(IGCSE) Chemistry Feb/March 2017 paper 3 variant 2
Question paper found on page 12 / 16 pages total, pdf
) 300 sodium chloride 6 sodium hydroxide 9 water 685 total 1000 (i) Calculate the mass of sodium hydroxide present in 200 g of this solution. [1] (ii) All the water from the 1000 g of solution is evaporated. Deduce the mass of the remaining mixture. [1] [Total: 10] © UCLES 2017 0620/32/F/M/17
(IGCSE) Chemistry May/June 2020 paper 4 variant 1
Mark scheme found on page 8 / 9 pages total, pdf
1000 = 0.0005 × = 0.025 (mol / dm3) 20.0 20.0 allow ecf 4(d)(iii) 2 M1 use of 40 g/mol M2 40 × 0.04 = 1.6 (g/dm3) Question 5(a) © UCLES 2020 Answer M1 sugar(s) M2 fermentation M3 ethene M4 hydration Marks 4 Page 8 of 9
(IGCSE) Chemistry May/June 2017 paper 3 variant 3
Question paper found on page 3 / 16 pages total, pdf
................................... [1] (iv) Calculate the mass of hydrogencarbonate ions present in 250 cm 3 of this sample. mass of hydrogencarbonate ions = .............................. mg [1] © UCLES 2017 0620/33/M/J/17 [Turn over
(IGCSE) Chemistry May/June 2017 paper 3 variant 2
Question paper found on page 3 / 16 pages total, pdf
.............................................................................................................................. [1] 0620/32/M/J/17 [Turn over
(IGCSE) Chemistry May/June 2017 paper 3 variant 1
Question paper found on page 3 / 16 pages total, pdf
..................................................................................................................... [1] © UCLES 2017 0620/31/M/J/17 [Turn over
(IGCSE) Chemistry Oct/Nov 2018 paper 3 variant 1
Question paper found on page 3 / 16 pages total, pdf
3 2 (a) The table shows the ions present in a 1000 cm 3 sample of blood plasma. ion present formula of ion mass present in the 1000 cm 3 sample / g sodium Na + 3.25 potassium K + 0.16 calcium Ca 2+ 0.10 magnesium Mg 2+ 0.04 chloride Cl – 3.65 hydrogencarbonate HCO 3 – 1.50 phosphate PO 4
(IGCSE) Chemistry May/June 2022 paper 4 variant 2
Mark scheme found on page 6 / 9 pages total, pdf
M2 Mol Ca(OH)2 = M1 / 2 = 0.00100 / 2 = 0.0005(00) M3 M2 1000 / 25 = 0.0005(00) 40 = 0.02(00) M4 Mr Ca(OH)2 = 74 M5 M4 M3 = 74 0.02 = 1.48 (g / dm3) Question
(IGCSE) Chemistry Feb/March 2021 paper 4 variant 2
Mark scheme found on page 7 / 10 pages total, pdf
0620/42 Cambridge IGCSE – Mark Scheme PUBLISHEDMarch 2021 AnswerMarks Question 4(a)Zn(s) + 2HCl(aq) ZnCl2(aq) + H2(g) ZnCl2 or H2 as a product (1) correct equation (1) states (1)3 4(b)to make sure all the (hydrochloric) acid reacts1 4(c)filtration1 4(d)a solution that can dissolve no more solute (1)2
(IGCSE) Chemistry Oct/Nov 2018 paper 3 variant 3
Question paper found on page 3 / 20 pages total, pdf
3 2 (a) T he table shows the concentrations of the ions present in the solution obtained from squid nerve cells and in human blood plasma. solution obtained from squid nerve cells human blood plasma concentration in g / 1000 cm 3 concentration in g / 1000 cm 3 sodium 1.15 3.25 potassium 15.60 0.16 magnesium 0.03 0.04 chloride 3.55
(IGCSE) Chemistry Oct/Nov 2018 paper 4 variant 2
Mark scheme found on page 7 / 9 pages total, pdf
M2 5(.00) × 10 –3 / 2 = 2.5(.0) × 10 –3 or 0.0025(0) (mol) M3 2.5(.0) × 10 –3 × 1000 / 20 = 0.125 (mol / dm 3 ) M4 0.125 × 98 = 12.25 (g / dm 3 ) 3(e) M1 Mol FeSO
(IGCSE) Chemistry Oct/Nov 2018 paper 3 variant 2
Question paper found on page 3 / 16 pages total, pdf
3 2 (a) T he table shows the concentrations of the ions present in a solution obtained from cells in the body. ion present formula of ion concentration in mg / 1000 cm 3 sodium Na + 273 potassium K + 540 calcium Ca 2+ 3 magnesium Mg 2+ 20 chloride Cl 140 hydrogencarbonate HCO 3– 730 phosphate PO 43– 1 – Answer these questions
(IGCSE) Chemistry Feb/March 2019 paper 3 variant 2
Question paper found on page 5 / 16 pages total, pdf
..................................................................................................................... [2] © UCLES 2019 0620/32/F/M/19 [Turn over
(IGCSE) Chemistry Oct/Nov 2011 paper 6 variant 1
Question paper found on page 14 / 16 pages total, pdf
14 0620/61/O/N/11 © UCLES 2011 For Examiner’s Use 6 Seawater contains sodium chloride and other salts. Plan an experiment to fi nd the mass of salts in 1 dm 3 of seawater. You will be provided with a small bottle of seawater. You should include details of the method and any apparatus used. (1 dm 3 = 1000 cm 3 ) .
