AQA GCSE Chemistry - C2 and C3 15th May

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Does anyone have any idea if you can write your answers in standard form on the physics exam?
For example if I worked out an equation like 1/2x1200x5000^2 and the answer was 1.5x10^10J could I leave it at that, or is converting the answer to an ordinary number required?

Reply 1121

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Original post by CurleysWife

If it says kJ then you have to use kJ.

If not, then it should be allowed.

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Reply 1122

elizabethn

What did people put for the six marker on the unit 3????!! it wasnt what i was expecting

Reply 1123

tanyapotter

Original post by elizabethn

What did people put for the six marker on the unit 3????!! it wasnt what i was expecting

just how you carry out calorimetry basically: weighing the fuel and water and temperature before the experiment, heating the water and then weighing them again. i also added a couple of lines on repeating the experiment and taking average readings in the hope that it would get me a mark or two~

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Reply 1124

ebrady

Original post by MATHSPOW!!

Dying for A* overall but ****ed up so bad.. Like I need the boundaries to be like 39 for A*... Please !

I have the same problem, but I messed up chemistry instead. :/ Like, I overcomplicated the questions so much...it annoyed me because I know for a fact I can get A*s, I just messed up on the day.

Maybe you'll get enough method marks for an A*. Even if you don't get it "right" but still put relevant info (like on the higher) markers, they'll probably award marks. We'll just have to see on the day. Also, we have core to go yet! (well, I do.) you could well average an A*, especially if you have a good ISA grade.

(edited 9 years ago)

Reply 1125

georgie1997

Original post by tanyapotter

oh, sorry!! really? because hopefully they'll apply it to that damned question on magnesium ions in the B2 paper

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Well if you talk about the wrong structure in a substance (like diamond) then they usually allow 1 mark for it, so I'm praying they allow me one for saying hydrogen haha. Oh god yes I know how awful was the biology paper, I felt so screwed over by aqa, it hardly involved any actual 'science'

Reply 1126

georgie1997

For the dot and cross diagram, I did all crosses.... But I don't think it specified what to use, will I still get full marks ?

Reply 1127

Dneep

The B2 paper was unimaginably not what anyone expected! Hopefully the grade boundaries will be lower and therefore, we can hopefully get A* overall!

Reply 1128

tomroberts12

What did you put for why silver was used in the filter, i said to kill bacteria in it?

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Reply 1129

S.Ahmad

Original post by tomroberts12

What did you put for why silver was used in the filter, i said to kill bacteria in it?

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Yup, prevents the growth of bacteria and also kills them.

Reply 1130

Clo_Bo

Original post by majmuh24

Yep same, takes a lot of energy to evaporate the water which costs money.

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How many marks was this question?

Reply 1131

tomroberts12

Original post by S.Ahmad

Yup, prevents the growth of bacteria and also kills them.

In the filter or water?

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Reply 1132

S.Ahmad

Original post by tomroberts12

In the filter or water?

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Both

Reply 1133

xoflower

Original post by majmuh24

Yep same, takes a lot of energy to evaporate the water which costs money.

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So wait, what was the question and what was the answer?

...? I said that it costs a lot of money as it needs lots of energy

Reply 1134

zali249

Guys please what was the question about distillation - advantage or disadvantage?

Reply 1135

tomroberts12

Original post by zali249

Guys please what was the question about distillation - advantage or disadvantage?

There was no advantage to it, the disadvantage was: distillation requires a lot of energy hence money

Reply 1136

S.Ahmad

Original post by tomroberts12

There was no advantage to it, the disadvantage was: distillation requires a lot of energy hence money

Also there are many steps for Distillation, therefore its expensive as well, such as heating.

Reply 1137

Lokiofasgard

Original post by zali249

Guys please what was the question about distillation - advantage or disadvantage?

It was just generally that distillation is expensive- I suppose that you would both go into how the process how the process has many steps and also that large amounts of water would need to be distilled- using a lot of energy.

Reply 1138

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Original post by xoflower

So wait, what was the question and what was the answer?...? I said that it costs a lot of money as it needs lots of energy

Question - Why is distillation not good in economic terms? (or something like that)

Answer - Lots of money as lots of energy required to evaporate water, lots of steps (recondensing etc)