Search found 46 matches

by Jamie Wang 3G
Thu Dec 03, 2020 4:48 am
Forum: Naming
Topic: what does (en) mean?
Replies: 6
Views: 27

Re: what does (en) mean?

Stephen Min 2K wrote:I think we do need to memorize en since it is a common ligand that we will probably use going forward. Its also on the common ligand table.

Where can we find the common ligand table used for this class?
by Jamie Wang 3G
Thu Dec 03, 2020 4:46 am
Forum: Student Social/Study Group
Topic: How are you?
Replies: 18
Views: 91

Re: How are you?

Really excited to start new classes! Our first finals are kind of scaring me though.
by Jamie Wang 3G
Thu Dec 03, 2020 4:40 am
Forum: Determining Molecular Shape (VSEPR)
Topic: AX3E2 T shaped?
Replies: 1
Views: 7

AX3E2 T shaped?

Why would AX3E2 be t shaped if lone pairs want to be as far away from each other as possible? Shouldn't the LP be axial and the shape be trigonal planar?
by Jamie Wang 3G
Thu Dec 03, 2020 4:03 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Outline 4 Shape and polar and IM forces
Replies: 1
Views: 9

Outline 4 Shape and polar and IM forces

In outline 4 it asks us to "Use shape and polar or non-polar properties, identify different intermolecular interactions/forces" does this just mean that shape and polar forces makes some intermolecular interactions possible? For example, dipole-dipole would be difficult to occur if electro...
by Jamie Wang 3G
Mon Nov 30, 2020 10:47 pm
Forum: Hybridization
Topic: Difference between hybrid orbitals and hybridization
Replies: 2
Views: 654

Re: Difference between hybrid orbitals and hybridization

Just to clarify, This means that AsF3 would have a hybridization of sp3 and is in the hybrid orbital of 4sp3?
by Jamie Wang 3G
Sat Nov 28, 2020 11:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E #13c
Replies: 2
Views: 5

2E #13c

The question asks for the Lewis Structure, VSEPR, shape, and bond angles of IO3-. I drew my structure with Iodine having one lone pair, connected to two double bonds to 2 Oxygens and a single bond to 1 Oxygen (a more stable structure). However, the back of the book shows all single bonds to oxygen (...
by Jamie Wang 3G
Thu Nov 26, 2020 5:12 am
Forum: Administrative Questions and Class Announcements
Topic: Chem 14B
Replies: 5
Views: 48

Re: Chem 14B

do you think he'll be able to record zoom classes if he isn't able to prerecord the videos? There weren't any other chem spots that wouldn't create an overlap in my schedule.
by Jamie Wang 3G
Thu Nov 26, 2020 5:10 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling Q18
Replies: 1
Views: 17

Re: Sapling Q18

I think it probably has something to do with the types of bonds since pi bonds don't allow rotation, while sigmas do
by Jamie Wang 3G
Mon Nov 23, 2020 7:21 pm
Forum: Student Social/Study Group
Topic: Exercising Our Minds and Bodies
Replies: 92
Views: 269

Re: Exercising Our Minds and Bodies

Lavelle has mentioned the importance of exercising our mind and body so I was interested to see what types of exercises everyone was up to! I usually just go for walks/runs with my dog. There are some really good exercise videos on youtube too! I usually do a full body one from Madfit or Pamela Reif.
by Jamie Wang 3G
Thu Nov 19, 2020 3:47 pm
Forum: Student Social/Study Group
Topic: Big Sad: Midterm 2
Replies: 82
Views: 512

Re: Big Sad: Midterm 2

I swear I somehow did worse on this one since math is a little easier for me than conceptual. I guess we'll see :(
by Jamie Wang 3G
Wed Nov 18, 2020 12:22 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability of Anions and Cations
Replies: 6
Views: 21

Re: Polarizability of Anions and Cations

The larger the anion is, the more easily it is polarized (polarizable). The smaller the cation is, the more polarizing power it has
by Jamie Wang 3G
Wed Nov 18, 2020 12:22 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability of Anions and Cations
Replies: 6
Views: 21

