Search found 41 matches

by Joel Meza 2E
Sun Nov 29, 2020 6:37 pm
Forum: Student Social/Study Group
Topic: Midterm Exam Questions
Replies: 16
Views: 71

Re: Midterm Exam Questions

Try talking to your TA to set up an appointment to go over your own exam if you can't have a general discussion of it because of time in your discussion class.
by Joel Meza 2E
Sun Nov 29, 2020 6:34 pm
Forum: Student Social/Study Group
Topic: Happy Thanksgiving!
Replies: 35
Views: 109

Re: Happy Thanksgiving!

Happy late thanksgiving, my family makes tamales this time of year for the holidays.
by Joel Meza 2E
Sun Nov 29, 2020 6:30 pm
Forum: Student Social/Study Group
Topic: Chem 14B with 20L
Replies: 6
Views: 71

Re: Chem 14B with 20L

Is there no prerequisite for 20L that is a 20 series class? Or in other words, we don't have to previously taken a specific 20 series class to enroll in 20L? Nope! 14A, 20A, and 20AH can each fulfill the prerequisite, and 14B, 20B, and 20BH can fulfill the corequisite. Ah okay, thank you for the cl...
by Joel Meza 2E
Sun Nov 29, 2020 6:26 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Lecture #24 Ligands and Complexes
Replies: 5
Views: 19

Re: Lecture #24 Ligands and Complexes

Yeah, he meant tetrahedral instead of octahedral.
by Joel Meza 2E
Sun Nov 29, 2020 6:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number
Replies: 13
Views: 29

Re: coordination number

Yes, it is equal to the total number of bonds. A single bond gives one, double bond gives two, and a triple bond gives 3.
by Joel Meza 2E
Sun Nov 29, 2020 6:22 pm
Forum: Student Social/Study Group
Topic: Chemistry Among Us
Replies: 43
Views: 244

Re: Chemistry Among Us

I think sticking close with purple is a safer bet.
by Joel Meza 2E
Sun Nov 22, 2020 1:29 am
Forum: Bond Lengths & Energies
Topic: IMF vs. Intramolecular Forces
Replies: 7
Views: 51

Re: IMF vs. Intramolecular Forces

I believe that question would be asking about intramolecular forces because you are comparing the bonds within two separate molecules (meaning atom with atom in each molecule).
by Joel Meza 2E
Sun Nov 22, 2020 1:25 am
Forum: Student Social/Study Group
Topic: Grading Scale for Chem14A
Replies: 22
Views: 149

Re: Grading Scale for Chem14A

I hope he does give back points, but maybe that would make us feel a little too comfortable.
by Joel Meza 2E
Sun Nov 22, 2020 1:23 am
Forum: Student Social/Study Group
Topic: Chem 14B with 20L
Replies: 6
Views: 71

Re: Chem 14B with 20L

Is there no prerequisite for 20L that is a 20 series class? Or in other words, we don't have to previously taken a specific 20 series class to enroll in 20L?
by Joel Meza 2E
Sun Nov 22, 2020 1:20 am
Forum: Student Social/Study Group
Topic: Periodic Table on Midterm
Replies: 5
Views: 34

Re: Periodic Table on Midterm

You're only ever allowed a non-marked version of the periodic table on Lavelle's website. Just make sure you know the trends by memory for all of his exams.
by Joel Meza 2E
Sun Nov 22, 2020 1:19 am
Forum: Student Social/Study Group
Topic: Winter 2021 Classes
Replies: 20
Views: 138

Re: Winter 2021 Classes

As long as you have 12 units you're good!
by Joel Meza 2E
Sat Nov 14, 2020 8:11 pm
Forum: Bond Lengths & Energies
Topic: Size
Replies: 13
Views: 125

Re: Size

005162520 wrote:Does bond length also affect how strong the bond is?


Yes, the larger a bond length the further two atoms are and the weaker than bond is.
by Joel Meza 2E
Sat Nov 14, 2020 8:07 pm
Forum: Bond Lengths & Energies
Topic: Sapling HW Bond Length
Replies: 7
Views: 34

Re: Sapling HW Bond Length

It is actually S that has a larger atomic radius than O. You might have confused the trend for atomic radii on the period table.
by Joel Meza 2E
Sat Nov 14, 2020 8:04 pm
Forum: Dipole Moments
Topic: Sapling #19
Replies: 12
Views: 48

Re: Sapling #19

Yes it is a mistake, it should be SO2.
by Joel Meza 2E
Sat Nov 14, 2020 8:00 pm
Forum: Student Social/Study Group
Topic: VSEPR Chart
Replies: 3
Views: 26

