Edexcel Chemistry IGCSE 1C Unofficial Mark Scheme 19th May 2016
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Very easy 14%
Easy 28%
Okay 44%
Hard 11%
Very hard3%
Total votes: 408
PHYSICS MARK SCHEME HERE: http://www.thestudentroom.co.uk/showthread.php?t=4118187
Tell me the questions which I'm missing out - I'll add them in. Please try your best to remember the rough question number. Thanks for all the contributions, including the desperate Advait10.
1.a)
Condensation. (1)
1.b)
Energy: average ke of particles decreases.
Arrangement: the intermolecular spaces decrease (as some intermolecular
forces between particles start to form).
Movement: particles in liquids slide over each other. (3)
2.a)
Filtration. (1)
2.b)
Arrow drawn into solvent inside beaker.
Arrow drawn onto chromatography paper.
Arrow drawn onto the line on the chromatography paper. (3)
2.c)
There are for 4 dyes present in the substance as the original substance
dissolved into the solvent and 4 dyes were drawn up. (1)
3.a)
Hydrogen molecule bonding - two circles that cross over each other and at the
point of intersection there is a cross and a dot. The circles both have letters H
inside of them. (1)
3.b)
Element in the air - argon. (1)
3.c)
Compound present in unpolluted air - H2O (water) or CO2 (carbon dioxide). (1)
3.d)
Isotopes are atoms with specific number of neutrons independent to the number of protons that defines the element. (2)
3.e)
H1 - 1 proton, 0 neutrons, 1 electron.
H2 - 1 proton, 1 neutron, 1 electron.
H3 - 1 proton, 2 neutrons, 1 electron. (3)
3.f)
Atom with 3 protons - the diagram with 3 dots.
Atom in period 3 - the diagram with 15 dots (phosphorous).
Atom with 15 electrons - diagram with 15 dots (phosphorous).
Atom which is stable - diagram with 8 dots in outer shell (Neon).
3.g)
Compound formed between A and D - H2O (water). (1)
3.h)
A pair of electrons and nuclei of two atoms. (2)
4.a)
Simple filling in the temperatures - to 1 dp. (4)
4.b)
Max temperature produced by magnesium. (1)
4.c)
Ice used to cool down and condense the water vapour. (1)
4.d)
Products formed - magnesium chloride and hydrogen (gas). (2)
4.e) Magnesium can't be used in the reaction using air as it would oxidise to form magnesium oxide. (1)
4.f)
Increasing volume of acid to 50cm3 - not so great a rise in temperature as increase in volume of acid means that more energy is required for the same rise in temperature. (2)
4.g)
Draw arrow up onto the powder. (1)
5.a)
Copper pile turns black because the oxygen in the air reacts with it in a combustion reaction to form Copper oxide (black solid). (2)
5.b)
The gas is cooled down before it is measured so that its volume can be recorded at rtp (as the original volume had been measured in these conditions). Heated gases = expansion of volume. (1)
5.c)
Why didn't the small heap of copper turn black - because all of the oxygen in the air had been used up in the previous reaction hence no combustion reaction to oxidise copper. (1)
5.d)
Percentage of oxygen - 16.6 (recurring) or 16.7%. (2)
5.e)
Hydrogen has a low m + b pt. as it is a simple molecular compound hence has weak intermolecular forces which don't require a lot of energy to break. (2)
6.a)
In order of reactivity - Q, R, S, P. (4)
6.b)
Graph - draw straight lines of best fit, both lines must intersect. (4)
6.c)
Volume used - 12.5 cm3. (1)
6.d)
33 degrees celsius - I checked this with the best students in my year. (1)
7.a)
Test for presence of water - add to anhydrous copper (II) sulphate, turns white to blue.
OR add to anhydrous cobalt (II) chloride paper, turns blue to pink. (2)
7.b)
Test for purity - physical boiling point test - boils at 100 degrees celsius. (1)
9.a)
I2 + Cl2 = 2ICl. (1)
9.b)
Two features of equilibrium - rate of forward reaction = rate of reverse reaction and concentration of
products and reactants are equal. (2)
9.c)
The reverse reaction was endothermic because if the forward reaction is exothermic, increasing the temperature decreases the amount of product being formed hence equilibrium shifts to the left where ICl is formed which is brown. (2)
9.d)
Test for chloride ions - add nitric acid and silver nitrate, a white precipitate of silver chloride will form. (2)
10.a)
Enthalpy change. (1)
10.b)
19740 J - something around that. (2)
10.c)
Exothermic reaction - transfer of energy from system to surroundings. (1)
11.a)
Propane. (1)
11.b)
C4H10. (1)
11.c)
W, X, Y. (1)
11.d)
Empirical formula for Y - CH2. (1)
11.d)
A hydrocarbon with a double carbon = carbon covalent bond.
