distance" between an electron and an atom, there will be some attraction, though it would be EXTREMELY small. So unless there is a way to reach a length of "infinity" between an atom and an...
by Lillian
Sun Oct 25, 2020 11:30 pm
Forum: Photoelectric Effect
Topic: Intensity vs. Frequency
Replies: 22
Views: 140

Re: Intensity vs. Frequency

For something like a photon, the intensity would refer to the the number of photons sent at a target or in a certain direction. The frequency would refer to how many crests or troughs pass through a certain point in a wave. The amplitude, just in case, refers to the height of the crest or trough.
by Lillian
Sun Oct 25, 2020 11:25 pm
Forum: *Black Body Radiation
Topic: Midterm 1
Replies: 15
Views: 291

Re: Midterm 1

Black Body Radiation is not on the midterm. He said in one of the lectures that it wouldn't be on the test, nor is it part of the curriculum (I think).
by Lillian
Sun Oct 18, 2020 9:34 pm
Forum: Photoelectric Effect
Topic: In a Vacuum
Replies: 7
Views: 35

Re: In a Vacuum

In addition to offsetting the electron's velocity, it could also interact as in bind with the electron, absorb the energy of the electron, pull it in its direction, etc. It would directly affect the experiment's results.
by Lillian
Sun Oct 18, 2020 9:30 pm
Forum: Photoelectric Effect
Topic: Calculate the work function, Φ, of this metal.
Replies: 3
Views: 46

Re: Calculate the work function, Φ, of this metal.

Calculate the energy of the proton, subtract the kinetic energy of the election from the energy of the proton, then you have the threshold energy :))))
by Lillian
Sun Oct 18, 2020 9:26 pm
Forum: Einstein Equation
Topic: m vs nm
Replies: 66
Views: 462

Re: m vs nm

The test'll be in multiple choice anyway, but you'd adjust the answer to match the question.

eg.) How many nm does the electron travel?
answer: ____nm

eg.) How many m does the electron travel?
answer: ____m
by Lillian
Sun Oct 18, 2020 9:23 pm
Forum: Properties of Electrons
Topic: The Quantum World
Replies: 7
Views: 36

Re: The Quantum World

I think maybe the electron wouldn't really move from the surface, but it would still be physically separated from the other atoms/electrons (it wouldn't be bound). Then again, that's a pretty rare scenario, for the energy of the photon to match the threshold energy exactly haha :DD
by Lillian
Sun Oct 18, 2020 9:17 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 203
Views: 1298

Re: How are you studying?

For me, it's all about doing the assigned problems and maybe even going out of your way to look for example problems from different sources (if you can). Chemistry's all about problem solving and learning the concepts as you go along. Though, for the tests Lavelle will assign, I'd recommend really f...
by Lillian
Sun Oct 18, 2020 9:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Where can I buy a webcam for a reasonable price?
Replies: 60
Views: 1102

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

I have been looking up prices for webcam on amazon but all of them are above $35 and my budge is around $25. Anybody know where I can find a webcam for cheap price? if you purchased one, can you drop the link for the website below This is a 1080 HD camera you can get off of Amazon: https://www.amaz...
by Lillian
Fri Oct 09, 2020 9:54 am
Forum: SI Units, Unit Conversions
Topic: Do I need to do very single textbook question on the syllabus?
Replies: 34
Views: 274

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

I mean, the textbook problems can only help, right?
by Lillian
Fri Oct 09, 2020 9:54 am
Forum: SI Units, Unit Conversions
Topic: Sig figs and molar mass
Replies: 18
Views: 101

Re: Sig figs and molar mass

I don't think Lavelle will mind either way, especially since all the interactions and quizzes/tests are multiple choice. But like many others have said, using the most sig figs as possible until you have the final answer is best :)
by Lillian
Fri Oct 09, 2020 9:52 am
Forum: SI Units, Unit Conversions
Topic: Textbook
Replies: 22
Views: 181

Re: Textbook

If I'm not wrong, Lavelle sent us a pdf of the textbook, no?
by Lillian
Fri Oct 09, 2020 9:49 am
Forum: SI Units, Unit Conversions
Topic: How to Show Your Work
Replies: 16
Views: 144

Re: How to Show Your Work

Natalie Phan 3G wrote:From what I've heard from my TA, the exams will be multiple choice. So no need to show work! Some people prefer to write out super neat and detailed work, but it is not a necessity when it comes to grading on the tests. So whatever you want to show is fine!

Oh that's good. Thanks for the heads up!
by Lillian
Fri Oct 09, 2020 9:48 am
Forum: SI Units, Unit Conversions
Topic: When to convert units?
Replies: 12
Views: 100

Re: When to convert units?

I was actually wondering if Lavelle checked for work. Do we have to show every step in solving the problems?

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