Search found 47 matches

by 1K Kevin
Sun Mar 17, 2019 12:08 am
Forum: Balancing Redox Reactions
Topic: calculating standard cell potential
Replies: 5
Views: 36

Re: calculating standard cell potential

YES this finally made sense to me now thank thank you so much! i could never tell when to flip or not thank you!
by 1K Kevin
Sat Mar 09, 2019 5:27 pm
Forum: Second Order Reactions
Topic: Final
Replies: 30
Views: 302

Re: Final

Final will be on all material throughout the quarter, TA said that it will probably be around 8 questions, some may have multiple parts, and you can expect at least 1 question from each topic. Online Lavelle also states that "Questions will come from the Homework and Online Assessments" ho...
by 1K Kevin
Sat Mar 09, 2019 5:23 pm
Forum: Administrative Questions and Class Announcements
Topic: Today's Review Session (Sat 12-2)
Replies: 1
Views: 57

Re: Today's Review Session (Sat 12-2)

I believe he said that he will post the problems and answers later tonight! As for other notes he did: he went over the equations we will need to use (all of which can be found on the equations sheet) and gave more detail of when to use each
by 1K Kevin
Sun Mar 03, 2019 7:30 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: 6N.15 7th Ed
Replies: 1
Views: 53

6N.15 7th Ed

"Calculate the potential of a cell constructed with two nickel electrodes. The electrolyte in one compartment is 1.0 M Ni(NO3)2. In the other compartment, NaOH has been added to a Ni(NO3)2 solution until the pH = 11 at 298 K. Use Table 6I.1" The problem is uses the Nernst Equation but Im c...
by 1K Kevin
Sat Mar 02, 2019 1:21 pm
Forum: Balancing Redox Reactions
Topic: Creating a cell diagram
Replies: 8
Views: 75

Re: Creating a cell diagram

As far as I know you do not include H2O since it is a pure liquid while you would include H+ or OH- since those are aqueous solutions
by 1K Kevin
Sat Feb 23, 2019 7:19 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: test 3
Replies: 10
Views: 97

Re: test 3

Yup from Gibbs free energy to but not including the Nernst Equation. I was told it will probably have 8 questions and be half thermodynamics and half electrochemistry but that might not be exact ¯\_(ツ)_/¯
by 1K Kevin
Fri Feb 22, 2019 6:56 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cathode vs. Anode
Replies: 9
Views: 70

Re: Cathode vs. Anode

The cathode is the reduced half-reaction as seen in how it gains electrons in the process. The anode is oxidized in its half-reaction as seen in how it loses electrons in the process.
by 1K Kevin
Fri Feb 22, 2019 6:44 pm
Forum: Balancing Redox Reactions
Topic: Test 2 Material
Replies: 11
Views: 116

Re: Test 2 Material

I was told all content from weeks 6 and 7 and since the midterm was week 6 wednesday we only have friday week 6 and week 7
by 1K Kevin
Wed Feb 13, 2019 4:13 pm
Forum: General Science Questions
Topic: Midterm Formulas
Replies: 6
Views: 117

Re: Midterm Formulas

I can't really say everything that won't be given on the midterm but this is all the equations and constants he will give us, plus he said to give us constants specific to the problems. You might have to use variations of these equations but hope this helps! https://lavelle.chem.ucla.edu/wp-content/...
by 1K Kevin
Tue Feb 12, 2019 7:37 pm
Forum: Phase Changes & Related Calculations
Topic: Heat Release from ice (0C) to water (20C)
Replies: 4
Views: 1920

Re: Heat Release from ice (0C) to water (20C)

The one that starts with 6 is 6.01 kJ*mol^-1. This is per mole and the one Lavelle used is per gram and isn't given to us on the constant sheet. The two options here are to remember and use that one for this problem or convert the grams of ice to moles and use the 6.01kJ/mol (If you convert to moles...
by 1K Kevin
Sun Feb 10, 2019 10:19 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Lecture notes 2/8/19
Replies: 3
Views: 60

Re: Lecture notes 2/8/19

Yooo this is super useful thank you thank you
by 1K Kevin
Sun Feb 10, 2019 9:20 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Study Guides
Replies: 15
Views: 244

Re: Study Guides

Not sure but if you go the step-up/workshop sessions you can probably get some more focused worksheets
by 1K Kevin
Tue Feb 05, 2019 3:32 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 4.D.11 (7th ed)
Replies: 2
Views: 44

4.D.11 (7th ed)

Part b asks "How much heat is absorbed in the oxidation of 5.45L of nitrogen measured at 1 atm and 273k?" The only thing I can think of is to use the ideal gas law because we have p v and t but that gives the the moles and where do we go from there?
by 1K Kevin
Sun Feb 03, 2019 10:10 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Adiabatic
Replies: 4
Views: 48

