Search found 212 matches

by Kallista McCarty 1C
Thu Mar 12, 2020 9:10 am
Forum: Administrative Questions and Class Announcements
Topic: ENDGAME Review Session
Replies: 71
Views: 2522

Re: ENDGAME Review Session

Are the answers for this worksheet going to be posted soon?
by Kallista McCarty 1C
Thu Mar 12, 2020 8:21 am
Forum: Balancing Redox Reactions
Topic: Determining the oxidizer and reducer
Replies: 10
Views: 60

Re: Determining the oxidizer and reducer

The oxidizing agent is the one that is reduced and the reducing agent is the one that is oxidized!
by Kallista McCarty 1C
Thu Mar 12, 2020 8:20 am
Forum: Administrative Questions and Class Announcements
Topic: "Open Book" Final?
Replies: 30
Views: 574

Re: "Open Book" Final?

I don't think it is going to be very strict, so you can probably use any resource that you have available!
by Kallista McCarty 1C
Thu Mar 12, 2020 8:17 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 2
Views: 16

Re: Arrhenius Equation

I believe it is used to calculate the activation energy!
by Kallista McCarty 1C
Thu Mar 12, 2020 8:15 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Pre-equilibrium vs Steady state approach
Replies: 3
Views: 39

Re: Pre-equilibrium vs Steady state approach

We are only using the pre equilibrium method!
by Kallista McCarty 1C
Thu Mar 12, 2020 8:14 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Lavelle's review slides
Replies: 3
Views: 34

Re: Lavelle's review slides

Br is not a conducting solid, so Pt needs to be added!
by Kallista McCarty 1C
Wed Mar 11, 2020 9:11 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Activation Energy
Replies: 7
Views: 359

Re: Activation Energy

Activation energy is the minimum amount of energy needed for a reaction to take place
by Kallista McCarty 1C
Wed Mar 11, 2020 9:07 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Temperature and Reaction Rate
Replies: 6
Views: 39

Re: Temperature and Reaction Rate

An increase in temperature leads to an increase in reaction rate. A decrease in temperature results in a slower reaction rate
by Kallista McCarty 1C
Wed Mar 11, 2020 9:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Format because I posted in 14A by accident
Replies: 8
Views: 88

Re: Format because I posted in 14A by accident

I am not sure about this either. Hopefully he sends out an email update soon!
by Kallista McCarty 1C
Wed Mar 11, 2020 9:05 pm
Forum: Administrative Questions and Class Announcements
Topic: final
Replies: 14
Views: 165

Re: final

I think that it will just be posted on his website and we will have until the end of the quarter (Friday night maybe?) to complete it. I don't think were going to have a set window anymore since it is so hard not being on campus. Im sure he will give us more information soon!
by Kallista McCarty 1C
Mon Mar 09, 2020 11:24 pm
Forum: *Enzyme Kinetics
Topic: Lecture 3/6
Replies: 3
Views: 49

Re: Lecture 3/6

Brian J Cheng 1I wrote:
Kallista McCarty 1C wrote:I was not able to make it to lecture on Friday, can someone explain what was covered?


If you would like some notes from that lecture, reply with your email and I can send them over :)


Thank you so much! My email is kallistamccarty@gmail.com
by Kallista McCarty 1C
Mon Mar 09, 2020 2:08 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Relationship Between Ecell and K
Replies: 9
Views: 61

Re: Relationship Between Ecell and K

K is greater than 1 if Ecell is greater than 0. K is less than 1 if Ecell is less than 0
by Kallista McCarty 1C
Mon Mar 09, 2020 2:05 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Steady-State Approach
Replies: 4
Views: 29

Re: Steady-State Approach

Lavelle said that we only need to know the pre equilibrium approach so there is nothing you have to know about steady state. He said it is discussed in the textbook if you wanted to look at it, but it is not required. You get the same answer from both approaches
by Kallista McCarty 1C
Mon Mar 09, 2020 2:03 pm
Forum: General Science Questions
Topic: Who makes the Final
Replies: 23
Views: 286

