CHEMISTRY COMMUNITY

Matt Goff 1F

How do we use E and Z in cycloalkenes with multiple double bonds? What's the quickest way to determine priority?

Matt Goff 1F

Can use either

Matt Goff 1F

We are trying to see if the reaction mechanism proposed accurately leads us to the given observed rate of k[NO]^2[O2]. 1/2d[NO2]/dt comes from looking at the balanced reaction on the first line of this page and writing out the rate in terms of the formation of NO2. You do that the same way it's done...

Matt Goff 1F

Water vapor will not necessarily turn to liquid water when brought back down to room temp, which is the tricky part of this question. If you look at a phase diagram for water you can see that at a low enough pressure, water can be in the vapor phase in the whole range of temps for this question. Log...

Matt Goff 1F

I just did it your way and got K = 9.2 x 10^-72, which is the same as when I used \Delta G=-RTlnK , which is just a different way to do it. It says at the bottom of the page though they accepted 9.2 x 10^-72 as well as 1.0 x 10^-71 for the answer for K, so you should be good as long as you put the n...

Matt Goff 1F

I think they meant the 2013 Winter midterm question 7. The original equation is: Mn^2^+ (aq) + Br_2(l) \rightarrow MnO_4^-(aq) + Br^-(aq) And the half rxns are: MnO_4(aq) + 8H^+ + 5e^- \rightarrow Mn^2^+ (aq) + 4H_2O(l) , E^0=+1.49V Br_2(l&...

Matt Goff 1F

A constant pressure calorimeter gives enthalpy values (as the definition of enthalpy is heat at constant pressure). A constant volume calorimeter is a bomb calorimeter. You can remember this because as the volume stays constant and a reaction (igniting oxygen) takes place, the pressure increases ins...

Matt Goff 1F

"Is it because these functions are state functions that we can use the final and initial for the change of them (delta)?"

Yes. For something like work, which is not a state function, the path does matter so a less meaningful value is obtained from the final-initial calculation.

Matt Goff 1F

I believe this is because the entropy of vaporization is a ratio (between the enthalpy of vaporization and the boiling temperature). You can find a lot on it if you look up Trouton's rule. Hope this helps!

Matt Goff 1F

Temperature is defined as the average kinetic energy, and this does not change as ice melts, for example. However, breaking the bonds in ice (H-bonds) requires heat to be added. I think the part confusing you is looking at the flat part as constituting more "time," when really it's just a ...

CHEMISTRY COMMUNITY

Search found 10 matches

Re: Cis and Trans

Re: winter 2015 final 5A

Re: pre equilibrium approach (question about something in the coursereader)

Re: 2015 Midterm Q4&5 part D

Re: Winter 2013 Midterm #7: Which Nernst Equation to Use?

Re: Midterm 2013 #7

Re: Open, Closed, and Isolated Systems

Re: Significance of State Functions

Re: Entropy and phase changes

Re: Phase Changes