Search found 50 matches

by Kate Swertfager
Wed Mar 11, 2020 4:57 pm
Forum: Administrative Questions and Class Announcements
Topic: final
Replies: 14
Views: 251

Re: final

I think we are all waiting for the same answers! Professor Lavelle said he would get back to us with more information soon! I think the answers will come when he sends another email.
by Kate Swertfager
Tue Mar 10, 2020 4:38 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Review Sessions
Replies: 2
Views: 61

Re: Review Sessions

I think Dr. Lavelle will send a clarifying email soon.
by Kate Swertfager
Mon Mar 09, 2020 11:19 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow step
Replies: 7
Views: 77

Slow step

Will we be given the intermediate reactions? Or should we be able to tell from the original reaction? Also how do we tell which intermediate reaction is the slow one?
by Kate Swertfager
Mon Mar 09, 2020 6:33 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell diagram
Replies: 7
Views: 94

Re: Cell diagram

Use the vertical line! Also make sure to add in the inert metal on both ends separated with another vertical line.
by Kate Swertfager
Mon Mar 09, 2020 6:32 am
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 2
Views: 50

Final

Do Lavelle’s 14B finals usually take the whole 3 hours to finish?
by Kate Swertfager
Mon Mar 09, 2020 5:32 am
Forum: Administrative Questions and Class Announcements
Topic: Review session on Friday
Replies: 3
Views: 65

Review session on Friday

Will the review session Friday 6-9 be Bruin casted?
by Kate Swertfager
Wed Mar 04, 2020 11:11 am
Forum: Administrative Questions and Class Announcements
Topic: Excellence in Chemistry Award!
Replies: 27
Views: 6861

Re: Excellence in Chemistry Award!

[img]IMG_1899.jpeg[/img]
by Kate Swertfager
Sun Mar 01, 2020 8:19 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst Equation
Replies: 3
Views: 50

Re: Nernst Equation

start with the two different delta G equations. Set them equal to each other and solve for E. then separately Solve the delta G equation(the one with Estandard) for Estandard. youll then notice you can plug that into the equation you got for E. Also change p/r to q. That is the derivation of Nerst.
by Kate Swertfager
Sun Mar 01, 2020 7:58 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: cell diagrams
Replies: 8
Views: 113

Re: cell diagrams

on page 550 of the book there is an example where the cathode and anode have flipped sides in the diagram. In class I believe Dr. Lavelle said to look at which one is being reduced and which one is being oxidized and that will tell you which one is the anode/cathode.
by Kate Swertfager
Fri Feb 28, 2020 8:05 pm
Forum: First Order Reactions
Topic: Slopes of a plot
Replies: 7
Views: 717

Re: Slopes of a plot

Yes the graph of the first order has a negative slope. The slope is -k and since k is always positive the slope is always negative for 1st order.
by Kate Swertfager
Fri Feb 28, 2020 8:01 pm
Forum: General Rate Laws
Topic: Overall reaction order
Replies: 4
Views: 76

Overall reaction order

What do you set rate 1/rate 2 equal to when trying to find m or n. In the example from class, they set it equal to 2 so that it was 2^m= 2 and m was just 1. I’m confused how to know what to set 2^m equal to.
by Kate Swertfager
Fri Feb 28, 2020 7:45 pm
Forum: General Rate Laws
Topic: Deriving the laws
Replies: 5
Views: 83

Deriving the laws

Each time we use the different laws, are we supposed to derive them from the start or are we allowed to plug and chug?
by Kate Swertfager
Mon Feb 24, 2020 11:12 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Test 2
Replies: 13
Views: 119

Re: Test 2

Second page of the thermodynamics outline and all of the electrochemistry outline.
by Kate Swertfager
Mon Feb 24, 2020 11:10 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: midterm
Replies: 5
Views: 89

Re: midterm

Can we go to any TA for our own?
by Kate Swertfager
Fri Feb 21, 2020 12:01 pm
Forum: General Science Questions
Topic: What are Workshops?
Replies: 10
Views: 345

Re: What are Workshops?

