Search found 212 matches
- Thu Mar 12, 2020 9:10 am
- Forum: Administrative Questions and Class Announcements
- Topic: ENDGAME Review Session
- Replies: 71
- Views: 5669
Re: ENDGAME Review Session
Are the answers for this worksheet going to be posted soon?
- Thu Mar 12, 2020 8:21 am
- Forum: Balancing Redox Reactions
- Topic: Determining the oxidizer and reducer
- Replies: 10
- Views: 741
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!
- Thu Mar 12, 2020 8:20 am
- Forum: Administrative Questions and Class Announcements
- Topic: "Open Book" Final?
- Replies: 30
- Views: 2091
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!
- Thu Mar 12, 2020 8:17 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius Equation
- Replies: 2
- Views: 199
Re: Arrhenius Equation
I believe it is used to calculate the activation energy!
- Thu Mar 12, 2020 8:15 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Pre-equilibrium vs Steady state approach
- Replies: 3
- Views: 307
Re: Pre-equilibrium vs Steady state approach
We are only using the pre equilibrium method!
- 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: 363
Re: Lavelle's review slides
Br is not a conducting solid, so Pt needs to be added!
- Wed Mar 11, 2020 9:11 pm
- Forum: *Free Energy of Activation vs Activation Energy
- Topic: Activation Energy
- Replies: 9
- Views: 1505
Re: Activation Energy
Activation energy is the minimum amount of energy needed for a reaction to take place
- Wed Mar 11, 2020 9:07 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Temperature and Reaction Rate
- Replies: 6
- Views: 475
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
- 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: 620
Re: Format because I posted in 14A by accident
I am not sure about this either. Hopefully he sends out an email update soon!
- Wed Mar 11, 2020 9:05 pm
- Forum: Administrative Questions and Class Announcements
- Topic: final
- Replies: 14
- Views: 976
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!
- Mon Mar 09, 2020 11:24 pm
- Forum: *Enzyme Kinetics
- Topic: Lecture 3/6
- Replies: 3
- Views: 370
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
- 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: 3276
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
- Mon Mar 09, 2020 2:05 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Steady-State Approach
- Replies: 4
- Views: 315
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
- Mon Mar 09, 2020 2:03 pm
- Forum: General Science Questions
- Topic: Who makes the Final
- Replies: 23
- Views: 1444
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
- Mon Mar 09, 2020 2:01 pm
- Forum: Biological Examples
- Topic: Catalysts
- Replies: 7
- Views: 872
Re: Catalysts
Nitric oxide (NO) is the only catalyst. The O2 is just a reactant
- Mon Mar 09, 2020 2:00 pm
- Forum: *Enzyme Kinetics
- Topic: Lecture 3/6
- Replies: 2
- Views: 389
Lecture 3/6
I was not able to make it to lecture on Friday, can someone explain what was covered?
- Mon Mar 09, 2020 2:00 pm
- Forum: *Enzyme Kinetics
- Topic: Lecture 3/6
- Replies: 3
- Views: 370
Lecture 3/6
I was not able to make it to lecture on Friday, can someone explain what was covered?
- Wed Mar 04, 2020 5:56 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidizing and Reducing Agents
- Replies: 5
- Views: 485
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
- 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: 248
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)
- Wed Mar 04, 2020 5:54 pm
- Forum: General Science Questions
- Topic: Test 2 Grades [ENDORSED]
- Replies: 23
- Views: 1620
Re: Test 2 Grades [ENDORSED]
We normally get them back the following week in discussion
- Wed Mar 04, 2020 5:53 pm
- Forum: Balancing Redox Reactions
- Topic: oxidizing and reducing agents
- Replies: 10
- Views: 819
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
- 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: 218
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
- Mon Mar 02, 2020 7:02 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: G=-nFE
- Replies: 5
- Views: 420
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.
- Mon Mar 02, 2020 7:01 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test Two
- Replies: 5
- Views: 378
Re: Test Two
There are no official review sessions, but the step up sessions in cover are helpful to review/clarify new information
- Mon Mar 02, 2020 6:58 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: determine n
- Replies: 16
- Views: 1430
Re: determine n
For the electrochemistry section, n represents the number of electrons transferred. You can find this by balancing the half reactions.