Re: Adiabatic

Adiabatic is a quick process that does not allows for heat transfer, but the temperature pressure and volume can all change. All change in energy would be from Work.
by 1K Kevin
Sun Feb 03, 2019 10:04 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Isochoric
Replies: 4
Views: 39

Re: Isochoric

The volume is held constant, on a PV diagram it would a vertical line meaning the pressure and temperature can change. Since it is a vertical line there is no work being done and the change in internal energy is all heat.
by 1K Kevin
Sun Feb 03, 2019 9:55 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Isobaric
Replies: 2
Views: 28

Re: Isobaric

The pressure is constant. On a Pressure-Volume Diagram the line would be a horizontal line
by 1K Kevin
Sun Jan 27, 2019 10:05 pm
Forum: Administrative Questions and Class Announcements
Topic: Lecture Slides
Replies: 5
Views: 77

Re: Lecture Slides

No he doesn't. You could get the notes from someone and I'm sure he could clear up any confusions you still have in like office hours or something :)
by 1K Kevin
Sun Jan 27, 2019 10:01 pm
Forum: Phase Changes & Related Calculations
Topic: State functions
Replies: 2
Views: 31

Re: State functions

Work is not a state function because its current state depends on things preceding it. The example in the book is two experiments, one where a gas expands pushing a piston which pushes against water; work is done here because there is an external force. The second has a gas push a piston into a vacu...
by 1K Kevin
Sun Jan 27, 2019 9:46 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: closed vs isolated
Replies: 14
Views: 156

Re: closed vs isolated

A closed system has a fixed amount of matter but can exchange energy with the surroundings/environment. In an isolated system the system can't exchange matter or energy with the surroundings.
by 1K Kevin
Thu Jan 17, 2019 10:41 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pKa and pKb
Replies: 4
Views: 179

pKa and pKb

I'm getting a bit confused but what does a high pKa mean in comparison to a low pKa, and same with pKb. I know that a low pKa means a high pKb but would that be a stronger acid/weak base or a stronger base/weak acid.
by 1K Kevin
Wed Jan 16, 2019 7:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ice table coefficients [ENDORSED]
Replies: 6
Views: 90

Re: Ice table coefficients [ENDORSED]

If you look on the example 5I.3 7th ed on p.419-420 you see in the change portion of the ICE that there can be a +2x or -2x. These come from the stoichiometric coefficients of the chemical equations
by 1K Kevin
Tue Jan 15, 2019 3:08 pm
Forum: General Science Questions
Topic: Autoprotolysis
Replies: 3
Views: 84

Re: Autoprotolysis

Autoprotolysis is the proton transfer between the same type of molecule. In the case of water it favors being 2H2O rather than being H3O+ and OH-. This leads to autoprotolysis for water at 25 C being 1*10^-14 with H3O and OH being equal
by 1K Kevin
Sun Dec 09, 2018 7:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Grade View
Replies: 7
Views: 194

Re: Final Grade View

For the midterm it took them like a week so I assume that it will be posted around Next Sunday
Good luck with finals! :D
by 1K Kevin
Tue Dec 04, 2018 5:26 pm
Forum: Student Social/Study Group
Topic: Tuesday Review Session
Replies: 1
Views: 51

Tuesday Review Session

Does anyone have any notes they can share for the review session that was on Tuesday 12:30-2 pm with Daniel, wasn't able to go because of work so thank you very much!
by 1K Kevin
Sat Dec 01, 2018 11:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 200
Views: 44238

Re: Saying Thank You to Dr. Lavelle

Dr. Lavelle i just want to say that having chemistry community has been a huge help in helping me succeed. Some topics have been harder than others but having this resource always with me is a huge help.
by 1K Kevin
Sat Dec 01, 2018 11:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 5
Views: 104

Re: Final

The last day of instruction will be Friday of week 10 but the last day of new material will be Wednesday week 10. Friday will be a review session during class like how it was for the midterm
by 1K Kevin
Sat Nov 24, 2018 12:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 3
Replies: 10
Views: 163

Re: Test 3

Brushing up on Outline 3 would't hurt since its on the test still.
by 1K Kevin
Tue Nov 20, 2018 3:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving Wednesday Class
Replies: 19
Views: 308

Re: Thanksgiving Wednesday Class

just came to say WOOOO NO CLASS WEDNESDAY!
by 1K Kevin
Sun Nov 18, 2018 3:11 pm
Forum: Student Social/Study Group
Topic: Studying for tests/midterm
Replies: 18
Views: 905

