Search found 89 matches

by ariana_apopei1K
Sat Mar 16, 2019 12:02 pm
Forum: Administrative Questions and Class Announcements
Topic: LYNDON'S PORK RAMEN REVIEW
Replies: 37
Views: 2673

Re: LYNDON'S PORK RAMEN REVIEW

michelle wrote:Will you post the answers here as usual?

I think so since the sheet says "Full solutions will be given only during the review session." so maybe regular answers will be posted
by ariana_apopei1K
Tue Mar 12, 2019 11:03 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: graphing
Replies: 1
Views: 41

Re: graphing

We probably don't have to graph any major things. I would just know the graphs we learned in lecture and what k means, what the y intercept means, etc.
by ariana_apopei1K
Tue Mar 12, 2019 11:00 am
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 18
Views: 554

Re: Final

Elle_Mendelson_2K wrote:Does anyone know what the midterm average was?

I don't remember the exact number but I think it was in the low to mid 80's percentage wise
by ariana_apopei1K
Sat Mar 09, 2019 2:48 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7792

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

Julia Lee wrote:Does anyone know if Karen posted worksheet 9 yet?

no it would have been posted here, week 8 is the most recent
by ariana_apopei1K
Wed Mar 06, 2019 11:34 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate-Controlling Step
Replies: 3
Views: 72

Re: Rate-Controlling Step

the slowest step controls the rate since you cannot get any faster than the slowest part
by ariana_apopei1K
Wed Mar 06, 2019 1:10 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Gibbs Free energy and photosynthesis
Replies: 4
Views: 113

Re: Gibbs Free energy and photosynthesis

I was also wondering this, when I look it up online I see a lot of people say it's non-spontaneous
by ariana_apopei1K
Fri Mar 01, 2019 12:02 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: delta G = 0 ??
Replies: 5
Views: 224

Re: delta G = 0 ??

delta G is zero when the reaction is at equilibrium. delta G standard is the same value, whether it's zero or not doesn't matter, because its the calculate of delta G at certain standard conditions.
by ariana_apopei1K
Thu Feb 28, 2019 5:43 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7792

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

Josephine Lu 4L wrote:could someone please explain #8 part a on the electrochemistry worksheet? How do we know that S2O8 2- is reduced and NO is oxidized?

I also have this question
by ariana_apopei1K
Tue Feb 26, 2019 11:29 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L.5 7th ed
Replies: 3
Views: 62

Re: 6L.5 7th ed

I think those half reactions are only considering what is happening to the reactant ion in question. In reality, it would produce HCl, but since each half reaction only considers one ion, they don't include the other. But then again, since HCl is a strong acid, it would fully dissociate anyway. oh ...
by ariana_apopei1K
Tue Feb 26, 2019 7:31 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L.5 7th ed
Replies: 3
Views: 62

6L.5 7th ed

For the rxn Cl2(g) + H2(g) --> HCl (aq) the half rxn's are shown as Cl2 (g) + 2e- -> 2Cl- (aq) and
2H+ (aq) + 2e- --> H2 (g).

How come HCl is dissociated? is it because of its acidity?
by ariana_apopei1K
Tue Feb 26, 2019 7:02 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L.3 part d
Replies: 2
Views: 62

Re: 6L.3 part d

so for the cathode i did O2 --> OH- and treated it as a half reaction in a basic solution because of the OH-. once you balance both sides with H+'s, OH-'s, etc you should get 4e- + 2H2O + O2 -> 4OH- For the anode side you would solve normally, like in an acidic solution. so O2 -> H+ would balance ou...
by ariana_apopei1K
Tue Feb 26, 2019 11:25 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: exothermic reactions are spontaneous reactions
Replies: 1
Views: 47

Re: exothermic reactions are spontaneous reactions

it helps if you look at the equation deltaG=deltaH - T(deltaS). The more negative deltaG is, meaning exothermic, the more chances for delta G to be negative too, meaning spontaneous.
by ariana_apopei1K
Tue Feb 26, 2019 10:53 am
Forum: Balancing Redox Reactions
Topic: Oxidizing vs Reducing Agent
Replies: 3
Views: 66