- Mon Mar 02, 2020 6:57 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs free energy equations
- Replies: 5
- Views: 432
Re: Gibbs free energy equations
I think the most common will be ∆G = -nFE˚ which is also equal to the maximum work
- 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: 237
Re: Electrolysis
It uses electron transfer to drive non-spontaneous (unfavorable) redox reactions
- Thu Feb 27, 2020 1:44 pm
- Forum: General Science Questions
- Topic: Test 2
- Replies: 16
- Views: 1005
Re: Test 2
It will cover the rest of thermodynamics that was not on the midterm and all of electrochemistry!
- 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: 850
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!
- Thu Feb 27, 2020 1:38 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Additional resources: Thermodynamics
- Replies: 5
- Views: 492
Re: Additional resources: Thermodynamics
Lavelle has some practice questions posted on sapling learning that might be helpful!
- 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: 244
Re: Hg and Cell Diagrams
Liquid mercury is able to conduct heat on its own!
- Thu Feb 27, 2020 1:36 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: nerst
- Replies: 7
- Views: 537
Re: nerst
n is the number of electrons that are being transferred in the redox reaction. You find this number after balancing the equation.
- Mon Feb 24, 2020 7:01 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Hw 8
- Replies: 10
- Views: 701
Re: Hw 8
I would focus on the electrochemistry section (outline 5) because that is mainly what the test next week will cover
- Mon Feb 24, 2020 6:59 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Eo as an intensive property
- Replies: 9
- Views: 648
Re: Eo as an intensive property
It is intensive because it is measured under standard conditions
- Mon Feb 24, 2020 6:58 pm
- Forum: Student Social/Study Group
- Topic: 2/24 lecture
- Replies: 5
- Views: 437
Re: 2/24 lecture
We talked a lot about the Nernst equation and the different forms of the equation that you can use!
- Mon Feb 24, 2020 6:56 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: test 2 material clarification
- Replies: 10
- Views: 681
Re: test 2 material clarification
Test 2 will cover the rest of thermodynamics (things that were not on the midterm) and electrochemistry.
- Mon Feb 24, 2020 6:53 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Homework Problems from Outline 5 or 6 this week?
- Replies: 2
- Views: 343
Re: Homework Problems from Outline 5 or 6 this week?
I would focus mainly on outline 5 this week!
- Wed Feb 19, 2020 5:42 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Derivations
- Replies: 5
- Views: 314
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)!
- Wed Feb 19, 2020 5:41 pm
- Forum: Balancing Redox Reactions
- Topic: Understanding Half-Reactions
- Replies: 11
- Views: 711
Re: Understanding Half-Reactions
It breaks it down so you can easily see what is being oxidized and what is being reduced!
- Wed Feb 19, 2020 5:40 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing Redox
- Replies: 5
- Views: 388
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....
- 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: 484
Re: midterm Q1A
Since it is an exothermic reaction, when heat is increased K is decreased and the reverse reaction is favored
- Wed Feb 19, 2020 5:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 10
- Views: 666
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
- Tue Feb 18, 2020 5:43 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: delta vs. delta naught
- Replies: 3
- Views: 423
Re: delta vs. delta naught
The naught symbolizes standard temperature and pressure (STP)
- Tue Feb 18, 2020 5:41 pm
- Forum: Balancing Redox Reactions
- Topic: Reduction vs. oxidation
- Replies: 29
- Views: 1195
Re: Reduction vs. oxidation
It is based on electron transfer. I remember it by "OILRIG" Oxidation is losing e- and reduction is gaining e-
- Tue Feb 18, 2020 5:39 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Signs for Gibbs Free Energy
- Replies: 11
- Views: 711
Re: Signs for Gibbs Free Energy
Negative is spontaneous (exothermic) and positive is not spontaneous (endothermic)
- Tue Feb 18, 2020 5:39 pm
- Forum: Balancing Redox Reactions
- Topic: Reducing/Oxidizing Agent
- Replies: 4
- Views: 287
Re: Reducing/Oxidizing Agent
The reducing agent causes the reduction, so it is oxidized. The oxidizing agent causes the oxidizing, so it is reduced.