Re: Polarizability of Anions and Cations

The larger the anion is, the more easily it is polarized (polarizable). The smaller the cation is, the more polarizing power it has
by Jamie Wang 3G
Wed Nov 18, 2020 12:20 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: London Dipole
Replies: 3
Views: 23

Re: London Dipole

London Dipoles are found in all intermolecular bonds. It is the only IMF when the Electronegativity of the two atoms are similar (ex: ch4)
by Jamie Wang 3G
Sat Nov 14, 2020 11:27 pm
Forum: Trends in The Periodic Table
Topic: UA Riya Week 5 Question 4B
Replies: 2
Views: 19

UA Riya Week 5 Question 4B

Q: The first ionization enthalpy values (in kJ/mol) of group 13 elements are - B (801), Al (577), Ga (579), In (558), Ti (589). Explain the deviation in the general trend. For B --> Al, I understand that ionization energy decreases going down a period due to an increase in electron shielding and rad...
by Jamie Wang 3G
Fri Nov 13, 2020 9:32 pm
Forum: Dipole Moments
Topic: 3F.1c
Replies: 2
Views: 21

3F.1c

could someone explain to me why H2SeO4 has dipole dipole forces? What region is more negative if it is all balanced around the Se?
by Jamie Wang 3G
Thu Nov 12, 2020 4:04 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2A.9 Which M2+ are predicted to have following ground state e- configuration
Replies: 1
Views: 7

2A.9 Which M2+ are predicted to have following ground state e- configuration

For problem a) [Ar]3d7, I just looked at the table and saw that it is equivalent to Co, however I read somewhere else that we needed to add two electrons to it to see the true state. If I do that, it doesn't line up with the answer at the back of the book, can someone please tell me how to figure ou...
by Jamie Wang 3G
Wed Nov 11, 2020 5:23 am
Forum: Resonance Structures
Topic: Hybrid structures
Replies: 2
Views: 21

Re: Hybrid structures

I think it is true in nature because aren't resonance structures more stable than having single and double bonds. Since things aren't constantly exploding or having dramatic chemical reactions, I would assume it is because of that.
by Jamie Wang 3G
Wed Nov 11, 2020 5:21 am
Forum: Dipole Moments
Topic: Week 5/6 Sapling Question
Replies: 4
Views: 42

Re: Week 5/6 Sapling Question

Hydrogen bonds could form when the hydrogen in the compound is attached to N, O, or F. In the diagram, there are 2 Nitrogen atoms each with one lone pair, and 1 Oxygen atom with 2 pairs of lone electrons. Those four lone pairs can each form a hydrogen bond. In addition, for each of the Hydrogens tha...
by Jamie Wang 3G
Wed Nov 11, 2020 5:16 am
Forum: Formal Charge and Oxidation Numbers
Topic: Sampling week 5/6 Q5
Replies: 3
Views: 21

Re: Sampling week 5/6 Q5

For each, I plugged it into the formal charge equation FC = valence electron - ( (shared electrons in bonds/2 electrons per bond) - number of unpaired electrons) For example for carbon, there are 4 valence electrons (according to the periodic table), 4 electrons that are shared in bonds (2 with H, 2...
by Jamie Wang 3G
Wed Nov 11, 2020 4:49 am
Forum: Quantum Numbers and The H-Atom
Topic: HW question 2.17 [ENDORSED]
Replies: 7
Views: 932

Re: HW question 2.17 [ENDORSED]

Does just remembering the number of orbitals for s,p,d, and f always work for the number of orbitals, or should we always double-check with the ml -1,0,1 etc?
by Jamie Wang 3G
Thu Nov 05, 2020 12:37 am
Forum: Lewis Structures
Topic: Formal Charge and Lewis Strucutre
Replies: 7
Views: 54

Formal Charge and Lewis Strucutre

Hi! Is there a faster way to calculate the formal charge for our structures besides for what we did in class? I find myself taking a long time which is fine for now, but not sure how I'll be able to answer all the questions on the midterm.
by Jamie Wang 3G
Thu Nov 05, 2020 12:37 am
Forum: Lewis Structures
Topic: Formal Charge and Lewis Strucutre
Replies: 3
Views: 27

