GCSE AQA Triple Chemistry Higher Paper 2018

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Reply 100

kirsty brown

false

Original post by Namakii

Only think it was one or two may be wrong tho. Yeah there's a bit of a debate about the answer in my school.

It was 1 mark and the answer was 5

Reply 101

serenajerhamx

Original post by RadioBloodB

Was it not Fe(S2)4 since each iron was bonded to four silicon ion pairs?

No sorry, it was definitely FS2 it’s just than when an ionic compound forms, each ion bonds with the other in all different directions (hence where the 4 pairs come from). Think the question was on Pryite and if you google is empirical formula it says FeS2 x

Reply 102

Wanderingpro

you divide by 2 because the molar ratio was 1:2

Reply 103

Wanderingpro

Original post by louishill1

It's 290 but I wouldn't stress about it, I did the same, you'll probably get 3 marks for working.

I think it's 290 people got 188 because they saw the final bond energy as 51 but it was -51 which would make sense as 51 +51=102 and 290 -102= 188

Reply 104

jacqueslaflame

i thought it was okay but thinking back to it i feel like i made more mistakes than i realised

Reply 105

jack.thomas

The question about titanium chloride... it said why would you expect it NOT to be a liquid at room temperature
But on the previous line it said that titanium chloride WAS a liquid at room temperature
????

Reply 106

serenajerhamx

Original post by jack.thomas

Think you just slightly misread the question, it is a liquid at room temperature so the question was asking you why this was unusual (so why you’d expect it to not be a liquid at room temp).

Reply 107

Louis2002

I think it's because one is more dense than the other so the same ammount of moles occupies less space :smile:

- Whoever asked about this question cant remember xd

(edited 5 years ago)

Reply 108

Namakii

Original post by onoma

i thought it was okay but thinking back to it i feel like i made more mistakes than i realised

Yeah to be honest I'm starting to think the same.

Reply 109

Lemur14

Volunteer Section Leader

Hi there

I've moved your thread to the Chemistry forum where hopefully you'll get more answers :smile:

In future, it's best to select the subject from the list here and create a thread in there instead :yep:

If you want to see where threads belong, check out this thread :smile:

Reply 110

Cakecupcake

Original post by Louis2002

I think it's because one is more dense than the other so the same ammount of moles occupies less space :smile:

- Whoever asked about this question cant remember xd

1 mole of any gas occupies 24dm3 at room temp and pressure :frown:

Its cos the chlorine reacts with the carbon in the graphite at first then it only fully begins to be collected after the surface layer of graphite has reacted

Reply 111

jack.thomas

Original post by serenajerhamx

Think you just slightly misread the question, it is a liquid at room temperature so the question was asking you why this was unusual (so why you’d expect it to not be a liquid at room temp).

But it said that it is a liquid at room temperature, and i looks it up and it said that it is a liquid..

Reply 112

Hina Raja

Chemistry was easier than biology, Idk what the heck went wrong with biology!! The question on how to determine the concentration of the solution inside the egg was a joke.

Reply 113

Adam66

What was the answer for this do u know?

Reply 114

Adam66

For the bond energy question do any off you know the answer. I put 188 but i think I’m wrong

Reply 115

username3883194

Original post by Joe654

It was a genuine question? I got something along those lines aswell..

Fairs dude. Sorry if I sounded harsh.

I'm not sure, is my answer. Hopefully we'll get a couple marks.

Reply 116

Ivor Everson

Were you supposed to use the equation: volume of a gas = (mass of gas/ atomic mass) multiplied by 100?

Reply 117

Lawan2018

Original post by Blt2001

Hey, what did you guys get for the very last question about the mass of sodium hydroxide I think. I got 0.125g but everyone I asked said they got 0.126?