Search found 10 matches
- Sun Mar 19, 2017 10:40 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Sig figs
- Replies: 3
- Views: 842
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?
- Mon Mar 13, 2017 8:17 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642784
- Sun Mar 05, 2017 12:48 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642784
- Tue Feb 21, 2017 3:49 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642784
Re: Post All Chemistry Jokes Here
You know what's exciting?
Electrons moving to higher sub shells
Electrons moving to higher sub shells
- 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: 610
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.
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.
- Sun Feb 12, 2017 11:41 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3642784
- 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: 652
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...
- Sun Jan 29, 2017 8:28 pm
- Forum: Calculating Work of Expansion
- Topic: max amount of work
- Replies: 4
- Views: 1069
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.
Thanks in advance.
- Thu Jan 19, 2017 8:34 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Another "work" definition? [ENDORSED]
- Replies: 1
- Views: 569
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...
- Sun Jan 15, 2017 8:51 pm
- Forum: Phase Changes & Related Calculations
- Topic: Triple Point
- Replies: 3
- Views: 772
Re: Triple Point
Yes, the triple point occurs for other molecules such as cyclohexane.