Search found 30 matches

by Emily Tam 1k
Sat Mar 16, 2019 10:44 pm
Forum: General Rate Laws
Topic: unique rate
Replies: 3
Views: 177

unique rate

what is the purpose of the unique rate?
by Emily Tam 1k
Sat Mar 16, 2019 10:41 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: different types of cells
Replies: 1
Views: 178

different types of cells

what is the difference between a concentration cell, a galvanic cell, a voltaic cell, and an electrolytic cell?
by Emily Tam 1k
Sat Mar 16, 2019 10:38 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: unique rate law and reaction mechanisms?
Replies: 1
Views: 214

unique rate law and reaction mechanisms?

in lyndon's review today, he set the unique rate law equal to the reaction mechanism. why do you do that?
by Emily Tam 1k
Sat Mar 16, 2019 10:37 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: ∆G and work
Replies: 3
Views: 403

∆G and work

how are ∆G and work related? is it that if something is spontaneous then it will do more work?
by Emily Tam 1k
Sat Mar 16, 2019 10:35 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: adiabatic systems
Replies: 7
Views: 244

adiabatic systems

when a system is adiabatic, does that mean no heat is being introduced into the system or does it mean that there is no existing heat at all inside the system?
by Emily Tam 1k
Sat Mar 16, 2019 10:33 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: n value
Replies: 3
Views: 191

n value

does the n in electrochemistry stand for the number of electrons or number of moles of electrons? how does n cancel out with other units?
by Emily Tam 1k
Sat Mar 16, 2019 10:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: equilibirum expression
Replies: 3
Views: 224

equilibirum expression

do you need to include liquids in the equilibrium expression?
by Emily Tam 1k
Sat Mar 16, 2019 10:29 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: exponential vs ln equations
Replies: 1
Views: 171

exponential vs ln equations

is there a specific situation where you should use the exponential equation over the ln equation or does it not matter which equation you use? although the answers will be slightly different, will the TAs take points off for the difference?
by Emily Tam 1k
Sat Mar 16, 2019 10:28 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: pseudo rate reactions
Replies: 2
Views: 206

pseudo rate reactions

is the kprime in pseudo rate reactions the same as the kprime in reaction mechanisms in that it equals the reverse reaction?
by Emily Tam 1k
Sat Mar 16, 2019 6:43 pm
Forum: Administrative Questions and Class Announcements
Topic: LYNDON'S PORK RAMEN REVIEW
Replies: 37
Views: 2598

Re: LYNDON'S PORK RAMEN REVIEW

u the goat thx lyndon
by Emily Tam 1k
Sat Mar 16, 2019 3:38 am
Forum: *Enzyme Kinetics
Topic: kprime and k1
Replies: 1
Views: 192

kprime and k1

When solving the pre-equilibrium method, we are told to write the fraction k1/k-1. instead of writing this, can we just write k, or do they mean different things?
by Emily Tam 1k
Sat Mar 16, 2019 3:37 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: units in regards to C
Replies: 1
Views: 199

units in regards to C

If the constant C does not include a certain unit, should we still include it?
For example, the equation for ∆S = nCln(t2/t1). if we are given grams, but the c value given does not include grams in the units, should we still include the mass in the final answer?
by Emily Tam 1k
Sat Mar 16, 2019 3:35 am
Forum: Phase Changes & Related Calculations
Topic: moles / mass in phase change problems
Replies: 3
Views: 195

moles / mass in phase change problems

when it comes to solving phase changes, do you always use the grams given or would we have to convert it to moles every time
by Emily Tam 1k
Sat Mar 16, 2019 3:32 am
Forum: *Enzyme Kinetics
Topic: graphing intermediates
Replies: 2
Views: 182

graphing intermediates

When graphing the energy diagram for an exothermic reaction, where do you place the intermediate in the graph? do we have to graph catalysts too?
by Emily Tam 1k
Sat Mar 16, 2019 3:31 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Ecell
Replies: 3
Views: 205

Ecell

Why does a greater Ecell value a better option? Wouldn't a higher Ecell value mean that the cell has a greater ability to reduce something, thus causing the cell to become more positive?
by Emily Tam 1k
Sat Mar 16, 2019 3:30 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Anode and Cathode determination
Replies: 1
Views: 171

Anode and Cathode determination

When determining which equation is the anode or the cathode, do you look at the highest positive E number and keep that as the anode? I remember Dr. Lavelle mentioning this in class, but is it because you want a higher Ecell?
by Emily Tam 1k
Sat Mar 16, 2019 3:28 am
Forum: Ideal Gases
Topic: SI Units
Replies: 3
Views: 209

SI Units

When referring to SI units, should we always resort to using atm or barr?
by Emily Tam 1k
Sat Mar 16, 2019 3:27 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Ecell Values
Replies: 3
Views: 199

Ecell Values

When multiplying a half-reaction by a certain number to match up with the electrons, do you also multiply the E of the cell? or does the Ecell remain independent on the amount of moles in the reaction
by Emily Tam 1k
Fri Mar 15, 2019 9:31 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: E equations and when to use them?
Replies: 2
Views: 44

E equations and when to use them?

