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OFFICIAL: GCSE AQA Chemistry - C1- Higher- 19th May 2016 - AM

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Ishan_2000

What were the two marks to the reactivity question?

"Suggest why....referring to reactivity series...some metal carbonates decompose more easily than others..." (I think that was the question)

Reply 201

username1888141

Original post by mayjunemayhem

Ah well. It's done now let's just hope the grade boundaries aren't sky high. It will probably be similar to last years

Posted from TSR Mobile

last year it was 50 was A* so I think it will be sky high.

Reply 202

Evadriscoll1

Yeah i put that too but i think it is supposed to be 4Fe instead of 2Fe2. Maybe they will allow that, if not we will definately get atleast one mark for Fe

Reply 203

Obnox

Original post by mayjunemayhem

Ah well. It's done now let's just hope the grade boundaries aren't sky high. It will probably be similar to last years

Posted from TSR Mobile

Do you know last years grade boundaries?

Reply 204

thecomputernerd

Original post by Obnox

You should get 2 marks for that, i put the it is more flexible, durable and harder than aluminium.

sweet, thanks :smile:

Reply 205

Obnox

Original post by Ishan_2000

What were the two marks to the reactivity question?

"Suggest why....referring to reactivity series...some metal carbonates decompose more easily than others..." (I think that was the question)

I said that the metals below carbon in the reactivity series were more reactive?? That was one of the hard questions...

Reply 206

redsoules

Original post by Ishan_2000

What were the two marks to the reactivity question?

"Suggest why....referring to reactivity series...some metal carbonates decompose more easily than others..." (I think that was the question)

These were regarding potassium (something). K is above carbon and therefore does not react at all. More heat was needed for a reaction. cant remember my last point.

Reply 207

ty19999

I wrote by increasing the temperature of the water u could put less water ?
Can someone please answer ?

Reply 208

Obnox

Original post by ty19999

I wrote by increasing the temperature of the water u could put less water ?
Can someone please answer ?

I dont thinks thats right :frown:

Reply 209

redsoules

Original post by ty19999

I wrote by increasing the temperature of the water u could put less water ?
Can someone please answer ?

I wrote increasing the surface area of the flame to distribute an even amount of heat to the beaker.

Again, surprised if I get 1 mark for that. Pissed off.

Reply 210

Cheesemasters

what was that question when using ethene to make ethanol?

I put fractional distillation and said crude oil of ethene is pumped in vaoprises and condenses at the boiling point of ethanol.

Also for the one about sugar,
Was that to do with fementation? Because thats all i put xD

and the the one which said give a advantage of using crude oil or something like that

Reply 211

Ishan_2000

Original post by redsoules

These were regarding potassium (something). K is above carbon and therefore does not react at all. More heat was needed for a reaction. cant remember my last point.

But, magnesium is above Carbon, and did react! Yes, that was the question prior to the reactivity question, about potassium carbonate not reacting, and not enough heat/energy.

Reply 212

Obnox

Original post by Cheesemasters

Using ethene to make ethanol i talked about the direct hydration of ethene?

Reply 213

Ishan_2000

Original post by Obnox

I said that the metals below carbon in the reactivity series were more reactive?? That was one of the hard questions...

Copper is below Carbon, so is less reactive than all the other ones. So, can't be that. I wasn't sure either.

Reply 214

Ads.m

Original post by Obnox

Using ethene to make ethanol i talked about the direct hydration of ethene?

Hydration of ethene with steam, in the presence of a catalyst.

Reply 215

redsoules

Original post by Obnox

Using ethene to make ethanol i talked about the direct hydration of ethene?

Water boils at a higher temp than Ethanol.
Ethanol evaporates and condenses in the condensor column.
After condensing the drop/drippings/droplets fall into a separate beaker to form pure ethanol.

(this is a shorter and concise answer than I wrote)

EDIT: Fractional distillation will most likely get you no marks. This is not the same process as normal distillation.

Reply 216

Ads.m

Is there a full unofficial mark scheme like there was for biology? If not does anybody know enough to make one?

Reply 217

Adzkii786

I put "the higher position of an element in the reactivity series, the faster it will react" will i get 1 mark
also i put the potassium didnt go cloudy "temperature wasnt high engough so the potassium didnt decompose to form co2 and thus the limewater didnt go cloudy" (atleast 2 out of 3 marks?