A hydrocarbon is a organic compound made of hydrogen and carbon only. (3)
11.e)
Displayed formula should have only 1 Br atom in it. (1)
11.f)
Condition required - UV light. (1)
12.a)
Carbon soot was formed in the incomplete combustion due to insufficient oxygen. (1)
12.b)
Reason why this affected result - fuel doesn't react fully with air due to insufficient oxygen in incomplete combustion hence not as much energy release. (1)
12.c)
Other loss of energy - heat energy lost to surroundings, hence not all transferred to water. (1)
13.a)
Reason for cotton wool - prevent acid from spitting out during reaction. (1)
13.b)
Why the mass on the scale reduced - because as the reaction progresses more product of CO2 is formed which is lost to the surroundings. (1)
14.a)Fill in the boxes for number of moles in the thermal decomposition. (4)
14.b)
Third equation is correct because 2 mole of the original substance forms 1 mole of the product and the table values were 0.08 moles and 0.04 moles. (2)
15.a)
Formula of titanium something must equal to that of the question. (2)
15.b)
Structure of titanium - giant metallic, layers of +ve ions surrounded by a sea of delocalised electrons. (2)
15.c)
Titanium is conductive as free delocalised electrons don't belong to specific ion hence can quickly transfer charge form -ve to +ve terminal in circuit. (1)
16.a)
Draw graph line - steeper and levels off first but at same level. (2)
16.c)
Increase in concentration = increase in particles per unit volume, hence increase in no. of collisions per unit time hence increase in no. of successful collisions per unit time, hence increase in rate of reaction. (3)
Tell me the questions which I'm missing out - I'll add them in. Please try your best to remember the rough question number. Thanks for all the contributions, including the desperate Advait10.
1.a)
Condensation. (1)
1.b)
Energy: average ke of particles decreases.
Arrangement: the intermolecular spaces decrease (as some intermolecular
forces between particles start to form).
Movement: particles in liquids slide over each other. (3)
2.a)
Filtration. (1)
2.b)
Arrow drawn into solvent inside beaker.
Arrow drawn onto chromatography paper.
Arrow drawn onto the line on the chromatography paper. (3)
2.c)
There are for 4 dyes present in the substance as the original substance
dissolved into the solvent and 4 dyes were drawn up. (1)
3.a)
Hydrogen molecule bonding - two circles that cross over each other and at the
point of intersection there is a cross and a dot. The circles both have letters H
inside of them. (1)
3.b)
Element in the air - argon. (1)
3.c)
Compound present in unpolluted air - H2O (water) or CO2 (carbon dioxide). (1)
3.d)
Isotopes are atoms with specific number of neutrons independent to the number of protons that defines the element. (2)
3.e)
H1 - 1 proton, 0 neutrons, 1 electron.
H2 - 1 proton, 1 neutron, 1 electron.
H3 - 1 proton, 2 neutrons, 1 electron. (3)
3.f)
Atom with 3 protons - the diagram with 3 dots.
Atom in period 3 - the diagram with 15 dots (phosphorous).
Atom with 15 electrons - diagram with 15 dots (phosphorous).
Atom which is stable - diagram with 8 dots in outer shell (Neon).
