Search found 8 matches

by Geovanni_Suarez_3A
Sun Mar 19, 2017 9:13 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018381

Re: Post All Chemistry Jokes Here

I ran out of chemistry jokes... I should ZINC of a new one.
by Geovanni_Suarez_3A
Sun Feb 19, 2017 10:34 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018381

Re: Post All Chemistry Jokes Here

How are oxidation-reduction reactions different than a clothing store?...

At the clothing store, when the price is reduced, it doesn't gain anything.
by Geovanni_Suarez_3A
Sun Feb 12, 2017 11:06 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy at 0k
Replies: 1
Views: 194

Entropy at 0k

Hello,
I want to clarify why molecules differ in entropy when they are at 0k? We had a question like this on the quiz and I thought the molecules had no entropy because there was no movement at 0k and because of the third law of thermodynamics? Please explain. Thank you in advance.
by Geovanni_Suarez_3A
Sun Feb 05, 2017 11:56 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Porous disk versus salt bridge
Replies: 1
Views: 143

Porous disk versus salt bridge

Hello,

I was wondering if theres a difference between using a porous disk or a salt bridge in terms of their function in the galvanic cell? Also if there is should we know when we should be using one or the other when drawing the galvanic cell.

Thank you in advance.
by Geovanni_Suarez_3A
Sun Jan 29, 2017 10:19 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Homework Problem 8.63
Replies: 1
Views: 371

Re: Homework Problem 8.63

I believe this problem was a typo in the book and used -417.5 kj/mol as the enthalpy of formation for K2S(aq) instead of -471.5 kj/mol (which is what Appendix 2A says). I got the same answer you did.
by Geovanni_Suarez_3A
Sun Jan 22, 2017 11:17 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Exercise 8.41
Replies: 2
Views: 303

Re: Exercise 8.41

Exercises 8.21 and 8.41 are similar except in exercise 8.41 the ice is going through a phase change so you have to calculate the heat required for that to occur (hence using the enthalpy of fusion) along with the heat calculated by using (mass x specific heat x change in temperature) equation. In 8....

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