Re: Who makes the Final

I think the TAs made the final for 14A, but my TA said that Lavelle made the midterm for 14B so he will probably make the final as well
by Kallista McCarty 1C
Mon Mar 09, 2020 2:01 pm
Forum: Biological Examples
Topic: Catalysts
Replies: 6
Views: 57

Re: Catalysts

Nitric oxide (NO) is the only catalyst. The O2 is just a reactant
by Kallista McCarty 1C
Mon Mar 09, 2020 2:00 pm
Forum: *Enzyme Kinetics
Topic: Lecture 3/6
Replies: 2
Views: 57

Lecture 3/6

I was not able to make it to lecture on Friday, can someone explain what was covered?
by Kallista McCarty 1C
Mon Mar 09, 2020 2:00 pm
Forum: *Enzyme Kinetics
Topic: Lecture 3/6
Replies: 3
Views: 49

Lecture 3/6

I was not able to make it to lecture on Friday, can someone explain what was covered?
by Kallista McCarty 1C
Wed Mar 04, 2020 5:56 pm
Forum: Balancing Redox Reactions
Topic: Oxidizing and Reducing Agents
Replies: 5
Views: 62

Re: Oxidizing and Reducing Agents

Yes! Elements that are reduced are considered the oxidizing agent and elements that are oxidized are considered the reducing agent. I remember them as opposites of each other
by Kallista McCarty 1C
Wed Mar 04, 2020 5:55 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Variables
Replies: 3
Views: 32

Re: Variables

R and F are both constants that are given on the equation sheet. T is the temperature. n is the number of electrons transferred (determined by balancing the half reactions)
by Kallista McCarty 1C
Wed Mar 04, 2020 5:54 pm
Forum: General Science Questions
Topic: Test 2 Grades [ENDORSED]
Replies: 23
Views: 424

Re: Test 2 Grades [ENDORSED]

We normally get them back the following week in discussion
by Kallista McCarty 1C
Wed Mar 04, 2020 5:53 pm
Forum: Balancing Redox Reactions
Topic: oxidizing and reducing agents
Replies: 10
Views: 66

Re: oxidizing and reducing agents

You should look at the oxidation states or overall charge of the molecule to determine which is being oxidized or reduced
by Kallista McCarty 1C
Wed Mar 04, 2020 5:52 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: half reaction of cell diagram
Replies: 2
Views: 23

Re: half reaction of cell diagram

The solids should be on the outside of the cell diagram. The anode goes on the left and the cathode goes on the right normally
by Kallista McCarty 1C
Mon Mar 02, 2020 7:02 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: G=-nFE
Replies: 5
Views: 53

Re: G=-nFE

n is the number of electrons transferred. Once you balance the half reactions, the number of electrons transferred are equal to each other because they cancel out when you combine the two half reactions to create the full reaction.
by Kallista McCarty 1C
Mon Mar 02, 2020 7:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Test Two
Replies: 5
Views: 68

Re: Test Two

There are no official review sessions, but the step up sessions in cover are helpful to review/clarify new information
by Kallista McCarty 1C
Mon Mar 02, 2020 6:58 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: determine n
Replies: 16
Views: 506

Re: determine n

For the electrochemistry section, n represents the number of electrons transferred. You can find this by balancing the half reactions.
by Kallista McCarty 1C
Mon Mar 02, 2020 6:57 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs free energy equations
Replies: 5
Views: 54

Re: Gibbs free energy equations

I think the most common will be ∆G = -nFE˚ which is also equal to the maximum work
by Kallista McCarty 1C
Mon Mar 02, 2020 6:56 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Electrolysis
Replies: 2
Views: 46