Are step up sessions worth the time? I need help but I don’t have a lot of free time to go to a session that might just be the exact thing from class.
by Kate Swertfager
Fri Feb 21, 2020 12:00 pm
Forum: Balancing Redox Reactions
Topic: Oxidation numbers
Replies: 6
Views: 105

Re: Oxidation numbers

Are all diatomic molecules neutral charge?
by Kate Swertfager
Fri Feb 21, 2020 11:59 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Standards
Replies: 2
Views: 53

Standards

What makes something a standard quality? When do I know to use standard vs not standard?
by Kate Swertfager
Wed Feb 19, 2020 7:51 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: midterm 3C
Replies: 4
Views: 72

Re: midterm 3C

Yes! Bcs NH4CL dissociates, it produces more NH4 which is acidic. Having more of an acid will ultimately decrease the pH even if it’s a weak acid.
by Kate Swertfager
Wed Feb 19, 2020 7:45 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Reversible Reaction
Replies: 6
Views: 164

Re: Reversible Reaction

Most of the questions I’ve come across have stated that the process was reversible or nonreversible. Reversible reactions must be at constant temp as well and that’s why we use the equations for w that includes T not delta T.
by Kate Swertfager
Wed Feb 19, 2020 7:40 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: E as intensive property
Replies: 5
Views: 63

Re: E as intensive property

I think intensive means that the voltage difference doesn’t depend on the amount of times that the voltage occurs??
by Kate Swertfager
Wed Feb 19, 2020 7:35 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpies of formation
Replies: 2
Views: 68

Re: Enthalpies of formation

Is it because it releases more energy to form bonds than it takes to break bonds? Resulting in a larger negative value?
by Kate Swertfager
Wed Feb 19, 2020 7:32 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: midterm Q1A
Replies: 7
Views: 80

Re: midterm Q1A

Since it is an exothermkc reaction, heat is a product and therefore heating up the reaction would add product, shifting the reaction equilibrium to the left towards the reactants.
by Kate Swertfager
Wed Feb 19, 2020 7:29 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 2
Views: 30

Re: Salt Bridge

^^How does a salt bring deliver those charges? I can’t understand what a salt bridge physically is.
by Kate Swertfager
Sat Feb 08, 2020 3:29 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Calculating bond enthalpies
Replies: 4
Views: 36

Re: Calculating bond enthalpies

Its on the practice midterm so I would study up on it. There is a really good example in the text book.
by Kate Swertfager
Sat Feb 08, 2020 3:28 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Calculating bond enthalpies
Replies: 4
Views: 36

Re: Calculating bond enthalpies

Only multiply it by 3 if all three of the bonds are broken. IF two of the bonds are broken, then multiply that bond breakage by 2.
by Kate Swertfager
Sat Feb 08, 2020 12:18 pm
Forum: General Science Questions
Topic: Midterm
Replies: 17
Views: 421

Re: Midterm

How similar will this practice test be to the actual midterm?
by Kate Swertfager
Fri Feb 07, 2020 8:30 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Equations
Replies: 3
Views: 40

Re: Equations

I think the best way to remember them is to separate the equations into groups of categories\learning objectives and then by what is constant in the equations. The way they are separated in class notes make it easier so I would try making a study guide from that. rewriting the equations and when you...
by Kate Swertfager
Fri Feb 07, 2020 8:26 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated vs Closed [ENDORSED]
Replies: 34
Views: 830

Re: Isolated vs Closed [ENDORSED]

If the system doesn’t exchange energy(heat) or matter then it is isolated. If it exchanges Energy(heat) but not matter then it is closed. If it exchanges both then it is open.
An isolated water bottle doesn’t exchange heat with surroundings or matter so it is isolated.
by Kate Swertfager
Fri Feb 07, 2020 8:25 pm
Forum: Calculating Work of Expansion
Topic: Units for Work
Replies: 5
Views: 39

Re: Units for Work

The SI units for pressure are Pascals and for V they are m^3. For work it is Joules so I think Pa times m^3 gives J.
by Kate Swertfager
Sun Feb 02, 2020 6:16 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Variables
Replies: 3
Views: 49

Re: Variables

I was talking to a past student and they said that you should familiar yourself with the variables and equation sheet prior to the test. You will have a lot of equations in front of you but it’s important to know which equation and variables to use!
by Kate Swertfager
Sun Feb 02, 2020 6:12 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calorimeter
Replies: 5
Views: 55

Re: Calorimeter

There are adiabatic calorimeters, oxygen bomb calorimeters, and differential scanning calorimeters (DSC). But in this class I’m pretty sure we focus on bomb calorimeters.
by Kate Swertfager
Sun Feb 02, 2020 6:10 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4A.13
Replies: 3
Views: 28

Re: 4A.13

I think because the temp change between temp in K and temp in C is the same?
by Kate Swertfager
Sun Feb 02, 2020 6:09 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy of Rxn
Replies: 9
Views: 82

Re: Enthalpy of Rxn

Multiply. Also always look at the units for help. You need moles to cancel
by Kate Swertfager
Sun Feb 02, 2020 6:07 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Delta U vs Delta H
Replies: 4
Views: 38

