Search found 40 matches

by LexyDenaburg_3A
Sun Nov 22, 2020 8:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polarity from lewis structure
Replies: 7
Views: 17

polarity from lewis structure

Given the lewis structure of CO2, is it polar?
by LexyDenaburg_3A
Sun Nov 22, 2020 8:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: linear shape?
Replies: 5
Views: 20

linear shape?

How can we determine which molecules are linear given the chemical formula?
by LexyDenaburg_3A
Sun Nov 22, 2020 8:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: sapling #4
Replies: 3
Views: 16

sapling #4

A question on sapling says
"How many outer atoms and lone pairs are present in a molecule with a square pyramidal shape?"

How are we supposed to determine the lone pairs from this shape?
by LexyDenaburg_3A
Sun Nov 22, 2020 8:27 pm
Forum: General Science Questions
Topic: curve
Replies: 3
Views: 24

curve

Does anyone know if final grades are curved?
by LexyDenaburg_3A
Sun Nov 22, 2020 8:03 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8190
Views: 1429085

Re: Post All Chemistry Jokes Here

Why did the white bear dissolve in water?

Because it was polar!
by LexyDenaburg_3A
Sun Nov 22, 2020 8:01 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: shape, structure
Replies: 4
Views: 11

shape, structure

Will we need to know what the shape of a molecule is from it's name on the final?
by LexyDenaburg_3A
Mon Nov 16, 2020 12:15 pm
Forum: General Science Questions
Topic: midterm 2
Replies: 4
Views: 39

midterm 2

Will we need to calculate dipole moments on midterm 2?
by LexyDenaburg_3A
Mon Nov 16, 2020 12:13 pm
Forum: General Science Questions
Topic: midterm 2
Replies: 6
Views: 57

midterm 2

Does midterm 2 have a review session?
by LexyDenaburg_3A
Mon Nov 16, 2020 12:12 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8190
Views: 1429085

Re: Post All Chemistry Jokes Here

What's the show cesium and Iodine love watching?

CSI
by LexyDenaburg_3A
Fri Nov 13, 2020 1:36 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: Sapling #13 (hydrogen bonds)
Replies: 1
Views: 16

Sapling #13 (hydrogen bonds)

One of the questions on Sapling says: "Urea is an organic compound widely used as a fertilizer. Its solubility in water allows it to be made into aqueous fertilizer solutions and applied to crops in a spray. What is the maximum theoretical number of water molecules that one urea molecule can hy...
by LexyDenaburg_3A
Fri Nov 13, 2020 1:13 pm
Forum: Resonance Structures
Topic: Oxidation numbers
Replies: 5
Views: 31

Oxidation numbers

How can we tell what the oxidation number is when given a resonance structure? Why are oxidation numbers important?
by LexyDenaburg_3A
Sun Nov 08, 2020 8:08 pm
Forum: Bond Lengths & Energies
Topic: Bond length
Replies: 11
Views: 39

Bond length

When it comes to bond length, is a single bond shorter than a triple bond? I'm kind of confused on how to order lengths of bonds.
by LexyDenaburg_3A
Sun Nov 08, 2020 8:06 pm
Forum: Resonance Structures
Topic: Formal charge on different resonance structures
Replies: 3
Views: 16

Formal charge on different resonance structures

When given different resonance structures, how does formal charge tell us which structure is most plausible?
by LexyDenaburg_3A
Sun Nov 08, 2020 8:03 pm
Forum: Lewis Acids & Bases
Topic: Acid vs. Base
Replies: 8
Views: 34

Acid vs. Base

How are we supposed to tell if a molecule is an acid or a base? I know that if it donates electrons then it's a base and if it accepts electrons then it's an acid but is there a more in depth explanation?
by LexyDenaburg_3A
Thu Nov 05, 2020 6:27 pm
Forum: General Science Questions
Topic: Sapling HW question
Replies: 2
Views: 30

Sapling HW question

There is a question on sapling that says: "The formulas of the bromate ion, BrO−3, and chlorate ion, ClO−3, are very similar. However, the formulas of the nitrate ion and phosphate ion contain different numbers of oxygen atoms. This is also true for the formulas of the nitrite ion and phosphite...
by LexyDenaburg_3A
Wed Nov 04, 2020 2:36 pm
Forum: Lewis Acids & Bases
Topic: Octet question
Replies: 7
Views: 55

Octet question

When drawing Lewis structures, how can we tell if it's okay that a molecule doesn't have an octet? For example, Boron on BF3 (lecture example)? How do we know that it's correct if Boron doesn't form an octet?
by LexyDenaburg_3A
Fri Oct 30, 2020 2:51 pm
Forum: Trends in The Periodic Table
Topic: Trends
Replies: 14
Views: 68

Trends

Can someone explain how the sizes of the atomic/ionic radius works? I'm struggling with remembering how big/small a radius is according to where the element is on the periodic table.
by LexyDenaburg_3A
Fri Oct 30, 2020 2:48 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Vs. Covalent
Replies: 7
Views: 40

Ionic Vs. Covalent

Can someone explain the main difference between ionic and covalent bonds?
by LexyDenaburg_3A
Fri Oct 30, 2020 2:46 pm
Forum: Octet Exceptions
Topic: Octet Exceptions
Replies: 10
Views: 36

Re: Octet Exceptions

Are these the only exceptions to the rule in the whole periodic table? Not just the ones we will be working with?
by LexyDenaburg_3A
Fri Oct 30, 2020 2:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Participation Points [ENDORSED]
Replies: 62
Views: 885

Re: Participation Points [ENDORSED]

Thank you for this clarification!! I was wondering the same thing. Just to be sure, any post counts as points for that week correct?
by LexyDenaburg_3A
Fri Oct 30, 2020 2:30 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers Question
Replies: 2
Views: 37

Quantum Numbers Question

How do we tell how many quantum numbers specifies a subshell?
by LexyDenaburg_3A
Fri Oct 30, 2020 12:45 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8190
Views: 1429085

Re: Post All Chemistry Jokes Here

What is a cation afraid of?

