Search found 100 matches

by Donna Nguyen 2L
Mon Mar 09, 2020 2:06 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 7E.1
Replies: 1
Views: 19

7E.1

How does a catalyst affect (a) the rate of the reverse reaction; (b) the value of ΔH° for the reaction?

I know how to answer part A, but I'm unsure how to answer part B. What does a catalyst contribute to the value of ΔH°?
by Donna Nguyen 2L
Mon Mar 09, 2020 1:55 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5.61
Replies: 2
Views: 88

Re: 5.61

It would be included!
by Donna Nguyen 2L
Mon Mar 09, 2020 1:49 am
Forum: Administrative Questions and Class Announcements
Topic: 100 or 50 posts?
Replies: 8
Views: 99

Re: 100 or 50 posts?

I'm sure having 100 posts is fine :)
by Donna Nguyen 2L
Mon Mar 09, 2020 1:48 am
Forum: Student Social/Study Group
Topic: Final Exam Review
Replies: 4
Views: 121

Re: Final Exam Review

Yes, on Dr. Lavelle's website, he has a link called "Final Exam: Review Sessions and Exam Venues," and it seems that the review session will be this Friday.
by Donna Nguyen 2L
Mon Mar 09, 2020 12:16 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 7D.5
Replies: 1
Views: 18

7D.5

The rate constant of the reaction between CO2 and OH− in aqueous solution to give the HCO3− ion is 1.5*10^10 L*mol^-1*s^-1 at 25°C. Determine the rate constant at human body temperature (37°C), given that the activation energy for the reaction is 38 kJ*mol^-1. I'm confused about the solution in the ...
by Donna Nguyen 2L
Tue Mar 03, 2020 1:16 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: water in the equilibrium constant
Replies: 2
Views: 40

Re: water in the equilibrium constant

To add on, water would be included in the gas phase but not as a solid or liquid since solids and liquids aren't included when calculating equilibrium constants since the molar concentration wouldn't change.
by Donna Nguyen 2L
Tue Mar 03, 2020 1:06 am
Forum: General Science Questions
Topic: Test 2
Replies: 12
Views: 286

Re: Test 2

I assume what everyone else is saying, about 7-10 questions.
by Donna Nguyen 2L
Tue Mar 03, 2020 1:05 am
Forum: General Science Questions
Topic: Test 2
Replies: 16
Views: 314

Re: Test 2

It will cover the second page of outline 4 and all of outline 5.
by Donna Nguyen 2L
Tue Mar 03, 2020 1:02 am
Forum: Administrative Questions and Class Announcements
Topic: what to know for test 2
Replies: 10
Views: 110

Re: what to know for test 2

It covers things on the second page of outline 4, and all of outline 5.
by Donna Nguyen 2L
Tue Mar 03, 2020 12:59 am
Forum: Administrative Questions and Class Announcements
Topic: Sections for Homework
Replies: 3
Views: 82

Re: Sections for Homework

I feel like either is fine, but I think I would do electrochemistry since our test is this week!
by Donna Nguyen 2L
Tue Feb 25, 2020 11:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 15
Views: 217

Re: Test 2

Essentially, it covers material that we learned post-midterm up until Monday's lecture, which is the second page of outline 4 and all of outline 5.
by Donna Nguyen 2L
Tue Feb 25, 2020 11:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra Credit
Replies: 17
Views: 227

Re: Extra Credit

I don't think there are any extra credit opportunities unfortunately but it would be super helpful.
by Donna Nguyen 2L
Tue Feb 25, 2020 11:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Hw 8
Replies: 10
Views: 122

Re: Hw 8

I'd suggest something on electrochemistry since we just finished learning it and since it is covered on test 2.
by Donna Nguyen 2L
Tue Feb 25, 2020 11:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2 info
Replies: 8
Views: 135

Re: Test 2 info

Dr. Lavelle's website says that test 2 will cover the second page of Outline 4: Thermodynamics and Outline 5: Electrochemistry and its Applications.
by Donna Nguyen 2L
Tue Feb 25, 2020 11:46 pm
Forum: General Science Questions
Topic: Organic Chemistry Tutor?
Replies: 6
Views: 125

Re: Organic Chemistry Tutor?