Re: VSEPR Chart

We are expected to know/memorize the chart because it's not going to be given.
by Joel Meza 2E
Sat Nov 14, 2020 7:58 pm
Forum: Student Social/Study Group
Topic: Chemistry Among Us
Replies: 43
Views: 244

Re: Chemistry Among Us

Call out green, why would they extend their arm?
by Joel Meza 2E
Sun Nov 08, 2020 2:17 pm
Forum: Student Social/Study Group
Topic: Studying From Home
Replies: 91
Views: 293

Re: Studying From Home

I would recommend taking consistent rest breaks to relax your eyes off of your computer screen. We are required to now spend hours looking at a computer screen which fatigues our sight and mind. Definitely use your breaks to do something where you don't look at any screens. I usually take a nap sinc...
by Joel Meza 2E
Sun Nov 08, 2020 2:12 pm
Forum: Electronegativity
Topic: Atom size
Replies: 22
Views: 735

Re: Atom size

As you go up a group and also across a period to the right on the periodic table, the electronegativity increases. Now, if you go down a group and towards the left on the periodic table, the size of the atom increases.
by Joel Meza 2E
Sun Nov 08, 2020 2:06 pm
Forum: Lewis Structures
Topic: Negative Sign
Replies: 12
Views: 49

Re: Negative Sign

If you are talking about the charge of the molecule represented by the Lewis structure, then the charge (along with its number) will go outside of the structure's brackets.
by Joel Meza 2E
Sun Nov 08, 2020 2:04 pm
Forum: Student Social/Study Group
Topic: Midterm 1
Replies: 4
Views: 34

Re: Midterm 1

I do not think that we will be reviewing the midterm as we need to move on and prepare for midterm 2. If you have some questions, the drop in sessions should be a good way to get some understanding.
by Joel Meza 2E
Sun Nov 08, 2020 2:02 pm
Forum: Student Social/Study Group
Topic: Chemistry Among Us
Replies: 43
Views: 244

Re: Chemistry Among Us

I would go help shut off the reactor.
by Joel Meza 2E
Sun Nov 01, 2020 4:16 pm
Forum: Trends in The Periodic Table
Topic: Metalloids/Non-Metals on the Periodic Table
Replies: 6
Views: 29

Re: Metalloids/Non-Metals on the Periodic Table

I think mnemonics are great for remembering, but I just have memorized them by remembering a color coordinated periodic table. Maybe try looking at one a couple times a day or using one when you work on problems that require you to refer to the periodic table, so that you get that image in your head...
by Joel Meza 2E
Sun Nov 01, 2020 4:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Fall 2020 Midterm 1 Instructions
Replies: 20
Views: 1056

Re: Fall 2020 Midterm 1 Instructions

I've heard that grading has been delayed for whatever reason, although I'm not sure if that is really the case. So I would assume that we might have to wait a week or two before we receive our scores.
by Joel Meza 2E
Sun Nov 01, 2020 4:02 pm
Forum: Quantum Numbers and The H-Atom
Topic: wavelength
Replies: 13
Views: 52

Re: wavelength

Wavelength cannot be negative, but you might calculate energy to be negative. This would just mean that energy was released in that chemical process described in the question.
by Joel Meza 2E
Sun Nov 01, 2020 3:58 pm
Forum: *Black Body Radiation
Topic: Info for Midterm
Replies: 12
Views: 353

Re: Info for Midterm

Black body radiation isn't something that we go into depth for this course. So it will not be in any midterms or the final.
by Joel Meza 2E
Sun Nov 01, 2020 3:54 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Chem Community Posts
Replies: 10
Views: 54

Re: Chem Community Posts

Also, make sure to create posts that are related to the topic you are posting under. Any posts should be valid as long as you are contributing in some way.
by Joel Meza 2E
Sun Oct 25, 2020 5:01 pm
Forum: Quantum Numbers and The H-Atom
Topic: Emitting a Photon
Replies: 9
Views: 51

Re: Emitting a Photon

A photon is emitted as an electron goes down one energy level. Once it is at the ground state, a photon cannot be emitted as there is no energy level below the ground state.
by Joel Meza 2E
Sun Oct 25, 2020 4:52 pm
Forum: Einstein Equation
Topic: m vs nm
Replies: 66
Views: 361

Re: m vs nm

If I remember correctly, Lavelle mentioned that either unit is fine for a general answer. However, if a question asks for something concerning a wavelength, it is best to convert the units to nanometers (nm) as wavelength is given in that unit.
by Joel Meza 2E
Sun Oct 25, 2020 4:48 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: h/4pi
Replies: 7
Views: 60