- Mon Feb 17, 2020 3:31 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 14BL and 14C
- Replies: 8
- Views: 470
Re: 14BL and 14C
I have heard that it is doable to take those courses together!
- Fri Feb 14, 2020 6:59 pm
- Forum: Ideal Gases
- Topic: initial values
- Replies: 6
- Views: 513
Re: initial values
I think you use the initial!
- Fri Feb 14, 2020 6:56 pm
- Forum: Ideal Gases
- Topic: pv=nrt
- Replies: 19
- Views: 1205
Re: pv=nrt
yes you can!
- Fri Feb 14, 2020 6:56 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Midterm Curve
- Replies: 45
- Views: 2259
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
- Fri Feb 14, 2020 6:54 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K
- Replies: 12
- Views: 725
Re: K
You use gaseous and aqueous! You don't put in solids or liquids
- Fri Feb 14, 2020 6:53 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isobaric systems
- Replies: 16
- Views: 836
Re: Isobaric systems
Isobaric is constant temperature!
- 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: 226
Re: Delta S sub m
The m refers to molar in this problem!
- Mon Feb 10, 2020 9:02 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 12
- Views: 635
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!
- Mon Feb 10, 2020 8:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: HW 6
- Replies: 3
- Views: 174
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!
- Mon Feb 10, 2020 8:58 pm
- Forum: Phase Changes & Related Calculations
- Topic: Reversible or Irreversible
- Replies: 5
- Views: 316
Re: Reversible or Irreversible
You should be able to tell given the context of the problem!
- Mon Feb 10, 2020 8:56 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneous delta G
- Replies: 7
- Views: 438
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"
- Fri Feb 07, 2020 12:33 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Irreversible v Reversible
- Replies: 4
- Views: 261
Re: Irreversible v Reversible
Irreversible occurs under a constant pressure and reversible occurs under changing pressures.
- Fri Feb 07, 2020 12:31 pm
- Forum: Student Social/Study Group
- Topic: Midterm Topics
- Replies: 12
- Views: 728
Re: Midterm Topics
Everything that was covered up to the end of today's lecture will be included on the midterm!
- Fri Feb 07, 2020 12:29 pm
- Forum: Calculating Work of Expansion
- Topic: Isothermal
- Replies: 17
- Views: 794
Re: Isothermal
Isothermal means that there is a constant temperature and that delta U is also equal to 0
- Fri Feb 07, 2020 12:28 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading
- Replies: 7
- Views: 263
Re: Grading
You need a 50% to pass the class with a C-. The other letter grades are determined by the class average.
- Fri Feb 07, 2020 12:26 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Midterm Equations
- Replies: 4
- Views: 283
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!
- 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: 328
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
- Tue Feb 04, 2020 4:53 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Topics on the Midterm
- Replies: 22
- Views: 1108
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
- Tue Feb 04, 2020 4:51 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: closed vs isolated
- Replies: 14
- Views: 469
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.
- Tue Feb 04, 2020 4:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Step Up Sessions
- Replies: 71
- Views: 6982
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...
- Tue Feb 04, 2020 4:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 1 Distribution
- Replies: 9
- Views: 353
Re: Test 1 Distribution
Lavelle does not give out distribution curves for his test so it is hard to see how you compare
- Thu Jan 30, 2020 5:16 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Test 1 Problem 5
- Replies: 1
- Views: 123
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?)
- Thu Jan 30, 2020 5:16 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Test 1 Problem 5
- Replies: 1
- Views: 102
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?)
- Thu Jan 30, 2020 5:13 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Units for work
- Replies: 3
- Views: 144
Re: Units for work
You should use J or kJ!
- Thu Jan 30, 2020 5:13 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Qv vs Qp
- Replies: 7
- Views: 153
Re: Qv vs Qp
qv is constant volume and qp is constant pressure
- Thu Jan 30, 2020 5:11 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Test 1 Problem 1
- Replies: 1
- Views: 107
Test 1 Problem 1
Can someone explain problem 1 a) calculate the concentration of each species at equilibrium?
