CHEMISTRY COMMUNITY

Gracie Ge 2E

the slowest step is the rate determining step.
if the slowest step includes an intermediate then you'll have to substitute it with something else (there are examples on the textbook for this)

Gracie Ge 2E

you can do something similar to the ice table (without the e though, more like icf) 2A -> B + C, 0.153M 0 0 -2x +x +x 0.034M (even if it's not in equilibrium, the reactants and products still increase/decrease with the ratio of 2:1:1.) which means x = 0.034M and 2x = 0.068M and the final concentrati...

Gracie Ge 2E

found this online.

Gracie Ge 2E

for a reaction with rate k[A]^a[B]^b, the order is simply a+b.
which means k[H2][I2] and a general k[A]^2 are both second order.

Gracie Ge 2E

isn't boltzmann's constant used to calculate entropy with the number of possible states of a molecule and the number of molecules?
rate constants and boltzmann are entirely different things.

Gracie Ge 2E

because we're using an equilibrium constant expression that includes both concentration (of the HCl) and pressure.

Gracie Ge 2E

What should you do if no one laughs at your chemistry jokes?
keep telling them until you get a reaction.

(ughhhhhhhhhhhh)

Gracie Ge 2E

you won't. unless you're given other info ([A] change and rate change or actual rate laws)

Gracie Ge 2E

you've been given one K value (Kw=10^-14) at 25C, and with the vant hoff equation you can find the other K (we'll call it K2) at 10C. here's how you do it: 1.plug in the numbers to the vant hoff equation (the temperatures have to be changed to Kelvins): ln(K2/Kw) = -58kJ/R(1/283K - 1/298K) 2. becaus...

Gracie Ge 2E

as the concentration of A increases by x, the rate of the reaction increases by x^a.
a=the reaction order of A.

Gracie Ge 2E

water is part of (aq)s so we should use it whenever using only the contents of the cell diagrams doesn't work. for 6l3d, the anode has O2(g) and H+(aq) and H2O(l). the cathode has OH-(aq), O2(g) and H2O(l). the half reactions are- anode reaction : 2H2O -> O2 + 4H+ + 4e- cathode reaction : 4e- + O2 +...

Gracie Ge 2E

i think for this problem you'll have to look at the standard reduction potentials page. the two possible reactions are Au+ + e- = Au （+1.69v） and Au3+ + 3e- = Au （+1.40v） from the reduction potentials we know that the first reaction is the cathode and the second one is the anode. so we invert the se...

Gracie Ge 2E

i think we're supposed to use Pt(s) for all reactions lacking a solid that conducts electricity. (Lavelle said during lecture that you can also use graphite, but i think we should just stick to using Pt(s) for now)

Gracie Ge 2E

for example for the reaction Fe3+(aq) + Cu(s) = Cu2+(aq) + Fe2+(aq) the oxidation reaction is Cu(s) -> Cu2+(aq) we have a zero charge on the left and a positive 2 charge on the right side, so adding 2 negatively charged electrons would balance it out. in this case it would be Cu(s) -> Cu2+(aq) + 2e-...

Gracie Ge 2E

you can find a bunch of reaction potentials for almost every reaction in appendix 2b. i guess for the problems in this chapter we'll have to make use of that all the time:)

Gracie Ge 2E

http://butane.chem.uiuc.edu/pshapley/genchem2/c6/1.html
i found this site that seems to explain the difference between galvanic/electrolytic cells pretty well.
(since we're learning galvanic cells for now and at least i was kinda confused about those two:)

Gracie Ge 2E

i think you're not supposed to use Cpm here because for the second part of the solution since it's at constant V. the constant given in the solutions also stated that 20.81 was the Cv,m of nitrogen gas, not Cp,m.
(i used 3/2*R to calculate the Cv,m and was given points as well.

Gracie Ge 2E

iphone 6 has four friends.
iphone 6s, iphone 6p, iphone 6d, iphone 6f.

Gracie Ge 2E

you can think of expansion (as in when w is negative) as the system doing something. sometimes the problems would say "system undergoes expansion" but actually it's up to you to figure out whether it's w<0 or not.

Gracie Ge 2E

the reaction will most likely not be isothermal.
(you can look at question 4C3)

Gracie Ge 2E

a photon arrives at a hotel. "do you need to check in your luggage?", the receptionist asks.
"no," the photon replies, "i'm traveling light".
(not exactly chemistry but

Gracie Ge 2E

a teacher asks three students if they can fill up an entire classroom with something. half an hour later, student A returns with a sack of flour, shuts the windows, and pours the flour all over the room. student B lights a candle and brings it into the room. student C sees this and runs. student C s...

Gracie Ge 2E

thanks Joyce!:)

Gracie Ge 2E

nacl/naoh
the base is under assault.

Gracie Ge 2E

four people meet at a tattoo store. im getting this one , the twenty year old points to a structural formula of dopamine. i wish to attain happiness. and im getting this , the forty year old points to a structural formula of diazepam. i wish to be free from stress and live in tranquility. the sixty ...

Gracie Ge 2E

what do chemists call a benzene ring with iron atoms in place of carbon atoms?
a ferrous wheel (ugh

Gracie Ge 2E

John: “Hey that ranger Argon guy, why is he wearing a crown?”

Me: “Because LOTR is a tale about Argon, his friend Boron and their adventures with Zinc, Iron, Aluminum and Mercury.”

(credit to moderngardening.tumblr.com; im sorry this is lame)

Gracie Ge 2E

It's probably a little late but I guess 5G-J (7th edition) according to the assigned homework problems... (and by the way, for chapter six i think there's quite a lot of material we're not expected to know:)

CHEMISTRY COMMUNITY

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