AQA GCSE Chemistry Paper 2 Higher Tier (8462 2H) - 13th June 2023 [Exam Chat]

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Reply 40

strikingsnakk

Wasn’t the RFM 136 as the square was 75 or am I bugging

Reply 41

TheBestOfAll

For polypeptide, it also forms Amine (amide link)

Reply 42

brojo_001

Original post by AJSM

It was the only thing I wasn't bothered to revise
I guessed some answers like the rocks
I got lucky cause I thought of limestone (Calcium hydroxide)

Isnt it calcium carbonate- i put calcium carbonate initially but changed it last second, ahhh the regret-

Reply 43

ath2

what did you guys get for the question that asked why the dynamic equilibrium isnt changed when the concentrations of the substances changes

Reply 44

Sbud

Original post by brojo_001

what did you guys get for the last question?

Sulfuric acid: Calcium phosphate and calcium sulfate

phosphoric acid: calcium phosphate (triple superphosphate)

(edited 10 months ago)

Reply 45

user1708

For the polymer woodchip question I wrote polymer then crossed it and wrote polyester.
what was the right answe r????

Reply 46

a.es.the.ti.c

Guys here are my calculations just putting them here so I can compare (tell me if you got anything different?):

First mean time taken calculation: 25 seconds
The amount of ethanol to produce the same energy as heptanol: 1.3g
The mean rate of reaction at 75 seconds: 0.0052 g/s
The maximum amount of water that could be made from 11.7g of copper sulfate: 4.225g
The amount of energy released when water is added to anhydrous copper sulfate: 7.37kJ

Oh and X was 7.2 I think??

(edited 10 months ago)

Reply 47

Harshi_789

Original post by user1708

For the polymer woodchip question I wrote polymer then crossed it and wrote polyester.
what was the right answe r????

Wasnt it composite

Reply 48

Sbud

Original post by strikingsnakk

Wasn’t the RFM 136 as the square was 75 or am I bugging

No 75 was the entire molecule so u had to add up the functional groups and subtract that from 75

Reply 49

thismyusername

what did you get for the one about the small molecule formed in polymerisation

Reply 50

Sbud

Original post by user1708

For the polymer woodchip question I wrote polymer then crossed it and wrote polyester.
what was the right answe r????

Composites

Reply 51

a.es.the.ti.c

Original post by Sbud

Sulfuric acid: Calcium phosphate and calcium sulfate

phosphoric acid: calcium phosphate (triple superphosphate)

I put single superphosphate and triple superphosphate that's the same thing right?

Reply 52

user1708

Original post by Harshi_789

Wasnt it composite

idk I only briefly went over polymers I spend more time revising npk stuff

Reply 53

Sbud

Original post by a.es.the.ti.c

Guys here are my calculations just putting them here so I can compare (tell me if you got anything different?):

First mean time taken calculation: 25 seconds
The amount of ethanol to produce the same energy as heptanol: 1.3g
The mean rate of reaction at 75 seconds: 0.0052 g/s
The maximum amount of water that could be made from 11.7g of (forgot substance name): 4.225 (grams I think?)
The amount of energy released when water is added to anhydrous copper sulfate: 7.37kJ

Oh and X was 7.2 I think??

I got all of those

Reply 54

alpallol

Original post by a.es.the.ti.c

Guys here are my calculations just putting them here so I can compare (tell me if you got anything different?):

First mean time taken calculation: 25 seconds
The amount of ethanol to produce the same energy as heptanol: 1.3g
The mean rate of reaction at 75 seconds: 0.0052 g/s
The maximum amount of water that could be made from 11.7g of (forgot substance name): 4.225 (grams I think?)
The amount of energy released when water is added to anhydrous copper sulfate: 7.37kJ

Oh and X was 7.2 I think??

Yep got them all