2016 IGCSE Chemistry Paper 2 Unofficial Mark Scheme 2016

When crystals form at the bottom of a glass rod it is at the point of crystallisation. When you put the glass rod in.

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Reply 22

http://www.avogadro.co.uk/chemeqm/acidbase/titration/phcurves.htm

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Original post by Nurne

wow i think i put rred :frown:

Reply 23

Helper OF ALL

nope u see the edexcel igcse june 2014 1C paper.. question 15.. the same question is there... they accept red also.. huh!!!!!!

Reply 24

Guys i used 3 volumes for the average, who else did that?

Reply 25

Helper OF ALL

i remember a couple of answers apart from given above.. i ll share them later

Reply 26

MgCl has high melting point
It is a giant ionic structure
So it has a lot of strong ionic bonds caused by electrostatic attraction between oppositely charged ions
So it requires a high energy to break these bonds
Meaning that a high temperature (high thermal energy) is needed to break these bonds and cause the compound to melt.

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(edited 7 years ago)

Reply 27

Original post by Abodee1

Guys i used 3 volumes for the average, who else did that?

yea, had to double check because i was expecting 2!

Reply 28

meme259

Original post by Abodee1

Guys i used 3 volumes for the average, who else did that?

Yep same

Reply 29

3 volumes for average answer is 22.53

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Reply 30

Original post by rcmack

yea, had to double check because i was expecting 2!

it was 22.5333333
which can be rounded to 22.53 i believe?

Reply 31

Original post by Nurne

3 volumes for average answer is 22.53

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was that part of the Magnesium chloride one?

Reply 32

Lelanor

Original post by Abodee1

Red is totally wrong,It is orange.Red is for acid.

Original post by Nurne

Orange at neutralisation not red. Red is acid.

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Original post by aaljhfgahsj

Do you think they'll accept orange in place of red, the question wasn't that clear

Just read these (after posting the post I just posted), I didn't realise there was a colour for neutral (it would be nice if the CGP revision guides could mention it :angry:

???) but hopefully my answer will be accepted like the summer 2014 1c paper.

Reply 33

robot no.01

For the organic product I just added H to every bond as H can only make one bond there was no room for OH so I assumed another non-organic product would be made as it only asked for the organic product

Reply 34

Nothing incorrect so far, seems like a full mark? wow never thought thats possible.

Reply 35

Fe3+ Orange/Brown precipitate
Fe2+ Dark green precipitate

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Reply 36

Original post by Lelanor

Just read these (after posting the post I just posted), I didn't realise there was a colour for neutral (it would be nice if the CGP revision guides could mention it :angry:

???) but hopefully my answer will be accepted like the summer 2014 1c paper.

i would literally be dead if it werent for tthe CGP books

Reply 37

Original post by rcmack

was that part of the Magnesium chloride one?

Part of the KOH titration one it was the last part.

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Reply 38

C8H18 +8 1/2O2 -> 8CO + 9H20

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(edited 7 years ago)

Reply 39