Re: Electrolysis

It uses electron transfer to drive non-spontaneous (unfavorable) redox reactions
by Kallista McCarty 1C
Thu Feb 27, 2020 1:44 pm
Forum: General Science Questions
Topic: Test 2
Replies: 16
Views: 252

Re: Test 2

It will cover the rest of thermodynamics that was not on the midterm and all of electrochemistry!
by Kallista McCarty 1C
Thu Feb 27, 2020 1:40 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Which half reaction is cathode or anode?
Replies: 6
Views: 315

Re: Which half reaction is cathode or anode?

the anode is being oxidized (remember this because they both start with vowels) and the cathode is being reduced. Typically the anode is on the left and the cathode is on the right in cell diagrams!
by Kallista McCarty 1C
Thu Feb 27, 2020 1:38 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Additional resources: Thermodynamics
Replies: 5
Views: 114

Re: Additional resources: Thermodynamics

Lavelle has some practice questions posted on sapling learning that might be helpful!
by Kallista McCarty 1C
Thu Feb 27, 2020 1:38 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Hg and Cell Diagrams
Replies: 3
Views: 20

Re: Hg and Cell Diagrams

Liquid mercury is able to conduct heat on its own!
by Kallista McCarty 1C
Thu Feb 27, 2020 1:36 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: nerst
Replies: 7
Views: 69

Re: nerst

n is the number of electrons that are being transferred in the redox reaction. You find this number after balancing the equation.
by Kallista McCarty 1C
Mon Feb 24, 2020 7:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Hw 8
Replies: 10
Views: 92

Re: Hw 8

I would focus on the electrochemistry section (outline 5) because that is mainly what the test next week will cover
by Kallista McCarty 1C
Mon Feb 24, 2020 6:59 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Eo as an intensive property
Replies: 9
Views: 92

Re: Eo as an intensive property

It is intensive because it is measured under standard conditions
by Kallista McCarty 1C
Mon Feb 24, 2020 6:58 pm
Forum: Student Social/Study Group
Topic: 2/24 lecture
Replies: 5
Views: 55

Re: 2/24 lecture

We talked a lot about the Nernst equation and the different forms of the equation that you can use!
by Kallista McCarty 1C
Mon Feb 24, 2020 6:56 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: test 2 material clarification
Replies: 10
Views: 108

Re: test 2 material clarification

Test 2 will cover the rest of thermodynamics (things that were not on the midterm) and electrochemistry.
by Kallista McCarty 1C
Wed Feb 19, 2020 5:42 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Derivations
Replies: 5
Views: 63

Re: Derivations

I think the only one that we need to be able to derive is the Vant Hoff equation! Everything else should be given on the equation sheet (just make sure you can recognize what each one is)!
by Kallista McCarty 1C
Wed Feb 19, 2020 5:41 pm
Forum: Balancing Redox Reactions
Topic: Understanding Half-Reactions
Replies: 11
Views: 86

Re: Understanding Half-Reactions

It breaks it down so you can easily see what is being oxidized and what is being reduced!
by Kallista McCarty 1C
Wed Feb 19, 2020 5:40 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox
Replies: 5
Views: 39

Re: Balancing Redox

At a step up session they gave a couple rules for oxidation numbers and using them to balance redox reactions. 1. free elements have an oxidation number of 0 (ex. Cu) 2. in monoatomic ions, oxidation number is equal to its charge (ex. Na+ has a +1 charge) 3. oxygen is usually -2 4. hydrogen is +1 5....
by Kallista McCarty 1C
Wed Feb 19, 2020 5:36 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: midterm Q1A
Replies: 7
Views: 72

Re: midterm Q1A

Since it is an exothermic reaction, when heat is increased K is decreased and the reverse reaction is favored
by Kallista McCarty 1C
Wed Feb 19, 2020 5:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 10
Views: 107