I think the Organic Chemistry tutor definitely helps me understand some concepts better, but like someone else commented, he probably doesn't cover everything we learn in lecture.
by Donna Nguyen 2L
Mon Feb 17, 2020 3:06 am
Forum: General Science Questions
Topic: Midterm Graded
Replies: 2
Views: 53

Re: Midterm Graded

I think you can also pick up your midterm during your discussion section if you aren't able to pick it up after class on Wednesday.
by Donna Nguyen 2L
Mon Feb 17, 2020 2:56 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: sign of delta G
Replies: 9
Views: 131

sign of delta G

How does delta G tell us which way a reaction will shift?
by Donna Nguyen 2L
Mon Feb 17, 2020 2:49 am
Forum: Student Social/Study Group
Topic: Preparing for Exam Content
Replies: 7
Views: 167

Re: Preparing for Exam Content

I definitely feel the same way. I felt like I studied super hard for the midterm and I thought that I was (kind of) ready, but it was more difficult than I hoped and expected. I feel like the best way to better prepare for these types of questions is to continue doing practice problems and understan...
by Donna Nguyen 2L
Mon Feb 17, 2020 2:44 am
Forum: General Science Questions
Topic: Content on Test 2
Replies: 10
Views: 120

Re: Content on Test 2

I believe it will be material learned post-midterm up until the week of the test or so because I remember Dr. Lavelle doing something similar last quarter for 14A. But I agree, check with your TA to be sure!
by Donna Nguyen 2L
Mon Feb 17, 2020 2:41 am
Forum: General Science Questions
Topic: homework for week 7
Replies: 7
Views: 72

Re: homework for week 7

Since Dr. Lavelle covered the rest of thermodynamics (focus 5G.3 5G.4, and 5J.3) and the beginning of electrochemistry on Friday, I think we can still turn in work on these topics since they are recently covered material.
by Donna Nguyen 2L
Tue Feb 11, 2020 1:13 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: ∆G, ∆H, ∆S
Replies: 6
Views: 117

∆G, ∆H, ∆S

What's the relationship between ∆G, ∆H, and ∆S? I know that the Gibbs Free Energy equation is ∆G = ∆H - T∆S, but I'm not sure how exactly it all fits together.
by Donna Nguyen 2L
Tue Feb 11, 2020 1:09 am
Forum: Ideal Gases
Topic: R Constant
Replies: 18
Views: 249

Re: R Constant

In many of our examples and homework problems, the R constant is 8.314 J/mol·K, but if you look at Dr. Lavelle's constants and equations sheet, R is the gas constant and actually has different values. The R value you use depends on the units that are given in the problem.
by Donna Nguyen 2L
Tue Feb 11, 2020 1:00 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Questions about Equation Sheet
Replies: 3
Views: 50

Re: Questions about Equation Sheet

I believe that Cp = (5/2) R applies to diatomic and polyatomic gases, while Cv = (3/2) R applies to monoatomic gases.
by Donna Nguyen 2L
Tue Feb 11, 2020 12:55 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneity
Replies: 3
Views: 40

Spontaneity

How does Gibbs Free Energy relate to spontaneity?
by Donna Nguyen 2L
Tue Feb 11, 2020 12:46 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: R constants
Replies: 21
Views: 728

Re: R constants

It generally depends on what units are given to you in the problem, then you base which R to use off of that.
by Donna Nguyen 2L
Mon Feb 03, 2020 3:03 am
Forum: Student Social/Study Group
Topic: Midterm and Final Question
Replies: 18
Views: 259

Re: Midterm and Final Question

Like everyone else is saying, the UAs put together a review sheet/study guide but Dr. Lavelle himself doesn't give any out.
by Donna Nguyen 2L
Mon Feb 03, 2020 2:56 am
Forum: Administrative Questions and Class Announcements
Topic: TeST 1
Replies: 3
Views: 45

Re: TeST 1

I also got my test back in my discussion section.
by Donna Nguyen 2L
Mon Feb 03, 2020 2:56 am
Forum: Administrative Questions and Class Announcements
Topic: slides
Replies: 8
Views: 93

