Edexcel IGCSE Chemistry 18th May/June 2017 Thread

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For the iron mixing in the water... I just said that water was needed for the reaction to take place. I couldn't think of anything more technical to say about it. And it was only a 1 mark question. Would that be enough to get the mark?

I said that iron only reacts with oxygen and water so oxygen is needed. You'll probably get the mark

Reply 141

Darwinion

What did people put for the purposes of the reactions in the in the iron ore/blast furnace question?

For the production of CO2 I said that the reaction was strongly exothermic and raised the temperature of the process.

And for the production of CO I said that this was the main reducing agent used in the process (though not the only one).

Reply 142

2959674

Original post by BerylTheBird

I put that the higher temperature would provide a higher kinetic energy hence, each particle will have more chance of having enough activation energy for the reaction to start. Not 100% sure tho

I put the same thing. It's most probably correct.

Reply 143

Tatsien

Original post by Darwinion

My answer was that Iron needs a solvent to dissolve, and water was used as a solvent.

Reply 144

2959674

For the test for chloride ions, i said add hydrochloric acid instead of nitric acid. Will I lose a mark?

(Edited text in bold)

(edited 6 years ago)

Reply 145

username3196004

we have a very complete mark scheme
https://www.thestudentroom.co.uk/showthread.php?t=4721406
but some things may be wrong :frown:

(edited 6 years ago)

Reply 146

Tatsien

Original post by Jimmyfox

Would I lose a mark for the Moles question if I put 7.15?

Most probably. I don't think Moles can be anything else than an integer or integer and 1/2, for example 4.4

Reply 147

fernsehturm

Original post by Jimmyfox

Do you think if I put 7.15 I would lose a mark?

Someone asked my Chemistry teacher afterwards and he said you would lose a mark for that; apparently you do have to round it to the nearest whole number though. I imagine you'll still get the three method marks though so it doesn't really matter!

Reply 148

Tatsien

Original post by Jimmyfox

Would I lose a mark for the Moles question if I put 7.15?

Most probably. I don't think Moles can be anything else than an integer or integer and 1/2, for example 4.5

Reply 149

ITSJDOG

Does anyone have any ideas about what topics the second paper would have?

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Reply 150

xsyxhxmxs

Original post by Darwinion

I struggled with 3 bits. What did people put for the very last question as to the 2nd reason for increase in rate of reaction as temperature increased?

I started to write that the teacher must have broken up the solid in smaller chunks, but then crossed it out as I figured that would increase the rate regardless of temp.rise. Plus the fact that it had already been touched upon with the iron filings in another question, so thought they wouldn't ask the same thing twice :tongue:

So I ended up putting that the water particles receive more kinetic energy as the temp.increased so they breach the activation energy required more easily.

Also I'm not confident about m,y answer to the ionic equation they asked us to write. I ended up putting: 2Na+ + At2- plus Cl2 gives 2(Na+ Cl-) plus At2. Something like that anyway.
Dunno if I'd be penalised for putting in the sodium spectator ions.

And the magnesium sulfate crystals question... what did peeps put for the formulae of the 2 substances in the filtrate?
I put water (H20) that wasn't crystallised and also MgS04. I nearly put sulfuric acid in case it was in excess but the question didn't state that.

for the 2nd reason to why temperature speed up the rate of reaction, I put the temperature also causes gases to expand, getting larger in size. thus more frequent collisions and a faster reaction.

for the magnesium sulfate question I had no idea what would be filtered so I put sulfuric acid and magnesium oxide

Reply 151

Lechatn0ir

Original post by ITSJDOG

Does anyone have any ideas about what topics the second paper would have?

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I'm thinking Electrolysis (aluminium extraction wasn't mentioned), more stuff about the industry like the Haber and Contact press. They always have ethanol production questions and a bunch of calculations.

Reply 152

Bodysnatcher Ed

Original post by Greenapplepear

Hi guys,
this is a thread for people who are doing the Edexcel IGCSE Chemistry exam in May/June 2017.

Here's the Specification:
http://qualifications.pearson.com/content/dam/pdf/International%20GCSE/Chemistry/2011/Specification%20and%20sample%20assessments/9780997864786_INT_GCSE_CHEM_SPECSAMS_ISS5_comb.PDF

Past Papers and Mark Schemes:
http://qualifications.pearson.com/en/qualifications/edexcel-international-gcses-and-edexcel-certificates/international-gcse-chemistry-2011.coursematerials.html#filterQuery=Pearson-UK:Category%2FExam-materials

Revision Guide:
https://nzkhanew.wikispaces.com/file/view/Edexcel%2Bigcse%2Bchemistry%2BRevision%2Bguide.pdf

https://www.thestudentroom.co.uk/g/resources/igcse_edexcel_chemistry_revision

Also, post your answers to the following questions:
1.Favourite Topic
2.Least Favourite Topic
3.Most Confident Topic
4.Least Confident Topic
5.Have You Started Revising Yet?

Good Luck everyone, anymore resources would also be useful!!! :smile:

Hi Guys I don't feel I done well on paper 1 at all so I need to do well in paper 2 to boost my grade any ideas on the difference and topics that come up on paper two?

Reply 153

talos99

What do you guys think the grade boundaries will be like this year? I really want to get a B but after this paper I'm not so confident. I think I left out about 25 marks worth of questions. If this years boundaries are anything like last years, a 55% gets you a B, so I gonyl had to get 66 marks on this paper. I'm seriously afraid. I really don't want to resit..

Reply 154

Jimmyfox1

Original post by Tatsien

Most probably. I don't think Moles can be anything else than an integer or integer and 1/2, for example 4.5

But would I lose more than one mark? I don't think I used the conventional calculation, as people were getting whole numbers for their answer

Reply 155

k.ee.n.a

Original post by ITSJDOG

Does anyone have any ideas about what topics the second paper would have?

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I think electrolysis will come up, lots of mathsy qs, more organic and industrial chemistry...and maybe dot and cross diagrams. That's my guess.

Reply 156

Tatsien

Original post by Jimmyfox1

But would I lose more than one mark? I don't think I used the conventional calculation, as people were getting whole numbers for their answer

No-one got a whole answer. They all got 7.149 correct to 4 s.f.

Reply 157

MD5745

I knew all about Galvanising and Zinc being more reactive than iron but the symbols we had to include really threw me off.

Reply 158

MD5745

Original post by Jimmyfox

Would I lose a mark for the Moles question if I put 7.15?

I think you're always supposed to round it - but if you managed to get to that point you'll probably get the marks for working. I found the Oxygen one hard; I got 28% alongside many others and we all noticed it was a bit off, tricky question.

Reply 159

ITSJDOG

I think I've done super bad in chemistry this year. 😒 Does anyone know when the resit would be? I'm definitely not gonna get the grade I want

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