Re: Test 2

Test 2 starts on Tuesday of week 9 (it got moved from the scheduled week 8) and covers the rest of thermodynamics (Gibbs free energy) and the whole electrochemistry outline
by Kallista McCarty 1C
Tue Feb 18, 2020 5:43 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: delta vs. delta naught
Replies: 3
Views: 38

Re: delta vs. delta naught

The naught symbolizes standard temperature and pressure (STP)
by Kallista McCarty 1C
Tue Feb 18, 2020 5:41 pm
Forum: Balancing Redox Reactions
Topic: Reduction vs. oxidation
Replies: 29
Views: 209

Re: Reduction vs. oxidation

It is based on electron transfer. I remember it by "OILRIG" Oxidation is losing e- and reduction is gaining e-
by Kallista McCarty 1C
Tue Feb 18, 2020 5:39 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Signs for Gibbs Free Energy
Replies: 11
Views: 90

Re: Signs for Gibbs Free Energy

Negative is spontaneous (exothermic) and positive is not spontaneous (endothermic)
by Kallista McCarty 1C
Tue Feb 18, 2020 5:39 pm
Forum: Balancing Redox Reactions
Topic: Reducing/Oxidizing Agent
Replies: 4
Views: 28

Re: Reducing/Oxidizing Agent

The reducing agent causes the reduction, so it is oxidized. The oxidizing agent causes the oxidizing, so it is reduced.
by Kallista McCarty 1C
Mon Feb 17, 2020 3:31 pm
Forum: Administrative Questions and Class Announcements
Topic: 14BL and 14C
Replies: 8
Views: 91

Re: 14BL and 14C

I have heard that it is doable to take those courses together!
by Kallista McCarty 1C
Fri Feb 14, 2020 6:59 pm
Forum: Ideal Gases
Topic: initial values
Replies: 6
Views: 102

Re: initial values

I think you use the initial!
by Kallista McCarty 1C
Fri Feb 14, 2020 6:56 pm
Forum: Ideal Gases
Topic: pv=nrt
Replies: 19
Views: 210

Re: pv=nrt

yes you can!
by Kallista McCarty 1C
Fri Feb 14, 2020 6:56 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm Curve
Replies: 45
Views: 427

Re: Midterm Curve

I'm not sure if there is an official "curve" but all you need is a 50% overall in the class to pass with a C
by Kallista McCarty 1C
Fri Feb 14, 2020 6:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K
Replies: 12
Views: 102

Re: K

You use gaseous and aqueous! You don't put in solids or liquids
by Kallista McCarty 1C
Fri Feb 14, 2020 6:53 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isobaric systems
Replies: 16
Views: 179

Re: Isobaric systems

Isobaric is constant temperature!
by Kallista McCarty 1C
Mon Feb 10, 2020 9:03 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Delta S sub m
Replies: 2
Views: 23

Re: Delta S sub m

The m refers to molar in this problem!
by Kallista McCarty 1C
Mon Feb 10, 2020 9:02 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 12
Views: 107

Re: Midterm

The midterm is Wednesday from 6-8. You can find your exact location depending on which lecture you are in and your last name on Lavelle's website. There is no lecture that day, but there is a small Q&A review session with a couple TAs during normal lecture time if you have last minute questions!
by Kallista McCarty 1C
Mon Feb 10, 2020 8:59 pm
Forum: Administrative Questions and Class Announcements
Topic: HW 6
Replies: 3
Views: 45

Re: HW 6

You can do any problems for this week! The most recent outline that we covered in class was thermodynamics, but you can turn in any problems as long as they are not ones that you have previously turned in!
by Kallista McCarty 1C
Mon Feb 10, 2020 8:58 pm
Forum: Phase Changes & Related Calculations
Topic: Reversible or Irreversible
Replies: 5
Views: 47

Re: Reversible or Irreversible

You should be able to tell given the context of the problem!
by Kallista McCarty 1C
Mon Feb 10, 2020 8:56 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous delta G
Replies: 7
Views: 34