(IGCSE) Chemistry May/June 2022 paper 5 variant 1
Mark scheme found on page 7 / 7 pages total, pdf
0620/51Cambridge IGCSE – Mark Scheme PUBLISHED QuestionAnswer 3 Marks 6 filter the water and any five from: specified / known / measured volume of water / filtrate placed in a suitable container and heated in this container (evaporating basin/beaker) heat/warm (to evaporate water) (heat) until all water gone / dryness / constant mass find mass of solid left concentration
(IGCSE) Chemistry May/June 2017 paper 5 variant 2
Ir found on page 2 / 8 pages total, pdf
0 cm 3 , labelled solution C (g) access to water and distilled water (h) white tile (i) funnel for filling burette Note: Ammonium iron( II ) sulfate is used because it is more stable than iron( II ) sulfate. The Question Paper will refer to solution B and solution C as iron( II ) sulfate. © UCLES 2017 0620/52/CI/M/J/17
(IGCSE) Chemistry Feb/March 2022 paper 5 variant 2
Mark scheme found on page 7 / 7 pages total, pdf
0620/52Cambridge IGCSE – Mark Scheme PUBLISHED QuestionAnswer 3 © UCLES 2022 any 6 from: • known/specified volume of fizzy drink • warmed/heated • in a suitable container • gas collected in inverted measuring cylinder over water or in a (gas) syringe • until no more gas collected / all carbon dioxide given off / no more bubbles • volume of gas measured/recorded • volume of gas
(IGCSE) Chemistry Oct/Nov 2013 paper 5 variant 3
Confidential instructions found on page 2 / 8 pages total, pdf
(g) access to water and distilled water (h) one 10 cm 3 measuring cylinder (i) a white tile (j) two test-tubes (k) aqueous ammonia of concentration 1.0 mol / dm 3 (l) one funnel for fi lling burette (m) access to a clock or stopwatch 25 cm 3 of solution D should require approximately 16 cm 3 of solution C for the end-point.
(IGCSE) Chemistry Oct/Nov 2021 paper 4 variant 2
Mark scheme found on page 6 / 11 pages total, pdf
H2O(l) + CO2(g) reactant states (1) product states (1)2 2(b)(ii)M1 125 M2 2.5 / 125 = 0.02(00) M3 0.02(00) × 2 = 0.04(00) M4 0.04(00) × 1000 / 20 = 2(.00)4 © UCLES 2021 Page 6 of 11
(IGCSE) Chemistry May/June 2018 paper 3 variant 2
Question paper found on page 11 / 16 pages total, pdf
.............................................................................................................. [1] [Total: 8] © UCLES 2018 0620/32/M/J/18 [Turn over
(IGCSE) Chemistry Oct/Nov 2007 paper 3
Question paper found on page 9 / 16 pages total, pdf
9 © UCLES 2007 0620/03/O/N/07 [Turn over For Examiner's Use (iv) Determine the heat of combustion of butan-1-ol by plotting the heats of combustion of the first three alcohols against the number of carbon atoms per molecule. –700 –800 –900 –1000 –1100 –1200 –1300 –1400 –1500
(IGCSE) Chemistry May/June 2004
Mark scheme found on page 15 / 21 pages total, pdf
2 = 0.005 [1] (iii) Mark conseq to (ii) max 10M concentration of acid = 0.005 x 1000/20 [1] = 0.25 mol/dm 3 [1] TOTAL = [10] TOTAL for PAPER = [11] + [14] + [10] + [11] + [10] + [13] + [11] = [80]
(IGCSE) Chemistry May/June 2007 paper 2
Question paper found on page 14 / 16 pages total, pdf
M/J/07 For Examiner's Use (f) Each electrolysis cell makes 212 kg of aluminium per day from 400 kg of aluminium oxide. Calculate how much aluminium can be made from 1 tonne (1000 kg) of aluminium oxide. [1] (g) Complete the following sentences about the electrolysis of aluminium oxide using words from the following list. atoms gaseous molten solid ions molecules Aluminium oxide conducts
(IGCSE) Chemistry May/June 2022 paper 5 variant 1
Question paper found on page 7 / 12 pages total, pdf
