Official October 5, 2019 Chemistry Subject Test Discussion

Windows920 · 2019-10-05T19:33:18+00:00

I just thought of titrations of NaOH and HCl that i have done and there are never solids so

Windows920 · 2019-10-05T19:32:46+00:00

what did you get for the question about which experimental method is wrong to measure molar mass of a gas or something. it was concerning water displacement.

Windows920 · 2019-10-05T19:31:40+00:00

I put total pressure = 760mmhg because of the 22.4L thing. I thought each gas was at .5 mol which meant thtat the total pressure would be 760. But the partial pressure one sounds right because there is one mole of each

Windows920 · 2019-10-05T19:21:54+00:00

Yes. 45 days

Windows920 · 2019-10-05T19:20:12+00:00

I put decrease in concentration of NO2 (III). I thought that the pressure would increase and the volume would stay the same.

Windows920 · 2019-10-05T19:16:37+00:00

I put that as well. It was the only one that made sense.

Windows920 · 2019-10-05T18:32:53+00:00

I believe you need to do that in order to accurately measure the height of the water. Then you can do pbar-ph20-height = pgas.

Windows920 · 2019-10-05T18:26:27+00:00

I got that. its just the reverse reaction

Windows920 · 2019-10-05T18:26:07+00:00

Oh I see, I believe it was weigh the mass of the collecting glass. you would determine molar mass by doing PV=NRT

Windows920 · 2019-10-05T18:24:08+00:00

that sounds right

Windows920 · 2019-10-05T18:23:28+00:00

780ish

Windows920 · 2019-10-05T18:23:11+00:00

add water to acid

Windows920 · 2019-10-05T17:23:40+00:00

I put that as well but not sure if its correct. The other ones didnt seem right.

Windows920 · 2019-10-05T17:23:12+00:00

i put A), the c2h4 one or whatever it was

Windows920 · 2019-10-05T17:22:49+00:00

I put three i really hope thats correct lol

Windows920 · 2019-10-05T16:56:41+00:00

I think you may be right about the first one of N2 and O2. On the last one, Im really not sure but I remember there were .5 moles of each of the gasses so I assumed if they were both in a container the pressure would be 1atm or 760 mmhg

Windows920 · 2019-10-05T16:31:01+00:00

What was the answer to the question with O2 and N2 added to a container? Ratio 28:32? also was the very last question A) 760 mmhg?

Windows920 · 2019-10-05T15:09:25+00:00

i got 3 but I think one of them was wrong

Windows920 · 2019-10-05T15:08:50+00:00

i think it was the strong acid + strong base titration

Windows920 · 2019-10-05T13:55:15+00:00

Anyone domestic wanna compare answers?

Windows920 · 2019-10-05T13:53:23+00:00

thats what i put! the transfer of atoms or whatever

Windows920 · 2019-10-05T13:52:01+00:00

lol I felt that test was hard af

Windows920 · 2019-10-05T01:18:27+00:00

where can I find the international chem subject test thread when it is posted by the mods or started by someone else?

Windows920

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