Re: Oxidizing vs Reducing Agent

the oxidizing agent will be in the reduction half rxn, and the reducing agent will be in the oxidation half rxn
by ariana_apopei1K
Tue Feb 26, 2019 10:47 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Question about cell diagrams
Replies: 2
Views: 56

Re: Question about cell diagrams

I went to a step up session and the UA mentioned that many people have been having issues with weird questions, so I think they'll give us normal ones on the test. At least I hope so haha
by ariana_apopei1K
Sun Feb 24, 2019 9:31 pm
Forum: Balancing Redox Reactions
Topic: 7th edition 6K.1
Replies: 2
Views: 50

Re: 7th edition 6K.1

think of adding H+ the same as balancing the equation. the left side has 6 H's and the right only has 4, so you add 2 H's to even it out
by ariana_apopei1K
Wed Feb 13, 2019 1:05 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Practice problem help
Replies: 2
Views: 84

Re: Practice problem help

I think they're all correct! I was stuck on the one with N2 since it isnt a noble gas, but some places online say that it can be used as an inert gas, so yes there wouldn't be any shift
by ariana_apopei1K
Wed Feb 13, 2019 12:47 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Finding W (degeneracy)
Replies: 4
Views: 263

Re: Finding W (degeneracy)

i believe so yes. its the same as if you would convert the number of moles by multiplying by avo first
by ariana_apopei1K
Wed Feb 13, 2019 12:13 am
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7792

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

Celine Hoh 2L wrote:Quick question for Worksheet 1 ques8:

When I2 is added, neither products nor reactants is favored as I2 is a solid.
What happens when I2 is removed, does the reaction not shift too?

Yeah, since it is a solid it doesn't affect it either way
by ariana_apopei1K
Tue Feb 12, 2019 11:24 am
Forum: Administrative Questions and Class Announcements
Topic: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!
Replies: 49
Views: 3040

Re: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!

Megan_Ervin_1F wrote:when will you post the answers to hotdog?

He mentioned that he won't be posting answers this time
by ariana_apopei1K
Sun Feb 10, 2019 6:33 pm
Forum: Student Social/Study Group
Topic: Lyndon's Review Sess
Replies: 3
Views: 79

Re: Lyndon's Review Sess

Search up hotdog!
by ariana_apopei1K
Thu Feb 07, 2019 3:55 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Study Guides
Replies: 15
Views: 353

Re: Study Guides

Lyndon is probably going to make one that he'll go over in his review session this monday
by ariana_apopei1K
Wed Feb 06, 2019 10:27 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7792

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

For the first law worksheet, how do you do #2? First you have to do stoichiometry to find how many moles of Pb is made from 49.7 g PbO. You multiply the number of moles of product times the enthalpy value given, which gives you the q to plug into your regular q=mC s (Tf-Ti). Once you solve for mass...
by ariana_apopei1K
Wed Feb 06, 2019 10:06 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Question 4C.3 7th edition
Replies: 1
Views: 54

Re: Question 4C.3 7th edition

qp=n(5/2)R(Tf-Ti) with qp= 765 J
by ariana_apopei1K
Wed Feb 06, 2019 8:12 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Constant Pressure/Volume
Replies: 6
Views: 272

Re: Constant Pressure/Volume

Hi, I just checked my notes and i wrote "assume P=1 atm, use PV=nRT), meaning the pressure is constant at 1 atm. Maybe he only said this verbally or something and it wasn't on the slides and you might have missed it? I hope this helps!
by ariana_apopei1K
Wed Feb 06, 2019 8:03 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy Change Due to Temperature Change
Replies: 3
Views: 69

Re: Entropy Change Due to Temperature Change

from what I understood we use Cp when pressure is constant and Cv when the volume is constant to find out how much heat has been gained or lost but I'm not sure if you were looking for something more specific about them
by ariana_apopei1K
Wed Feb 06, 2019 7:58 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: kj v j in calculations?
Replies: 2
Views: 50

Re: kj v j in calculations?

