AQA GCSE Chemistry - C2 & C3 (14th May 2015)

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Yeah there is! Sorry I missed that, thank you!

I'm pretty sure there's more problems than just being unsafe like cost as well. Are there any more problems?

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Reply 81

Jules12345

Original post by DrNippleson

I want the haber process for a 6 mark, nice and easy. It was a 4/5 mark on last years test so fingers crossed, AQA tend to move 4/5 marks into 6 marks.

Is that for unit 2 or 3??

Reply 82

maxjackson5

Original post by Jules12345

Is that for unit 2 or 3??

Not sure about unit 3, but it can definitely come up in unit 2

Reply 83

neil20143

Original post by Jules12345

Is that for unit 2 or 3??

The Haber Process is Unit 3, not Unit 2 :smile:

Reply 84

Jules12345

Original post by maxjackson5

Not sure about unit 3, but it can definitely come up in unit 2

Are you sure?!

Reply 85

pollyy

Original post by Nai18

I'm pretty sure there's more problems than just being unsafe like cost as well. Are there any more problems?

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Yeah I think I mentioned the cost of the plant would be too high, but also a lot of energy is required to provide high pressures, so that in itself is expensive too!

Reply 86

Nai18

For unit 3 chemistry, I think the 6 mark questions could be on hard water or it may be on describe how to do all ion tests or maybe a titration experiment

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Reply 87

Nai18

Also, can anyone post key points about the period table from Newlands and Mendeleev please?

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Reply 88

Jules12345

Possible six marker for c6 - compare differences between thermosoftening and thermosetting polymers?? Or how to make salts

Reply 89

Nai18

When you say salts, do you mean like forming crystals after the salt is made?

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Reply 90

Jules12345

Original post by Nai18

When you say salts, do you mean like forming crystals after the salt is made?

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Maybe just like how to do the experiment of making a certain salt

Reply 91

bellaap

I find emperical formulas confusing can anyone help? Also anyone got predictions for c3?

Reply 92

maxjackson5

Original post by bellaap

I find emperical formulas confusing can anyone help? Also anyone got predictions for c3?

1) Find the Ar's for the elements involved
2) Divide each mass/percentage by the Ar of its element
3)Divide each answer by the smallest answer that you just got
4)Put them into the correct formula (i.e if you had 2 iron and 3 oxygen, the formula would be Fe203).

Hope this helped! If you're struggling just tell me which part you don't understand and I'll message you back

Reply 93

Louisbirch

Has anyone got any good tips/acronyms/ways of remembering the ion tests?

Reply 94

Mina_

Original post by bellaap

I find emperical formulas confusing can anyone help? Also anyone got predictions for c3?

My teacher made this up and its really helpful:

Remember the word EMADR

Element:
Mass:
Atomic mass:
Divide:
Ratio (divide by smallest):

Reply 95

fabsafxo

im so blood nervous for it
we don't even have study leave so its like ugh when am I gonna study???!!!

Reply 96

brozza981

Original post by Louisbirch

Has anyone got any good tips/acronyms/ways of remembering the ion tests?

Positive Ions Flame Test:
PoP CaR BaG LiC SoY
Potassium - Purple,
Calcium - Red,
Barium - Green,
Lithium - Crimson,
Sodium - Yellow!

Reply 97

pollyy

Hi would anyone be able to explain to me how to do this question from the June 2013 C2 paper?

Write the formula of ammonium sulfate using the ion formulas on the data sheet.

The answer is (NH4)2SO4 but I can't work out how to get to that! Thank you!