Did anyone actually used the information of 1 mol of the gas occupies a volume of 0.04 something in the question? I didn't use it at all. For the first part I just did (p1 x V1 / T1) = (p2 x V2 / T2). The next part I just did a simple deduction. I can't remember what I did for the rest.

Reply 823

YouManRollThafe

1

What did you guys do for the 4 marker that was like if the luminosity of a star is constantly changing, what are the implications of its distance to earth

Reply 824

Haleema567

2

Original post by kingaaran

I got 0.066 moles I think. You had to work out the constant of proportionality between P, V and T, use the formula to work out the new volume in the first part and divide the constant by 8.31 to get the number of moles in the second

Could it not be 0.067 because they gave you the volume it occupied for 1 mole, so you do the volume initially divided by the volume of 1 mole?

Reply 825

Mango Milkshake

2

Original post by FireBLue97

1.8x10^4 -1.5510x10^4 gives 2.1x10^3
next part 2.5x10^4

what was he question?

Reply 826

Mango Milkshake

2

Original post by CourtlyCanter

Did anyone actually used the information of 1 mol of the gas occupies a volume of 0.04 something in the question? I didn't use it at all. For the first part I just did (p1 x V1 / T1) = (p2 x V2 / T2). The next part I just did a simple deduction. I can't remember what I did for the rest.

yes you needed it to work out density

Reply 827

Mattematics

5

Original post by Haleema567

Could it not be 0.067 because they gave you the volume it occupied for 1 mole, so you do the volume initially divided by the volume of 1 mole?

Yes you could do that

Reply 828

-jordan-

5

Original post by CourtlyCanter

Did anyone actually used the information of 1 mol of the gas occupies a volume of 0.04 something in the question? I didn't use it at all. For the first part I just did (p1 x V1 / T1) = (p2 x V2 / T2). The next part I just did a simple deduction. I can't remember what I did for the rest.

I did, both would give the same answer.

Reply 829

CourtlyCanter

8

Original post by -jordan-

I did, both would give the same answer.

So are you saying I could have ignored the 1 mol of the gas occupies a volume of 0.04 something in the question and still work out the answers for every part of the question?

Reply 830

username1884583

6

Could someone if they have the paper please upload photos of it. Its the only way to actually check what the answers are rather than everyone guessing.

Reply 831

-jordan-

5

Original post by CourtlyCanter

So are you saying I could have ignored the 1 mol of the gas occupies a volume of 0.04 something in the question and still work out the answers for every part of the question?

Yeah. For Boyle's law to apply the number of moles is constant.

You could have used that knowledge to quickly work out the mols by doing (1/0.04)*<actual volume of the gas>

Alternatively you could use the ideal gas equations to find it.

Reply 832

-jordan-

5

Original post by Mattematics

No, because you needed it to work out the mass to get the density.

You didn't. You could work out the number of moles using pV=nRT and it would give you the same answer.

Reply 833

Yo12345

2

Original post by kingaaran

got that

Got something like that. Got theta= 42

Posted from TSR Mobile

Reply 834

username1884583

6

.Could someone if they have the paper please upload photos of it. Its the only way to actually check what the answers are rather than everyone guessing . ...

Reply 835

boyyo

6

will there be any model answers for section A??

Also for the questioon that said to right two thinngs to make the sentence about volume being inversely proportionl to pressure; did anyone say mass of the gas? I couldnt think of another one so thats what i put down

Reply 836

TheLifelessRobot

7

Original post by WashingPowder

, I think alot of people when calculating specific charge are forgetting you cannot caluclate v using ev= 1/2 mv^2 , because this would require you knowing the electrons charge/ mass which avoids the whole point of calculating specific charge.

You can do it like this too, the blue v is velocity, the black V is voltage. You get the velocity from this and you just go from there.

Is anyone going to make an unofficial mark scheme for the nuclear paper?

Reply 838

Mattematics

5

Original post by boyyo

will there be any model answers for section A??

Also for the questioon that said to right two thinngs to make the sentence about volume being inversely proportionl to pressure; did anyone say mass of the gas? I couldnt think of another one so thats what i put down