Search found 8 matches

by 204667573
Fri Feb 19, 2016 4:55 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: reaction order
Replies: 3
Views: 428

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.
by 204667573
Fri Feb 19, 2016 4:49 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1123617

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!"
by 204667573
Sat Feb 06, 2016 1:27 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Arranging molar entroy
Replies: 1
Views: 237

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...
by 204667573
Mon Jan 25, 2016 6:06 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous Reactions
Replies: 1
Views: 200

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...
by 204667573
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: 191

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 ...
by 204667573
Fri Jan 15, 2016 12:09 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: First Law of Thermodynamics
Replies: 1
Views: 260

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 ...
by 204667573
Fri Jan 08, 2016 3:30 pm
Forum: Phase Changes & Related Calculations
Topic: State Property
Replies: 2
Views: 304

State Property

Why does heat have to be under constant pressure for it to be a state property?
by 204667573
Fri Jan 08, 2016 3:30 pm
Forum: Phase Changes & Related Calculations
Topic: State Property
Replies: 3
Views: 519

State Property

Why does heat have to be under constant pressure for it to be a state property?

Go to advanced search