Delta U vs Delta H

What’s the difference between the delta U and delta H? How do I know when to use which one?
by Kate Swertfager
Tue Jan 21, 2020 11:15 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Prepping for Test
Replies: 6
Views: 74

Re: Prepping for Test

I went to the test bank today to look for past exams but there were none! So I don;t suggest going there for help. 'Im going to stick with the homework problems and reviewing the learning outcomes.
by Kate Swertfager
Tue Jan 21, 2020 11:13 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Week 3 hmwrk problems
Replies: 2
Views: 22

Re: Week 3 hmwrk problems

Yes. Homework problems should be from relevant and current lessons from lecture and section. And since we have a test on the first two topics in sections this week, homework should be from those two topics!
by Kate Swertfager
Tue Jan 21, 2020 11:11 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximation
Replies: 6
Views: 47

Re: Approximation

It has to be smaller. Also check once you have your x value to make sure its less than 5% of the initial concentration,if it is then its a good approximation.
by Kate Swertfager
Mon Jan 20, 2020 11:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6d.1
Replies: 2
Views: 34

Re: 6d.1

There is a table in the book. However sometimes you will need the Ka but you only have the KB for the conjugate and you’ll have to use (Ka)(Kb)=Kw relationship to solve for what you need.
by Kate Swertfager
Mon Jan 20, 2020 11:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Test One-
Replies: 1
Views: 77

Test One-

Will topic 6G be covered on test one? It’s not on the syllabus but we discussed buffers in class.
by Kate Swertfager
Wed Jan 15, 2020 8:22 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Kw
Replies: 16
Views: 135

Re: Kw

Equilibrium constant and ionization constant of water are the same thing in this case.
by Kate Swertfager
Wed Jan 15, 2020 8:20 am
Forum: Administrative Questions and Class Announcements
Topic: Study Guide Test One
Replies: 17
Views: 204

Study Guide Test One

Will there be a study guide given for test one? Or even just a practice test?
by Kate Swertfager
Wed Jan 15, 2020 8:19 am
Forum: Administrative Questions and Class Announcements
Topic: Section 1D
Replies: 1
Views: 37

Section 1D

Was 1D’s section TA changed? My class is sitting in section that was supposed to start at 8am and no TA has shown up. It’s now 8:18. We don’t know what to do.
by Kate Swertfager
Wed Jan 15, 2020 8:15 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: What is K
Replies: 6
Views: 71

Re: What is K

I think of K as the blanket term for the equilibrium constant. Then more specifically we have Kc, Kp and Kw which are all slightly different but refer to the equilibrium constant as well.
by Kate Swertfager
Wed Jan 15, 2020 8:12 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Hw for next week
Replies: 19
Views: 212

Re: Hw for next week

On the syllabus, it states that we can do any 5 questions from relevant and current topics. So since we just moved in to acids and bases on Monday I would say we can also do questions from equilibrium.
by Kate Swertfager
Fri Jan 10, 2020 9:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Graphing K and Q Values
Replies: 4
Views: 51

Re: Graphing K and Q Values

In the textbook there is a small section describing graphs I believe. Not sure on the page numbers tho. So if it’s in the test it could possibly be tested. Maybe check the objectives and see if it’s there!
by Kate Swertfager
Fri Jan 10, 2020 9:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Week 1 lecture note
Replies: 4
Views: 92

Re: Week 1 lecture note

Thank you! Will these be posted every week?
by Kate Swertfager
Wed Jan 08, 2020 1:58 pm
Forum: Ideal Gases
Topic: Q and K
Replies: 7
Views: 73

Re: Q and K

K is used at equilibrium. Q can be used at any time during the reaction. You can find Q and then compare it to K. For instance is K=Q, then you know the reaction is at equilibrium.
by Kate Swertfager
Wed Jan 08, 2020 1:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 226
Views: 116437

Re: Advice from a Medical Student [ENDORSED]

Coming into the chemistry 14 series was kinda scary for me, since I’ve never taken chemistry before. But after discovering chemistry community and posts like this, I’m very reassured that even if I struggle with the course it will be worth it in the long run(like when I eventually take the mcat). ju...
by Kate Swertfager
Tue Jan 07, 2020 6:09 pm
Forum: Ideal Gases
Topic: Review Ideal Gases
Replies: 6
Views: 83

Re: Review Ideal Gases

Adding on to the previous answer with suggesting Khan Academy. They have great videos that flow in a logical and easy to remember way(for FREE). There is a whole section on ideal gases that includes review videos, mini quizzes and written text!

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