I noticed this too, sometimes they even give the answer in both J and KJ. I doubt you'd be marked wrong on a test for having one over the other though
by ariana_apopei1K
Thu Jan 31, 2019 10:31 pm
Forum: Student Social/Study Group
Topic: Lecture Notes (1/30)
Replies: 4
Views: 129

Re: Lecture Notes (1/30)

Jim Brown 14ALec4 wrote:My handwriting is terrible but

Thank you so much!! life saver
by ariana_apopei1K
Wed Jan 30, 2019 8:20 pm
Forum: Student Social/Study Group
Topic: Lecture Notes (1/30)
Replies: 4
Views: 129

Lecture Notes (1/30)

Hi,
Does anyone have the notes from today's lecture (1/30, Wednesday) and is willing to share them? I was sick and couldn't make it today :(
by ariana_apopei1K
Tue Jan 29, 2019 6:57 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Homework/reading
Replies: 3
Views: 68

Re: Homework/reading

For 7th edition some parts of 4C, 4D, and 4E include stuff that we went over in lecture already but you might still have to skip around
by ariana_apopei1K
Sat Jan 26, 2019 6:50 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy
Replies: 2
Views: 48

Re: Enthalpy

Something is a state function when the path to get from point A to point B does not matter. Since for enthalpy all we care about is what the values are from the start and from the end, that makes it a state function.
by ariana_apopei1K
Mon Jan 21, 2019 9:44 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7792

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

What are the initial values and the Kc value that we have to use for 4d worksheet 1? are the initial values the values from 4b?
by ariana_apopei1K
Mon Jan 21, 2019 9:21 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7792

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

Ray Guo 4C wrote:Don't we need the volume to solve question 5 on worksheet 1?

you can calculate the volume from the info given using PV=nRT!
by ariana_apopei1K
Mon Jan 21, 2019 7:11 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7792

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

For #3 on Worksheet 2, how can you find the Kb value? I'm not quite what is the first step or what the base is. So if percent protonation was 6.7%, then 6.7 = 100 x (x/.1) should give you x. For the ice table I don't think you even need to know the base, so i just wrote " oct + h20 --> OH- + o...
by ariana_apopei1K
Thu Jan 17, 2019 9:36 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Kb memorization? 7th ed. 6D.5
Replies: 1
Views: 192

Kb memorization? 7th ed. 6D.5

Hi all, In part a of this problem, understand how to set up the ice box and how to get to the set up (x^2)/(0.057-x), but I don't know where the solutions manual got 1.8x10^-5 to set it up as equal to. I know that's the Kb of NH3, but are we supposed to know that by heart? or is there a table somewh...
by ariana_apopei1K
Wed Jan 16, 2019 9:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Concentration less than 10^-7
Replies: 4
Views: 55

Re: Concentration less than 10^-7

Basically the acid is so weak the overall solution can be considered neutral. Such a small concentration of H3O+ is pretty much not affecting the pH anymore in the grand scheme of things
by ariana_apopei1K
Wed Jan 16, 2019 9:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Tricks for ICE tables
Replies: 5
Views: 75

Re: Tricks for ICE tables

Also whenever a question specifically gives you an initial value and a Kc value! you can kinda guess you'd have to end up with a quadratic equation to solve the question after that
by ariana_apopei1K
Tue Jan 15, 2019 2:12 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: test 1 [ENDORSED]
Replies: 7
Views: 200

Re: test 1 [ENDORSED]

Not 100% sure, but I think it might include acids/bases since we still have a couple lectures until the test. I'm sure Dr. Lavelle will let us know soon
by ariana_apopei1K
Fri Jan 11, 2019 8:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant Values
Replies: 3
Views: 84

Re: Equilibrium Constant Values

We'll probably be given anything we need to solve the problem, I doubt we have to memorize any values like the ones from the tables some textbook questions have us use.
by ariana_apopei1K
Thu Jan 10, 2019 7:48 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: K vs Q [ENDORSED]
Replies: 7
Views: 172

