2016 IGCSE Chemistry Paper 2 Unofficial Mark Scheme 2016

A* = 47-48/60 in paper 2, and overall about 78-80 percent probably for an A*

they might be a lot higher this year, because both the papers were fairly easy

Wait were there 3 questions on the last page? I dont remember them asking for the moles. I only remember them asking for mass and volume??

Don't worry, there was only two questions on the last page where moles played a vital part in each one.

Ok phew i got them both right but freaked out when i thought i had missed a q ahaha

Is the markscheme complete or are some qs missing?

they might be a lot higher this year, because both the papers were fairly easy

theres a few questions missing, but i think most of the main ones have been covered

Edexcel iGCSE Chemistry Paper 2C 15 June, sorry should have specified in the question...
Please send the answers and the question numbers you remember
Please also point out any mistakes or mistakes in question numbers

1a) Glass rod / stirrer and Bunsen Burner
1b) Liquids that dissolve is solvent
1c) Colourless liquid is solution
1d) Solid insoluble impurities removed in stage 2 (filtration), salt crystals removed in stage 3 (crystallisation)
1d) Crystallisation point is when crystals begin to form
1e) Water evaporates from the heat

2a) Water levels rose as oxygen in air reduced as it reacted with iron to produce hydrated iron oxide, stopped as all oxygen had been used up
2b) Cant remember what it asked but it was:
iron? + sulphuric acid? -> iron sulphate + hydrogen
2c) 2HNO3 + CuO -> Cu(NO3)2 + H2O
2d) Warmed acid as it increased rate of reaction
2e) In excess when solid starts to form at the bottom (stops dissolving)

3a) Metal oxide is alkaline (e.g. sodium hydroxide) and non metal oxides are acidic (e.g. sulphur dioxide)
3b) Dot cross diagram of MgCl with each with a full outer shell, and chloride ions with one donated electron, charges where Mg2+ and Cl- x2
3c) Ionic bonding is transfer of electrons, producing a positive and negative ion(s), with electro-static forces of attraction between oppositely charged ions
3d) Why ionic is strong: strong electro-static forces between oppositely charged ions which need a lot of energy to break

4a) Titration
4b) Pipette to add 25cm3
4c) Methyl orange is yellow before, orange OR red when neutral
4d) Fe2+ gives green precipitate, Fe3+ gives brown(/orange) precipitate
4e) Burrette readings, can't remember exact values but values had to be given to 2 decimal places
4f) 22.60, 22.45, 22.55 for the concordant results in boxes 2, 3, 4 with an average of 22.533....., 22.53 to have 2dp, like the given results


5a) Isomer has the same chemical formula but different structural formula
5b) Isomer of with 4 carbons and 8 hydrogens with a double bond
5c) Test with bromine water, which goes colourless in the one with a double bond (but-1-ene i think?) and stays orange in the other one
5d) CH3-CH2-CH2-OH
5e) Cant remember the monomer but ( )n with the double bond broken and carbon bonds outside brackets

6a) Refinery gas has lowest boiling point, bitumen was most viscous
6b) Long chain hydrocarbon -> C10H20 and x number of ethene
6c) Cracking is important as shorter chain hydrocarbons are in higher demand, as they are used for cars (i.e. gasolene etc..)
6d) Long Hydrocarbon + Oxygen --> Carbon, Carbon Monoxide, Carbon Dioxide and Water
i think it is C8H18 + 6O2 > 6C + CO2 + CO + 9H2O, variants without Carbon may be accepted

7a) 2.75g
7b) Using 0.0625 moles from A, 1500 cm3 of Carbon Dioxide

cant remember question number but:

3:1 ratio electrons:Al so 20/3 moles of Al
mass= moles x mr so 6.666 x 27 = 180g






Hope this mark scheme helped!!! Good luck in Triple Physics and the rest of your exams!

would 138 be a reasonably comfortable A

Posted from TSR Mobile

Edexcel iGCSE Chemistry Paper 2C 15 June, sorry should have specified in the question...
Please send the answers and the question numbers you remember
Please also point out any mistakes or mistakes in question numbers

1a) Glass rod / stirrer and Bunsen Burner
1b) Liquids that dissolve is solvent
1c) Colourless liquid is solution
1d) Solid insoluble impurities removed in stage 2 (filtration), salt crystals removed in stage 3 (crystallisation)
1d) Crystallisation point is when crystals begin to form
1e) Water evaporates from the heat

2a) Water levels rose as oxygen in air reduced as it reacted with iron to produce hydrated iron oxide, stopped as all oxygen had been used up
2b) Cant remember what it asked but it was:
iron? + sulphuric acid? -> iron sulphate + hydrogen
2c) 2HNO3 + CuO -> Cu(NO3)2 + H2O
2d) Warmed acid as it increased rate of reaction
2e) In excess when solid starts to form at the bottom (stops dissolving)

3a) Metal oxide is alkaline (e.g. sodium hydroxide) and non metal oxides are acidic (e.g. sulphur dioxide)
3b) Dot cross diagram of MgCl with each with a full outer shell, and chloride ions with one donated electron, charges where Mg2+ and Cl- x2
3c) Ionic bonding is transfer of electrons, producing a positive and negative ion(s), with electro-static forces of attraction between oppositely charged ions
3d) Why ionic is strong: strong electro-static forces between oppositely charged ions which need a lot of energy to break

4a) Titration
4b) Pipette to add 25cm3
4c) Methyl orange is yellow before, orange OR red when neutral
4d) Fe2+ gives green precipitate, Fe3+ gives brown(/orange) precipitate
4e) Burrette readings, can't remember exact values but values had to be given to 2 decimal places
4f) 22.60, 22.45, 22.55 for the concordant results in boxes 2, 3, 4 with an average of 22.533....., 22.53 to have 2dp, like the given results


5a) Isomer has the same chemical formula but different structural formula
5b) Isomer of with 4 carbons and 8 hydrogens with a double bond
5c) Test with bromine water, which goes colourless in the one with a double bond (but-1-ene i think?) and stays orange in the other one
5d) CH3-CH2-CH2-OH
5e) Cant remember the monomer but ( )n with the double bond broken and carbon bonds outside brackets

6a) Refinery gas has lowest boiling point, bitumen was most viscous
6b) Long chain hydrocarbon -> C10H20 and x number of ethene
6c) Cracking is important as shorter chain hydrocarbons are in higher demand, as they are used for cars (i.e. gasolene etc..)
6d) Long Hydrocarbon + Oxygen --> Carbon, Carbon Monoxide, Carbon Dioxide and Water
i think it is C8H18 + 6O2 > 6C + CO2 + CO + 9H2O, variants without Carbon may be accepted

7a) 2.75g
7b) Using 0.0625 moles from A, 1500 cm3 of Carbon Dioxide

cant remember question number but:

3:1 ratio electrons:Al so 20/3 moles of Al
mass= moles x mr so 6.666 x 27 = 180g
Hope this mark scheme helped!!! Good luck in Triple Physics and the rest of your exams!

Should be an a *

for 3a, did you have to say magnesium oxide or could you just put magnesium? i can't remember the question but wasn't it would of these will form a alkali