Search found 41 matches

by IreneGi2I
Sun Oct 18, 2020 6:41 pm
Forum: Properties of Light
Topic: Study Advice
Replies: 19
Views: 59

Re: Study Advice

Personally, I watch Khan Academy videos after I watch lecture videos and there are something I found confusing. It helps me a lot to clarify some concepts. I think it's better to solve the textbook problems first. If the problems are challenging, then going to Step Up sessions will be very helpful. ...
by IreneGi2I
Sun Oct 18, 2020 6:33 pm
Forum: Properties of Light
Topic: Diatomic Molecules
Replies: 2
Views: 19

Re: Diatomic Molecules

In some cases, we need to know which element exists in diatomic structure in its natural state. I think H, O, and N are the ones which are especially important to know, and also useful in problem solving!
by IreneGi2I
Sun Oct 18, 2020 6:28 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr Frequency Condition
Replies: 2
Views: 18

Re: Bohr Frequency Condition

Hi, when you calculate Delta E, the Delta E (change in energy) = E (Final) - E (Initial). So, for example, let's assume we need to calculate the Delta E when an electron loses its energy and comes down to the second quantum level from the third level. The initial n=3, and the final n=2 (n represents...
by IreneGi2I
Sun Oct 18, 2020 6:15 pm
Forum: Empirical & Molecular Formulas
Topic: F3 Part A (Textbook)
Replies: 6
Views: 36

Re: F3 Part A (Textbook)

I think the compound formula will be given in the test!
by IreneGi2I
Sun Oct 18, 2020 6:11 pm
Forum: Balancing Chemical Reactions
Topic: L.35 Balancing Third Equation
Replies: 4
Views: 39

Re: L.35 Balancing Third Equation

Yes, there is an error in this question! You can find 'Solutions Manual Errors' on Chem14A website.
by IreneGi2I
Sun Oct 11, 2020 5:44 am
Forum: Empirical & Molecular Formulas
Topic: Ratios for empircal formulas
Replies: 6
Views: 36

Re: Ratios for empircal formulas

So, if you got the empirical formula, then you can calculate the molar mass of the compound. Then, to get the molecular formula from this empirical formula, you should divide the given molar mass of compound (which will be given in the question) by the molar mass of compound you calculated from empi...
by IreneGi2I
Sun Oct 11, 2020 5:21 am
Forum: Molarity, Solutions, Dilutions
Topic: Formulas involved in Determining Solution Concentration
Replies: 8
Views: 47

Re: Formulas involved in Determining Solution Concentration

So, basically, M (molarity) = n (moles of solute) / V (volume of solution). In the question that deals with dilution of solution, n (moles of solute) does not change even if we add more solution to the existing solution to dilute it. From this, we can derive the formula M(initial)*V(initial) = M(fin...
by IreneGi2I
Sun Oct 11, 2020 5:08 am
Forum: Molarity, Solutions, Dilutions
Topic: Sapling HW question
Replies: 4
Views: 85

Re: Sapling HW question

I also had problem with this one because I had no idea how to calculate the molar masses of 2-butanone and 3-methyl-3-hexanol. I actually looked them up on the internet, and according to TA, we would not have to know how to calculate these molar masses! I think those molar masses will be given in th...
by IreneGi2I
Sun Oct 11, 2020 5:04 am
Forum: Limiting Reactant Calculations
Topic: #10 Week 1 HW
Replies: 8
Views: 67

Re: #10 Week 1 HW

d represents density (g/ml). So, if there is 40ml of an element which has d of 0.5, then the mass of element would be 20g (multiply 40ml * 0.5g/ml)!
by IreneGi2I
Sun Oct 11, 2020 5:00 am
Forum: Limiting Reactant Calculations
Topic: Determining Limiting Reactant
Replies: 7
Views: 51

Re: Determining Limiting Reactant

Yes! As many people above explained, if the ratio of two are 1:1 (which is very rare), then there would be no limiting reagent.
by IreneGi2I
Sun Nov 10, 2019 8:35 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability for Final
Replies: 2
Views: 47

Polarizability for Final

Since final is cumulative, I was wondering if we have to know how to calculate polarizability for final. I think midterm did not really ask any questions about it, but just to make sure, do you all think we should study on this topic in depth for final?
by IreneGi2I
Sun Nov 10, 2019 8:33 pm
Forum: Administrative Questions and Class Announcements
Topic: What homework to turn in per week
Replies: 7
Views: 91

Re: What homework to turn in per week

I think you'll be fine to submit problems from Chemical Bonds for week 7 homework.
by IreneGi2I
Sun Nov 10, 2019 8:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 4
Views: 63