Re: K vs Q [ENDORSED]

Q changes as a reaction occurs, and K is when said reaction reaches equilibrium. If the reaction does't reach equilibrium, you can't use K, only Q
by ariana_apopei1K
Thu Jan 10, 2019 6:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Audio-Visual Focus-Topics
Replies: 2
Views: 69

Re: Audio-Visual Focus-Topics

I'm not sure if there's a specific place to get answers, but if you post any of the specific questions on here people will definitely help out!
by ariana_apopei1K
Sun Dec 09, 2018 10:21 am
Forum: Administrative Questions and Class Announcements
Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Replies: 118
Views: 7766

Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

Haowen_Liang_3E wrote:for 33a, how do we set up the equation with 1.5mol/L and 0.1155mol/210ml to find the mL require for the 1.5M solution?

1.5 x L1 = .55 x 210 then solve and you should get 77 mL
by ariana_apopei1K
Fri Dec 07, 2018 9:10 am
Forum: Naming
Topic: Final Exam
Replies: 2
Views: 79

Re: Final Exam

If you're asking about the ligands for coord compounds we have to memorize these ones: https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf
by ariana_apopei1K
Thu Dec 06, 2018 10:31 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 28899

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Carissa Young 1C wrote:will there be more worksheets for the recently covered material like acids and bases and coordination compounds ? Thanks

I think this last worksheet was the last one since our final is on Sunday when there would normally be a session
by ariana_apopei1K
Tue Dec 04, 2018 7:54 pm
Forum: Naming
Topic: Textbook Question 9C.1
Replies: 2
Views: 70

Re: Textbook Question 9C.1

It's called ferrate rather than iron because of the overall negative charge on the complex. It's the same with the colbaltate on letter c of the same question!
by ariana_apopei1K
Mon Dec 03, 2018 8:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Sapling practice?
Replies: 1
Views: 84

Sapling practice?

I have access to the online sapling stuff, but whenever I go look for the practice problems Dr Lavelle was talking about in lecture some time ago, all I have listed are some training modules on how to draw shapes using the sapling system and some practice math problems. Does anyone know where the pr...
by ariana_apopei1K
Mon Dec 03, 2018 8:11 pm
Forum: Naming
Topic: Ligand Names
Replies: 2
Views: 73

Re: Ligand Names

I don't know for sure but if we can just work out the lewis structures and use the formal charges from there for the ligands, then we technically don't have to memorize them. I do think knowing a few of the common ones by heart might be helpful though so you can have more time for other things on th...
by ariana_apopei1K
Thu Nov 29, 2018 9:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Step Up Session Worksheet (Monday + Friday, Hannah) [ENDORSED]
Replies: 37
Views: 1662

Re: Step Up Session Worksheet (Monday + Friday, Hannah) [ENDORSED]

You said that in order for hydrogen bonding to occur, the hydrogen in the individual molecule has to be bound to either O,N, or F to hydrogen bond with another molecule, but in CH3CH2OCH2CH3, none of the hydrogens are actually bound to the oxygen, but in number 3 d. of this worksheet, it says that ...
by ariana_apopei1K
Thu Nov 29, 2018 9:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Step Up Session Worksheet (Monday + Friday, Hannah) [ENDORSED]
Replies: 37
Views: 1662

Re: Step Up Session Worksheet (Monday + Friday, Hannah) [ENDORSED]

You said that in order for hydrogen bonding to occur, the hydrogen in the individual molecule has to be bound to either O,N, or F to hydrogen bond with another molecule, but in CH3CH2OCH2CH3, none of the hydrogens are actually bound to the oxygen, but in number 3 d. of this worksheet, it says that ...
by ariana_apopei1K
Thu Nov 29, 2018 7:36 pm
Forum: Administrative Questions and Class Announcements
Topic: Step Up Session Worksheet (Monday + Friday, Hannah) [ENDORSED]
Replies: 37
Views: 1662

