CHEMISTRY COMMUNITY

Emily Tam 1k

what is the purpose of the unique rate?

Emily Tam 1k

what is the difference between a concentration cell, a galvanic cell, a voltaic cell, and an electrolytic cell?

Emily Tam 1k

in lyndon's review today, he set the unique rate law equal to the reaction mechanism. why do you do that?

Emily Tam 1k

how are ∆G and work related? is it that if something is spontaneous then it will do more work?

Emily Tam 1k

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?

Emily Tam 1k

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?

Emily Tam 1k

do you need to include liquids in the equilibrium expression?

Emily Tam 1k

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?

Emily Tam 1k

is the kprime in pseudo rate reactions the same as the kprime in reaction mechanisms in that it equals the reverse reaction?

Emily Tam 1k

u the goat thx lyndon

Emily Tam 1k

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?

Emily Tam 1k

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?

Emily Tam 1k

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

Emily Tam 1k

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?

Emily Tam 1k

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?

Emily Tam 1k

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?

Emily Tam 1k

When referring to SI units, should we always resort to using atm or barr?

Emily Tam 1k

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

Emily Tam 1k

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?

Emily Tam 1k

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?

Emily Tam 1k

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?

Emily Tam 1k

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...

Emily Tam 1k

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...

Emily Tam 1k

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?

Emily Tam 1k

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...

Emily Tam 1k

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.

Emily Tam 1k

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

Emily Tam 1k

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?

Emily Tam 1k

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?

Emily Tam 1k

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?

CHEMISTRY COMMUNITY

Search found 30 matches

unique rate

different types of cells

unique rate law and reaction mechanisms?

∆G and work

adiabatic systems

n value

equilibirum expression

exponential vs ln equations

pseudo rate reactions

Re: LYNDON'S PORK RAMEN REVIEW

kprime and k1

units in regards to C

moles / mass in phase change problems

graphing intermediates

Ecell

Anode and Cathode determination

SI Units

Ecell Values

E equations and when to use them?

Cp vs Cv

ordering reduction potential powers

6th edition 15.39 part b

6th edition 15.19 part c

6th edition 15.17

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

integrating equations

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

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

6th edition 15.19 part c

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