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® IGCSE is a registered trademark.
This syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/11 Paper 1 Multiple Choice (Core) May/June 2017
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/12 Paper 1 Multiple Choice (Core) May/June 2017
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/13 Paper 1 Multiple Choice (Core) May/June 2017
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/21 Paper 2 Multiple Choice (Extended) May/June 2017
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/22 Paper 2 Multiple Choice (Extended) May/June 2017
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/23 Paper 2 Multiple Choice (Extended) May/June 2017
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/31 Paper 3 Theory (Core) May/June 2017
MARK SCHEME
Maximum Mark: 80
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
3(a) any 5 of: X has covalent bonding X particles are randomly arranged / irregularly arranged X particles are moving rapidly / freely / randomly / irregularly Y has ionic bonding / ionic Y particles are regularly arranged / lattice / in rows / uniformly arranged Y particles (only) vibrate / do not move from place to place Z has covalent bonding Z particles are regularly arranged / lattice / in a tetrahedral shape Z particles (only) vibrate / do not move from place to place
5
3(b) volume gets smaller 1
particles get closer together 1
3(c) drill tips / drills / cutting (tools) 1
3(d) A / substance Y dissolves easily in water 1
C / substance Y melts (at 8015 °C) 1
the change can be reversed by altering the conditions 1
4(a) has two atoms in a molecule / two atoms combined 1
4(b)(i) the chlorine has displaced / replaced the bromine (in KBr) 1
4(b)(ii) (from green / colourless) to orange 1
4(b)(iii) I2 1
KBr 1
4(c) add (nitric acid then aqueous) silver nitrate 1
yellow precipitate 1
4(d)(i) water purification / water treatment / killing bacteria / in (swimming) pools / disinfectant 1
4(d)(ii) breaking down of a compound / breaking down of a substance 1
(using) heat 1
4(d)(iii) any 2 distinct pollution problems: • litter OR eyesore • sticks in gullets OR throats of birds / animals • blocking of drains OR watercourses • animals gets trapped OR tangled (in plastic) • poisonous vapours when burned • fills landfill sites
6(a)(ii) iron is cheap(er) / tungsten is (too) expensive OR iron is strong(er) / tungsten is weaker
1
6(a)(iii) tungsten because it has a (very) high melting point 1
6(b) any 2 properties: • high melting point / high boiling point • high density • hard / strong • sonorous / rings (when hit) • ions are coloured / compounds are coloured
2
6(c) 2 (W) 1
3 (O2) 1
6(d) tungsten < cobalt < iron < magnesium IF full credit is not awarded, allow 1 mark for either a correct sequence apart from a consecutive pair reversed OR for the whole sequence reversed
2
6(e)(i) the more concentrated the acid, the greater the rate ORA 1
6(e)(ii) nitric (acid) 1
6(e)(iii) any value between 19 and 39 hours (exclusive of these values) 1
7(a) the energy of the reactants is greater than the energy of the products / the product has less energy than the reactants / the arrow is going down (from reactants to product)
1
7(b) any 2 sources: • carbon monoxide from incomplete combustion of fossil fuels / named fossil fuel / named carbon-containing fuel • carbon dioxide from combustion of fossil fuels / respiration • methane from animal flatulence / rice paddy fields / bacteria / decomposition of vegetation / decomposition of
animals any 3 effects:
• carbon dioxide: global warming / greenhouse effect / acidification of oceans • methane: global warming / greenhouse effect • carbon monoxide: poisonous / toxic
5
7(c)(i) making mortar / whitewash / neutralising (acidic) soils / neutralising acidic lakes / flue gas desulfurisation / steelmaking / glassmaking / making plaster
1
7(c)(ii) 100 IF full credit is not awarded, allow 1 mark for (Ca =) 40, (C =) 12 and (O =) 16
2
7(d) add hydrochloric acid to the mixture 1
filter off the carbon 1
wash carbon (with water or other solvent) AND dry in an oven / air dry / leave in air / leave to dry 1
® IGCSE is a registered trademark.
This syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/32 Paper Theory (Core) May/June 2017
MARK SCHEME
Maximum Mark: 80
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
3(a) any 5 of: X has ionic bonding / ionic X particles are regularly arranged / lattice / in rows / uniformly arranged X particles (only) vibrate / do not move from place to place Y has covalent bonding Y has irregular arrangement of particles / random arrangement Y particles are sliding over each other / moving slowly Z has covalent bonding Z particles are randomly arranged / irregularly arranged Z particles moving randomly / moving rapidly / moving freely / moving quickly / moving fast
5
3(b) volume increases / volume gets larger 1
particles get further apart 1
3(c) white 1
to blue 1
3(d) it has (two different types of) atoms bonded / joined 1
4(a)(ii) it is (very) reactive / too reactive / above carbon in the reactivity series / more reactive than carbon 1
4(b)(i) hydrogen/ H2 1
4(b)(ii) gas syringe connected to a flask OR this described in words 1
closed apparatus / workable apparatus OR this described in words 1
timer or stopwatch OR this described in words 1
4(c) for aircraft / car bodies 1
low density 1
4(d) any 2 advantages: • saves energy • saves mining of ore • saves other finite resources • saves transport costs of bringing ore to factory • reduces pollution(due to dust or exhaust fumes etc.)
2
4(e)(i) (zinc oxide) loses oxygen 1
4(e)(ii) reactant level below product level / reactants have less energy than products / products have more energy than reactants 1
6(c) any 3 from: • high melting point / high boiling point • high density • forms coloured compounds / compounds are coloured / ions are coloured • has more than one oxidation state / forms ions with different charges • forms complex ions • catalyst • hard / strong • sonorous / rings (when hit)
3
6(d) 2 (HCl ) 1
H2 1
6(e) gold < copper < iron < potassium IF full credit is not awarded, allow 1 mark for either a correct sequence apart from a consecutive pair reversed OR for the whole sequence reversed
2
6(f)(i) the higher the concentration the faster the rate / the lower the concentration the slower the rate / as the concentration increases the rate of reaction increases
1
6(f)(ii) phosphoric 1
6(f)(iii) any value between 45 and 102 hours (exclusive of these values) 1
suitable use, e.g. (making) sulfuric acid / making SO2 / dusting plants / vulcanising rubber 1
7(c) sublimation / subliming / sublime 1
7(d) any 2 sources: • sulfur dioxide: from volcanoes / burning fossil fuels • oxides of nitrogen: from car exhausts / high temperature furnaces / lightning
any 3 effects:
• sulfur dioxide: acid rain / named effects of acid rain • sulfur dioxide: irritates eyes or skin • oxides of nitrogen: acid rain / named effect of acid rain • oxides of nitrogen: breathing difficulties / breathing problems / irritates eyes / skin / photochemical smog
5
7(e) add hydrochloric acid to the mixture 1
filter off the sulfur / sulfur on filter paper 1
wash sulfur (with water or other solvent) AND dry in an oven / air dry / leave to dry (in air) 1
® IGCSE is a registered trademark.
This syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/33 Paper 3 Theory (Core) May/June 2017
MARK SCHEME
Maximum Mark: 80
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
3(a) any 5 of: P has ionic bonding / ionic P particles are regularly arranged / lattice / in rows / uniformly arranged P particles (only) vibrating / not moving from place to place Q has covalent bonding Q has irregular arrangement of particles / random arrangement Q particles moving slowly / moving randomly / sliding over each other R no bonding (between atoms) / weak bonding between atoms / weak attractive forces between atoms R has irregular arrangement of particles / random arrangement R particles moving randomly / moving rapidly / freely moving / randomly (moving) / irregular (movement)
5
3(b) volume increases 1
particles get further apart 1
3(c) C / boils (at 1330 °C) 1
D / dissolves (readily in water) 1
the change can be reversed by altering the conditions 1
4(d) any 2 advantages from: saves energy / saves mining of ore / saves other finite resources / saves transport costs of bringing ore to factory / reduces dust pollution / exhaust gas pollution
7(a) pair of electrons in overlap area between O atom and both H atoms 1
7(b) electrical conductivity 1
melting point / boiling point 1
7(c) iron < magnesium < cerium < lithium IF full credit is not awarded, allow 1 mark for either a correct sequence apart from a consecutive pair reversed OR for the whole sequence reversed
2
7(d)(i) water 1
air / oxygen 1
7(d)(ii) any 2 methods from: greasing / covering with plastic / galvanising / painting / (electro)plating
2
7(e) evaporate to crystallisation point / leave in a warm place until crystals form 1
filter off crystals / pick out crystals AND dry on filter paper / heat in drying oven 1
7(f) 4 (CO2) 1
4(H2O) 1
® IGCSE is a registered trademark.
This syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/41 Paper 4 Theory Extended May/June 2017
MARK SCHEME
Maximum Mark: 80
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
5(e) curve starts from (0,0) and has a steeper gradient than the original curve 1
finishes at the same volume of gas 1
because there are more particles per unit volume / dm3 / cm3 1
because there are more collisions per second / unit time OR a greater collision rate 1
5(f) 360 (cm3) 1
Question Answer Marks
6(a) (compound that) contains carbon and hydrogen 1
and no other elements / only 1
6(b) any 3 from: • same / similar chemical properties • (same) general formula • (consecutive members) differ by CH2 • same functional group • common (allow similar) methods of preparation • physical properties vary in predictable manner / show trends / gradually change / example of a physical property
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/42 Paper 4 Theory (Extended) May/June 2017
MARK SCHEME
Maximum Mark: 80
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
1(b)(i) (substance that) cannot be split up / broken down into (two or more) simpler substances by chemical means OR (substance) made of atoms with the same atomic number / number of protons / proton number
1
1(b)(ii) (two or more) elements joined or combined or bonded (together) 1
1(b)(iii) (particle) containing different numbers of protons and electrons OR atom or group of atoms that has gained or lost an electron / electrons
2(a) atoms of the same element / atoms with the same proton number / atoms with the same atomic number 1
different neutron number / different nucleon number / different mass number 1
2(b)
carbon silicon
proton number 6 14 M1 electronic structure 2,4 2,8,4 M2
nucleon number 12 28
number of neutrons in one atom 6 14 M3
3
2(c)(i) covalent 1
2(c)(ii) award 1 mark for each correct property and one mark for each correct matching reason. 4
property: high melting point / high boiling point reason: bonds between atoms are strong OR covalent bonds are strong / bonds need large amount of energy to break
property: non-conductor / poor conductor(of electricity) / insulator reason: no moving charged particles / no moving ions / no moving electrons / all (outer shell) electrons used in bonding
property: hard reason: bonds between atoms are strong OR covalent bonds are strong
property: brittle reason: bonds between atoms are strong OR covalent bonds are strong / bonds are directional
property: insoluble reason: does not form hydrogen bonds with water / no ions that can be hydrated
2(d)(i) incomplete combustion / incomplete burning / combustion in insufficient air / oxygen 1
of fossil fuels / named fossil fuel / named petroleum fraction / name or formula of a type of substance containing carbon 1
2(d)(ii) toxic / poisonous / combines with or binds to haemoglobin 1
2(e)(ii) carbon dioxide: weak (force of) attraction between molecules / weak intermolecular forces / weak van der Waals’ forces / weak dispersion forces / weak London forces
1
silicon(IV) dioxide: covalent bonds are strong / force of attraction between atoms is strong / no weak bonds (are present) / all bonds are strong
1
(weak) forces of attraction in carbon dioxide need small amounts of energy or heat to break / less energy or heat needed to break forces of attraction in carbon dioxide OR (strong) bonds in silicon(IV) dioxide need large amounts of energy or heat to break / more energy or heat needed to break bonds in silicon(IV) dioxide
1
2(f) 2NaOH + SiO2 → Na2SiO3 + H2O IF full credit is not awarded, allow 1 mark for Na2SiO3 OR 2OH– + SiO2 → SiO3
3(b)(ii) lower yield of NO / lower yield of nitric acid / lower yield of product / equilibrium shifts to left (at higher temperatures) / backward reaction favoured(at higher temperatures) ORA
3(d) add copper(II) carbonate (to acid) until it stops dissolving or no more effervescence / bubbling / fizzing 1
filter (to remove copper(II) carbonate) 1
evaporate / heat / warm / boil / leave in sun AND until most of the water has gone / some water is left / evaporate some of the water / until it is concentrated / saturation (point) / crystallisation point / crystals form on glass rod or microscope slide / crystals start to form
