Search found 48 matches

Sun Jan 17, 2021 11:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Week 1 #10
Replies: 8
Views: 28

Re: Sapling Week 1 #10

Because you know the concentrations for N2O4 and NO2, you just plug them into the equation for the equilibrium constant --> (NO2)^2/(N2O4)
Sun Jan 17, 2021 11:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Units to know
Replies: 11
Views: 24

Re: Units to know

newton, pascal, and meters are all untis of pressure I believe
Sun Jan 17, 2021 11:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: cancelling out variables in K eq
Replies: 4
Views: 12

Re: cancelling out variables in K eq

I think you maybe forgot to square X
Sun Jan 17, 2021 11:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Reactants and Products
Replies: 9
Views: 31

Re: Reactants and Products

I think everyone said it well, yes that is technically true. Going off of left vs. right may lead you to a wrong answer though if the reactant and product were some how not in the right order. Just make sure to know it's the proper syntax to reactant --> product
Sun Jan 17, 2021 11:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: C in ICE Box
Replies: 19
Views: 52

Re: C in ICE Box

so you couldn't have a positive reactant and positive product value, one needs to be negative?
Sun Jan 10, 2021 8:22 pm
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Posts in 14B [ENDORSED]
Replies: 107
Views: 1752

Re: Chemistry Posts in 14B[ENDORSED]

Does anyone know if literally anything we write counts towards the five posts per week?? For example, would this post count?
Sun Jan 10, 2021 8:20 pm
Forum: Ideal Gases
Topic: Units of Temperature
Replies: 82
Views: 287

Re: Units of Temperature

Kelvin!! Thanks for the question!
Wed Dec 09, 2020 9:20 pm
Forum: Administrative Questions and Class Announcements
Topic: Do we need to memorize all 15 shapes
Replies: 5
Views: 51

Re: Do we need to memorize all 15 shapes

I think you should memorize all of them but I remember one of the UAs saying that there are some shapes such as T-shape being pretty rare to occur in problems. The ones I put an emphasis on were bent, linear, tetrahedral, trigonal planar, and trigonal pyramidal but yeah I'd still try and memorize a...
Wed Dec 09, 2020 9:05 pm
Forum: Administrative Questions and Class Announcements
Topic: Do we need to memorize all 15 shapes
Replies: 5
Views: 51

Do we need to memorize all 15 shapes

I know we should have a general idea of how e- density correlates with molecular shape depending on number of Lone pairs, but do we have to memorize literally each one from a VSEPR Chart. There are 15 possible shapes
Sun Dec 06, 2020 10:41 pm
Forum: Naming
Topic: Sapling 1
Replies: 34
Views: 166

Re: Sapling 1

Hey just to clarify, the final answer is tetraamminedichloro cobalt (III) chloride. I spelled the ammine part wrong and it said it was wrong three times, I was so confused why.
Sun Dec 06, 2020 10:35 pm
Forum: Biological Examples
Topic: naming [Co(NH3)3Cl3]
Replies: 5
Views: 42

Re: naming [Co(NH3)3Cl3]

Thank you this really helped me with question 1 too!
Sun Dec 06, 2020 10:25 pm
Forum: Student Social/Study Group
Topic: Evaluations
Replies: 17
Views: 91

Re: Evaluations

Does anyone know if they count for credit?
Sun Dec 06, 2020 10:24 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra Credit
Replies: 13
Views: 122

Re: Extra Credit

I hope that there will be "easy questions" on the final that are like extra credit, but for classes that do offer extra credit, they usually do tell you at the beginning :/
Sun Dec 06, 2020 10:23 pm
Forum: Administrative Questions and Class Announcements
Topic: CCLE Lectures
Replies: 9
Views: 62

Re: CCLE Lectures

It just worked for me on Chrome!
Sun Nov 29, 2020 10:34 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids/Bases
Replies: 7
Views: 83

Re: Acids/Bases

It's based on the concentration/ratio of hydrogen and hydroxyl ions in the water, basically. At least I think so, that's how I think of it and it helps!
Sun Nov 29, 2020 10:31 pm
Forum: Student Social/Study Group
Topic: studying for exams
Replies: 21
Views: 251

Re: studying for exams

105405231 wrote:Has anyone already formed a Study Group for the final (Fall Quarter 2020)?

There is a group me that was made a while ago but there's a lot of people on it! Not much going on there but it seemed like a good way to get people connected!
Sun Nov 29, 2020 10:26 pm
Forum: Student Social/Study Group
Topic: Tips for Staying Focused
Replies: 52
Views: 522

Re: Tips for Staying Focused

Aw this is such a nice thread! Honestly, I'm a tutor so I have spent a lot of time looking in how to learn. There are so many resources on Youtube and many blogs you can find with a Google search. MedSchoolInsiders on YouTube has great study tips. I'm not a pre-med but I was considering it and I alw...
Sun Nov 29, 2020 10:16 pm
Forum: Administrative Questions and Class Announcements
Replies: 11
Views: 98

Hey so you can actually calculate this and it is different for each class. You can even calculate what score you need on each individual assignment. Total points * (% grade you want) = # of points needed/ total points Total points of assignment * (points needed on assignment) = # of points from assi...
Sun Nov 29, 2020 10:12 pm
Forum: Administrative Questions and Class Announcements
Topic: 14B Enrollment [ENDORSED]
Replies: 26
Views: 1341

Re: 14B Enrollment[ENDORSED]

I am currently waitlisted as well, does anyone know if this means we don't need a PTE number or we are automatically sent one?
Wed Nov 11, 2020 10:30 am
Forum: Octet Exceptions
Topic: Radicals, which atoms lacks electron?
Replies: 3
Views: 39

Re: Radicals, which atoms lacks electron?