Re: Step Up Session Worksheet (Monday + Friday, Hannah) [ENDORSED]

On the Week 6 Step-Up, why is #1a. only dipole-dipole and dispersion forces? Isn't there hydrogen bonding also between the hydrogen of one CH3CF3 and the fluorine of another CH3CF3 molecule? No, the H in the individual molecule must have hydrogen bonded to N, O, or F first for the interaction youre...
by ariana_apopei1K
Wed Nov 28, 2018 4:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarizability
Replies: 2
Views: 81

Re: Polarizability

Generally polarizability refers to the ease with which an e- cloud of a particle can be distorted. Polarizing power though, is the ability something has to distort said e- cloud. A smaller atom will have less polarizability, I think because the actual clouds are smaller and the e- are held more tigh...
by ariana_apopei1K
Wed Nov 28, 2018 4:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Exam topic
Replies: 1
Views: 32

Re: Exam topic

Yes, try to know the shapes along with their formula (like AX2E, etc) and what the bond angles are. I made a chart ranging from linear to octahedral and it helped me visualize it better. There are also illustrations in the book and online!
by ariana_apopei1K
Wed Nov 28, 2018 4:15 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: 3F.1 (Seventh Edition)
Replies: 2
Views: 81

Re: 3F.1 (Seventh Edition)

It has London dispersion forces becasuse they are interactions that happen for all examples that you'll be given. They're slightly negative parts of molecules that occur by chance as e- are constantly moving and may group up for shorts periods of times, causing dispersion. This is weak and temporary...
by ariana_apopei1K
Mon Nov 19, 2018 7:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma vs. Pi Bonds (What's the difference?)
Replies: 4
Views: 78

Re: Sigma vs. Pi Bonds (What's the difference?)

Hi! So it important to know a major difference bw them is that σ bonds allow for rotation because of cylindrical symmetry, whereas pi bonds are side-by-side interactions that do not allow rotation, or else the bond would break. When there are pi bonds, that restriction in movement means there are no...
by ariana_apopei1K
Mon Nov 19, 2018 7:03 pm
Forum: Hybridization
Topic: Unhybridized orbitals
Replies: 10
Views: 245

Re: Unhybridized orbitals

I was also a little confused about this today. I think it might have something to do with empty orbitals? Like the empty 2p orbital for his C2H4 example.
by ariana_apopei1K
Mon Nov 19, 2018 7:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular geometry vs Electronicgeometry
Replies: 3
Views: 74

Re: Molecular geometry vs Electronicgeometry

What is the difference between molecular geometry vs electronicgeometry? Electronic geometry describes the shape of a molecule based on the number and arrangement of electron pairs around a central atom. Molecular geometry is describing the shape of the molecule in terms of bonds. So if a molecule ...
by ariana_apopei1K
Sat Nov 17, 2018 5:14 pm
Forum: Administrative Questions and Class Announcements
Topic: Step Up Session Worksheet (Monday + Friday, Hannah) [ENDORSED]
Replies: 37
Views: 1662

Re: Step Up Session Worksheet (Monday + Friday, Hannah) [ENDORSED]

Can someone explain how to draw KrF4 You put Kr as the central atom and arrange F around it, then count that there are 36 total e- to use. Subtract 4 single bonds, giving you 28 e. Once you give all the F their octet, you're left with 4 extra e-. Fluorine does not allow for expanded octets, so the ...
by ariana_apopei1K
Tue Nov 13, 2018 6:00 pm
Forum: Electronegativity
Topic: Electronegativity Values
Replies: 2
Views: 83

Re: Electronegativity Values

I think you can generally find the answers to those kinds of questions by using the trend we learned, but there's a diagram listing some of the specific numbers on pg 97 (fig. 2d.2 at the top of the page). I doubt they'd give us any questionable comparisons to make where the specific numbers would b...
by ariana_apopei1K
Tue Nov 13, 2018 8:07 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Examples of intermolecular forces
Replies: 2
Views: 72

Re: Examples of intermolecular forces

Overall dispersion/van der waal forces occur among all molecules, but they're weak and only happen by chance. Hydrogen bonds are much stronger although more specific in nature. I don't think we'll need to memorize any particular example (although H2O is an easy one to remember for hydrogen bonds) bu...
by ariana_apopei1K
Tue Nov 13, 2018 7:59 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Axial vs. Equatorial Lone Pairs
Replies: 2
Views: 63

Re: Axial vs. Equatorial Lone Pairs

Ethan Breaux 1J wrote:When was this discussed in lecture?

