Search found 45 matches

by Jamie2002
Sun Nov 22, 2020 9:28 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: Hydrogen Bond
Replies: 5
Views: 31

Re: Hydrogen Bond

The hydrogen in one molecule is partially positive, and would form a hydrogen bond with an oxygen in another molecule, which is partially negative.
by Jamie2002
Sun Nov 22, 2020 9:27 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: H-bonding
Replies: 4
Views: 24

Re: H-bonding

I think you're right, but it has 3 hydrogen bonds when pairing with cytosine.
by Jamie2002
Tue Nov 17, 2020 10:11 am
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Boiling and Melting point
Replies: 13
Views: 44

Boiling and Melting point

Are boiling point and melting point directly related? Do molecules with higher melting points have stronger intermolecular forces?
by Jamie2002
Mon Nov 16, 2020 11:43 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: electron spin
Replies: 4
Views: 24

electron spin

When a question asks for the electron spin, do we always say that it can either be +½ or -½? Or if we know that the electron in question is an unpaired electron, we can say that it has an electron spin of +½?
by Jamie2002
Mon Nov 16, 2020 5:14 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework 1D #5
Replies: 2
Views: 16

Re: Homework 1D #5

Jagveer 2L wrote:We are not expected to know that. The questions on the midterm are going to be modeled after the problems given in the syllabus and 1D#5 was not on the syllabus, so I do not think that we will be quizzed on it.



Okay, thank you!
by Jamie2002
Mon Nov 16, 2020 4:10 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework 1D #5
Replies: 2
Views: 16

Homework 1D #5

Question:
Show that the electron distribution is spherically symetrical for an atom in which an electron occupies each of the three p-orbitals of a given shell.

The solution to this involves lots of equations with sin and cos. Are we expected to know how to do this for the midterm?
by Jamie2002
Sun Nov 15, 2020 9:44 pm
Forum: Electronegativity
Topic: General Idea of Electronegativity [ENDORSED]
Replies: 3
Views: 31

Re: General Idea of Electronegativity [ENDORSED]

You should know that electronegativity increases going from left to right across a period and decreases going down a group.
by Jamie2002
Sun Nov 15, 2020 9:42 pm
Forum: Electronegativity
Topic: Tips on remembering trend
Replies: 5
Views: 27

Re: Tips on remembering trend

I would draw out perodic tables and draw arrows describing each trend (i.e. for electronegativity, draw an arrow starting in the bottom left hand corner and going to the top right corner, where electronegativity is the highest). This is the most straightforward way to represent each trend.
by Jamie2002
Sun Nov 15, 2020 9:38 pm
Forum: Dipole Moments
Topic: Dipole moment
Replies: 2
Views: 14

Re: Dipole moment

Dipole moments occur when there is a difference in electronegativity between two atoms. The larger the difference in electronegativity, the larger the dipole moment. Electrons are more drawn to the more electronegative atom, distorting the electron cloud around the molecule. Dipole moments occur whe...
by Jamie2002
Sun Nov 15, 2020 9:34 pm
Forum: Dipole Moments
Topic: Hydrogen Bonding Lone pairs
Replies: 3
Views: 14

Re: Hydrogen Bonding Lone pairs

A hydrogen bond is a bond between an partially positive hydrogen atom of one molecule and a partially negative N, O, or F atom of a neighboring molecule. The lone pair in that N, O, or F atom is what interacts in the hydrogen bond. It is what gets drawn to the partially positive H atom.
by Jamie2002
Sun Nov 15, 2020 9:31 pm
Forum: Bond Lengths & Energies
Topic: Electron Relationship in Bonding
Replies: 6
Views: 49

Re: Electron Relationship in Bonding

The more bonds there are, the less lone pairs the atoms will have (i.e. two atoms joined with a triple bond have less lone pairs than two atoms joined in a single bond because more electrons are involved in the bond). Thus, molecules with single bonds have more free electrons, which repel each other...
by Jamie2002
Sun Nov 08, 2020 2:35 pm
Forum: Lewis Structures
Topic: Oxidation Numbers
Replies: 7
Views: 26

Re: Oxidation Numbers

It will probably be covered soon; in the meantime here is a helpful chart in case you want to take a look: https://www.google.com/url?sa=i&url=https%3A%2F%2Fchemistryonline.guru%2Foxidation-number%2F&psig=AOvVaw0JmA1MDHorFL6buG72dNmb&ust=1604961159100000&source=images&cd=vfe&...
by Jamie2002
Sun Nov 08, 2020 2:33 pm
Forum: Ionic & Covalent Bonds
Topic: Oxidation number
Replies: 7
Views: 40

Re: Oxidation number

by Jamie2002
Sun Nov 08, 2020 2:31 pm
Forum: Student Social/Study Group
Topic: Midterm 2 Study Group
Replies: 25
Views: 111

