Search found 43 matches

by apples
Fri Nov 20, 2020 8:27 am
Forum: Bond Lengths & Energies
Topic: Textbook Question 3F.15
Replies: 7
Views: 37

Re: Textbook Question 3F.15

AsF3 would have a higher boiling point than AsF5 because it is a polar molecule that has Dipole-Dipole and LDF. AsF5 only experiences LDF because all of the Fluorines are pulling it equally. Could you please walk me through how you realized that AsF5 is a polar molecule? Hey! Sorry AsF3 is the pola...
by apples
Thu Nov 19, 2020 7:14 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Inorganic and Organic
Replies: 4
Views: 36

Re: Inorganic and Organic

Organic compounds always contain carbon while inorganic compounds contain metal and other elements.

I'm working through the textbook problems now and will reply if I find any about this topic.
by apples
Thu Nov 19, 2020 6:23 pm
Forum: Bond Lengths & Energies
Topic: Textbook Question 3F.15
Replies: 7
Views: 37

Re: Textbook Question 3F.15

Selena Quispe 2G wrote:AsF3 would have a higher boiling point than AsF5 because it is a polar molecule that has Dipole-Dipole and LDF. AsF5 only experiences LDF because all of the Fluorines are pulling it equally.


Could you please walk me through how you realized that AsF5 is a polar molecule?
by apples
Thu Nov 19, 2020 6:20 pm
Forum: Student Social/Study Group
Topic: grade worries
Replies: 97
Views: 582

Re: grade worries

I know we are all worried, but we got this!! Just a few more weeks.
by apples
Thu Nov 19, 2020 6:18 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Quantum number ms
Replies: 3
Views: 16

Re: Quantum number ms

Thanks for clearing that up guys!
by apples
Thu Nov 19, 2020 6:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 3d fills before or after 4s?
Replies: 7
Views: 38

Re: 3d fills before or after 4s?

Oh ahhhh that makes more sense, thank you guys!
by apples
Thu Nov 19, 2020 6:17 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability vs Polarizing Power in anions/cations & bonding
Replies: 9
Views: 40

Re: Polarizability vs Polarizing Power in anions/cations & bonding

To add on in terms of periodic trends Polarizability decreases as it goes across a period and increases as it goes down a group. This is because the greater the number of electrons, the less control the nuclear charge has on charge distribution, and thus the increased polarizability of the atom. As ...
by apples
Thu Nov 19, 2020 2:00 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 3d fills before or after 4s?
Replies: 7
Views: 38

3d fills before or after 4s?

For textbook problem 2A.5 it asks to give the ground-state electron configuration expected for Cu+ I thought the answer would be [Ar]3d^8 4s^2 since 4s has a lower energy than 3d and would fill up first. However the answer is [Ar]3d^10. Why doesn't the 4s fill up first? What is the order of the elec...
by apples
Mon Nov 16, 2020 2:07 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Quantum number ms
Replies: 3
Views: 16

Quantum number ms

How do you know if the quantum number ms (spin) is +½ or -½? Is the purpose of knowing that ms can be +½ or -½ only used for know that the arrows in the electron configuration have opposite spins?
by apples
Mon Nov 16, 2020 1:21 pm
Forum: Administrative Questions and Class Announcements
Topic: 14B Next Quarter
Replies: 8
Views: 105

Re: 14B Next Quarter

Lavelle is accepting everyone off of the waitlist. Lavelle is not sure if the class will have asynchronous lectures next quarter. Check these posts by Lavelle out: - https://lavelle.chem.ucla.edu/forum/viewtopic.php?t=67049 - https://lavelle.chem.ucla.edu/forum/viewtopic.php?t=67067 - https://lavell...
by apples
Mon Nov 16, 2020 1:11 pm
Forum: Dipole Moments
Topic: Bonds on MT2?
Replies: 1
Views: 26

Bonds on MT2?

What are the different type of bonds do we need to know for the MT2 and how do they differ?
by apples
Mon Nov 16, 2020 1:08 pm
Forum: Student Social/Study Group
Topic: Exercising Our Minds and Bodies
Replies: 84
Views: 245

Re: Exercising Our Minds and Bodies

I enjoy swimming in the ocean, going on hikes, and not going to lie TikTok dances are a workout!
by apples
Mon Nov 16, 2020 1:06 pm
Forum: Dipole Moments
Topic: Dipole moment vs dipole bond
Replies: 5
Views: 30

Re: Dipole moment vs dipole bond

I think you are asking the difference between bond dipole/dipole moments formula and dipole-dipole forces. Dipole-Dipole Forces are intermolecular attractions between two molecules. They are the weakest bonds and all polar covalent compounds have them The dipole moments formula measure the polarity ...
by apples
Mon Nov 16, 2020 12:59 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Polarizability
Replies: 3
Views: 26

