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AQA AS Chemistry 7404/1 and 7404/2 - 27th May 2016 and 10th June 2016

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Reply 320

haes

There was a percentage yield question??

Reply 321

studenttsxz

There was a differences in mass spec question??

Reply 322

Amindd

Original post by haes

There was a percentage yield question??

I dont even know i gussed the seconf half

Reply 323

haes

Guys isn't this the AS thread??
How many s.f did you put the mass of ammonia as??? I put it as one because the temperature was 300K, but everything else was in 3sf so i didn't know which one to pick??

Reply 324

Asad_2015

Bf3 dipole strongest,
1:4 ratio of hydrogen
Cro7- agent
Decrease ionisation down group 2
H2 molecules was 1.81 *10^24
The acceleration of k.e due to mass difference
All multiple choice answer I can remeber

Reply 325

moshe015

A lot of those are wrong

Posted from TSR Mobile

Reply 326

tajtsracc

Original post by haes

What was your answer for the first part? I had like 7 x10^-1?

Reply 327

metrize

3 molecular ions peak for the bromine abundance graph

Reply 328

Asad_2015

Original post by moshe015

A lot of those are wrong

Posted from TSR Mobile

What myn 😖

Reply 329

ogu01

Original post by haes

There was a percentage yield question??

I don't think so, that may have been on the CHEM1 paper

Original post by studenttsxz

There was a differences in mass spec question??

There was a mass spec question but i can't remember anything on 'differences' between mass specs

Reply 330

Asad_2015

Original post by metrize

3 molecular ions peak for the bromine abundance graph

2 at 25, 1 at 50

Reply 331

metrize

Original post by Asad_2015

2 at 25, 1 at 50

Yep i got that, think noone else i know got it, they just put 2 peaks at 79, 81

Reply 332

haes

Original post by tajtsracc

What was your answer for the first part? I had like 7 x10^-1?

0.7! So same thing!!!!
Do you think the answer was to 1sf because a lot of people are telling me it was to 3

Reply 333

ogu01

Original post by metrize

3 molecular ions peak for the bromine abundance graph

Yeah, first peak and last peak at 25% abundance and middle peak at 50%

Reply 334

Asad_2015

Original post by metrize

Yep i got that, think noone else i know got it, they just put 2 peaks at 79, 81

Yes cause u can have 79,81 or 81,79

Reply 335

thompsonnn

That was the worst Chemistry paper I've seen, I literally can't believe they made it so bad. What did you put as the compound that had the ions with charges of -2 and +3 with the same Mr of argon?

Reply 336

haes

Original post by thompsonnn

That was the worst Chemistry paper I've seen, I literally can't believe they made it so bad. What did you put as the compound that had the ions with charges of -2 and +3 with the same Mr of argon?