## Test 1

General non-science questions and class announcements.

camrynpatterson3C
Posts: 44
Joined: Fri Sep 29, 2017 7:07 am

### Test 1

Hi,
Lavelle said that problems relating to work and internal energy won't be on Test 1. I was wondering what this meant in terms of what homework problems are relevant. Is it everything from 8.29 on that is still for this test, and just not 8.1-8.27?

camrynpatterson3C
Posts: 44
Joined: Fri Sep 29, 2017 7:07 am

### Re: Test 1

Also, I realized there are problems on the homework such as 8.47 and 8.53 that deal with delta U, although the question as a whole is about reaction enthalpies. Are we not expected to do problems like that on this test either?

Posts: 62
Joined: Thu Jul 27, 2017 3:01 am

### Re: Test 1

On the class site, Dr. Lavelle said that "Concept questions involving work and internal energy will be on Test 1, but not calculating w and delta U"

Conceptionally, we are supposed to understand work and internal energy. But we will not have to solve for questions that uses delta U = q + w. I would expect, for calculative purposes, the formula to focus on would be dH (or q) = nCpdT and its "mCAT" variant formula.

Also another formula to note is dH = dU - PdV, because you could also be given U and other values.

I would focus on the thermochemistry homework problems to study. In addition, definitely know the three ways to find enthalpy, which is using Hess's Law, Bond Enthalpies, or Standard Enthalpy.

Sabrina Fardeheb 2B
Posts: 51
Joined: Sat Jul 22, 2017 3:00 am
Been upvoted: 1 time

### Re: Test 1

Maybe if we are given the values of delta H and delta U, then we would be expected to solve for the rest of the problem, but not for those values particularly. In addition, I'm pretty sure we won't have to worry about which equations to use since they will be provided to us on his worksheet