Search found 10 matches

by Camille_2G
Sun Mar 19, 2017 10:40 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Sig figs
Replies: 3
Views: 469

Re: Sig figs

What about sig figs for exponents? Like if you had e^3.18, would you have two total sig figs in your answer or would you have two decimal places in your answer?
by Camille_2G
Mon Mar 13, 2017 8:17 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1011031

Re: Post All Chemistry Jokes Here

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by Camille_2G
Sun Mar 05, 2017 12:48 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1011031

Re: Post All Chemistry Jokes Here

Image
by Camille_2G
Tue Feb 21, 2017 3:49 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1011031

Re: Post All Chemistry Jokes Here

You know what's exciting?
Electrons moving to higher sub shells
by Camille_2G
Mon Feb 13, 2017 11:11 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Winter 2013 Midterm Q5B
Replies: 2
Views: 283

Winter 2013 Midterm Q5B

Arrange the following substances in order of increasing standard molar entropy:
CHF3 (g), CF4 (g), CH3F (g), CH2F2 (g)

CH3F (g) < CH2F2 (g) < CHF3 (g) < CF4 (g)

Can someone please explain why CF4 has the highest standard molar entropy?


Thanks in advance.
by Camille_2G
Sun Feb 12, 2017 11:41 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1011031

Re: Post All Chemistry Jokes Here

Image
by Camille_2G
Wed Feb 01, 2017 11:06 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Exercise 9.37 (Absolute Entropies)
Replies: 2
Views: 255

Re: Exercise 9.37 (Absolute Entropies)

The absolute entropy for an element is not 0 as there is disorder with the atoms in the element. The absolute entropy is only 0 for perfect crystals when T=O K as all atomic motion stops at this temperature. Also, the change in entropy is not 0 when a compound is formed from its elements as there is...
by Camille_2G
Sun Jan 29, 2017 8:28 pm
Forum: Calculating Work of Expansion
Topic: max amount of work
Replies: 4
Views: 358

max amount of work

Can someone please explain how a reversible expansion gives the max amount of work and why work for a reversible process is more negative than work for an irreversible process?


Thanks in advance.
by Camille_2G
Thu Jan 19, 2017 8:34 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Another "work" definition? [ENDORSED]
Replies: 1
Views: 301

Re: Another "work" definition? [ENDORSED]

w=-P(delta)V We have to use integrals to find work as the pressure is not constant. From the ideal gas law, P=nRT/V. As the external pressure (P) is not constant, V is also changing. Substituting the ideal gas law for P in the equation and changing delta V to dV, we then get w=\int (nRT/\Delta V...
by Camille_2G
Sun Jan 15, 2017 8:51 pm
Forum: Phase Changes & Related Calculations
Topic: Triple Point
Replies: 3
Views: 341

Re: Triple Point

Yes, the triple point occurs for other molecules such as cyclohexane.

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