Re: Polarizability

To add on even more, polarizability tends to decrease from left to right since the atomic radius and the number of electrons decreases.
by apples
Mon Nov 16, 2020 12:57 pm
Forum: Student Social/Study Group
Topic: Midterm 2 content
Replies: 20
Views: 78

Re: Midterm 2 content

The only equation that I think we will need to know is Formal Charge: Formal Charge of Atom = V - L - B/2 - V - Valence Electrons of Atom - found using the periodic table of elements - L # of Lone Electrons on Atom - these are the lone individual electrons - B/2 # bonded electrons with Atom/2 - each...
by apples
Mon Nov 16, 2020 12:53 pm
Forum: Student Social/Study Group
Topic: Test Anxiety
Replies: 62
Views: 229

Re: Test Anxiety

Deep breathes throughout the whole test. Also remember that you have prepared, you just have to show your learning here. Take it slow and read the questions veryyy carefully.
by apples
Mon Nov 16, 2020 12:52 pm
Forum: General Science Questions
Topic: midterm 2
Replies: 4
Views: 43

Re: midterm 2

In Lavelle's 17th lecture he said you will not need to calculate dipole moments. Just know that increase in bond length increases the dipole moments.
by apples
Mon Nov 16, 2020 12:51 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Periodic Table Trends
Replies: 4
Views: 22

Re: Periodic Table Trends

The polarizing power increases from left to right across a period and decreases down columns of the periodic table.

Polarizability decreases from left to right and increases down columns of the periodic table.
by apples
Thu Nov 12, 2020 9:52 pm
Forum: Ionic & Covalent Bonds
Topic: Sapling HW Question 13
Replies: 3
Views: 31

Re: Sapling HW Question 13

We know that a hydrogen bond forms when there is a hydrogen bonded to two very electronegative molecules. Both a nitrogen atom and oxygen atom, with an unshared pair of electrons, can form a hydrogen bond by bonding to a hydrogen (of a water molecule). Also, if a Hydrogen is already bonded to nitrog...
by apples
Thu Nov 12, 2020 9:41 pm
Forum: Lewis Structures
Topic: Sapling #2-Formal Charge
Replies: 3
Views: 22

Re: Sapling #2-Formal Charge

You find formal charge using this formula: Formal Charge of Atom = Valence Electrons of Atom - # of Lone Electrons on Atom - # bonded electrons with Atom/2. - Valence Electrons of Atom - found using the periodic table of elements - # of Lone Electrons on Atom - these are the lone individual electron...
by apples
Wed Nov 04, 2020 3:38 pm
Forum: Student Social/Study Group
Topic: Constants and Equations Page
Replies: 8
Views: 44

Re: Constants and Equations Page

Yep have to memorize but here is how I remember it:

Freddy Can't Vacant Nashville Before 2

FC = V - N - B/2

Not sure how helpful that is for you, but it sticks in my head.
by apples
Wed Nov 04, 2020 3:33 pm
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 135
Views: 438

Re: Favorite TV shows

I recently binged Grand Army and The Queen's Gambit on Netflix. would recommend both!
by apples
Thu Oct 29, 2020 7:17 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: h vs. ħ?
Replies: 11
Views: 88

h vs. ħ?

Can you explain the difference between h (6.62607015×10−34) and ħ (h-bar) (1.054571817×10−34) to me please?

And when do we use the 1) formula and the 2) formula?

1) ∆p ∆x ≥ h/4π
2) ∆p ∆x = (1/2) ħ

Thank youuuuu
by apples
Thu Oct 29, 2020 7:33 am
Forum: Student Social/Study Group
Topic: Lavelle's Jokes
Replies: 18
Views: 174

Re: Lavelle's Jokes

These 2 make me kinda sad :( But the drawings are cute.
by apples
Mon Oct 26, 2020 3:17 pm
Forum: Administrative Questions and Class Announcements
Topic: Constants, Equations, and Periodic Table
Replies: 3
Views: 25

Re: Constants, Equations, and Periodic Table

You should use the ones he emailed us.

Here are the links to them

Constants/Equations: https://lavelle.chem.ucla.edu/wp-conten ... ations.pdf

Periodic Table: https://lavelle.chem.ucla.edu/wp-conten ... _IUPAC.pdf
by apples
Mon Oct 26, 2020 3:14 pm
Forum: Administrative Questions and Class Announcements
Topic: Calculator Tip
Replies: 1
Views: 43

Calculator Tip

Hey Guys I thought I would share this tip. I recommend storing constants in your calculator so you don't have to type them out all the time. This helps me be faster and not make silly mistakes (like incorrectly copying the constant value). How to do this is: 1) Enter the number in your calculator 2)...
by apples
Mon Oct 26, 2020 2:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Sapling Homework Score
Replies: 3
Views: 26

Re: Sapling Homework Score

I think it is best to worry about that if it continues to happen after the due date since it will probably update everything once it is all due.
by apples
Mon Oct 26, 2020 1:58 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm topics and information
Replies: 8
Views: 83