Re: Test 2

I guess materials that test 2 will cover might be affected by a cancelled class due to fire. Since test 2 is coming up, I believe Dr. Lavelle will notice us in this week.
by IreneGi2I
Sun Nov 10, 2019 8:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Second Discussion Test
Replies: 9
Views: 160

Re: Second Discussion Test

Yes, test 2 will start from week 8 during your discussion session like test 1. I think the materials it'll cover will depend on the pace of class. Since there was a cancelled class due to fire, I guess it will cover maybe a little less materials than previous quarters.
by IreneGi2I
Sun Nov 10, 2019 8:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Commuters
Replies: 3
Views: 61

Re: Commuters

I am a commuter, too. As a commuter who live far from the campus, I usually spend extra time between classes and review sessions to study or do assignments. Since libraries open until late night, I study there until the review sessions so that I can rest at home after the sessions. I can feel that i...
by IreneGi2I
Tue Oct 29, 2019 3:25 pm
Forum: Ionic & Covalent Bonds
Topic: Study For midterm
Replies: 7
Views: 93

Re: Study For midterm

Attending review sessions would help you along with solving practice problems. Dr. Lavelle mentioned that he will arrange many review sessions, so you would be able to attend the one that is convenient for you!
by IreneGi2I
Tue Oct 29, 2019 3:22 pm
Forum: Ionic & Covalent Bonds
Topic: 4f, 5f Electron Configurations
Replies: 2
Views: 28

4f, 5f Electron Configurations

Hi, I am a little bit confused about how to write 4f, 5f subshells in electron configurations, and what orders do I need to put. Like 3d comes before 4s, is the order f-d-s-p?
I would really appreciate if you can explain this with examples!
by IreneGi2I
Tue Oct 29, 2019 3:12 pm
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons?
Replies: 15
Views: 173

Re: Valence Electrons?

I found this chart on the Internet, and I think it will help you a lot!
by IreneGi2I
Tue Oct 29, 2019 3:09 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 10
Views: 172

Re: Midterm

I think Dr. Lavelle will give announcements about midterm at the lecture tomorrow. He will post information about midterm locations, too.
by IreneGi2I
Tue Oct 29, 2019 3:07 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 28
Views: 366

Re: Midterm

Yes, as someone said above, I think it will cover Fundamentals, Quantum world, and some concepts of Chemical Bonds. I recommend you to attend midterm review sessions as they will go over concepts that we need to know for midterm!
by IreneGi2I
Tue Oct 22, 2019 12:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Where to find what material you missed if you missed a class?
Replies: 4
Views: 45

Re: Where to find what material you missed if you missed a class?

Yes, I also recommend you to go UA sessions or workshops if you missed lectures. They generally cover materials from previous lectures, so they would help you catch up.
by IreneGi2I
Tue Oct 22, 2019 12:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 4 homework problems
Replies: 5
Views: 64

Re: Week 4 homework problems

So, for this week, are we not allowed to do questions in 1E section? (I thought that Dr. Lavelle explained about the electron configurations)
by IreneGi2I
Tue Oct 22, 2019 12:22 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals 1D.19
Replies: 3
Views: 81

Re: Orbitals 1D.19

First of all, s-subshell is l=0, p-subshell is l=1, d-subshell is l=2, f-subshell is l=3 For (a), it is 4p-subshell, so l= 1. If l=1, ml can be -1, 0, 1. Therefore, 4p-subshell can have 3 orbitals. For (b), it is 3d-subshell, so l=2. If l=2, ml can be -2, -1, 0, 1, 2. Therefore, 3d-subshell can have...
by IreneGi2I
Tue Oct 22, 2019 12:17 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Number
Replies: 4
Views: 69

Re: Quantum Number

There is no equation, but I found this chart very useful understanding & finding quantum numbers!
by IreneGi2I
Tue Oct 22, 2019 12:12 pm
Forum: Quantum Numbers and The H-Atom
Topic: G-subshell
Replies: 3
Views: 56

G-subshell

Regarding the 1D.25, I understand that g-subshell can exist. But what is the minimum n that can have g-subshell?
by IreneGi2I
Sun Oct 20, 2019 11:14 am
Forum: *Black Body Radiation
Topic: What do I really need to know?
Replies: 6
Views: 218

Re: What do I really need to know?