Re: slides

He unfortunately doesn't post slides.
by Donna Nguyen 2L
Mon Feb 03, 2020 2:55 am
Forum: Administrative Questions and Class Announcements
Topic: Midterm dates
Replies: 11
Views: 111

Re: Midterm dates

It's cumulative so it will cover the topics from Test 1 + Thermochemistry and Thermodynamics.
by Donna Nguyen 2L
Mon Feb 03, 2020 2:53 am
Forum: Student Social/Study Group
Topic: Test 1 Solution
Replies: 6
Views: 121

Re: Test 1 Solution

My TA told me that the answer key won't be posted, but if you need help with a specific question, I'm sure your TA can help you with it.
by Donna Nguyen 2L
Mon Jan 27, 2020 2:38 am
Forum: Administrative Questions and Class Announcements
Topic: 14A final solutions
Replies: 6
Views: 80

Re: 14A final solutions

I was also looking for the solutions, but I don't think they're posted anywhere.
by Donna Nguyen 2L
Mon Jan 27, 2020 2:36 am
Forum: Administrative Questions and Class Announcements
Topic: homework for week 4
Replies: 11
Views: 126

Re: homework for week 4

Yes, I think homework is on outline 3 (thermochemistry).
by Donna Nguyen 2L
Mon Jan 27, 2020 2:34 am
Forum: Administrative Questions and Class Announcements
Topic: Grading of Tests
Replies: 18
Views: 230

Re: Grading of Tests

Yes, partial credit is given so it's important to always show all of your work even if your final answer turns out to be incorrect.
by Donna Nguyen 2L
Mon Jan 27, 2020 2:33 am
Forum: Administrative Questions and Class Announcements
Topic: Practice Test
Replies: 2
Views: 36

Re: Practice Test

Dr. Lavelle himself doesn't give out practice tests but there are some on Chemistry Community that were posted by UAs.
by Donna Nguyen 2L
Mon Jan 27, 2020 2:31 am
Forum: General Science Questions
Topic: Fall 2019 final
Replies: 7
Views: 95

Re: Fall 2019 final

Ellen Amico 2L wrote:We have to pick them up ourselves in Young Hall 3034 between 9-5pm.

Also, I think they're closed from 12PM-1PM (no one was there at the time when I tried picking it up at 12:30).
by Donna Nguyen 2L
Mon Jan 20, 2020 12:42 am
Forum: Administrative Questions and Class Announcements
Topic: test 1/homework
Replies: 4
Views: 84

Re: test 1/homework

Yes, I believe homework is still due.
by Donna Nguyen 2L
Mon Jan 20, 2020 12:39 am
Forum: Administrative Questions and Class Announcements
Topic: TeST 1
Replies: 5
Views: 62

Re: TeST 1

Test 1 covers Equilibrium and Acid & Base Equilibria, so topics such as Le Chatelier's Principle, Q/K, calculating pH/pOH, etc.
by Donna Nguyen 2L
Mon Jan 20, 2020 12:37 am
Forum: Administrative Questions and Class Announcements
Topic: Midterm and final
Replies: 6
Views: 82

Re: Midterm and final

The midterm and final are cumulative and the tests cover certain outlines, as shown on Dr. Lavelle's class website.
by Donna Nguyen 2L
Mon Jan 20, 2020 12:35 am
Forum: General Science Questions
Topic: Test 1 [ENDORSED]
Replies: 13
Views: 180

Re: Test 1 [ENDORSED]

It begins this week (week 3) in your discussion section and covers Equilibrium and Acid & Base Equilibria.
by Donna Nguyen 2L
Mon Jan 20, 2020 12:33 am
Forum: General Science Questions
Topic: test 1
Replies: 8
Views: 90

Re: test 1

The test is during your discussion section and covers Equilibrium and Acid & Base Equilibria.
by Donna Nguyen 2L
Tue Jan 14, 2020 11:55 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6A.19
Replies: 6
Views: 82

Re: 6A.19

I was having the same problem! It's probably just a mistake in the solutions manual.
by Donna Nguyen 2L
Tue Jan 14, 2020 11:52 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K units
Replies: 10
Views: 108