Re: Spontaneous delta G

A reaction is spontaneous when delta G is negative, so by setting it to zero we were able to find the value and then determine the answer as "above 333K"
by Kallista McCarty 1C
Fri Feb 07, 2020 12:33 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Irreversible v Reversible
Replies: 4
Views: 49

Re: Irreversible v Reversible

Irreversible occurs under a constant pressure and reversible occurs under changing pressures.
by Kallista McCarty 1C
Fri Feb 07, 2020 12:31 pm
Forum: Student Social/Study Group
Topic: Midterm Topics
Replies: 12
Views: 139

Re: Midterm Topics

Everything that was covered up to the end of today's lecture will be included on the midterm!
by Kallista McCarty 1C
Fri Feb 07, 2020 12:29 pm
Forum: Calculating Work of Expansion
Topic: Isothermal
Replies: 17
Views: 122

Re: Isothermal

Isothermal means that there is a constant temperature and that delta U is also equal to 0
by Kallista McCarty 1C
Fri Feb 07, 2020 12:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Grading
Replies: 7
Views: 87

Re: Grading

You need a 50% to pass the class with a C-. The other letter grades are determined by the class average.
by Kallista McCarty 1C
Fri Feb 07, 2020 12:26 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Midterm Equations
Replies: 4
Views: 46

Re: Midterm Equations

You can find all the equations that we will be given on Lavelle's website on the constant and equations sheet! It is good to look at it to familiarize yourself with the ones that you'll need!
by Kallista McCarty 1C
Tue Feb 04, 2020 4:54 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: Big Midterm Review
Replies: 4
Views: 66

Re: Big Midterm Review

I think it was changed to Sunday because there were a lot of students who could not go Monday due to the LS30B midterm
by Kallista McCarty 1C
Tue Feb 04, 2020 4:53 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Topics on the Midterm
Replies: 22
Views: 181

Re: Topics on the Midterm

The midterm will cover everything until the end of the thermodynamics outline! He should finish lecturing on it this week
by Kallista McCarty 1C
Tue Feb 04, 2020 4:51 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: closed vs isolated
Replies: 14
Views: 83

Re: closed vs isolated

Heat can be transferred with the surroundings in a closed system but matter cannot. Neither can be transferred with the surroundings in an isolated system.
by Kallista McCarty 1C
Tue Feb 04, 2020 4:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Step Up Sessions
Replies: 15
Views: 2833

Re: Step Up Sessions

for anyone that's been, have you found them helpful/how is the pace of the step-up sessions I go to Jonathan's sessions and I find them extremely helpful! He goes over homework and old test questions and explains the important concepts/equations from lecture and the different contexts that they can...
by Kallista McCarty 1C
Tue Feb 04, 2020 4:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 1 Distribution
Replies: 9
Views: 129

Re: Test 1 Distribution

Lavelle does not give out distribution curves for his test so it is hard to see how you compare
by Kallista McCarty 1C
Thu Jan 30, 2020 5:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Test 1 Problem 5
Replies: 1
Views: 42

Test 1 Problem 5

Can someone explain question 5 from the test (the pKa of triethylamine cation is 11.04. A 0.2M solution or triethylamine was made to use as a weak base in the synthesis of a new pharmaceutical. What is the pH of this solution at equilibrium?)
by Kallista McCarty 1C
Thu Jan 30, 2020 5:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Test 1 Problem 5
Replies: 1
Views: 33

Test 1 Problem 5

Can someone explain question 5 from the test (the pKa of triethylamine cation is 11.04. A 0.2M solution or triethylamine was made to use as a weak base in the synthesis of a new pharmaceutical. What is the pH of this solution at equilibrium?)
by Kallista McCarty 1C
Thu Jan 30, 2020 5:13 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Qv vs Qp
Replies: 7
Views: 42

Re: Qv vs Qp

qv is constant volume and qp is constant pressure
by Kallista McCarty 1C
Thu Jan 30, 2020 5:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Test 1 Problem 1
Replies: 1
Views: 35