3.g)
Compound formed between A and D - H2O (water). (1)
3.h)
A pair of electrons and nuclei of two atoms. (2)
4.a)
Simple filling in the temperatures - to 1 dp. (4)
4.b)
Max temperature produced by magnesium. (1)
4.c)
Ice used to cool down and condense the water vapour. (1)
4.d)
Products formed - magnesium chloride and hydrogen (gas). (2)
4.e) Magnesium can't be used in the reaction using air as it would oxidise to form magnesium oxide. (1)
4.f)
Increasing volume of acid to 50cm3 - not so great a rise in temperature as increase in volume of acid means that more energy is required for the same rise in temperature. (2)
4.g)
Draw arrow up onto the powder. (1)
5.a)
Copper pile turns black because the oxygen in the air reacts with it in a combustion reaction to form Copper oxide (black solid). (2)
5.b)
The gas is cooled down before it is measured so that its volume can be recorded at rtp (as the original volume had been measured in these conditions). Heated gases = expansion of volume. (1)
5.c)
Why didn't the small heap of copper turn black - because all of the oxygen in the air had been used up in the previous reaction hence no combustion reaction to oxidise copper. (1)
5.d)
Percentage of oxygen - 16.6 (recurring) or 16.7%. (2)
5.e)
Hydrogen has a low m + b pt. as it is a simple molecular compound hence has weak intermolecular forces which don't require a lot of energy to break. (2)
6.a)
In order of reactivity - Q, R, S, P. (4)
6.b)
Graph - draw straight lines of best fit, both lines must intersect. (4)
6.c)
Volume used - 12.5 cm3. (1)
6.d)
33 degrees celsius - I checked this with the best students in my year. (1)
7.a)
Test for presence of water - add to anhydrous copper (II) sulphate, turns white to blue.
OR add to anhydrous cobalt (II) chloride paper, turns blue to pink. (2)
7.b)
Test for purity - physical boiling point test - boils at 100 degrees celsius. (1)
9.a)
I2 + Cl2 = 2ICl. (1)
9.b)
Two features of equilibrium - rate of forward reaction = rate of reverse reaction and concentration of
products and reactants are equal. (2)
9.c)
The reverse reaction was endothermic because if the forward reaction is exothermic, increasing the temperature decreases the amount of product being formed hence equilibrium shifts to the left where ICl is formed which is brown. (2)
9.d)
Test for chloride ions - add nitric acid and silver nitrate, a white precipitate of silver chloride will form. (2)
10.a)
Enthalpy change. (1)
10.b)
19740 J - something around that. (2)
10.c)
Exothermic reaction - transfer of energy from system to surroundings. (1)
11.a)
Propane. (1)
11.b)
C4H10. (1)
11.c)
W, X, Y. (1)
11.d)
Empirical formula for Y - CH2. (1)
11.d)
A hydrocarbon with a double carbon = carbon covalent bond.
A hydrocarbon is a organic compound made of hydrogen and carbon only. (3)
11.e)
Displayed formula should have only 1 Br atom in it. (1)
11.f)
Condition required - UV light. (1)
12.a)
Carbon soot was formed in the incomplete combustion due to insufficient oxygen. (1)
12.b)
Reason why this affected result - fuel doesn't react fully with air due to insufficient oxygen in incomplete combustion hence not as much energy release. (1)
12.c)
Other loss of energy - heat energy lost to surroundings, hence not all transferred to water. (1)
13.a)
Reason for cotton wool - prevent acid from spitting out during reaction. (1)
13.b)
Why the mass on the scale reduced - because as the reaction progresses more product of CO2 is formed which is lost to the surroundings. (1)
14.a)Fill in the boxes for number of moles in the thermal decomposition. (4)
14.b)
Third equation is correct because 2 mole of the original substance forms 1 mole of the product and the table values were 0.08 moles and 0.04 moles. (2)
15.a)
Formula of titanium something must equal to that of the question. (2)
15.b)
Structure of titanium - giant metallic, layers of +ve ions surrounded by a sea of delocalised electrons. (2)
15.c)
Titanium is conductive as free delocalised electrons don't belong to specific ion hence can quickly transfer charge form -ve to +ve terminal in circuit. (1)
16.a)
Draw graph line - steeper and levels off first but at same level. (2)
16.c)
Increase in concentration = increase in particles per unit volume, hence increase in no. of collisions per unit time hence increase in no. of successful collisions per unit time, hence increase in rate of reaction. (3)
(edited 7 years ago)
Scroll to see replies
Phew! Got almost all (possibly all, depends how generous the mark scheme is) of those.
Other potential questions later: hydrocarbons; solution X and Y; titanium chloride (I think?); CaCO3 chips at the end; rate those letters in terms of reactivity; reactivity with copper and magnesium...
Other potential questions later: hydrocarbons; solution X and Y; titanium chloride (I think?); CaCO3 chips at the end; rate those letters in terms of reactivity; reactivity with copper and magnesium...