A dogion
by LexyDenaburg_3A
Sun Oct 25, 2020 10:58 pm
Forum: *Shrodinger Equation
Topic: Schrodinger on MT
Replies: 7
Views: 50

Re: Schrodinger on MT

I've mostly heard that Schrodinger on the MT will be more conceptual from UA's and TA's!!
by LexyDenaburg_3A
Sun Oct 25, 2020 12:33 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1B.5A
Replies: 1
Views: 15

1B.5A

I'm pretty confused still on the uncertainty problems. Can someone explain how to start this problem?
A proton is accelerated in a cyclotron to a very high speed that is known to within 3.0 × 10^2 km⋅s^−1. What is the minimum uncertainty in its position?
by LexyDenaburg_3A
Sun Oct 25, 2020 11:50 am
Forum: Properties of Light
Topic: Emission/Absorption
Replies: 6
Views: 61

Re: Emission/Absorption

Thank you guys this helped a ton!!
by LexyDenaburg_3A
Sat Oct 24, 2020 5:54 pm
Forum: Photoelectric Effect
Topic: Textbook 1B.3A problem
Replies: 2
Views: 36

Textbook 1B.3A problem

Hi, there is a problem from the textbook that says
"The work function of zinc is 3.63 eV. What is the longest wavelength of electromagnetic radiation that could eject electrons from zinc?"

Can anyone walk me through how to start this problem?
by LexyDenaburg_3A
Fri Oct 23, 2020 4:44 pm
Forum: Properties of Light
Topic: Emission/Absorption
Replies: 6
Views: 61

Emission/Absorption

How do we differentiate what n1 and n2 should be if the question doesn't state it directly? I know that emitted means that it is going back down to the ground state and absorbed means that the particle is excited. Can anyone explain this further?
by LexyDenaburg_3A
Wed Oct 21, 2020 2:31 pm
Forum: General Science Questions
Topic: Lecture Question
Replies: 4
Views: 43

Lecture Question

In Wednesday's lecture of week 3, in the "incorrect atomic model" example, professor uses 9.1 x 10^-31 kg as the mass of the electron to find delta v. How did he get this number?
by LexyDenaburg_3A
Sun Oct 18, 2020 8:26 pm
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 74
Views: 48780

Re: How to find my posts

Thank you this was all super helpful!!
by LexyDenaburg_3A
Sun Oct 18, 2020 8:25 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 200
Views: 140743

Re: Rusty on High School Chem [ENDORSED]

I'm in a similar place as well. I haven't taken chemistry since sophomore year of high school and I'm a second year. I find myself taking a lot of time trying to reteach myself a lot of the material and it can just be a bit stressful.
by LexyDenaburg_3A
Sun Oct 18, 2020 8:19 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8190
Views: 1429085

Re: Post All Chemistry Jokes Here

Jordan_OBrien_2k wrote:Helium walks into a bar,
The bar tender says "We don't serve noble gasses in here."
Helium doesn't react.




This is a good one!!!
by LexyDenaburg_3A
Sun Oct 18, 2020 8:19 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8190
Views: 1429085

Re: Post All Chemistry Jokes Here

Did you know that Oxygen went for a second date with Potassium?

How did it go?

It went OK2
by LexyDenaburg_3A
Sun Oct 18, 2020 8:10 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]

I'm in discussion 3A, does anyone know if we are allowed to use our phones for all discussions or is it up to our TA?
by LexyDenaburg_3A
Fri Oct 16, 2020 1:30 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Video Module Question
Replies: 2
Views: 19

Atomic Spectra Video Module Question

In the video module, professor talks about the equation En = -hR/n^2 for H-atom. Can anyone give more clarification on what the negative sign means in the equation? I was getting kind of confused when he was talking about the energy state.
by LexyDenaburg_3A
Thu Oct 08, 2020 4:05 pm
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Grade
Replies: 12
Views: 118

Re: Chemistry Community Grade

I was a little confused on this one in the syllabus too but thank you for clarification!!
by LexyDenaburg_3A
Thu Oct 08, 2020 4:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 221
Views: 115590

Re: Advice from a Medical Student [ENDORSED]

This is such motivating and great advice to hear!!! Thank you so much for posting.
by LexyDenaburg_3A
Thu Oct 08, 2020 3:57 pm
Forum: Molarity, Solutions, Dilutions
Topic: Sapling Week 1 HW_problem #9
Replies: 9
Views: 99

Re: Sapling Week 1 HW_problem #9

I also had trouble with this homework problem. I feel like I understand how to do the material, but I can get confused in word problems on where to start. All of this helped a TON though thank you everyone!!
by LexyDenaburg_3A
Thu Oct 08, 2020 3:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Accessing the E-textbook [ENDORSED]
Replies: 58
Views: 6054

Re: Accessing the E-textbook [ENDORSED]

I'm still a bit confused on how we get the E-book. After ordering through the UCLA Store, and getting the access code for Sapling, is the E-book just a link for the pdf file that also comes in the mail (or through email in recent cases) or is it accessible through Sapling? It's accessible through S...
by LexyDenaburg_3A
Thu Oct 08, 2020 3:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Step Up Sessions
Replies: 71
Views: 4352

Re: Step Up Sessions

For anyone who was wondering about the step up sessions, I went to one and absolutely loved it!! I'm going to keep making time for it because it seriously helped further my understanding of fundamental topics.

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