Re: Midterm 2 Study Group

This sounds great! Thanks for organizing it
by Jamie2002
Sun Nov 08, 2020 2:30 pm
Forum: Ionic & Covalent Bonds
Topic: Question about bond Length
Replies: 6
Views: 34

Re: Question about bond Length

Specific bond lengths are usually determined experimentally. You should just know that the more bonds there are, the shorter the bond length is (i.e. a triple bond is shorter and stronger than a single bond).
by Jamie2002
Sun Nov 08, 2020 2:28 pm
Forum: Ionic & Covalent Bonds
Topic: Hydrogen Bonds
Replies: 3
Views: 44

Re: Hydrogen Bonds

The number of bonds that can be formed in general depend on the number of valence electrons an atom has. For example, carbon has 4 valence electrons and can therefore form 4 bonds with hydrogen (4 C-H bonds) to reach an octet. Oxygen has 6 valence electrons, so it needs 2 more electrons to reach an ...
by Jamie2002
Sun Nov 01, 2020 10:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Finding Workshop Answers
Replies: 4
Views: 46

Re: Finding Workshop Answers

If you missed the workshop, I'd advise asking someone who did attend for the key. I think they provide answer keys at the session.
by Jamie2002
Sun Nov 01, 2020 10:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Offline Lecture Content
Replies: 4
Views: 34

Re: Offline Lecture Content

I don't know if you can watch lectures offline, but the video modules on his website can be downloaded.
by Jamie2002
Sun Nov 01, 2020 10:05 pm
Forum: Administrative Questions and Class Announcements
Topic: Textbook
Replies: 4
Views: 24

Re: Textbook

The code should have been emailed to you soon after you bought the textbook. My email got lost in between all my other ones so I would suggest searching up "ASUCLA" or "UCLA Store" in your email to make sure that you see it. After you get the code, you will have access to both sa...
by Jamie2002
Sun Nov 01, 2020 10:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Curve on Midterm
Replies: 9
Views: 96

Re: Curve on Midterm

I believe we can see scores at the end of Week 5!
by Jamie2002
Sun Nov 01, 2020 10:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Participation Points [ENDORSED]
Replies: 62
Views: 885

Re: Participation Points [ENDORSED]

You can click on Quick Links on the upper left hand corner, which will take you to "Your Posts". You can see all the posts you made and make sure you posted 5 times this week.
by Jamie2002
Sun Oct 25, 2020 10:10 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Measuring Uncertainty- Homework 1B.27
Replies: 4
Views: 56

Re: Measuring Uncertainty- Homework 1B.27

Wouldn't the uncertainty be 10 m/s, since it is (5 m/s + 5 m/s) - (5 m/s - 5 m/s)?
by Jamie2002
Sun Oct 25, 2020 9:33 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Measuring Uncertainty- Homework 1B.27
Replies: 4
Views: 56

Re: Measuring Uncertainty- Homework 1B.27

Do we disregard the +/- 5.0 m/s^-1 because the problem calls for the minimum uncertainty?
by Jamie2002
Sun Oct 25, 2020 9:32 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Measuring Uncertainty- Homework 1B.27
Replies: 4
Views: 56

Measuring Uncertainty- Homework 1B.27

A bowling ball of mass 8.00 kg is rolled down a bowling alley lane at 5.00 ± 5.0 m⋅s^−1. What is the minimum uncertainty in its position? The textbook says the uncertainty in velocity is 5.00 m/s, but why? When given a number +/- another number, do we just disregard the second number (in this case t...
by Jamie2002
Fri Oct 23, 2020 9:22 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Module Question #23
Replies: 4
Views: 51

Re: Module Question #23

The uncertainty in position should be 10m, not 5m. So you should use the following equation to solve for the uncertainty in momentum first: delta p >= h/(4pi)(delta x) when you plug everything in, you'd get delta p >= (6.626x10^-34 Js)/(4pi)(10m) and then delta p >= 5.2728 x 10^-36kgms^-1 After, yo...
by Jamie2002
Fri Oct 23, 2020 9:03 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Module Question #23
Replies: 4
Views: 51

Module Question #23

You are caught in a radar trap and hope to show that the speed measured by the radar gun is in error due to the Heisenberg uncertainty principle. If you assume that the uncertainty in your position was +/- 5 m when your speed was measured, and that the car has a mass of 2150 kg, what is your calcula...
by Jamie2002
Wed Oct 21, 2020 9:56 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module #29
Replies: 9
Views: 74

Re: Photoelectric Effect Module #29

Before you divide h by v, I think you need to add together the kinetic energy of the ejected electron (E excess ) with the kinetic energy needed to remove that electron (E threshold ) to get the energy of the incident light, then find its frequency Adalia is right; energy must be conserved . Theref...
by Jamie2002
Wed Oct 21, 2020 9:52 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 188
Views: 13852

Re: Advice from a Medical Student - Part II [ENDORSED]