I don't think it was discussed yet, but I found this from a different quarter if it's any help! viewtopic.php?t=16454
by ariana_apopei1K
Tue Nov 13, 2018 7:50 am
Forum: Administrative Questions and Class Announcements
Topic: 14B structure? [ENDORSED]
Replies: 2
Views: 112

14B structure? [ENDORSED]

Hi all,
Does anyone know if Dr. Lavelle structures chem 14b similarly to 14a? Meaning if there are still lots of available resources like the workshops and all that? I know chem community is still available to us but I was just curious!
by ariana_apopei1K
Mon Nov 05, 2018 11:45 am
Forum: Trends in The Periodic Table
Topic: Problem 1F.11 (7th Edition)
Replies: 3
Views: 99

Re: Problem 1F.11 (7th Edition)

Also I found this for why Mg and Be are equal. Their 2s orbitals are full, making them very stable. Adding an e- would create an awkward arrangement that it does not prefer over having a full subshell. Nitrogen also has a very low affinity because its 2p orbital is half full, meaning more stable.
by ariana_apopei1K
Mon Nov 05, 2018 11:37 am
Forum: Trends in The Periodic Table
Topic: Problem 1F.11 (7th Edition)
Replies: 3
Views: 99

Re: Problem 1F.11 (7th Edition)

Hi I also had trouble with this and looked around online for some answers. I think it's because Oxygen is smaller than Sulfur, and has higher electron repulsion. This repulsion makes less energy be released when an e- is added, since it is being made even less stable. I guess it't just an overall ex...
by ariana_apopei1K
Mon Nov 05, 2018 11:27 am
Forum: Trends in The Periodic Table
Topic: ionization energy & electron affinity
Replies: 3
Views: 115

Re: ionization energy & electron affinity

They have the same trend on the table too, increase as you go from left to right and decrease as you go from top to bottom.
by ariana_apopei1K
Mon Nov 05, 2018 11:25 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Test 2 Alveoli question
Replies: 5
Views: 276

Re: Test 2 Alveoli question

Anjali 4A wrote:Some questions give the radius instead of the diameter, in that case would we multiply the radius by 2?

I think that's correct yeah!
by ariana_apopei1K
Mon Nov 05, 2018 11:23 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: When to multiply by 2
Replies: 5
Views: 353

Re: When to multiply by 2

You would multiply by 2 when you're given something like +/-0.5 as your value. This uses the same reasoning as the first answer on this post, the two outermost values we can get are .5 and -.5, so when you subtract them (.5--.5) you get 1, the same thing as multiplying .5 times 2.
by ariana_apopei1K
Mon Nov 05, 2018 9:30 am
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 28899

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Thank you! For 6.b. isn't it asking for the work energy/ the threshold energy? In the solution, E=hv is used to find energy, but I thought that was energy of the incoming photon and it's asking how much energy is required to remove the electron. So wouldn't you find the kinetic energy of the photon...
by ariana_apopei1K
Sun Nov 04, 2018 7:09 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Test 2 Alveoli question
Replies: 5
Views: 276

Re: Test 2 Alveoli question

Alexa_Henrie_3B wrote:Yes the position in question 1 is just the diameter, 2x10^-4 m.