- Thu Jan 30, 2020 5:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Test #1// #6
- Replies: 2
- Views: 112
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%.
- 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: 527
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!
- 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: 358
Re: qp vs qv
qp just shows constant pressure and qv shows constant volume.
- Tue Jan 28, 2020 4:11 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Test 2
- Replies: 7
- Views: 252
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
- Tue Jan 28, 2020 4:09 pm
- Forum: Ideal Gases
- Topic: Chemical Equilibrium
- Replies: 4
- Views: 220
Re: Chemical Equilibrium
Catalysts are used to speed up reactions, but they do not have an effect on the equilibrium constant!
- 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: 223
Re: Adding Enthalpies
You add the enthalpies since they are state functions!
- Thu Jan 23, 2020 5:15 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Kw = (Ka)(Kb)
- Replies: 4
- Views: 191
Re: Kw = (Ka)(Kb)
Yes, if no temperature is stated you can assume 25 Celsius to solve!
- Thu Jan 23, 2020 5:14 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Approximation
- Replies: 5
- Views: 158
Re: Approximation
When K is smaller than 10^-3!
- Thu Jan 23, 2020 5:12 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: pKa/pKb and Ka/Kb
- Replies: 5
- Views: 183
Re: pKa/pKb and Ka/Kb
Ka = 10^-pKa
Kb = 10^-pKb
Kb = 10^-pKb
- Thu Jan 23, 2020 5:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K value
- Replies: 7
- Views: 232
Re: K value
You approximate if K is smaller than 10^-3
- Thu Jan 23, 2020 5:09 pm
- Forum: Student Social/Study Group
- Topic: Midterm and Final Question
- Replies: 18
- Views: 1105
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.
- Mon Jan 20, 2020 3:19 pm
- Forum: Ideal Gases
- Topic: R constant for PV=nRT
- Replies: 7
- Views: 464
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
- Mon Jan 20, 2020 3:18 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Van’t Hoff Equation
- Replies: 4
- Views: 229
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!
- Mon Jan 20, 2020 3:17 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Workshop Monday
- Replies: 2
- Views: 148
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.
- Mon Jan 20, 2020 3:15 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5I.25
- Replies: 2
- Views: 99
Re: 5I.25
If K is smaller than 10^-3 then you can use the approximation method Lavelle taught us in lecture!
- Mon Jan 20, 2020 3:14 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kw temperature
- Replies: 8
- Views: 180
Re: Kw temperature
Kw is measured at 25 degrees celsius!
- Fri Jan 17, 2020 3:12 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Value of Kw
- Replies: 6
- Views: 173
Re: Value of Kw
Kw is always equal to 1.0 x 10^-14 at 25 degrees celsius!
- Wed Jan 15, 2020 8:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ka + Kb
- Replies: 6
- Views: 162
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...
- Wed Jan 15, 2020 8:20 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: When to use K and Kp
- Replies: 12
- Views: 420
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.
- Wed Jan 15, 2020 8:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Study Guide Test One
- Replies: 17
- Views: 686
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.
- Mon Jan 13, 2020 1:44 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q=K
- Replies: 14
- Views: 666
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.
- Mon Jan 13, 2020 1:41 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Units for K
- Replies: 21
- Views: 662
Re: Units for K
Since K is a constant it does not have units associated with it!
- Mon Jan 13, 2020 1:41 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Hw for next week
- Replies: 19
- Views: 803
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!
- 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: 1474
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.
- Mon Jan 13, 2020 1:37 pm
- Forum: Ideal Gases
- Topic: Topics for Test 1
- Replies: 17
- Views: 688
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!
- Thu Jan 09, 2020 5:21 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K
- Replies: 3
- Views: 118
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.
- Thu Jan 09, 2020 5:19 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Using Kc Vs Kp
- Replies: 22
- Views: 1062
Re: Using Kc Vs Kp
You should be able to tell based on the question that is being asked!
- Thu Jan 09, 2020 5:18 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Q
- Replies: 2
- Views: 208
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.