Re: Midterm topics and information

My guess is that you would be fine with just reading the textbook. From my understanding the textbook problems are the ones the exam is based on so making sure you understand that would be best. Also doing the audio visual practice problems.
by apples
Mon Oct 26, 2020 1:52 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sapling HW Q18
Replies: 1
Views: 17

Re: Sapling HW Q18

The atomic radius of atoms generally decreases from left to right across a period.And increase from top to bottom. Check out the image I attached. Also the gain of an electron adds more electrons to the outermost shell and the pull towards the nucleus so the pull becomes slightly weaker so it causes...
by apples
Mon Oct 26, 2020 1:42 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sapling HW Q21
Replies: 4
Views: 38

Re: Sapling HW Q21

The less valence electrons an atom has, the least likely it will gain electrons. Electron affinity increases the further right and up that you go on a periodic table. So these elements in order from top to bottom: Be, Se, Br.
by apples
Mon Oct 26, 2020 1:32 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 196
Views: 837

Re: How are you studying?

Day Preciado 1H wrote:Reading some of the posts have been helpful, I'm personally struggling keeping track of material.


I agree. All these tips have been so helpful and I have been able to implement them into my studying.
by apples
Mon Oct 26, 2020 1:30 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 196
Views: 837

Re: How are you studying?

Javier Perez M 2J wrote:Will we be provided with conversion units for the exam? (such as how many nanometers are in a meter and ml in a liter)
Or are we expected to memorize this?


I think we are going to have to memorize that. But you will be given constants.
by apples
Wed Oct 21, 2020 5:10 pm
Forum: Einstein Equation
Topic: Scratch paper during the exam
Replies: 19
Views: 139

Scratch paper during the exam

Hey guys, just saw Prof's email about the exam and he said we "can write on the front and back of the Constants and Equations, and Periodic Table if they want (for their rough work)." Are we able to have more sheets of scratch paper or just those 2 sheets?
by apples
Sat Oct 17, 2020 9:57 am
Forum: Student Social/Study Group
Topic: How do you study?
Replies: 19
Views: 115

Re: How do you study?

Something I like to do is recap everything I learned for each week. Takes about an hour of compiling my notes and I format it to look like a cheatsheet. This way by the time of the midterm or the final I would already have a study guide! Hope this helps.
by apples
Sat Oct 17, 2020 9:51 am
Forum: Student Social/Study Group
Topic: Need suggestions on study websites
Replies: 4
Views: 142

Re: Need suggestions on study websites

You should check out Brainscape!
by apples
Sat Oct 17, 2020 9:49 am
Forum: Properties of Light
Topic: Lecture Music [ENDORSED]
Replies: 6
Views: 102

Re: Lecture Music [ENDORSED]

The music is so uplifting and gets me in the mood to learn! Really glad that prof starts classes this way :)
by apples
Sat Oct 17, 2020 9:48 am
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 196
Views: 837

How are you studying?

Hi, I am having trouble being on top of my work so I was hoping so of you guys could kinda walk me through how you stay on top of Chem. Also do you have any tips on how to study for the midterm coming up?
by apples
Sat Oct 17, 2020 9:46 am
Forum: Administrative Questions and Class Announcements
Topic: Where can I buy a webcam for a reasonable price?
Replies: 60
Views: 923

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

If you have a phone with a camera and can download zoom on it you do not need to purchase an additional webcam. On the day of the exam, you can login onto your zoom via your phone and set it up to face your workspace while taking the test on your laptop. Also my TA said they make it so that you can ...
by apples
Sat Oct 17, 2020 9:42 am
Forum: Properties of Light
Topic: Question regarding webcam
Replies: 8
Views: 68

Re: Question regarding webcam

With my TA session we had to use our phones because my TA had some technical difficulties and was not able to make it so you could have zoom and the lockdown browser open at the same time. If this happens again for the final. You will want to use your computer and your phone. With your phone you con...
by apples
Thu Oct 08, 2020 1:12 pm
Forum: Student Social/Study Group
Topic: Textbook Readings on Fundamental Topics
Replies: 5
Views: 55

Re: Textbook Readings on Fundamental Topics

I think focusing on the fundamental readings, practice problems (textbook, sapling), and lectures/TA lectures is the best way to go and make sure that you are prepared for all the midterms and final exam. He won't test us on something he didn't talk about or tell us to go over!
by apples
Thu Oct 08, 2020 1:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 221
Views: 116123

Re: Advice from a Medical Student [ENDORSED]

thank you so much, this was so helpful!
by apples
Thu Oct 08, 2020 1:02 pm
Forum: Student Social/Study Group
Topic: STEM clubs
Replies: 8
Views: 89

Re: STEM clubs

Hi, I have a few recs:
Crux Ucla
The Neuroscience Undergraduate Society
The Cognitive Science Student Association

Those are all neuroscience ones, but if you go to @uclaeaf there are SOO many posts about the clubs really nicely organized.
https://www.instagram.com/uclaeaf/

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