Perfect, thank you!
by ariana_apopei1K
Sun Nov 04, 2018 6:55 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Test 2 Alveoli question
Replies: 5
Views: 276

Test 2 Alveoli question

Hi everyone! I would love some quick clarification on question 1 from test 2: anytime we are given the diameter in this type of question we substitute it directly in for delta x? As in no manipulations or using formulas, the diameter covers the potential position for the molecule? Thanks and good lu...
by ariana_apopei1K
Sun Nov 04, 2018 2:02 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 28899

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Heyy I was wondering where I can find the answers for worksheet 5 (newest one)? Also for question 9 aren't there more than 2 ions that aren't isoelectronic with F-. I got 4 ions (Li+, Be2+,O-, N2-) that aren't isoelectronic. Thanks! I also got this as my answer! I think the answer sheet will be pos...
by ariana_apopei1K
Thu Nov 01, 2018 9:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Selling textbook?
Replies: 2
Views: 109

Re: Selling textbook?

I'm sure someone would buy, if not the entire set, one or two parts of it! You wouldn't get all your money back, but people next quarter could definitely use it and would prefer to purchase it if it is a lower price. Sorry if that isn't much help! Best of luck to you :) Thank you! I'll try it out a...
by ariana_apopei1K
Thu Nov 01, 2018 9:20 pm
Forum: Resonance Structures
Topic: 2C.5 (7th ed)
Replies: 3
Views: 77

Re: 2C.5 (7th ed)

Leela_Mohan3L wrote:O has an even amount of valence electrons (6) while Cl has an odd amount of valence electrons (7). Thus, Cl is the radical since it has an odd amount of valence electrons.

That's so much easier than I thought it would be haha, thanks!!
by ariana_apopei1K
Thu Nov 01, 2018 6:49 pm
Forum: Resonance Structures
Topic: 2C.5 (7th ed)
Replies: 3
Views: 77

2C.5 (7th ed)

Hi all, part a asks for the lewis structure of ClO, and i understand it's a radical, but how did they determine that the single electron goes on Cl and not O? Does it have to do with electronegativity or something from the trends? Thanks
by ariana_apopei1K
Tue Oct 30, 2018 1:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Selling textbook?
Replies: 2
Views: 109

Selling textbook?

Hi everyone, I hope midterm season isn't too bad so far! I accidentally bought the e-text, loose leaf text, and solutions manual twice toward the beginning of the year. The return period just expired a couple days ago, and I was wondering if anyone had any specific advice on how I should go about tr...
by ariana_apopei1K
Mon Oct 29, 2018 7:04 pm
Forum: Trends in The Periodic Table
Topic: Lewis Structures
Replies: 7
Views: 162

Re: Lewis Structures

The dots can go on any four sides, but keep in mind that two dots next to each other means that those two electrons are paired. If the 4 electrons that you're drawing aren't paired, the structure would have one dot on each of the 4 sides. I have a similar question from this: A line drawn between tw...
by ariana_apopei1K
Mon Oct 29, 2018 6:58 pm
Forum: Administrative Questions and Class Announcements
Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Replies: 121
Views: 5542

Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]

Chan Mee Lee wrote:Hi, is the review session in Young Hall where our lectures are or is it CS24?

Hey, the session is in CS24, which is the same place where the 2 pm lecture is held. If yours is in CS50 it will be right next door!
by ariana_apopei1K
Thu Oct 25, 2018 9:29 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 28899

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

I'm a little confused on #7 in the Quantum World Part 1 worksheet. I just can't seem to come up with (1/ni)=0.0278 and I'm not sure why. Could someone explain it to me possibly? I follow her formulas and rationale, I'm just not getting the right numbers... I only get 0.0278 if I have 7.55x10^-20 be...
by ariana_apopei1K
Wed Oct 24, 2018 8:45 pm
Forum: DeBroglie Equation
Topic: Remembering mass of electrons for tests
Replies: 6
Views: 156

Re: Remembering mass of electrons for tests

The same paper that's given to us each test is on Lavelle's website for the class if you want to see the specific things we are given to use without memorizing. I think it's called "constants and equations" or something along those lines
by ariana_apopei1K
Wed Oct 24, 2018 8:37 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 28899

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Imelda Mena 1J wrote:Hi! Where do these workshops take place? I would like to attend.

