Search found 8 matches
- Fri Feb 19, 2016 4:55 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: reaction order
- Replies: 3
- Views: 769
Re: reaction order
No, for zero order the rate constant, k always has the units mole L^-1 sec^-1, first order k has the units sec^-1, and second order k has the units L mole^-1 sec^-1.
- Fri Feb 19, 2016 4:49 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 4096254
Re: Chemistry Jokes
Two atoms are walking down the street and they run in to each other. One says to the other, "Are you all right?" "No, I lost an electron!" "Are you sure?" "Yeah, I'm positive!"
- Sat Feb 06, 2016 1:27 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Arranging molar entroy
- Replies: 1
- Views: 401
Arranging molar entroy
I am struggling with a question in regards to arranging substances in order of increasing standard molar entropy: CHF3(g), CF4(g), CH3F(g), and CH2F2(g) I know that Sgas >> Sliquid > Ssolid, but since they are all gases you need to look at the complexity, number of bond, and number of molecules in e...
- Mon Jan 25, 2016 6:06 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneous Reactions
- Replies: 1
- Views: 341
Spontaneous Reactions
I am a little confused on idea of a reaction happening spontaneously. I know that it must have a negative value for the change in Gibbs Free Energy, however, what does that conceptually mean? For example, I read that ice melting at a temperature above zero degrees celsius is a spontaneous process. T...
- Sat Jan 23, 2016 11:30 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.93 - Integrated Exercises
- Replies: 1
- Views: 323
8.93 - Integrated Exercises
I am extremely confused on certain parts of this question. Overall are we simply supposed to know that the equation for C6H6(l) is C6H6+15/2 O2(g) --> 6CO2(g)+3H20(g)? For part (a) they calculated that the change in number of moles is -1.5, but the way I did it is (3+6)-(1+15/2) = 0.5 not -1.5.. Am ...
- Fri Jan 15, 2016 12:09 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: First Law of Thermodynamics
- Replies: 1
- Views: 447
First Law of Thermodynamics
In the course reader, Professor Lavelle writes this quote "since the universe is an isolated system: the energy of the universe is constant" after describing the First Law of Thermodynamics to be conservation of energy. I am pretty lost on what Professor Lavelle means by this? Does anyone ...
- Fri Jan 08, 2016 3:30 pm
- Forum: Phase Changes & Related Calculations
- Topic: State Property
- Replies: 2
- Views: 465
State Property
Why does heat have to be under constant pressure for it to be a state property?
- Fri Jan 08, 2016 3:30 pm
- Forum: Phase Changes & Related Calculations
- Topic: State Property
- Replies: 3
- Views: 772
State Property
Why does heat have to be under constant pressure for it to be a state property?