Search found 4 matches

by g-omal
February 20th, 2018, 12:58 pm
Forum: 2018 Question Marathons
Topic: Chem Lab C
Replies: 18
Views: 3641

Re: Chem Lab C

Using band theory, explain how you can tell if a material is an insulator, conductor, or semiconductor. (PS: I'm not looking for "if it has a sea of electrons..." or "if it is a metal...") :)
by g-omal
February 19th, 2018, 2:33 pm
Forum: 2018 Question Marathons
Topic: Chem Lab C
Replies: 18
Views: 3641

Re: Chem Lab B/C

Answer:|Assuming we're talking about a monatomic ideal gas, you can use Cv = 3/2R and Cp = Cv + R. These come by setting U=3/2nRT equal to Q=nCvT in an isovolumetric process. Going way back, the 3/2 comes from some pretty neat degrees of freedom stuff, but I'm not exactly sure how far I should be g...
by g-omal
February 19th, 2018, 2:13 pm
Forum: 2018 Question Marathons
Topic: Chem Lab C
Replies: 18
Views: 3641

Re: Chem Lab B/C

Answer:|C. Temperature is constant during a phase change and is proportional to average kinetic energy of the particles. This question was on an invitational test: and I am pretty confident though my answer was marked wrong. What do you think: As a substance undergoes a change from the solid to the...
by g-omal
November 9th, 2017, 6:13 am
Forum: 2018 Question Marathons
Topic: Chem Lab C
Replies: 18
Views: 3641

Chem Lab C

Consider a Carnot engine (an insulated cylinder with a piston filled with a gas). Why must the cylinder expand during the isothermal phase of the Carnot cycle in which heat flows into the cylinder from a heat source?

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