Re: h/4pi

We use h/4pi because writing out the actual value of this constant wouldn't be convenient. It is much easier to write this out as h/4pi and then plug in the values into the calculator when it comes time to do so in the question.
by Joel Meza 2E
Sun Oct 25, 2020 4:41 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenbergs equation example from lecture
Replies: 4
Views: 24

Re: Heisenbergs equation example from lecture

That number is the mass of an electron, it's just a given and it is listed on the "Constants and Equations" handout Lavelle provided for us to use during our midterms and final in case you don't memorize it along the incoming weeks.
by Joel Meza 2E
Sun Oct 25, 2020 4:33 pm
Forum: Properties of Electrons
Topic: intensity vs energy
Replies: 25
Views: 130

Re: intensity vs energy

An increase in intensity does not relate to an increase in energy of a photon. Intensity only relates to the number of photons, not the energy each photon has. It is the frequency of a photon that determines its energy.
by Joel Meza 2E
Sun Oct 18, 2020 12:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Accessing the E-textbook [ENDORSED]
Replies: 58
Views: 6396

Re: Accessing the E-textbook [ENDORSED]

If you are still waiting to receive an access code in the mail after purchasing the e-textbook with Sapling through the UCLA store, try calling or e-mailing to see if you can receive your code digitally rather than having to wait.
by Joel Meza 2E
Sun Oct 18, 2020 12:42 pm
Forum: Student Social/Study Group
Topic: groupme?
Replies: 2
Views: 34

Re: groupme?

I am not sure if there is a GroupMe for that specific discussion, but you can ask around about it in the main GroupMe or you can create one with your discussion peers next time you meet them in your weekly discussion zoom call.
by Joel Meza 2E
Sun Oct 18, 2020 12:40 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 205
Views: 141578

Re: Rusty on High School Chem [ENDORSED]

You shouldn't worry too much. A lot of us are also rusty on our chemistry as some of us haven't taken it since our sophomore year in high school. If you ever are in need of any help, you may use Chemistry Community, the step-up sessions, or any of the discussion zoom calls that Lavelle hosts (there ...
by Joel Meza 2E
Sun Oct 18, 2020 12:31 pm
Forum: General Science Questions
Topic: E-Book
Replies: 3
Views: 52

Re: E-Book

On the home page of this course on Sapling, the e-textbook should be located on the very right side of the page under the Clock. It will then open up a new page (where I think you might need to sign in if it is your first time accessing the e-textbook) and you should be good to go.
by Joel Meza 2E
Sun Oct 18, 2020 12:22 pm
Forum: Balancing Chemical Reactions
Topic: States of Molecules
Replies: 9
Views: 84

Re: States of Molecules

I believe that if you're balancing an equation that is already given to you, the states of the molecules should already be given to you too. If they are not, I do not believe that it is necessary to go and find out what state of matter they are in. For knowing which state of matter each molecule is...
by Joel Meza 2E
Sun Oct 11, 2020 11:50 am
Forum: Balancing Chemical Reactions
Topic: States of Matter in Chemical Equations
Replies: 13
Views: 84

Re: States of Matter in Chemical Equations

If the states of matter are given to you in an unbalanced chemical reaction, definitely include them when you balance. However, if the states of matter are not given to you initially, I don't believe it is necessary, at this level, to search the states of matter to include in the balanced chemical r...
by Joel Meza 2E
Sun Oct 11, 2020 11:40 am
Forum: Balancing Chemical Reactions
Topic: States of Molecules
Replies: 9
Views: 84

Re: States of Molecules

I believe that if you're balancing an equation that is already given to you, the states of the molecules should already be given to you too. If they are not, I do not believe that it is necessary to go and find out what state of matter they are in. For knowing which state of matter each molecule is ...
by Joel Meza 2E
Sun Oct 11, 2020 11:32 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Stochiometric Coefficients
Replies: 6
Views: 58

Re: Stochiometric Coefficients

No, stoichiometric coefficients do not have units. They just indicated a number that is related to the number of moles of the compound it represents.
by Joel Meza 2E
Sun Oct 11, 2020 11:29 am
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Reactions Order
Replies: 30
Views: 151

Re: Balancing Chemical Reactions Order

I don't believe there is a correct way to balance chemical reactions, but I find it effective to first balance the element that has the most bonds, which is typically carbon. I hope somewhat helps you out.
by Joel Meza 2E
Sun Oct 11, 2020 11:26 am
Forum: Balancing Chemical Reactions
Topic: Periodic Table
Replies: 50
Views: 410

Re: Periodic Table

I remember Lavelle mentioning that memorizing the periodic table is unnecessary, but it would be helpful to know the atomic masses of some of the more common elements because it saves you time. You will most likely memorize them over time, so I wouldn't worry about dedicated time to memorize solely ...

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