1
(for any solution) leave / allow to cool / allow to crystallise OR (for any crystals) filter / wash / dry with filter paper / dry in warm place / dry in a (low) oven / leave to dry
4(a) any 3 from: • catalyst • more than one / variable oxidation state / oxidation number / valency • form coloured compounds / coloured ions • forms complex ions / complexes
5(c)(ii) 2Na + At2 → 2NaAt M1 formula of NaAt M2 equation fully correct
2
5(d)(i) 393 (kJ) 1
5(d)(ii) 416 (kJ) 1
5(d)(iii) –23 (kJ / mol) 1
Question Answer Marks
6(a)(i) alkene 1
carboxylic acid 1
6(a)(ii) any 2 from: • same / similar chemical properties • (same) general formula • (consecutive members) differ by CH2 • same functional group • common (allow similar) methods of preparation • physical properties vary in predictable manner / show trends / gradually change / example of a physical property
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/43 Paper 4 Theory (Extended) May/June 2017
MARK SCHEME
Maximum Mark: 80
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
2(b)(i) approximately horizontal line draw to right of and below the reagent line 1
energy change shown starting level with the reactant energy AND finishing level with the product energy AND having only one (correct) arrow head AND labelled ∆H / energy change
1
2(b)(ii) (energy required to break bonds =) 3624 1
attraction between (positive) ions and (delocalised / sea of) electrons 1
3(b) electrons 1
move / flow (throughout / through the structure) 1
3(c) layers (of atoms or ions) 1
layers / atoms / ions can slide / slip / glide (over each other) (without breaking the metallic bonds) 1
3(d)(i) magnesium shown as (2, 8) using crosses 1
sulfide shown as (2, 8, 8), with the two gained electrons in the outer shell of sulfur shown as crosses and all other electrons on sulfur shown as dots
1
magnesium ion charge as 2+ AND sulfide charge as 2– 1
4(b)(i) saturated: only single bonds OR no double / multiple bonds (between carbon atoms) 1
hydrocarbon: (compound that) contains carbon and hydrogen 1
hydrocarbon: and no other elements / only 1
4(b)(ii) alkane(s) 1
4(b)(iii) any 2 from: • same / similar chemical properties • (same) general formula • (consecutive members) differ by CH2 • same functional group • common (allow similar) methods of preparation • physical properties vary in predictable manner / show trends / gradually change / example of a physical
property variation
2
4(b)(iv) CO2 and H2O on right-hand side and no other products / reagents 1
4(c)(ii) carbon monoxide: from incomplete combustion (of fuel) 1
oxides of nitrogen: nitrogen (from the air) reacts with oxygen (from the air) 1
oxides of nitrogen: at high temperatures (in engine) OR (electrical) spark (in the engine) 1
4(c)(iii) poisonous / toxic / death 1
4(c)(iv) any 3 from: • oxides of nitrogen are reduced / lose oxygen (to form nitrogen) • oxides of nitrogen form nitrogen • (oxides of nitrogen) react with carbon monoxide • gases (adsorb / stick) on the catalyst’s surface
3
4(d)(i) butane 1
4(d)(ii) (molecules with) the same molecular formula 1
different structural formula / different displayed formula 1
4(d)(iii) UV light / sunlight 1
H–Cl 1
any mono to deca chloro-substituted derivative of methyl propane 1
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/51 Paper 5 Practical Test May/June 2017
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
1(b) initial and final readings completed correctly 1
differences completed correctly 1
all readings to 1 d.p. 1
results comparable to the Supervisor’s results 1
1(c) red / brown / amber / orange 1
1(d) (becomes) yellow / orange / paler 1
1(e) yellow to blue / black 1
1(f)(i) solution C is more concentrated 1
a greater volume of thiosulfate was needed 1
1(f)(ii) ratio of the candidate’s differences from the table in (b) 1
1(g) 1.5 × value from table in (b) for Experiment 2 1
unit: cm3 1
1(h)(i) 2 sources of error, e.g.: • using a measuring cylinder to measure solution C / solution D • only carrying out the experiments once • going past the end-point