Covel 210
by ariana_apopei1K
Tue Oct 23, 2018 1:52 pm
Forum: Properties of Electrons
Topic: Test question
Replies: 6
Views: 229

Re: Test question

Does anyone know what information will be given to us...in terms of formulas and what not. Do we need to know the mass of an electron? Hi, everything that is given to us is in the "constants and equations" file on the 14a website! Mass of an electron is included in the list of things give...
by ariana_apopei1K
Mon Oct 22, 2018 8:29 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 28899

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

For Quantum World Part 2 Worksheet, why is 11 D False? I saw it as a trick question with the "always" because higher frequency doesn't matter until the threshold wavelength is reached for the photoelectric experiment. After that, it does matter, but since the wavelength doesn't always rea...
by ariana_apopei1K
Sun Oct 21, 2018 5:44 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 16
Views: 216

Re: Work Function

Also, I am a little confused on what it means when the electron is ejected from the metal. Like is it light? Like what is the purpose of the electron being ejected? It has to do with the experiment we discussed in class where light (photons) hit a block of metal, leading to the e- being ejected. Th...
by ariana_apopei1K
Wed Oct 17, 2018 5:29 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: What the equation is used for
Replies: 5
Views: 106

Re: What the equation is used for

I think it's overall stating that we can't be sure of the speed or position of an object at the same time. If we stop an object to get its position, then we cannot know its speed and vice versa. This video really helped me understand the concept more in terms of wavelengths and what we're learning a...
by ariana_apopei1K
Wed Oct 17, 2018 5:23 pm
Forum: Properties of Light
Topic: Series
Replies: 4
Views: 103

Re: Series

I would just know that Ballmer includes visible light, whereas Lymann includes UV, and that Ballmer starts at n=2 and Lymann starts at n=1. Otherwise the questions will probably include anything more specific that we need to know.
by ariana_apopei1K
Wed Oct 17, 2018 5:19 pm
Forum: Properties of Light
Topic: energy equation
Replies: 4
Views: 73

Re: energy equation

I think it depends on what the question already gives you data-wise. If one of the equations isn't possible to use because a specific data point isn't given, then switch to the other and see from there.
by ariana_apopei1K
Tue Oct 09, 2018 9:18 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity
Replies: 4
Views: 325

Re: Molarity

Hi, I thought of the 150ml solution as a sort of starting point for the person doing the dilution. They would use this to get their first "sample" of 20mL. So try using 20mL as your V1!
by ariana_apopei1K
Tue Oct 09, 2018 9:07 pm
Forum: SI Units, Unit Conversions
Topic: Homework for Week 2
Replies: 16
Views: 326

Re: Homework for Week 2

I think Dr. Lavelle mentioned in my lecture that since we are still practicing the fundamentals to prepare for the first exam we can pull HW2 problems from the fundamental section of questions! He said HW in general is pretty flexible.
by ariana_apopei1K
Tue Oct 09, 2018 7:43 pm
Forum: Balancing Chemical Reactions
Topic: Percent Yield
Replies: 5
Views: 206

Re: Percent Yield

Probably, since it's part of the review from HS. Only a couple extra steps anyways, I'd know it just in case!!
by ariana_apopei1K
Thu Oct 04, 2018 5:18 pm
Forum: Balancing Chemical Reactions
Topic: Extensive v. Intensive Property [ENDORSED]
Replies: 6
Views: 312

Re: Extensive v. Intensive Property [ENDORSED]

I see extensive as something that can "change", such as the volume of a cardboard box. A bigger cardboard box could hold more water than a smaller one, and thus has a larger volume--this difference between the two means volume is an extensive trait. Intensive is when it's an intrinsic part...
by ariana_apopei1K
Thu Oct 04, 2018 5:10 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Ed. 7 E.23D Equation
Replies: 3
Views: 72

Re: Ed. 7 E.23D Equation

Essentially, I don't think it changes how you get to the solution btw! Same as the previous parts of the problem.

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