Formal Charge and Lewis Strucutre

Hi! Is there a faster way to calculate the formal charge for our structures besides for what we did in class? I find myself taking a long time which is fine for now, but not sure how I'll be able to answer all the questions on the midterm.
by Jamie Wang 3G
Thu Nov 05, 2020 12:35 am
Forum: Lewis Structures
Topic: Week5/6 Sapling Q4
Replies: 2
Views: 32

Re: Week5/6 Sapling Q4

I don't think you can switch the C and N easily because of electron affinity and ionization energy. However, if you are looking for another structure, take a look at the other oxygen. What I did was I made the double bond bond the C with the OTHER oxygen atom. Hope that helps!
by Jamie Wang 3G
Thu Nov 05, 2020 12:33 am
Forum: Lewis Structures
Topic: Lewis structures and charges
Replies: 3
Views: 34

Re: Lewis structures and charges

We also add and and subtract so we know the total number of electrons to put in our Lewis Structures. Later, I think it also helps to see how reactive an element is.
by Jamie Wang 3G
Thu Nov 05, 2020 12:32 am
Forum: Lewis Structures
Topic: double bonds in Lewis structures
Replies: 2
Views: 24

Re: double bonds in Lewis structures

I believe its because Cl only needs to share one electron to get a full octet since it already has 7 valence electrons. On the other hand, oxygen has 6 valence electrons, so it wants to share two electrons to gain a full octet, and to do so you would have to form a double bond with carbon. It makes...
by Jamie Wang 3G
Thu Nov 05, 2020 12:30 am
Forum: Lewis Structures
Topic: Chemical Formulas
Replies: 8
Views: 53

Re: Chemical Formulas

Does anyone have any memorization tricks for them? I find myself memorizing them for the semester/year and then completely forgetting about it later.
by Jamie Wang 3G
Mon Nov 02, 2020 2:01 pm
Forum: Student Social/Study Group
Topic: Midterm 2
Replies: 31
Views: 206

Re: Midterm 2

Really? I thought that the midterms would be cumulative and have questions from midterm 1.
by Jamie Wang 3G
Tue Oct 27, 2020 3:32 am
Forum: Administrative Questions and Class Announcements
Topic: Midterm topics and information
Replies: 8
Views: 88

Re: Midterm topics and information

The modules have lots of good conceptual practice!![/quote]


In Sapling and the Textbook?
by Jamie Wang 3G
Tue Oct 27, 2020 3:26 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: wavefunctions - midterm
Replies: 3
Views: 54

wavefunctions - midterm

are we responsible for understanding radial and angular wave functions? If yes, can someone clarify it?
by Jamie Wang 3G
Mon Oct 26, 2020 6:36 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm topics and information
Replies: 8
Views: 88

Re: Midterm topics and information

While studying the textbook, I would make sure to focus on the conceptual information related to what we've discussed in lecture in addition to solving the textbook problems. My guess is that the midterm will have conceptual questions in addition to the calculation-based questions. I'm kind of nerv...
by Jamie Wang 3G
Mon Oct 26, 2020 6:30 pm
Forum: *Shrodinger Equation
Topic: Particle in a Box
Replies: 5
Views: 83

Re: Particle in a Box

It is showing the difference between classical and quantum objects. A classical object has the same likelihood to be at any spot in the box while quantum objects are more likely to be found at certain places.
by Jamie Wang 3G
Mon Oct 26, 2020 6:26 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 196
Views: 891

Re: How are you studying?

Color coding!!!!! The best way to study for me personally is compiling a list of all of the topics on a test and color coding them to see what topics I need the most review on and what topics I only need a refresh on. For this class, I've copy and pasted all of the topics from Outline 1 and all but...
by Jamie Wang 3G
Mon Oct 26, 2020 6:24 pm
Forum: Properties of Light
Topic: Textbook Questions and Midterm
Replies: 6
Views: 58

Re: Textbook Questions and Midterm

Teti Omilana 2E wrote:Do we only focus on up to 1D on outline 2 or is all of outline 1 also included for the midterm?


