## Search found 11 matches

Wed Mar 15, 2017 3:23 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 280
Views: 134577

### Re: Saying Thank You to Dr. Lavelle

Dr. Lavelle, I just want to say thank you for teaching 14B this quarter. Chemistry has always been a difficult subject for me, and I had trouble understanding many aspects of chemistry in high school. You brought an essence of clarity to the subject, and while this class was challenging, I found it ...
Tue Mar 07, 2017 4:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 19653

### Re: Quiz 3 Winter 2017

For the quiz will we have to know how to draw transition states? Or will just drawing the arrows for each step in the reaction suffice?
Sun Mar 05, 2017 3:20 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8023
Views: 1404493

### Re: Post All Chemistry Jokes Here

According to a chemist, why is the world so diverse?
Because it's made of alkynes of people!
Tue Feb 21, 2017 1:40 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Concentration vs. Time Graphs
Replies: 2
Views: 405

### Re: Concentration vs. Time Graphs

If you look at the axis of each graph you will be able to tell which reaction order it is. If the Y-axis is [A]t and the slope is negative it is a zero-order reaction. If the Y-axis is ln[A]t and the slope is negative the reaction is 1st order, and if the Y-axis is 1/[A]t and the slope is positive i...
Mon Feb 13, 2017 11:29 am
Forum: Calculating Work of Expansion
Topic: Reversible vs Irreversible
Replies: 2
Views: 384

### Re: Reversible vs Irreversible

You can generally tell if the reaction is reversible because it will be stated in the question. If the question does not state explicitly that the reaction is reversible, you should be able to tell by the variables given which equation you should be using.
Mon Feb 06, 2017 5:05 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8023
Views: 1404493

### Re: Post All Chemistry Jokes Here

Since Valentine's Day is coming up:)
I wish I was an ion so I could form an exothermic bond with you.
If you were C6, and I were H12, all we would need is the air we breathe to be sweeter than sugar.
Thu Feb 02, 2017 4:08 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Gibbs free energy for cell rxns: UNITS
Replies: 2
Views: 282

### Re: Gibbs free energy for cell rxns: UNITS

Generally speaking delta G is reported in kJ/mol, it would be better to do the quick conversion from J to kJ.
Mon Jan 30, 2017 11:13 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8023
Views: 1404493

### Re: Post All Chemistry Jokes Here

If the Silver Surfer and Iron Man team up, they'd be alloys.
Tue Jan 24, 2017 12:52 pm
Forum: Phase Changes & Related Calculations
Topic: 8.39
Replies: 3
Views: 511

### Re: 8.39

Whenever matter has to go through a phase change i.e. from a liquid to a solid or a solid to a gas, you're going to have a two step problem when calculating heat or enthalpy. This is because the temperature stays the same during the phase change while heat is being added. Once the matter goes throug...
Sun Jan 22, 2017 7:05 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Second Thermodynamics? [ENDORSED]
Replies: 2
Views: 339

### Re: Second Thermodynamics?[ENDORSED]

I believe the second law of thermodynamics has more to do with entropy while the first law of thermodynamics has more to do with enthalpy. The laws are not equations however, so specific equations having to deal with heat, work, enthalpy, and internal energy will have to be known as well as the laws.
Wed Jan 11, 2017 9:12 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: 8.3 Expansion Work Help? [ENDORSED]
Replies: 1
Views: 340

### Re: 8.3 Expansion Work Help?[ENDORSED]

An irreversible process happens when the external pressure is different from the internal pressure of the system, while a reversible process happens when the external pressure is equal to the internal pressure of the system. In a reversible process since the external and internal pressures are equal...

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