..................................................................................................................... [6] © UCLES 2022 0620/51/M/J/22 [Turn over
(IGCSE) Chemistry Feb/March 2017 paper 4 variant 2
Question paper found on page 10 / 16 pages total, pdf
................................................................................................................. [2] [Total: 12] © UCLES 2017 0620/42/F/M/17
(IGCSE) Chemistry Feb/March 2022 paper 5 variant 2
Question paper found on page 7 / 12 pages total, pdf
..................................................................................................................... [6] © UCLES 2022 0620/52/F/M/22 [Turn over
(IGCSE) Chemistry Oct/Nov 2016 paper 4 variant 1
Mark scheme found on page 6 / 7 pages total, pdf
M1 at least one correct ester linkage between boxes M2 at least two boxes shown and sufficient correct C and O atoms to make two correct ester linkages M3 continuation bond(s) AND if more than one repeat unit is shown, the repeat unit must be correctly identified 1 1 1 Question Answer Marks 7(a) 0.025 M1 50 / 1000 (=0.05) M2 (0
(IGCSE) Chemistry Oct/Nov 2015 paper 6 variant 1
Question paper found on page 3 / 16 pages total, pdf
3 0620/61/O/N/15 © UCLES 2015 [Turn over 2 The alkanes are a homologous series of hydrocarbons which are used as fuels. Their general formula is C n H 2n+2 . The energy released when equal amounts of the fi rst fi ve alkanes were burned was measured. The results are shown plotted on the grid below. 123 value of n in general formula
(IGCSE) Chemistry May/June 2014 paper 2 variant 3
Question paper found on page 4 / 20 pages total, pdf
................................................................................................................. [1] [Total: 10] © UCLES 2014 0620/23/M/J/14
(IGCSE) Chemistry Oct/Nov 2013 paper 3 variant 3
Question paper found on page 8 / 12 pages total, pdf
8 0620/33/O/N/13 © UCLES 2013 For Examiner’s Use 5 Domestic rubbish is disposed of in land fi ll sites. Rubbish could include the following items. item of rubbish approximate time for item to break down newspaper one month cotton rag six months woollen glove one year aluminium container up to 500 years styrofoam cup 1000 years (a) Explain why aluminium, a
(IGCSE) Chemistry Oct/Nov 2014 paper 6 variant 1
Mark scheme found on page 4 / 4 pages total, pdf
Page 4 Mark Scheme Syllabus Paper Cambridge IGCSE – October / November 2014 0620 61 © Cambridge International Examinations 2014 5 (c) no reaction / no change / no precipitate (1) [1] (d) white (1) precipitate (1) [2] (e) transition metal present (1) allow: iron water / hydrated (1) [2] (f) hydrated (1) iron (1) (
(IGCSE) Chemistry May/June 2004
Examiner report found on page 14 / 18 pages total, pdf
0620 Chemistry June 2004 14 Question 7 (a) Very poorly answered, on many scripts the comment was - the mass of the substance divided by its relative molecular mass. The standard definition is: A mole of a substance is the amount of that substance that contains the same number of particles (atoms, ions or molecules) as there are atoms of 12 C in 12.000g
(IGCSE) Chemistry Oct/Nov 2011 paper 2 variant 1
Mark scheme found on page 4 / 8 pages total, pdf
Page 4 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – October/November 2011 0620 21 © University of Cambridge International Examinations 2011 4 (a) ethene decolourises (bromine water) / bromine goes colourless in ethane [1] ethane does not / no change / remains reddish-brown [1] allow: only ethene decolourises bromine = 2 ignore: ethene reacts and ethane does not (b) (i)
(IGCSE) Chemistry May/June 2022 paper 4 variant 3
Mark scheme found on page 9 / 11 pages total, pdf