All of outline 1 (fundamentals) is included according to my TA.
by Jamie Wang 3G
Wed Oct 21, 2020 10:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Exam
Replies: 7
Views: 71

Re: Exam

^^ Did he say graphing was fine in his office hours? I'm currently in a different country and its hard to find a scientific one here.
by Jamie Wang 3G
Wed Oct 21, 2020 1:27 am
Forum: Quantum Numbers and The H-Atom
Topic: Lymer and Balmer series
Replies: 5
Views: 48

Re: Lymer and Balmer series

How will you know if the number given by the series are the initial or final level? is it just based on the context of the question?
by Jamie Wang 3G
Wed Oct 21, 2020 12:51 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Sapling week 2-4 HW # 7
Replies: 1
Views: 21

Sapling week 2-4 HW # 7

In the question that asks for how many photons with a 857nm wavelength are needed to melt ice, I was able to get the correct answer using the enthalpy of fusion to calculate, but why should we use fusion and not the specific heat of a solid H2O?
by Jamie Wang 3G
Sun Oct 18, 2020 12:56 am
Forum: Significant Figures
Topic: Sig Figs and Constants on Exams
Replies: 9
Views: 80

Re: Sig Figs and Constants on Exams

In our practice problems during discussion sections, the correct answers are always rounded to the appropriate sig figs.
by Jamie Wang 3G
Fri Oct 16, 2020 3:14 am
Forum: Administrative Questions and Class Announcements
Topic: Built-in webcams/Equipment request [ENDORSED]
Replies: 22
Views: 710

Re: Built-in webcams/Equipment request [ENDORSED]

My TA said that as long as we join zoom on our phones, she'll be able to see us.
by Jamie Wang 3G
Thu Oct 15, 2020 3:36 pm
Forum: Administrative Questions and Class Announcements
Topic: Historical Figures in Science
Replies: 5
Views: 47

Historical Figures in Science

Does anyone know if we will need to memorize the historical figures in science besides for those who came up with crucial equations or discoveries?
by Jamie Wang 3G
Wed Oct 14, 2020 11:58 am
Forum: Administrative Questions and Class Announcements
Topic: Petition to Bring Music Back To Lectures [ENDORSED]
Replies: 34
Views: 529

Re: Petition to Bring Music Back To Lectures [ENDORSED]

Dr. DJ LL,
Thank you so much for bringing the music back! It's currently around 3am where I am at, and the music serves as a fantastic wake up call!
by Jamie Wang 3G
Wed Oct 14, 2020 2:22 am
Forum: Photoelectric Effect
Topic: Homework Problem #4
Replies: 4
Views: 43

Re: Homework Problem #4

Since we calculated the energy photons need to exert to remove each electron, and are given the total energy the group of electrons is giving off, all we need to do is divide (total energy of group) by (energy/photo). This will give the number of photons present. The number of photons needed is then...
by Jamie Wang 3G
Fri Oct 09, 2020 3:08 am
Forum: Properties of Light
Topic: Wave Properties
Replies: 5
Views: 73

Re: Wave Properties

If an object has a wave of exactly 10^-15 would we still be able to detect it or would it depend on individual sensitivity at that point?
by Jamie Wang 3G
Wed Oct 07, 2020 12:05 pm
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 78
Views: 49096

Re: How to find my posts

Is there a way to more easily navigate this community? The number of channels is helpful, but a little overwhelming sometimes.
by Jamie Wang 3G
Wed Oct 07, 2020 12:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 226
Views: 116324

Re: Advice from a Medical Student [ENDORSED]

Thank you so much for this! Coming into UCLA is a completely new ballgame and I wasn't sure where to start in terms of premed. This really helped sooth some of my worries!
by Jamie Wang 3G
Tue Oct 06, 2020 1:37 am
Forum: Empirical & Molecular Formulas
Topic: Sapling Homework 1 Q#9
Replies: 21
Views: 246

Re: Sapling Homework 1 Q#9

Here's what I did, if there is a quicker way, please let me know :) 1) calculate molar mass of each known compound 2) calculated the amount of grams for C and H elements (element mass/total mass of compound) 3) after knowing the weight of C and H elements, subtract them from 1.000 g (given) to find ...

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