CHEMISTRY COMMUNITY

Amy_Hoang_1E

I understand how to set up the equation with the ln k2/k1=Ea/R (1/T1 - 1/T2) equation with the information given from the problem. Which is "The rate constant of the reaction between CO2 and OH- in aqueous solution to give the HCO3- ion is 1.5 x 10^10 L/(mol)(s) at 25C. Determine the rate const...

Amy_Hoang_1E

Can someone please explain number 7! I know it's a straight forward problem, but I must be missing a step because I can't seem to get the correct answer. So for number 7, you can use the 1st order integrated rate law, which is ln[A] = -kt + ln [A]initial and then isolate k, since you're solving for...

Amy_Hoang_1E

For number 8 of the Practice quiz, when I calculated the answer it came out to be in seconds, but the answer provided was in minutes. Is it necessary to always convert the answer to minutes when they are asking for time. Or does it not matter if we have either seconds or minutes?

Amy_Hoang_1E

For question 3C, why did we convert n in n deltaHvap to m(1mol/18.02g)?

I'm confused as to why they decided to change it.

Amy_Hoang_1E

My question is regarding Question 1D for the Winter Midterm 2014 review. Where did they get the K equation from? What was the original equation? I see a very similar equation ( K= A e^-Ea/RT), but I'm confused as to how the Ea is replaced with deltaG.

Amy_Hoang_1E

For Question 2A of the Winter 2013 Midterm in the Course Reader, I'm confused on how they obtained the equation for the heat capacity of ice. In the course reader, the solutions shows q(ice)= (n)(deltaH fusion) + m C deltaT I know where the m C deltaT came from because that is one of the equations, ...

Amy_Hoang_1E

Is there a difference between the oxidizing and reducing agent and the species that is oxidized and reduced? I'm confused between what I think is being oxidized/reduced.

Amy_Hoang_1E

I'm currently working on chapter 8, number 47. The question asks: "For a certain reaction at constant pressure deltaH=-15kJ, and 22kJ of expansion work is done on the system. What is deltaU for this process?" I understand the concept and which equation to use, but for "w=-p deltav&quo...

Amy_Hoang_1E

I'm working on the Chapter 8 homework problems and I just have a general question regarding work. Just for clarification: when work is done BY the system, the answer is negative and when work is done ON the system, the answer is positive? Does this always apply when the change is occurring at consta...

Amy_Hoang_1E

Will there ever be a time in which reversing the reaction will not lead to simply reversing the sign changes of all components of the equation? I don't believe so. Usually when you reverse the reaction, you have to switch the sign because for example, putting in enthalpy (endothermic) is the revers...

Amy_Hoang_1E

How do I create a new post? All I know is how to "Post Reply". Also, how do I change my username to include this quarter's discussion section and not the old one from last quarter in 14A? To change your username, go to the main page or any page on chemistry community, and at the top next ...

CHEMISTRY COMMUNITY

Search found 11 matches

Chapter 15, Question 63

Re: Quiz 2 Winter 2017

Units

Winter 2014 Midterm Q3C

Midterm Winter 2014 Q1D

Midterm WINTER 2013 Question

Oxidation [ENDORSED]

Reaction Enthalpy

Work is done by the system.... [ENDORSED]

Re: Delta H subscripts

Re: How to find my posts