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AQA GCSE Combined Science Paper 2 Higher Tier (8464/C/2H) -13th June 2023 [Exam Chat]

Reply 40

M4teri4IGworI

4

what did everyone get for the two reasons why crude oil wasn't a formulation??

Reply 41

FFFFFWR

5

what did people write for the 3 mark on why Rf value changes with chromotography paper?

Reply 42

Nsjsbs

2

Original post

by fruitboots123

what did you guys get for the moles question?

which one was the moles one

Reply 43

Nsjsbs

2

Original post

by M4teri4IGworI

what did everyone get for the two reasons why crude oil wasn't a formulation??

put it was naturally made as opposed to man-made formulations
doesn't serve a specific purpose/function or smth abt its uses

Reply 44

M4teri4IGworI

4

Original post

by Nsjsbs

put it was naturally made as opposed to man-made formulations
doesn't serve a specific purpose/function or smth abt its uses

okay, thank you!

Reply 45

RL Greninja

Original post

by FFFFFWR

what did people write for the 3 mark on why Rf value changes with chromotography paper?

It's to do with how attracted they were to the paper

Reply 46

PRanger101

7

Original post

by User_Fish

How did everyone find it? I just didn't know what to write for that 2 marker about how concentration wouldn't effect the equilibrium

If the reaction is in dynamic equilibrium, the rate of forward reaction equals the rate of backward reaction in a closed system. As a result, the volume of reactants and products will stay constant, so the concentration will therefore also stay constant (concentration = g/vol or mol/vol).

Reply 47

mistycheddar

Original post

by fruitboots123

what did you guys get for the moles question?

There was a moles question?? Which one was it?

Reply 48

lavishmuslimah06

11

Original post

by fruitboots123

what did you guys get for the moles question?

There was a moles qs? I don’t really remember it?

Reply 49

NoobyBlockington

7

Original post

by FFFFFWR

what did people write for the 3 mark on why Rf value changes with chromotography paper?

I just waffled about affinity to the stationary phase, not sure how you'd get all 3 marks though.

Reply 50

kmody4398

5

Original post

by NoobyBlockington

I just waffled about affinity to the stationary phase, not sure how you'd get all 3 marks though.

I said:

the stationary phase changes
the dye now has a different force of attraction to the stationary phase
the dye will now move up the paper at a different rate, and therefore a different distance

just praying for a mark at least

Reply 51

alim2rs3

1

Original post

by FFFFFWR

what did people write for the 3 mark on why Rf value changes with chromotography paper?

well it said to use the table so i just talked about how the dye length changing leads to a change in the rf value

Reply 52

kmody4398

5

Original post

by User_Fish

How did everyone find it? I just didn't know what to write for that 2 marker about how concentration wouldn't effect the equilibrium

Rate of forward reaction = rate of reverse reaction

products converted to reactants at same rate as reactants to product

no overall change in the amount of reactants and product present

Reply 53

sagalh074

Original post

by williamdouglas

did everyone get 0.313 for the last question?
0.9 for the Rf value?
0.31 for the question asking for X?

i got 0.250 for the last one

Reply 54

meganm_b07

3

Original post

by williamdouglas

did everyone get 0.313 for the last question?
0.9 for the Rf value?
0.31 for the question asking for X?

0.9 for rf value
and 0.301 for last question
and 0.31 asking for x

Reply 55

FFFFFWR

5

For the tick box question about like alcohol and carboxylic acids - can anyone remember what the question was? I put oxidising agent? It might have been water? Help!?

Reply 56

da1708

3

Such a good exam!
Forgot to do 3 s.f. because I forgot the numbers after 0 need to be 3, oh well :/ only lost 1 mark that I know of. Got 0.10 but it would've been 0.096 if I understood it agh.
Also, the equilibrium one confused me so much. I said it stays the same because it didn't specify whether the forward/reverse reaction was exothermic or endothermic. So I thought the equilibrium position would stay the same.
Defo got 0.9 for Rf values.
Can't remember what I got for the X value someone will have to remind me of the numbers (if they remember) but I did the inverse of finding the mean.
Loved Q2 Q3 and kinda liked Q5 also.
Where did the oxides of nitrogen come from?

Reply 57

PRanger101

7

Original post

by FFFFFWR

For the tick box question about like alcohol and carboxylic acids - can anyone remember what the question was? I put oxidising agent? It might have been water? Help!?

Oxidising agent is correct. The question was what is needed to change ethanol into ethanoic acid. I Don’t remember the different options but ur right

Reply 58

Nsjsbs

2

Original post

by da1708

Such a good exam!
Forgot to do 3 s.f. because I forgot the numbers after 0 need to be 3, oh well :/ only lost 1 mark that I know of. Got 0.10 but it would've been 0.096 if I understood it agh.
Also, the equilibrium one confused me so much. I said it stays the same because it didn't specify whether the forward/reverse reaction was exothermic or endothermic. So I thought the equilibrium position would stay the same.
Defo got 0.9 for Rf values.
Can't remember what I got for the X value someone will have to remind me of the numbers (if they remember) but I did the inverse of finding the mean.
Loved Q2 Q3 and kinda liked Q5 also.
Where did the oxides of nitrogen come from?

put the surrounding atmosphere
dk if its right tho

(edited 2 years ago)

Reply 59

rosieburton123

1

(Original post by da1708)Such a good exam!
Forgot to do 3 s.f. because I forgot the numbers after 0 need to be 3, oh well :/ only lost 1 mark that I know of. Got 0.10 but it would've been 0.096 if I understood it agh.
Also, the equilibrium one confused me so much. I said it stays the same because it didn't specify whether the forward/reverse reaction was exothermic or endothermic. So I thought the equilibrium position would stay the same.
Defo got 0.9 for Rf values.
Can't remember what I got for the X value someone will have to remind me of the numbers (if they remember) but I did the inverse of finding the mean.
Loved Q2 Q3 and kinda liked Q5 also.
Where did the oxides of nitrogen come from?

i said the air

AQA GCSE Combined Science Paper 2 Higher Tier (8464/C/2H) -13th June 2023 [Exam Chat]

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