Search found 10 matches

by RitaChang_2C
Sun Mar 19, 2017 12:14 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Winter 2015 Final Exam 1D
Replies: 1
Views: 270

Winter 2015 Final Exam 1D

How do you know when to use q=mCdeltaT vs q=CdeltaT?
by RitaChang_2C
Wed Mar 08, 2017 4:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 15483

Re: Quiz 3 Winter 2017

For number 5, how do we know the first step is the slow one? Also, could someone explain when and how to use iso- in naming? Or just how to do #1? I was also wondering the same thing. How do we know that the first step is the rate limiting step? Does it have to do with the intermediates in step 1? ...
by RitaChang_2C
Sun Mar 05, 2017 10:02 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885908

Re: Post All Chemistry Jokes Here

Did you hear about the man who got cooled to absolute zero?

He's 0K now.
by RitaChang_2C
Sun Feb 26, 2017 4:08 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885908

Re: Post All Chemistry Jokes Here

Image
by RitaChang_2C
Mon Feb 20, 2017 7:42 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885908

Re: Post All Chemistry Jokes Here

Want to hear a joke about sodium hypobromite?

NaBrO.
by RitaChang_2C
Sat Feb 11, 2017 10:06 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885908

Re: Post All Chemistry Jokes Here

I have many chemistry jokes.

I'm just afraid they won't get a good reaction.
by RitaChang_2C
Mon Jan 30, 2017 11:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 13381

Re: Quiz 1 Preparation Answers

You would use ΔG^o=ΔH^o−TΔS^o after you find ΔH^o (rxn) and ΔS^o (rxn) values from the tables provided. Make sure your units match. You will need to convert ΔS^o to KJ for the final answer. That is the equation I am using. And I remembered to convert J to kJ. Still got the wrong answer. I also do n...
by RitaChang_2C
Mon Jan 30, 2017 9:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 13381

Re: Quiz 1 Preparation Answers

104450116 wrote:For number 3, what equation do we use since there seems to be a change in pressure? I can't seem to get the answer posted here by any method I've tried.
Thanks.


Use w=-nRT ln V2/V1
So then you'd get -(2.00 mol)(8.314 J/K mol)(300 K)(ln 18.00/6.00) to get -5480 J or -5.48 kJ.
by RitaChang_2C
Thu Jan 26, 2017 4:18 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885908

Re: Post All Chemistry Jokes Here

How often do you like jokes about elements?

Periodically.
by RitaChang_2C
Fri Jan 13, 2017 11:39 pm
Forum: Student Social/Study Group
Topic: Chemistry Joke
Replies: 28
Views: 2649

Re: Chemistry Joke

If H2O is the formula for water, what is the formula for ice?
H2O cubed!

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