On the constant sheet there are two equations:
E=Eº - RT/nF(lnQ) and E=Eº - 0.05916/n(logQ)

What is the difference between the two? In what situations would i use these equations, or does it not matter?
by Emily Tam 1k
Fri Mar 15, 2019 5:07 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Cp vs Cv
Replies: 1
Views: 196

Cp vs Cv

How do you know when to use Cp vs Cv?

For example, I am doing a problem where the helium balloon increases from 3.0L to 3.5L and the helium behaves as an ideal gas. Why would you use Cv when solving for the problem instead of Cp when volume is not constant?
by Emily Tam 1k
Fri Mar 15, 2019 3:17 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: ordering reduction potential powers
Replies: 3
Views: 54

ordering reduction potential powers

if oxidizing power means that the species itself is being reduced, then will you order the powers based from least to greatest positivity or greatest to least positivity? Wouldn't a greater negativity mean it is stronger?
by Emily Tam 1k
Fri Mar 15, 2019 3:14 am
Forum: Second Order Reactions
Topic: 6th edition 15.39 part b
Replies: 2
Views: 194

6th edition 15.39 part b

Determine the time required for each of the following second-order reactions to take place: (b) A--> 2B + C, when [A]0 = 0.15 mol/L, for the concentration of B to increase to 0.19 mol/l, given that k=0.0035 l/molmin in the rate law for the loss of A Why do we subtract (0.19)/(2 mol B) from the origi...
by Emily Tam 1k
Fri Mar 15, 2019 3:08 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: 6th edition 15.19 part c
Replies: 1
Views: 163

6th edition 15.19 part c

In the 6th edition, there is a question asking us to solve for the value of the rate constant (k). There is a table given with all the reaction concentrations and overall rate, and we are to solve for the value K with the table. My question is why did the textbook decide to use the 4th reaction inst...
by Emily Tam 1k
Fri Mar 15, 2019 3:03 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: 6th edition 15.17
Replies: 1
Views: 148

6th edition 15.17

For part A of question 17 in chapter 15, it is stated that C is independent of the rate.
Because of that, do we ignore [C] when calculating the individual orders and the overall order?
by Emily Tam 1k
Fri Mar 15, 2019 2:38 am
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7538

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

how do you solve for worksheet 9 number 6? I used the half-life equation for a first-order reaction and solved for k when the half-life was 6 days. my k value was 0.1155. In order to find the percent of Hg(II) left in the body, would I have to find the k value for the 30-day half-life and divide the...
by Emily Tam 1k
Fri Mar 15, 2019 2:30 am
Forum: Second Order Reactions
Topic: integrating equations
Replies: 2
Views: 206

integrating equations

Do we have to know the steps for integrating a 1st/2nd/0 order rate law or should we just focus on the equations that are derived from this? A problem showed up on Karen's worksheet, which I'm assuming is from a previous exam.
by Emily Tam 1k
Fri Mar 15, 2019 2:26 am
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7538

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

how do you solve 5a on worksheet number 9?
I know the second order equation is 1/[A]=kt+1/[A]0. If I were to use this equation, wouldn't I just plug the values given into the equation?
The answer that i got was 7.14x10^-11, which is different from the answer. pls help thxxxx
by Emily Tam 1k
Fri Mar 15, 2019 2:18 am
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7538

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

for number 6 of karen's 8th worksheet (kinetics pt 1),

why does k not depend on the order of the reaction? wouldn't the reaction order depend on the value of K?
If there is a higher order then wouldn't the k value be higher?
by Emily Tam 1k
Fri Mar 15, 2019 2:15 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: 6th edition 15.19 part c
Replies: 1
Views: 37

6th edition 15.19 part c

Part C:
From the data, determine the value of the rate constant
The solutions manual converted the values from mmol to mole. Why do we have to do that when it is not specified?
by Emily Tam 1k
Fri Mar 15, 2019 2:11 am
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7538

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

for number 5 of karen's 9th worksheet (kinetics), it says that the rate constant is 7.0x10^0 M.s. Does M stand for molarity or for minutes?

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