I think that the only exceptions we need to know to the Octet rule are: More than an octet: Chromium and Copper Chromium : we expect a configuration including 3d^{4} if we look at the PT, however, the observed configuration is actually [Ne] 3s^{2} 3p^{6} 3d^{5} 4s^{1} Copper : we expect to see 3d^{9...
Wed Nov 11, 2020 10:16 am
Forum: Formal Charge and Oxidation Numbers
Topic: Lowering Formal Charges
Replies: 7
Views: 58

Re: Lowering Formal Charges

The only way you can make an alternative formal charge would be to redraw the Lewis structure, however, the molecule must have resonance. Resonance means there is a blending of regular (single, double, triple) bond lengths, which occurs when the structure has multiple (possible) bonds in different l...
Wed Nov 11, 2020 10:09 am
Forum: General Science Questions
Topic: Midterm 1 Review
Replies: 3
Views: 89

Re: Midterm 1 Review

Great thank you so much!
Tue Nov 10, 2020 6:42 pm
Forum: General Science Questions
Topic: Midterm 1 Review
Replies: 3
Views: 89

Midterm 1 Review

Hi, does anyone (or @ Dr. Lavelle) know when we will be able to review our Midterm 1 test scores?

Even though it's not material covered on MT 2, it is helpful to see if the way we were studying was effective and how it wasn't based on our mistakes.

Thanks!
Mon Nov 09, 2020 5:33 pm
Forum: Resonance Structures
Topic: Oxidation Numbers
Replies: 4
Views: 28

Re: Oxidation Numbers

Thanks, everyone, that was super helpful!
Sun Nov 08, 2020 7:48 pm
Forum: Resonance Structures
Topic: Oxidation Numbers
Replies: 4
Views: 28

Oxidation Numbers

Hey does anyone know if we have to memorize the oxidation numbers or if they will be given to us? Thanks!
Sun Nov 08, 2020 7:47 pm
Forum: Coordinate Covalent Bonds
Topic: Just to clear it up
Replies: 13
Views: 238

Re: Just to clear it up

Yes, that is true! Just wanted to post about this resource, Khan Academy. I'm not sure if a lot of people are familiar with it but it is a really helpful additional resource to this class, as it goes over a lot of the same concepts. It's all free btw! The course subject is AP/College Chemistry and h...
Sun Nov 08, 2020 7:21 pm
Forum: Sigma & Pi Bonds
Topic: sigma and pi bonds
Replies: 27
Views: 590

Re: sigma and pi bonds

That is true! If you haven't seen this video, https://www.youtube.com/watch?v=pT8nrBrTOm4 you should check it out! It's actually really helpful. I look up videos on youtube for most topics! Hope this helps!
Sun Nov 08, 2020 7:17 pm
Forum: Lewis Structures
Topic: Sapling #3
Replies: 10
Views: 87

Re: Sapling #3

If you haven't seen the video called Bonding Models and Lewis Structures: Crash Course Chemistry #24 by Crash Course on YouTube, you should check it out! It helped me a lot!

Sun Nov 08, 2020 7:15 pm
Forum: Ionic & Covalent Bonds
Topic: Chemical Bonds
Replies: 12
Views: 65

Re: Chemical Bonds

Because the molecular force is stronger with a double bond, basically like the atoms are held tighter
Sun Nov 01, 2020 11:38 pm
Forum: Trends in The Periodic Table
Topic: studying
Replies: 12
Views: 59

Re: studying

I think doing the practice problems literally over and over again is the number 1 and only way to study. Concepts are super duper important, but the way you test your ability to apply the concepts is with practice problems & Dr. Lavelle gives us so many to choose from! Best of luck fellow chemis...
Sun Nov 01, 2020 11:36 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Sapling #21
Replies: 4
Views: 40

Re: Sapling #21

Hi, just something that made this super clear for me was drawing something like Figure 1.E.1 in the text book. If you draw the relative energies of the shells, subshells, and orbitals, and fill in each line with two electrons (depending on molecule) this should make it clear how many possibilities y...
Sun Nov 01, 2020 11:33 pm
Forum: Einstein Equation
Topic: E=hv vs E=hf
Replies: 15
Views: 120

Re: E=hv vs E=hf

Like others have said, there is no difference!
Mon Oct 26, 2020 8:39 pm
Forum: Properties of Electrons
Topic: So confused on Sapling Question
Replies: 4
Views: 49

