AQA GCSE Triple Chemistry 2018 Higher Paper 2 unoffical mark scheme/ exam discussion

OP

you dont draw a tangent you use the equation

mass of reactants lost/time

it was like 0.98/80

But it didnt ask for the rate of reaction up to the point, which is what you have found, it asked for the rate of reaction at a specific point, which is a tangent

Reply 81

Fabianreah99

Original post by johnthebaptist27

What did you guys get for the energy to make 2kg of cups?

I thought it was 1kg

Reply 82

char_2002

13

Original post by ZainulAli1234

Finally some one who got what i goy. I was worried

I got 0.03 so yeah thank god

Reply 83

Al.ice_

13

Original post by andrew_1702

Yours is right, but I rounded up to 121 because it asked TO GET 1kg of substance as 120 got like 989g, so I rounded upto 121 and then multiplied by 550.

I was really confused by that as well because if you used 120 it's not technically 1kg but I ended up using 120 because it looked better in standard form

Reply 84

username3708654

12

What did yous get for the rate? I got 0.0031

Also, for how ethanol made ethanoic acid? (Might have been methanol to methanol acid, idk) I put oxidising agent eg postassium dichromate, but don’t think it was right

Reply 85

char_2002

13

Original post by jsjsjsjs333

What did yous get for the rate? I got 0.0031

Also, for how ethanol made ethanoic acid? (Might have been methanol to methanol acid, idk) I put oxidising agent eg postassium dichromate, but don’t think it was right

I put oxidising agent as well and think thats the correct answer

Reply 86

HelloFromIt'sMe

9

if u use 121 cups it would be greater than 1kg
120 is just a little below

Reply 87

andrew_1702

5

Original post by johnthebaptist27

Which one was sodium ethanoate for?

The one were it said sodium and ethanol react together but i think i8'm wrong

Reply 88

nzy

17

Original post by jsjsjsjs333

What did yous get for the rate? I got 0.0031

Also, for how ethanol made ethanoic acid? (Might have been methanol to methanol acid, idk) I put oxidising agent eg postassium dichromate, but don’t think it was right

It said what 'what kind of substance' so idk, I crossed out gas and just put oxidising agent too.

Reply 89

username3708654

12

What gas was causing the mass of the mixture to decrease? The one with magnesium carbonate and an acid

Reply 90

johnthebaptist27

OP

13

Original post by Fabianreah99

I thought it was 1kg

Yh it was xD, no wonder I could get my original answer in the exam again haha

Reply 91

don134

11

Original post by andrew_1702

The one were it said sodium and ethanol react together but i think i8'm wrong

It asked for the gas which is hydrogen

Reply 92

char_2002

13

Original post by jsjsjsjs333

What gas was causing the mass of the mixture to decrease? The one with magnesium carbonate and an acid

carbon dioxide

Reply 93

Al.ice_

13

Original post by HelloFromIt'sMe

you dont draw a tangent you use the equation

mass of reactants lost/time

it was like 0.98/80

you definitely do draw a tangent, it was a four mark question, the rate constantly changes so to get it from a singular point (0.95g) you have to use a tangent 😊

Reply 94

nzy

17

Original post by jsjsjsjs333

What gas was causing the mass of the mixture to decrease? The one with magnesium carbonate and an acid

was it magnesium carbonate? In that case it was carbon dioxide, but i thought it was just magnesium ribbon so i put hydrogen

Reply 95

johnthebaptist27

OP

13

Original post by andrew_1702

The one were it said sodium and ethanol react together but i think i8'm wrong

It asked for the gas which was hydrogen I think because the reaction produces sodium ethoxide and hydrogen

Reply 96

Y2_UniMaths

19

Original post by johnthebaptist27

I got like 0.0028

I got 0.0027

Reply 97

sbalfe16

10

Original post by andrew_1702

0.0024 for the tangent, thermosetting polymers form cross links for the last question, fermentation, sulphate practical- you add barium chloride solution and if it goes white, there are sulphate ions present, formulation, sodium ethanoate, particulates, sodium ions= yellow, copper ions= green,