2
1(h)(ii) 2 meaningful improvements related to (h)(i): • use a pipette / burette • repeat the experiment • improvement linked to going past the end-point
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/52 Paper 5 Practical Test May/June 2017
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
• weigh mixture (of calcium carbonate and kaolinite) • add (dilute) hydrochloric acid • in excess / continue adding until there is no more fizzing / add until no more gas is evolved • filter • wash residue / kaolinite • dry • weigh residue / kaolinite • (change in mass / initial mass) × 100 (%)
the gas collection / loss of mass method any 6 from:
• weigh mixture (of calcium carbonate and kaolinite) • add (dilute) hydrochloric acid • in excess / continue adding until there is no more fizzing / add until no more gas is evolved • collect gas in a syringe / measure final total mass • measure volume of gas / mass loss • calculate moles of CaCO3 / CO2 • calculate mass of CaCO3 • (mass of CaCO3 / initial mass) × 100 (%)
the calcium chloride method any 4 from:
• weigh mixture (of calcium carbonate and kaolinite) • add (dilute) hydrochloric acid • in excess / continue adding until there is no more fizzing / add until no more gas is evolved • filter
® IGCSE is a registered trademark.
This syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/53 Paper 5 Practical Test May/June 2017
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
3 any 6 from: • crush lumps • pestle and mortar • weigh cassiterite • heat / reduce • with carbon / CO / more reactive metal, e.g. Zn • weigh tin • (mass of tin / initial mass) × 100 (%)
6
® IGCSE is a registered trademark.
This syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/61 Paper 6 Alternative to Practical May/June 2017
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
2(d) 1.5 × value from table in (b) for Experiment 2 1
unit: cm3 1
2(e)(i) 2 sources of error, e.g.: • using a measuring cylinder to measure solution C / solution D • only carrying out the experiments once • going past the end-point
2
2(e)(ii) 2 meaningful improvements related to (e)(i): • use a pipette / burette • repeat the experiment • improvement linked to going past the end-point
2
Question Answer Marks
3(a) solid spits out of the tube / the tube might crack 1
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/62 Paper 6 Alternative to Practical May/June 2017
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
• weigh mixture (of calcium carbonate and kaolinite) • add (dilute) hydrochloric acid • in excess / continue adding until there is no more fizzing / add until no more gas is evolved • filter • wash residue / kaolinite • dry • weigh residue / kaolinite • (change in mass / initial mass) × 100 (%)
the gas collection / loss of mass method any 6 from:
• weigh mixture (of calcium carbonate and kaolinite) • add (dilute) hydrochloric acid • in excess / continue adding until there is no more fizzing / add until no more gas is evolved • collect gas in a syringe / measure final total mass • measure volume of gas / mass loss • calculate moles of CaCO3 / CO2 • calculate mass of CaCO3 • (mass of CaCO3 / initial mass) × 100 (%)
the calcium chloride method any 4 from:
• weigh mixture (of calcium carbonate and kaolinite) • add (dilute) hydrochloric acid • in excess / continue adding until there is no more fizzing / add until no more gas is evolved • filter
1
® IGCSE is a registered trademark.
This syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.
Cambridge International Examinations Cambridge International General Certificate of Secondary Education
CHEMISTRY 0620/63 Paper 6 Alternative to Practical May/June 2017
MARK SCHEME
Maximum Mark: 40
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2017 series for most Cambridge IGCSE®, Cambridge International A and AS Level and Cambridge Pre-U components, and some Cambridge O Level components.
4 any 6 from: • crush lumps • pestle and mortar • weigh cassiterite • heat / reduce • with carbon / CO / more reactive metal, e.g. Zn • weigh tin • (mass of tin / initial mass) × 100 (%)