K units

Why are units omitted when calculating K?
by Donna Nguyen 2L
Tue Jan 14, 2020 11:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Hw for next week
Replies: 19
Views: 192

Re: Hw for next week

I'm sure it's fine since it's still recently covered material!
by Donna Nguyen 2L
Tue Jan 14, 2020 11:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework 5I.25
Replies: 4
Views: 53

Re: Homework 5I.25

You use 0.0189 instead of 0.0424 since this value is larger than the concentration of NO2.
by Donna Nguyen 2L
Tue Jan 14, 2020 11:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE charts on tests/exams
Replies: 8
Views: 70

Re: ICE charts on tests/exams

I think we should include the ICE charts since Dr. Lavelle did an example with it in class, and it may also be a way to receive partial points.
by Donna Nguyen 2L
Thu Jan 09, 2020 12:51 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q vs K
Replies: 8
Views: 76

Q vs K

What's the difference between Q and K? Or, how are they similar?
by Donna Nguyen 2L
Thu Jan 09, 2020 12:46 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K being small or large
Replies: 4
Views: 34

K being small or large

What happens if K is small and what happens if K is large?
by Donna Nguyen 2L
Thu Jan 09, 2020 12:43 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K for Gases
Replies: 12
Views: 96

Re: K for Gases

Can someone explain 5H.1? 5H.1 is similar to the example shown on page 410 of the textbook, so you can follow that when trying to do this homework problem. In fact, part (a) is almost the same as the example. With the reverse reaction, the equilibrium constant is the reciprocal of the original chem...
by Donna Nguyen 2L
Thu Jan 09, 2020 12:37 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K expression
Replies: 6
Views: 63

K expression

Why are solids and liquids not included in the K expression?
by Donna Nguyen 2L
Tue Jan 07, 2020 4:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc vs K
Replies: 6
Views: 78

Kc vs K

Is there a difference between Kc and K? I couldn't figure out if there was a difference or not in the textbook.
by Donna Nguyen 2L
Mon Dec 02, 2019 2:28 am
Forum: Student Social/Study Group
Topic: Final topics
Replies: 10
Views: 116

Re: Final topics

The final is cumulative so it will cover material we learned since week 1.
by Donna Nguyen 2L
Mon Dec 02, 2019 2:24 am
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Posts
Replies: 10
Views: 177

Re: Chemistry Community Posts

I think it depends on your TA. For me, my points aren't posted yet.
by Donna Nguyen 2L
Mon Dec 02, 2019 2:22 am
Forum: Administrative Questions and Class Announcements
Topic: Test 2 Grades
Replies: 10
Views: 168

Re: Test 2 Grades

The grades are posted on myUCLA!
by Donna Nguyen 2L
Mon Dec 02, 2019 2:19 am
Forum: Administrative Questions and Class Announcements
Topic: Calculators on Final
Replies: 6
Views: 87

Re: Calculators on Final

I assume calculators will be allowed.
by Donna Nguyen 2L
Mon Dec 02, 2019 2:17 am
Forum: Administrative Questions and Class Announcements
Topic: Curving in Chem 14A
Replies: 7
Views: 238

Re: Curving in Chem 14A

His syllabus says the class doesn't use a curve, but I've heard that it depends on the grades distribution at the end of the quarter.
by Donna Nguyen 2L
Mon Nov 25, 2019 1:12 pm
Forum: Student Social/Study Group
Topic: Test 2 and Final
Replies: 18
Views: 226

Re: Test 2 and Final

The final is cumulative, so it covers all material from week 1 to week 10.
by Donna Nguyen 2L
Mon Nov 25, 2019 1:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Material for the final exam
Replies: 4
Views: 62

Re: Material for the final exam

I don't know if we're going to have a review lecture like for the midterm, but I don't think that we will learn on the last day of lecture, considering our final is two days after that day.
by Donna Nguyen 2L
Mon Nov 25, 2019 1:06 am
Forum: Student Social/Study Group
Topic: Any tips on how to catch up in this class?
Replies: 16
Views: 260

Re: Any tips on how to catch up in this class?

