The Legend

I hope I got a 700+. It felt easier then October. =)

soumyamurag

fastest rate of diffusion ?
H2?

doctor92

I put H2 for the effusion rate one
.

bonduck

yeah h2

I got 2 wrong so far, 0 unanswered

Kallistos

fastest rate of diffusion ?
H2?

yeah, H2 was the "smallest" out of all the choices so it zips around the fastest. (not a very chemistry intense explanation, but I'm 99% it's correct)

soumyamurag

do u rmbr the one with Al3+..i think it was asking what compound it would make?

bonduck

or an alternative explanation to the "zipping around fastest" would just be grahams law of effusion

doctor92

Does anyone remember the question with the endothermic rxn and they asked what you would do to increase the concentration of something on the right side of the equation? I think I screwed it up. FML.

bonduck

i think i put "raise the temperature"

soumyamurag

i put raise the temprature coz it was an endothermic reaction..so putting more heat means it would create more product

RondoMaiEggo

I agree with BonDuck, I think water is right. A sieve implies "no water," and since sand can be the same particle size as KI, how would it be separated? What's the size of the sieve? If sand and KI are the same size, KI wouldn't be isolated at all.

On the other hand, with water, the KI would be dissolved and hence "separated" in a sense from the iron and sand. KI was chosen because you're supposed to know it's soluble--otherwise, a generic compound would be chosen.

And because I'm black, and we live in a society that is run by a black man, I'm right.

QED. Electric potential.

powerbomb

Does anyone remember the question where it asked which is an example of exothermic reaction?

and the choices were condensation, adding something to a dilute acid, etc...

and the one about how much Al reacts with excess sulfur?

bonduck

powerbomb: are you sure it was asking for an exothermic reaction? somehow i recall a question asking which was an endothermic reaction..?

because i remember the choices being something like:
adding acid to water? something? (exothermic)
condensation (exothermic)
combustion (exothermic)
something (s) --> something (g) (endothermic)
something else

QSCXQQ

Yeah, the question was asking which was endothermic, and the answer was the one which had a solid as a reactant and gas as a product.
I think it was CO2(s) --> CO2(g).

Also, I only remember filling out 2-3 T/T/CEs....

stix2400

yeah it was the one going from solid to gas