Re: So confused on Sapling Question

Great thank you guys both so much!!!
Mon Oct 26, 2020 2:09 am
Forum: Properties of Electrons
Topic: So confused on Sapling Question
Replies: 4
Views: 49

So confused on Sapling Question

Question: As you may well know, placing metal objects inside a microwave oven can generate sparks. Two of your friends are arguing over the cause of the sparking, with one stating that the microwaves "herd" electrons into "pointy" areas of the metal object, from which the electro...
Sun Oct 25, 2020 11:09 pm
Forum: Properties of Electrons
Topic: Wave Properties and Conceptual
Replies: 1
Views: 29

Re: Wave Properties and Conceptual

Maybe the significance of the photoelectric effect, intensity, and light as a wave and a photon. Because increasing intensity did not cause electrons to be ejected, correlated with a wave's amplitude, unlike classic mechanics where, for example, a giant wave at the beach would feel much stronger tha...
Mon Oct 19, 2020 11:55 pm
Forum: Properties of Light
Topic: IR faster than Visible Light?
Replies: 5
Views: 22

Re: IR faster than Visible Light?

In one of the Sapling questions, it said "IR is faster than visible light", so I am a bit confused.
Mon Oct 19, 2020 5:26 pm
Forum: Properties of Light
Topic: IR faster than Visible Light?
Replies: 5
Views: 22

IR faster than Visible Light?

I am very confused about why this is true.

I thought that IR had a longer wavelength and lower frequency than visible light, and also less energy.

I am confused
Mon Oct 19, 2020 5:00 pm
Forum: Properties of Light
Topic: Fairly Easy Sapling Question
Replies: 1
Views: 31

Fairly Easy Sapling Question

Consider a photon with a wavelength lambda, frequency V, and energy E. If a pulse of light containing 100 of these photons then... The answer is wavelength= lambda frequency = V and energy = 100 E I understand that the wavelength and frequency remain the same because each photon is of the same "...
Mon Oct 19, 2020 1:12 pm
Forum: Student Social/Study Group
Topic: Forming Virtual Study Group
Replies: 31
Views: 172

Re: Forming Virtual Study Group

Here is the link to join the group me for the virtual study group!

https://groupme.com/join_group/63480724/SNfJTJb1
Sun Oct 18, 2020 9:56 pm
Forum: Properties of Electrons
Topic: Ionizing Electrons vs Ejecting Electrons
Replies: 6
Views: 47

Re: Ionizing Electrons vs Ejecting Electrons

I think he means that the atom becomes ionized because it is losing an electron and therefore becoming negative or more negative. So as long as electrons are being ejected, the atom is being ionized.
Sun Oct 18, 2020 9:50 pm
Forum: Administrative Questions and Class Announcements
Replies: 3
Views: 27

LL14A20

Haha I forget all the time too!
Sun Oct 18, 2020 9:49 pm
Forum: Student Social/Study Group
Topic: Midterm 1
Replies: 8
Views: 64

Re: Midterm 1

Dr. Lavelle said weeks 1-3 will be covered!
Sun Oct 18, 2020 9:41 pm
Forum: Properties of Light
Topic: Wave properties of light
Replies: 4
Views: 58

Re: Wave properties of light

I think that light is viewable as either a wave or a photon. When Dr. Lavelle talked about the photoelectric effect in Week 2 Monday's lecture, he said that initially, the experiment was not intended to reveal the non-wave like properties of light. However, it was only when they realized that increa...
Sun Oct 18, 2020 9:34 pm
Forum: Student Social/Study Group
Topic: Forming Virtual Study Group
Replies: 31
Views: 172

Re: Forming Virtual Study Group

If you want to email it to me, my email is aflores8721@g.ucla.edu

Thanks!
Sun Oct 18, 2020 9:33 pm
Forum: Student Social/Study Group
Topic: Forming Virtual Study Group
Replies: 31
Views: 172

Re: Forming Virtual Study Group

Sat Oct 10, 2020 6:46 pm
Forum: SI Units, Unit Conversions
Topic: Prefix and Naming Units
Replies: 3
Views: 39

Re: Prefix and Naming Units

In my last chemistry course, we were given formulas and constants, but never SI units. I feel like Dr. Lavelle really cares that we understand the concepts and know how to apply then rather than test us on memorizable or Googleable things. I think you should probably ask your TA or Dr. Lavelle in of...
Sat Oct 10, 2020 6:41 pm
Forum: Limiting Reactant Calculations
Topic: Theoretical yield: confused
Replies: 8
Views: 106

Theoretical yield: confused

I am a bit confused by what theoretical yield actually is. In the Wednesday week 1 lecture, Dr. Lavelle says the theoretical yield is the "100%" and ideal yield, however, in step 7 of "Identifying a Limiting Reactant" we are supposed to convert moles of product to grams. He then ...
Sat Oct 10, 2020 4:49 pm
Forum: Student Social/Study Group
Topic: Forming Virtual Study Group
Replies: 31
Views: 172

Forming Virtual Study Group

Hi everyone, hope everyone is having a great start to their quarter!

If anyone is interested in forming a Zoom study group, make a comment!