This is so amazing! Can I ask what internships/ research you took part in and how helpful you think they were towards getting into med school? I did some clinical research during my gap year related to behavioral analysis in children on the autism spectrum. It's not necessarily research that helps ...
by Jamie2002
Wed Oct 21, 2020 12:55 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module #29
Replies: 9
Views: 74

Re: Photoelectric Effect Module #29

I converted to Joules/e-, which gives 2.5 x 10 ^-19 J/e-. However, dividing that by h to get v gives me 3.773 x 10^14 s^-1, which is still wrong. The remaining answer choices are 4.54 x 10^58 Hz and 6.78 x 10^14 Hz. Does any one know which is the right one and why?
by Jamie2002
Wed Oct 21, 2020 12:44 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module #29
Replies: 3
Views: 26

Re: Photoelectric Effect Module #29

Great, thank you so much! I totally forgot to use Avogadro's number
by Jamie2002
Wed Oct 21, 2020 12:04 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module #29
Replies: 3
Views: 26

Photoelectric Effect Module #29

Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. How much energy is required to remove an electron from one sodium atom? I thought the energy required to remove the electron is simply the threshold energy ...
by Jamie2002
Wed Oct 21, 2020 12:02 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module #29
Replies: 9
Views: 74

Re: Photoelectric Effect Module #29

Correction: This is for Question 30
by Jamie2002
Wed Oct 21, 2020 12:01 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module #29
Replies: 9
Views: 74

Photoelectric Effect Module #29

Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. What is the frequency of the incident light on the sodium metal surface? I calculated the kinetic energy to be 1.99 x 10 ^-19 J. The way I approached the pr...
by Jamie2002
Sun Oct 18, 2020 9:06 pm
Forum: Administrative Questions and Class Announcements
Topic: do we have to have another webcam for this class?
Replies: 3
Views: 24

Re: do we have to have another webcam for this class?

You need another webcam (like zoom on your phone) to show your desk. Using respondus on your laptop will exit you out of zoom. Hope this helps!
by Jamie2002
Sun Oct 18, 2020 9:05 pm
Forum: Administrative Questions and Class Announcements
Topic: 14A webpage password
Replies: 4
Views: 26

Re: 14A webpage password

It's LL14A20 :)
by Jamie2002
Sun Oct 18, 2020 8:49 pm
Forum: Administrative Questions and Class Announcements
Topic: UCLA Store Updates on Ebook/Sapling access card
Replies: 16
Views: 128

Re: UCLA Store Updates on Ebook/Sapling access card

I ordered mine during Week 0 and I still haven't received my code so you're not alone. I would send them an email though!
by Jamie2002
Sun Oct 18, 2020 8:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Respondus
Replies: 4
Views: 30

Re: Respondus

Your TA should go over it with you :) But I think having respondus on your laptop and zoom on your phone to show your desk should be good enough!
by Jamie2002
Sun Oct 18, 2020 8:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Built-in webcams/Equipment request [ENDORSED]
Replies: 22
Views: 696

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

Having zoom on your phone should be good enough! At least that is what my TA told me
by Jamie2002
Sun Oct 18, 2020 8:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Where can I buy a webcam for a reasonable price?
Replies: 60
Views: 912

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

You can check ebay for a decently priced one! Or you can just use zoom on your phone while taking the exam on your laptop.
by Jamie2002
Sun Oct 11, 2020 9:21 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test Accuracy
Replies: 13
Views: 87

Re: Test Accuracy

You can also look at sig fig rules - there are a certain amount of sig figs based on what kind of mathematical operation was used in the problem.
by Jamie2002
Sun Oct 11, 2020 6:01 pm
Forum: SI Units, Unit Conversions
Topic: Textbook
Replies: 22
Views: 164

Re: Textbook

There is a free trial available. Just follow the sapling link on CCLE and will be directed to signing up for one!
by Jamie2002
Sun Oct 11, 2020 6:00 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 153
Views: 105000

Re: Reading the textbook [ENDORSED]

I definitely relate to getting intimidated by reading the textbook but it is a really helpful resource. The content might be dense but try to space out your readings so that you can focus more!
by Jamie2002
Sun Oct 11, 2020 5:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 188
Views: 13852

Re: Advice from a Medical Student - Part II [ENDORSED]

This is so amazing! Can I ask what internships/ research you took part in and how helpful you think they were towards getting into med school?
by Jamie2002
Sun Oct 11, 2020 5:56 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 200
Views: 140743

Re: Rusty on High School Chem [ENDORSED]

Reading ahead is always a good tactic to make sure you aren't loss while in class. The lecture will be more easy to follow and you can focus more on the content rather than just copying down notes. That said, notes are always a good thing to take so that you can look back on them when studying for t...
by Jamie2002
Sun Oct 11, 2020 5:53 pm
Forum: SI Units, Unit Conversions
Topic: Showing Work
Replies: 8
Views: 45

Re: Showing Work

Units help keep the work more clear and are useful for checking (i.e. the units cancel out to give me an answer with the desired units). I would recommend just writing units as part of a good habit!

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