powerbomb

How was it?

I skipped 7, and I think I got about 4 wrong.

The T/T/CE questions weren't so bad.

stix2400

Yeah I think I got all the T/T/CE's right.

How many did T/T/CE's did you guys get anyway? I got 4 or 5...

The rest of the test was somewhat bad for me. Too much random stuff.

What was the answer to the question about the pressure of two different gases added together in a 2 L container?

And what about the one asking which gasses could be made through water displacement (or something like that)? It was one of those I, II, III questions.

And separation of KI from sand and iron?

doctor92

Water displacement I got dihydrogen and dioxygen gas. Separation of KI from sand and iron I put E(use a sieve) by process of elimination because the other ones did not make sense to me at the time. And the pressure question I put 3 atm, but my logic could very well be off. Now that I think about it I cannot even understand my thought process for that one. What did you guys get for the absolute last question?

doctor92

And I got five T/T/CE's.

stix2400

what was the last question?

I think I missed the water displacement, separation of KI ones.

Pressure I put 4 because one gas would exert 2 atm at 2 L and the other would exert 2 at 2 atm as well. Could be wrong.

I also missed the fact that CL2 has an odor.

bigcrit

I left like 20 blank. i hadnt studied much and i ran out of time at around question 55. i was really shocked because i hadn't really struggled with any question either, just took my sweet time.. =/

anyway for the one where the volumes are combined into 2L where 1L of O2 was at 4atm and like the other one I think 4L was at like 1 atm. when you combine them its partial pressures. so i calculated their pressures separately.

2L of O2 will have 2atm when expanded by a factor of 2, and 2L of the other one will have 2atm when its volume is cut in half. So combined them to get 4atm for the pressure.

doctor92

That was my initial thought, and I think it is right. I made a math error and calculated both of the pressures together as 2.5atm and rounded it to three. Real smart move. Which one did you need to know that chlorine gas has an odor? I knew that, I just do not remember when I needed to know it.

bigcrit

the odor ones really messed me up.

in an aqueous solution, does Cl2 or NH3 have an odor? what about Sugar? And does sugar ionize strongly. iwasn't sure if HCL or sugar would conduct electricity more too.

and other than Cl2 Nh3 and sugar, i think C2H3O2 was another one of the options but im not 100% sure.

stix2400

HCL conducts electricity the best (it ionizes the most because it's a strong acid).

CL2 is the one with the odor. not the others. sugar ionizes none and has no odor in pure form.
and yes there were 5 T/T/CE (don't think i missed any of those)

bigcrit

sweet i put HCL.

what about the decay, when 40K decays into 40Ar. fission or nuclear trasnformation i tihnk where the options. I thought fission meant splitting of the nuceleus hence mass would be lost from neutron loss.

stix2400

yeah i put nuclear transformation.

was the question about which was NOT oxidation reduction the last option (i think it was double replacement)?

feynman81591

@bigcrit

the example was still positron decay, so it is some type of nuclear fission. nuclear transformation was random, i think.

4 atm is correct. using a sieve is also what i got. did you guys get that carbon was the element (of the 5 given) that does conduct electricity in one of its solid forms at room temp (AKA graphite)?

bigcrit

yeah it was like AGNO3 and CACL in (aq) and that's double replacement.

stix2400

yes solid carbon conducts electricity (graphite).

Hey, the one with the Lewis structure being incomplete... what was that?

thequestionmark

That was hard!

I forgot that Bromine was liquid at room temp.

Which of those is a conductive solid at room temp? Is it carbon or sulfur?

Also to separate KI from sand + metal I would use a sieve...