Re: Studying for tests/midterm

I challenge myself to do the harder homework problems and when I can't solve one I look at notes and online videos for that section
by 1K Kevin
Sun Nov 18, 2018 3:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Angular vs. Bent
Replies: 7
Views: 1015

Re: Angular vs. Bent

They can be used in the same context, but specifically I believe bent is for when the general shape is distorted by lone pairs
by 1K Kevin
Sun Nov 18, 2018 3:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 3
Replies: 19
Views: 244

Re: Test 3

I think memorizing them would help especially knowing the bond angles for the each one.
by 1K Kevin
Sun Nov 11, 2018 5:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework Due Week 7
Replies: 10
Views: 197

Re: Homework Due Week 7

Ya! We didn't really cover too much of outline 4 yet so Outline 3 stuff would be fine. Plus its always extra practice for the final
by 1K Kevin
Mon Nov 05, 2018 2:31 pm
Forum: Administrative Questions and Class Announcements
Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Replies: 121
Views: 4564

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

Can anyone help explain the process for 11a
Thank You!
by 1K Kevin
Sat Nov 03, 2018 5:25 pm
Forum: Octet Exceptions
Topic: Octet exceptions
Replies: 8
Views: 155

Octet exceptions

Hi,
Elements that are in period 3 and up can have expanded shells that hold more than 8 but will they always have more or when can they?
by 1K Kevin
Sat Nov 03, 2018 5:04 pm
Forum: *Particle in a Box
Topic: Midterm
Replies: 14
Views: 516

Re: Midterm

Under what tab is last year's midterm in ccle?
by 1K Kevin
Tue Oct 23, 2018 7:09 pm
Forum: Photoelectric Effect
Topic: Question 1.B.15 7th
Replies: 2
Views: 73

Question 1.B.15 7th

Can someone help me with part A. Its given "the velocity of an electron is emitted from a metal surface by a photon is 3.6 x 10^3 km * s^-1 and are trying to find the wavelength of the ejected electron" Im having a hard time figuring out what equations to use or the steps to solving it. Th...
by 1K Kevin
Fri Oct 19, 2018 5:43 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 7
Views: 136

Re: Rydberg Equation

Thank you!! These were extremely helpful clarifying!
by 1K Kevin
Fri Oct 19, 2018 5:38 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem Community Due Date
Replies: 6
Views: 142

Re: Chem Community Due Date

I've heard many days but I'm sticking to Sunday which I heard the most. So long as you do 3 a week you should be fine :)
by 1K Kevin
Fri Oct 19, 2018 1:21 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 7
Views: 136

Rydberg Equation

Can someone explain when I should use the equation v = R * ( 1/n1^2 - 1/n2^2) and how does this relate to energy and the atomic spectra
by 1K Kevin
Fri Oct 12, 2018 10:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 96
Views: 29369

Re: Advice from a Medical Student [ENDORSED]

This is some reassuring stuff, Thanks!
by 1K Kevin
Fri Oct 12, 2018 9:52 pm
Forum: DeBroglie Equation
Topic: Equations
Replies: 9
Views: 85

Re: Equations

We'll be given one form of equations so you'll need to be able to switch it up for what you need. We'll also have all the constants like c h R and a periodic table
by 1K Kevin
Fri Oct 12, 2018 9:41 pm
Forum: Properties of Light
Topic: question from class today
Replies: 3
Views: 29

Re: question from class today

The units of the numerator are J *S which is (kg*m^2*S^-2) *S
The denominator for it is (kg)*(m*S^-1) If you move the s^-1 to the numerator (1/s^-1 = s^1/1) the you get s^2 *s^-2 which will cancel the seconds and the kilograms
by 1K Kevin
Sat Oct 06, 2018 4:45 pm
Forum: SI Units, Unit Conversions
Topic: Modules?
Replies: 8
Views: 112

Modules?

Is there a specific due date for the first 4 modules or are they just help for our test.
by 1K Kevin
Sat Oct 06, 2018 4:14 pm
Forum: SI Units, Unit Conversions
Topic: Chemistry Community Points
Replies: 3
Views: 51

Re: Chemistry Community Points

I believe that those would count since the first turn in isn't until Sunday so everything before that should count.
by 1K Kevin
Sat Oct 06, 2018 3:50 pm
Forum: Significant Figures
Topic: Sig Figs: Addition and Subtraction
Replies: 3
Views: 116

Re: Sig Figs: Addition and Subtraction

Addition and subtraction takes the Least significant figures after the decimal point. In this case, I think that one of the reasons is that you can't accurately say that the answer is 123456.608 because the .6 means that you estimated the measurement to .5 through .7 (or +/- .1). So if you keep the ...

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