I totally get you, but I hear that the step up sessions are really helpful!
by Donna Nguyen 2L
Mon Nov 25, 2019 12:27 am
Forum: Hybridization
Topic: Sigma and Pi Bonds
Replies: 5
Views: 50

Sigma and Pi Bonds

What's the difference between a sigma bond and a pi bond?
by Donna Nguyen 2L
Mon Nov 25, 2019 12:20 am
Forum: Administrative Questions and Class Announcements
Topic: Week 9 Homework
Replies: 2
Views: 61

Week 9 Homework

What is week 9 homework on?
by Donna Nguyen 2L
Mon Nov 18, 2019 6:04 pm
Forum: Administrative Questions and Class Announcements
Topic: test 2
Replies: 2
Views: 53

Re: test 2

I think I remember my TA saying that test 2 will be the same length as test 1.
by Donna Nguyen 2L
Mon Nov 18, 2019 6:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2 Length
Replies: 9
Views: 104

Re: Test 2 Length

I think I remember my TA saying that it's going to have 7 or 8 questions like test 1.
by Donna Nguyen 2L
Mon Nov 18, 2019 2:02 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Notation
Replies: 7
Views: 95

Re: VSEPR Notation

Since there's no lone pairs, I don't think it's necessary to include the E.
by Donna Nguyen 2L
Mon Nov 18, 2019 1:56 am
Forum: Determining Molecular Shape (VSEPR)
Topic: AXE notation
Replies: 10
Views: 114

AXE notation

What is the AXE notation? What does each letter represent?
by Donna Nguyen 2L
Mon Nov 18, 2019 1:54 am
Forum: General Science Questions
Topic: Chem BL
Replies: 7
Views: 143

Re: Chem BL

I've heard the same, and I've also heard that 14BL takes up a lot of time and it's really hard to manage while taking 14B simultaneously, apparently.
by Donna Nguyen 2L
Tue Nov 12, 2019 5:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 4
Views: 63

Re: Test 2

I don't think Dr. Lavelle has announced what will be on test 2 yet, but I'm going to guess that it will be on the sections Chemical Bonds and Molecular Shape and Structure.
by Donna Nguyen 2L
Tue Nov 12, 2019 5:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Video Modules
Replies: 5
Views: 82

Re: Video Modules

I feel like he won't post more only because the last videos were from the early quantum unit, but I agree that it would be super helpful if he did.
by Donna Nguyen 2L
Tue Nov 12, 2019 5:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Studying
Replies: 14
Views: 273

Re: Final Studying

I'm going to do more practice problems. I hear that the step-up sessions are really helpful, so I might start going to those as well.
by Donna Nguyen 2L
Tue Nov 12, 2019 5:18 pm
Forum: Octet Exceptions
Topic: Octet Exceptions
Replies: 2
Views: 134

Octet Exceptions

Why are the elements H, He, Li, and Be exceptions to the octet rule?
by Donna Nguyen 2L
Tue Nov 12, 2019 5:08 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 7
Views: 185

Formal Charge

How do you calculate formal charge? What's the equation and what does everything stand for?
by Donna Nguyen 2L
Tue Nov 05, 2019 4:33 pm
Forum: Properties of Light
Topic: Value for C
Replies: 8
Views: 99

Re: Value for C

I think either is fine to use, but I would recommend using the one on the constants and equations sheet just in case.
by Donna Nguyen 2L
Tue Nov 05, 2019 4:29 pm
Forum: Properties of Light
Topic: Midterm formulas
Replies: 6
Views: 152

Re: Midterm formulas

Yes, I believe that we will be given the formula sheet and the periodic table.
by Donna Nguyen 2L
Tue Nov 05, 2019 4:24 pm
Forum: Properties of Light
Topic: Hz vs. frequency
Replies: 7
Views: 235

Re: Hz vs. frequency

Hertz is the unit for frequency. Hertz is also the same as (s^-1), so both units are interchangeable for frequency.
by Donna Nguyen 2L
Tue Nov 05, 2019 4:22 pm
Forum: Properties of Light
Topic: Wavelength and Type of Light
Replies: 3
Views: 106

Re: Wavelength and Type of Light

I would assume that we won't need to know it for all types except for visible light.
by Donna Nguyen 2L
Tue Nov 05, 2019 4:13 pm
Forum: SI Units, Unit Conversions
Topic: Memorizing Conversions
Replies: 25
Views: 543