Test 1 Problem 1

Can someone explain problem 1 a) calculate the concentration of each species at equilibrium?
by Kallista McCarty 1C
Thu Jan 30, 2020 5:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Test #1// #6
Replies: 2
Views: 42

Re: Test #1// #6

The pH is 2.92, so the H+ concentration is 10^-2.92 = 1.20 x 10^-3. The pOH is 14-2.92=11.08. The OH- concentration is 10^-11.08 = 8.32 x 10^-12. The Ka is equal to the H+ concentration which is 1.20 x 10^-3. The percent ionization is (1.20 x 10^-3)/(0.010) x 100% = 12%.
by Kallista McCarty 1C
Tue Jan 28, 2020 4:16 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: delta H units
Replies: 4
Views: 31

Re: delta H units

I believe it should be kJ/mol, but my TA has used just kJ when writing out the problem and then just inserted kJ/mol at the end. I think it is just a convenience thing!
by Kallista McCarty 1C
Tue Jan 28, 2020 4:12 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: qp vs qv
Replies: 6
Views: 41

Re: qp vs qv

qp just shows constant pressure and qv shows constant volume.
by Kallista McCarty 1C
Tue Jan 28, 2020 4:11 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Test 2
Replies: 7
Views: 72

Re: Test 2

It will only focus on the material covered in the weeks after the midterm! There won't be any content from before that on the second test
by Kallista McCarty 1C
Tue Jan 28, 2020 4:09 pm
Forum: Ideal Gases
Topic: Chemical Equilibrium
Replies: 4
Views: 27

Re: Chemical Equilibrium

Catalysts are used to speed up reactions, but they do not have an effect on the equilibrium constant!
by Kallista McCarty 1C
Tue Jan 28, 2020 4:08 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Adding Enthalpies
Replies: 5
Views: 32

Re: Adding Enthalpies

You add the enthalpies since they are state functions!
by Kallista McCarty 1C
Thu Jan 23, 2020 5:15 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Kw = (Ka)(Kb)
Replies: 4
Views: 49

Re: Kw = (Ka)(Kb)

Yes, if no temperature is stated you can assume 25 Celsius to solve!
by Kallista McCarty 1C
Thu Jan 23, 2020 5:14 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Approximation
Replies: 5
Views: 41

Re: Approximation

When K is smaller than 10^-3!
by Kallista McCarty 1C
Thu Jan 23, 2020 5:12 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: pKa/pKb and Ka/Kb
Replies: 5
Views: 44

Re: pKa/pKb and Ka/Kb

Ka = 10^-pKa
Kb = 10^-pKb
by Kallista McCarty 1C
Thu Jan 23, 2020 5:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K value
Replies: 7
Views: 48

Re: K value

You approximate if K is smaller than 10^-3
by Kallista McCarty 1C
Thu Jan 23, 2020 5:09 pm
Forum: Student Social/Study Group
Topic: Midterm and Final Question
Replies: 18
Views: 221

Re: Midterm and Final Question

The UA's typically will put together a worksheet and post it on here, but Lavelle does not give one out.
by Kallista McCarty 1C
Mon Jan 20, 2020 3:19 pm
Forum: Ideal Gases
Topic: R constant for PV=nRT
Replies: 7
Views: 50

Re: R constant for PV=nRT

The R value will be given on the constant and equations sheet on the test! I know that there are different units that you use depending on the question, but they will both be given
by Kallista McCarty 1C
Mon Jan 20, 2020 3:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Van’t Hoff Equation
Replies: 4
Views: 51

Re: Van’t Hoff Equation

I don't think Lavelle has ever discussed this in lecture, so we won't be asked to use it on the test!
by Kallista McCarty 1C
Mon Jan 20, 2020 3:17 pm
Forum: Administrative Questions and Class Announcements
Topic: Workshop Monday
Replies: 2
Views: 72