Black bodies are kind of an imaginary object that absorbs all types of wavelength. For now, I believe that we do not need to study about this in depth for tests.
by IreneGi2I
Sun Oct 20, 2019 11:11 am
Forum: Administrative Questions and Class Announcements
Topic: Chem Community Comment Points
Replies: 1
Views: 31

Chem Community Comment Points

Hi, I am wondering if there is any way for us to check our points for weekly Chemistry Community comments?
by IreneGi2I
Sun Oct 20, 2019 11:07 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Shell, Subshell, Orbital Terminology
Replies: 8
Views: 167

Re: Shell, Subshell, Orbital Terminology

I have a little confusion about shell (n). How do we determine what n is?
by IreneGi2I
Sun Oct 20, 2019 10:55 am
Forum: Administrative Questions and Class Announcements
Topic: UA Session and Step-Up Program
Replies: 4
Views: 44

UA Session and Step-Up Program

Hi, I haven't been to UA sessions or step-up sessions yet, but I have some questions about these sessions. Does UA session/Step-up session cover materials relevant to each week's classes? (Can I ask questions or get help to solve problems of previous weeks?) Also, can I just drop by the office to at...
by IreneGi2I
Sun Oct 20, 2019 10:50 am
Forum: Administrative Questions and Class Announcements
Topic: Modules
Replies: 3
Views: 39

Re: Modules

I asked a question about this because I thought the modules would be updated weekly. And I believe all modules have already been posted. These modules are relevant for week 0 and 1 to assist studying high school chemistry concepts.
by IreneGi2I
Sun Oct 13, 2019 4:31 pm
Forum: Properties of Light
Topic: SI units and wavelength
Replies: 6
Views: 47

Re: SI units and wavelength

As people mentioned above, I also think you should always check the units very carefully in tests (whether it is m or nm, or any other units)!
by IreneGi2I
Sun Oct 13, 2019 4:28 pm
Forum: Properties of Light
Topic: Photoelectric vs. Atomic spectra
Replies: 4
Views: 51

Photoelectric vs. Atomic spectra

HI, I am reviewing lecture notes, but I have a question about photoelectric effect and atomic spectroscopy. Professor Lavelle mentioned about the difference between photoelectric effect and atomic spectroscopy, but I could not find the answer on my notes. Can someone explain what is different betwee...
by IreneGi2I
Sun Oct 13, 2019 4:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Chapters Covered in Midterm?
Replies: 1
Views: 38

Chapters Covered in Midterm?

Hi, I am wondering what chapters will be covered in midterm. I am thinking about making a study plan ahead the midterm, but I am a little bit confused. Please let me know if you know about this!
by IreneGi2I
Sun Oct 13, 2019 4:14 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra help
Replies: 8
Views: 161

Re: Extra help

Personally, I use Chad's Prep for self-studying! It provides online lectures for free, and has been tons of help for me
by IreneGi2I
Sun Oct 13, 2019 4:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 3 HW Problem
Replies: 1
Views: 23

Re: Week 3 HW Problem

Yes, as far as I know, we are allowed to submit five questions from Quantum World only!
by IreneGi2I
Thu Oct 03, 2019 9:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Sapling Learning
Replies: 3
Views: 73

Re: Sapling Learning

I don't think Sapling Learning is required for the course. It is rather an additional practice program where you can get practice assignments, detailed solutions, etc.
by IreneGi2I
Thu Oct 03, 2019 9:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Audio-Visual Modules Update Date
Replies: 2
Views: 17

Re: Audio-Visual Modules Update Date

Thank you for the reply!
by IreneGi2I
Thu Oct 03, 2019 9:53 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro's Number?
Replies: 16
Views: 367

Re: Avogadro's Number?

Do you think we will have to memorize the Avogadro's Number for test? I am wondering if I will be given the Avogadro's Number when I get the questions that ask for atoms' number.
by IreneGi2I
Thu Oct 03, 2019 9:50 pm
Forum: Significant Figures
Topic: Practical Application of Sig Figs?
Replies: 3
Views: 53

Practical Application of Sig Figs?

Hi, I am wondering how sig fig rules are applied to problems. I know the rules of Sig Figs, but I am not so sure about how they are used in practical sense. If you can give me an example, I would greatly appreciate it! Also, will I have to study heavily on this concept for the test?
by IreneGi2I
Thu Oct 03, 2019 9:43 pm
Forum: SI Units, Unit Conversions
Topic: Book Access Issues
Replies: 3
Views: 96

Re: Book Access Issues

Hi, I am having the same issue. I want to get refund from UCLA and purchase it directly from Macmicllan learning. Is it possible to get refund for online e-textbook? I contacted UCLA store and they kept responding that the order is still processing. If someone knows about it, please let me know!
by IreneGi2I
Thu Oct 03, 2019 9:38 pm
Forum: Administrative Questions and Class Announcements
Topic: Audio-Visual Modules Update Date
Replies: 2
Views: 17

Audio-Visual Modules Update Date

Hi, does anyone know when are weekly audio-visual modules updated on Chem14A website? I checked the all the modules for week 2 have updated, but I am not sure when the other modules will be posted. Does Dr. Lavelle usually post them on Sunday of every week?

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