Re: Memorizing Conversions

Like everyone said, the conversion sheet will be given, but there may be some conversions that aren't on there that may be helpful to memorize anyways.
by Donna Nguyen 2L
Wed Oct 30, 2019 11:54 pm
Forum: Ionic & Covalent Bonds
Topic: Week 5 HW
Replies: 4
Views: 78

Re: Week 5 HW

Homework for week 5 should be on chemical bonds since we recently learned this.
by Donna Nguyen 2L
Wed Oct 30, 2019 11:48 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Bonds
Replies: 6
Views: 61

Ionic and Covalent Bonds

What's the difference between ionic and covalent bonds? Which one is stronger?
by Donna Nguyen 2L
Wed Oct 30, 2019 11:18 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 10
Views: 183

Re: Midterm

Dr. Lavelle posted all of the information about the midterm on his website so check that out if you haven't yet.
by Donna Nguyen 2L
Wed Oct 30, 2019 11:15 pm
Forum: Ionic & Covalent Bonds
Topic: Homework for Week 5
Replies: 8
Views: 82

Re: Homework for Week 5

I think homework for week 5 should be on chemical bonds since it was the most recently discussed material in lecture.
by Donna Nguyen 2L
Tue Oct 29, 2019 8:31 pm
Forum: Administrative Questions and Class Announcements
Topic: posting on chemistry community
Replies: 11
Views: 205

Re: posting on chemistry community

It is due Sunday night at 11:59PM. My TA said that even if you post at 12, the computer will count it towards next week.
by Donna Nguyen 2L
Wed Oct 23, 2019 1:42 am
Forum: Einstein Equation
Topic: unit of energy
Replies: 7
Views: 581

Re: unit of energy

keV is the abbreviation for kiloelectron volts, a unit of energy. This is equal to 1000 eV (electron volts). 1 eV is equal to 1.602*10^-19 J, which is also a constant we have seen before for energy.
by Donna Nguyen 2L
Wed Oct 23, 2019 1:38 am
Forum: Properties of Electrons
Topic: Mass of an Electron
Replies: 14
Views: 231

Re: Mass of an Electron

This is the set mass of the electron so it doesn't change.
by Donna Nguyen 2L
Wed Oct 23, 2019 1:30 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D.23
Replies: 2
Views: 64

1D.23

How many orbitals can have the following quantum numbers in an atom: (a) n=2, l=1; (b) n=4, l =2, ml=-2; (c) n=2; (d) n=3, l=2, ml=+1?

How would I approach this problem?
by Donna Nguyen 2L
Wed Oct 23, 2019 1:25 am
Forum: Properties of Light
Topic: Constant for Speed of Light
Replies: 14
Views: 208

Re: Constant for Speed of Light

Both are correct. 2.998*10^8 m/s is more accurate, but I'm sure you can use 3.0*10^8 m/s as well, as it also gives an accurate answer.
by Donna Nguyen 2L
Wed Oct 23, 2019 1:20 am
Forum: Ionic & Covalent Bonds
Topic: Week 4 Homework
Replies: 9
Views: 147

Re: Week 4 Homework

I think homework for this week is based on the quantum world since we're still on it.
by Donna Nguyen 2L
Fri Oct 18, 2019 9:33 pm
Forum: Properties of Light
Topic: Constants/equations
Replies: 2
Views: 72

Re: Constants/equations

Most of the time, these constants and equations will be provided (correct me if I'm wrong), but I believe it'll be helpful to remember Planck's Constant, the speed of light, and the formula E=hv.
by Donna Nguyen 2L
Fri Oct 18, 2019 9:11 pm
Forum: Properties of Electrons
Topic: Using masses of protons, neutrons, and electrons
Replies: 7
Views: 137

Re: Using masses of protons, neutrons, and electrons

We probably don't need to memorize the masses. If anything, I think we would need to know the mass of an electron since it seems to be the most commonly used, but I don't think we'll need to memorize it.
by Donna Nguyen 2L
Fri Oct 18, 2019 9:06 pm
Forum: Properties of Electrons
Topic: Momentum
Replies: 11
Views: 92