Re: Workshop Monday

There is a workshop session from 6-8 and drop ins from 8-9, but it does not say who is holding them.
by Kallista McCarty 1C
Mon Jan 20, 2020 3:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5I.25
Replies: 2
Views: 31

Re: 5I.25

If K is smaller than 10^-3 then you can use the approximation method Lavelle taught us in lecture!
by Kallista McCarty 1C
Mon Jan 20, 2020 3:14 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kw temperature
Replies: 8
Views: 51

Re: Kw temperature

Kw is measured at 25 degrees celsius!
by Kallista McCarty 1C
Fri Jan 17, 2020 3:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Value of Kw
Replies: 6
Views: 43

Re: Value of Kw

Kw is always equal to 1.0 x 10^-14 at 25 degrees celsius!
by Kallista McCarty 1C
Wed Jan 15, 2020 8:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ka + Kb
Replies: 6
Views: 39

Re: Ka + Kb

This is irrelevant to the stated question, but does anyone know if we can still turn in chemical equilibrium hw questions for week 2? Or does it have to be acids and bases? Since we still covered chemical equilibrium this week, you can turn in problems from that section as long as they are differen...
by Kallista McCarty 1C
Wed Jan 15, 2020 8:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When to use K and Kp
Replies: 12
Views: 65

Re: When to use K and Kp

Kristina Rizo 2K wrote:I thought Kp was used for gas only? Can someone clarify this please.

Kp is used for gases to determine partial pressures! Kc is used for concentrations and Ka and Kb are for acids and bases.
by Kallista McCarty 1C
Wed Jan 15, 2020 8:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Study Guide Test One
Replies: 17
Views: 153

Re: Study Guide Test One

There isn't one given out, but it is good to base your studying on the learning outcomes for the sections.
by Kallista McCarty 1C
Mon Jan 13, 2020 1:44 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q=K
Replies: 14
Views: 91

Re: Q=K

When Q=K the reaction is at equilibrium. When Q<K the forward reaction is favored and when Q>K the reverse reaction is favored.
by Kallista McCarty 1C
Mon Jan 13, 2020 1:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Units for K
Replies: 21
Views: 150

Re: Units for K

Since K is a constant it does not have units associated with it!
by Kallista McCarty 1C
Mon Jan 13, 2020 1:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Hw for next week
Replies: 19
Views: 146

Re: Hw for next week

You can do homework on chemical equilibria or acids and bases. Just make sure it is different problems than the ones that you did last week!
by Kallista McCarty 1C
Mon Jan 13, 2020 1:39 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: What is this?
Replies: 23
Views: 400

Re: What is this?

The principle works to minimize the change on the reaction by shifting the direction that the reaction takes place in order to maintain equilibrium.
by Kallista McCarty 1C
Mon Jan 13, 2020 1:37 pm
Forum: Ideal Gases
Topic: Topics for Test 1
Replies: 17
Views: 158

Re: Topics for Test 1

I think it will be on chemical equilibria and acids and bases! I find it helpful to go to the peer learning sessions in Covel because they typically cover the test topics!
by Kallista McCarty 1C
Thu Jan 09, 2020 5:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K
Replies: 3
Views: 35

Re: K

I think you would convert one to the other! Lavelle gave us the equation PV=nRT for this! concentration x RT is the pressure.
by Kallista McCarty 1C
Thu Jan 09, 2020 5:19 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Using Kc Vs Kp
Replies: 18
Views: 158

Re: Using Kc Vs Kp

You should be able to tell based on the question that is being asked!
by Kallista McCarty 1C
Thu Jan 09, 2020 5:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q
Replies: 2
Views: 40

Re: Q

Q is the reaction quotient, so you use it to compare to equilibrium. You can use it to study biological systems like rivers when you do not know which way the reaction is occurring. If Q<K the forward reaction is favored and if Q>K then the reverse reaction is favored.

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