Original post by metellaest
Phew! Got almost all (possibly all, depends how generous the mark scheme is) of those.
Other potential questions later: hydrocarbons; solution X and Y; titanium chloride (I think?); CaCO3 chips at the end; rate those letters in terms of reactivity; reactivity with copper and magnesium...
Other potential questions later: hydrocarbons; solution X and Y; titanium chloride (I think?); CaCO3 chips at the end; rate those letters in terms of reactivity; reactivity with copper and magnesium...
Do you know the question number?
product 1, product 2 question on magnesium and Hcl acid? question on concentration in acid affecting rate?
Original post by gabrieleluberti
product 1, product 2 question on magnesium and Hcl acid? question on concentration in acid affecting rate?
Magnesium Chloride and Hydrogen Gas
Acid increases rate, (so steeper curve at the beginning, levels off first but at the same height as first curve)
Original post by RivenLPL
Magnesium Chloride and Hydrogen Gas
Acid increases rate, (so steeper curve at the beginning, levels off first but at the same height as first curve)
Acid increases rate, (so steeper curve at the beginning, levels off first but at the same height as first curve)
Original post by gabrieleluberti
thats what i put thank you
What question no. was this?
Original post by conradliebers
What question no. was this?
i don't have such a great memory sorry ahahah
Original post by conradliebers
Tell me the questions which I'm missing out - I'll add them in.
1.a)
Condensation. (1)
1.b)
Energy: average ke of particles decreases.
Arrangement: the intermolecular spaces decrease (as some intermolecular
forces between particles start to form).
Movement: particles in liquids slide over each other. (3)
2.a)
Filtration. (1)
2.b)
Arrow drawn into solvent inside beaker.
Arrow drawn onto chromatography paper.
Arrow drawn onto the line on the chromatography paper. (3)
2.c)
There are for 4 dyes present in the substance as the original substance
dissolved into the solvent and 4 dyes were drawn up. (1)
3.a)
Hydrogen molecule bonding - two circles that cross over each other and at the
point of intersection there is a cross and a dot. The circles both have letters H
inside of them. (1)
3.b)
Element in the air - argon. (1)
3.c)
Compound present in unpolluted air - H2O (water) or CO2 (carbon dioxide). (1)
3.d)
Isotopes are atoms with specific number of neutrons independent to the number of protons that defines the element. (2)
3.e)
H1 - 1 proton, 0 neutrons, 1 electron.
H2 - 1 proton, 1 neutron, 1 electron.
H3 - 1 proton, 2 neutrons, 1 electron. (3)
3.f)
Atom with 3 protons - the diagram with 3 dots.
Atom in period 3 - the diagram with 15 dots (phosphorous)
Atom with 15 electrons - diagram with 15 dots (phosphorous)
4.a)
Copper pile turns black because the oxygen in the air reacts with it in a combustion reaction to form Copper oxide (black solid). (2)
4.b)
The gas is cooled down before it is measured so that its volume can be recorded at rtp (as the original volume had been measured in these conditions). Heated gases = expansion of volume. (1)
4.c)
Why didn't the small heap of copper turn black - because all of the oxygen in the air had been used up in the previous reaction hence no combustion reaction to oxidise copper. (1)
4.d)
Percentage of oxygen - 16.6 (recurring) or 16.7%. (2)
5.a)
In order of reactivity - Q, R, S, P. (4)
11.a)
Propane. (1)
11.b)
C4H10. (1)
11.c)
W, X, Y. (1)
11.d)
A hydrocarbon with a double carbon = carbon covalent bond.
A hydrocarbon is a organic compound made of hydrogen and carbon only. (3)
11.d)
Displayed formula should have only 1 Br atom in it. (1)
1.a)
Condensation. (1)
1.b)
Energy: average ke of particles decreases.
Arrangement: the intermolecular spaces decrease (as some intermolecular
forces between particles start to form).
Movement: particles in liquids slide over each other. (3)
2.a)
Filtration. (1)
2.b)
Arrow drawn into solvent inside beaker.
Arrow drawn onto chromatography paper.
