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Aqa Combined Science Chemistry Paper 2 Unofficial Mark Scheme

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Original post by Soroh Smith
Was the answer 96 for the surface area?


No it was 24
Original post by RobEaster
I believe it was 1.815, or 1.815 * 10:

Mole = Mass (in grams) / Mr

Mass = 14.52kg, 1452g

Mr = 80

Mole = 1452/80 = 18.15


No that’s incorrect there are 1000g In a Kg but the rest was correct just a silly mistake
Reply 22
Avatar for Y0U54F
Y0U54F
3
Original post by Ibrahim Osman56
No that’s incorrect there are 1000g In a Kg but the rest was correct just a silly mistake


What did you get for the chloride test one “?
Original post by RobEaster
I believe it was 18.15, or 1.815 * 10:

Mole = Mass (in grams) / Mr

Mass = 14.52kg, 1452g

Mr = 80

Mole = 1452/80 = 18.15


First its *1000 to make it grams so 14520g

You had to put it in standard form to 2 S.f

so its 1.8*10^2
(edited 5 years ago)
Original post by Y0U54F
What did you get for the chloride test one “?


Use damp litmus paper and should turn white as it gets bleached
How many marks was this question?
Original post by Ibrahim Osman56
No it was 24


How many marks was this question?
Reply 27
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bvfh
12
Original post by Ibrahim Osman56
No it was 24


yh 24
Reply 28
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bvfh
12
what did you get for the one which said how can you estimate the mean rate of reaction at 5 minutes and do not include a calculation
Original post by InterMilan1908
How many marks was this question?


I think it was 2
Original post by bvfh
what did you get for the one which said how can you estimate the mean rate of reaction at 5 minutes and do not include a calculation


Simply say draw a tangent and work out gradient. Its asking for method not answer.
Original post by bvfh
what did you get for the one which said how can you estimate the mean rate of reaction at 5 minutes and do not include a calculation


I wrote u have to draw a tangent and calculate the gradient
What do you guys think the grade boundaries will be for these papers?
Original post by Fallen_Angel_
Simply say draw a tangent and work out gradient. Its asking for method not answer.


What unit did you put? I put cm^3/s at first then crossed it out and put cm/s^3
Original post by bvfh
what did you get for the one which said how can you estimate the mean rate of reaction at 5 minutes and do not include a calculation


draw a tangent at 15 seconds and work out the gradient of the tangent
Original post by Patplander
no it was 84
2x2x2 is 8
and it has 6 faces
so 8x6
is 48


The surface area would be less so...
Reply 36
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Kizzy_1
4
Original post by Patplander
no it was 84
2x2x2 is 8
and it has 6 faces
so 8x6
is 48


If you do 2x2x2 that works out the volume, to do the surface area you do 2x2 for one face, then x6 for the rest of the faces
Original post by Kizzy_1
If you do 2x2x2 that works out the volume, to do the surface area you do 2x2 for one face, then x6 for the rest of the faces


Yes that’s correct u calculated it wrong tbh that quetsion got me at first aswell with the example
Original post by Momjeans123
What unit did you put? I put cm^3/s at first then crossed it out and put cm/s^3


the first one. you cant scale time
How are mandem getting 84 for the surface area 😂😂

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