Re: Momentum

The formula for momentum is p(momentum) = mass * velocity. Momentum is the quantity of motion that an object has, and it takes into account mass and velocity, while velocity is the rate of change of the position of an object.
by Donna Nguyen 2L
Fri Oct 18, 2019 9:03 pm
Forum: Properties of Electrons
Topic: Equations for Test
Replies: 9
Views: 133

Re: Equations for Test

Like someone said above, the equations should be given, but it's still helpful to have them memorized.
by Donna Nguyen 2L
Fri Oct 18, 2019 8:58 pm
Forum: Properties of Light
Topic: Unit for Wavelength
Replies: 34
Views: 386

Re: Unit for Wavelength

The unit for wavelength is meters. Although, it can be seen in nanometers, kilometers, picometers, etc.
by Donna Nguyen 2L
Wed Oct 09, 2019 1:53 am
Forum: SI Units, Unit Conversions
Topic: Homework
Replies: 9
Views: 210

Re: Homework

I think we can do our homework in either pen or pencil, but pen will probably make it easier to read and therefore easier to grade.
by Donna Nguyen 2L
Wed Oct 09, 2019 1:48 am
Forum: SI Units, Unit Conversions
Topic: Test 1
Replies: 5
Views: 168

Re: Test 1

Adding on, the test covers all the fundamentals and reflects the homework that we have been doing (review of chemical & physical principles).
by Donna Nguyen 2L
Wed Oct 09, 2019 1:34 am
Forum: SI Units, Unit Conversions
Topic: Showing work/ rearranging equations
Replies: 8
Views: 241

Re: Showing work/ rearranging equations

I don't think you will need to rearrange the question. Dr. Lavelle probably does it for easier viewing and to let us see how he got to that point.
by Donna Nguyen 2L
Wed Oct 09, 2019 1:32 am
Forum: SI Units, Unit Conversions
Topic: test and question e1
Replies: 3
Views: 120

Re: test and question e1

I believe that it is correct to leave your answer in pm, but convert if the question asks you to convert.
by Donna Nguyen 2L
Wed Oct 09, 2019 1:29 am
Forum: SI Units, Unit Conversions
Topic: Knowing the atomic mass for test #1
Replies: 4
Views: 81

Re: Knowing the atomic mass for test #1

I remember my TA saying it will be provided on the test so we won't have to memorize it.
by Donna Nguyen 2L
Thu Oct 03, 2019 10:20 pm
Forum: Significant Figures
Topic: Next Week's Test 1
Replies: 9
Views: 199

Re: Next Week's Test 1

I don't remember what my TA said, but I suggest knowing sig figs anyways because it'll probably be needed in future exams.
by Donna Nguyen 2L
Thu Oct 03, 2019 10:12 pm
Forum: SI Units, Unit Conversions
Topic: Diagnostic test for chem 17 vs 14A
Replies: 5
Views: 107

Re: Diagnostic test for chem 17 vs 14A

I remember the site taking me to some page that told me whether I was ready for Chem 14A or not. Don't worry, I'm also rusty on high school chem, especially since it has been 3 years since taking it. We're all on the same page!
by Donna Nguyen 2L
Thu Oct 03, 2019 10:07 pm
Forum: SI Units, Unit Conversions
Topic: Homework 2
Replies: 7
Views: 107

Re: Homework 2

For homework 2, I think we can choose from the fundamentals section, but assuming that Dr. Lavelle will teach the quantum world, we should choose homework problems from that section.
by Donna Nguyen 2L
Thu Oct 03, 2019 9:57 pm
Forum: SI Units, Unit Conversions
Topic: Question about Showing Work
Replies: 22
Views: 386

Re: Question about Showing Work

I think you should try to show as much work as possible because whoever is grading might want to see the steps in how you approach the problem and get the answer.
by Donna Nguyen 2L
Thu Oct 03, 2019 9:53 pm
Forum: SI Units, Unit Conversions
Topic: How to format homework
Replies: 9
Views: 149

Re: How to format homework

I put my name, discussion section, and UID in the top right corner of the page and clearly wrote out the problem number and boxed my answers. Hopefully that's all we need to put.

Go to advanced search