Arrow drawn onto the line on the chromatography paper. (3)
2.c)
There are for 4 dyes present in the substance as the original substance
dissolved into the solvent and 4 dyes were drawn up. (1)
3.a)
Hydrogen molecule bonding - two circles that cross over each other and at the
point of intersection there is a cross and a dot. The circles both have letters H
inside of them. (1)
3.b)
Element in the air - argon. (1)
3.c)
Compound present in unpolluted air - H2O (water) or CO2 (carbon dioxide). (1)
3.d)
Isotopes are atoms with specific number of neutrons independent to the number of protons that defines the element. (2)
3.e)
H1 - 1 proton, 0 neutrons, 1 electron.
H2 - 1 proton, 1 neutron, 1 electron.
H3 - 1 proton, 2 neutrons, 1 electron. (3)
3.f)
Atom with 3 protons - the diagram with 3 dots.
Atom in period 3 - the diagram with 15 dots (phosphorous)
Atom with 15 electrons - diagram with 15 dots (phosphorous)
4.a)
Copper pile turns black because the oxygen in the air reacts with it in a combustion reaction to form Copper oxide (black solid). (2)
4.b)
The gas is cooled down before it is measured so that its volume can be recorded at rtp (as the original volume had been measured in these conditions). Heated gases = expansion of volume. (1)
4.c)
Why didn't the small heap of copper turn black - because all of the oxygen in the air had been used up in the previous reaction hence no combustion reaction to oxidise copper. (1)
4.d)
Percentage of oxygen - 16.6 (recurring) or 16.7%. (2)
5.a)
In order of reactivity - Q, R, S, P. (4)
11.a)
Propane. (1)
11.b)
C4H10. (1)
11.c)
W, X, Y. (1)
11.d)
A hydrocarbon with a double carbon = carbon covalent bond.
A hydrocarbon is a organic compound made of hydrogen and carbon only. (3)
11.d)
Displayed formula should have only 1 Br atom in it. (1)
missing out condition for substitution reaction to occur and empirical formula of Y? i think
Original post by alic12345
missing out condition for substitution reaction to occur and empirical formula of Y? i think
Thanks!
Original post by conradliebers
Thanks!
Hold on I put substitution as an answer... Is that right?
Last year it was about 135-7 for this + the triple paper? That's about 75%. I expect it will be quite similar?
Posted from TSR Mobile
Posted from TSR Mobile
Original post by Emilyros
Why ice was used?
Describing a covalent bond?
The maximum temperature produced?
Why experiment 1 was faster than experiment 2?
Thanks for doing this btw - really helpful
Anyone got any ideas about the grade boundaries?
Describing a covalent bond?
The maximum temperature produced?
Why experiment 1 was faster than experiment 2?
Thanks for doing this btw - really helpful
Anyone got any ideas about the grade boundaries?
I really want to add them in but do you know roughly which question they came in?
I think this exam was a lot easier than previous ones - especially people in my school - so I think they could be raised, but an A* will be around 75-80 %.
Original post by architecture901
Hold on I put substitution as an answer... Is that right?
The condition required was UV light.
Missing out calcium carbonate equations decomposing to calcium oxide, then making calcium chloride and one other. (3)
Missing out test for chloride ions (nitric acid and silver nitrate- White precipitate).
Missing out calorimetery experiment.
Missing out how adding double the volume of acid makes temperature decrease as acid is already in excess.
Don't know the question numbers, sorry...
Missing out test for chloride ions (nitric acid and silver nitrate- White precipitate).
Missing out calorimetery experiment.
Missing out how adding double the volume of acid makes temperature decrease as acid is already in excess.
Don't know the question numbers, sorry...
It depends on the difficulty of paper 2. If paper 2 is of a similar difficulty I would imagine the grade boundary to between 137-140 (out of 180)?
I think the calcium carbonate one was:
Calcium oxide
Calcium chloride
Calcium hydrogen carbonate (a question later in the paper basically gave this answer away)
I think the calcium carbonate one was:
Calcium oxide
Calcium chloride
Calcium hydrogen carbonate (a question later in the paper basically gave this answer away)
Original post by MattB_
It depends on the difficulty of paper 2. If paper 2 is of a similar difficulty I would imagine the grade boundary to between 137-140 (out of 180)?
I agree but I think they'll make paper 2 harder considering this one wasn't.
Original post by conradliebers
I agree but I think they'll make paper 2 harder considering this one wasn't.
Unfortunately that will probably be the case
Quick Reply
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