0620/43Cambridge IGCSE – Mark Scheme PUBLISHED QuestionAnswer 4(f) C6H12O2 Question 5(a) May/June 2022 Marks 1 Answer (lattice of) positive ions (1) Marks 3 sea of / delocalised / mobile electrons (1) attraction between positive ions and electrons (1) 5(b) copper (1) 3 spoon (1) (aqueous or solution) of named copper salt (1) 5(c
(IGCSE) Chemistry May/June 2014 paper 3 variant 3
Mark scheme found on page 5 / 5 pages total, pdf
Page 5 Mark Scheme IGCSE – May/June 2014 Syllabus 0620 (e) (i) light or lead tetraethyl / catalyst / high temperature (1) (ii) CH 3 –CHCl–CH 3 (1) Paper 33 [1] [1] [Total: 16] 7 (a) bauxite (1) [1] (b) electrolyte alumina / aluminium oxide dissolved in molten cryolite (1) use cryolite to reduce mp
(IGCSE) Chemistry Oct/Nov 2004 paper 2
Question paper found on page 13 / 16 pages total, pdf
13 UCLES 2004 0620/02/O/N/04 [Turn over For Examiner’s Use (d) If chlorine is allowed to mix with sodium hydroxide, sodium chlorate( I ), NaOC l is formed. Balance the equation for this reaction. C l 2 +NaOH NaC l + NaOC l +H 2 O [1] (e) One tonne (1 000 kg) of a commercial solution of
(IGCSE) Chemistry Oct/Nov 2016 paper 3 variant 2
Question paper found on page 4 / 20 pages total, pdf
4 2 The bar charts compare the concentrations of ions in two samples of water, sample A and sample B. sample A 20 20 15 15 10 10 5 0 sample B Na + Ca 2+ K + Mg 2+ SiO 32– Cl – HCO 3– 5 0 Na + Ca 2+ K + Mg 2+ SiO 32– Cl – HCO 3– (a) Use the
(IGCSE) Chemistry May/June 2017 paper 4 variant 3
Mark scheme found on page 8 / 8 pages total, pdf
M1 formula of NaNO 3 M2 equation fully correct 2 6(b)(ii) filter 1 wash (the residue) using water 1 dry the residue between filter papers / in a warm place 1 M r = 197 1 (9.85 / 197 =) 0.05 (mol) 1 6(c)(ii) 0.05 (mol) 1 6(c)(iii) (0.05 × 24) =
(IGCSE) Chemistry Oct/Nov 2016 paper 3 variant 1
Question paper found on page 4 / 16 pages total, pdf
4 2 The bar charts compare the concentrations of the main ions in two samples of seawater, sample A and sample B. sample A 20 15 15 10 10 5 0 sample B 20 Na + Ca 2+ K + Mg 2+ SiO 32– Cl – HCO 3– 5 0 Na + Ca 2+ K + Mg 2+ SiO 32– Cl – HCO 3– (a)
(IGCSE) Chemistry May/June 2013 paper 2 variant 1
Question paper found on page 13 / 16 pages total, pdf
..................................................................................................................... [2] © UCLES 2013 0620/21/M/J/13 [Turn over
(IGCSE) Chemistry May/June 2007 paper 3
Mark scheme found on page 5 / 6 pages total, pdf
Page 5 Mark Scheme Syllabus Paper IGCSE – May/June 2007 0620 3 © UCLES 2007 6 (a) alumina or aluminium oxide [1] sodium aluminate [1] iron( III ) oxide [1] filtration or centrifuge NOT conditional [1] (b) from left to right: carbon cathode or carbon negative electrode [1] 900 to 1000 o C [1] aluminium [1] cryolite
(IGCSE) Chemistry May/June 2019 paper 4 variant 1
Mark scheme found on page 7 / 9 pages total, pdf
M1 mol of HCl = 2.00 × M2 mol of MgCO3 = M1 2 May/June 2019 Marks 4 50.0 = 0.1(00) mol (1) 1000 = 0.1(00) / 2 = 0.05(00) (1) M3 Mr of MgCO3 = 84 (1) M4 mass of MgCO3 = M3 × M2 = 84 × 0
(IGCSE) Chemistry Oct/Nov 2016 paper 4 variant 2
Mark scheme found on page 4 / 7 pages total, pdf
M1 M r of MnO 2 : 87 M2 moles of MnO 2 used: 3.48 / 87 = 0.04 M3 moles of HC l needed: 0.04 × 4 = 0.16 M4 volume of HC l needed: (0.16 / 8.0) × 1000 AND 20 cm 3 4 5(b)(i) from colourless to yellow / orange / brown 2
(IGCSE) Chemistry Oct/Nov 2014 paper 2 variant 1
Question paper found on page 3 / 16 pages total, pdf
3 0620/21/O/N/14 © UCLES 2014 [Turn over 2 The diagram shows a bottle of mineral water. The concentration of the ions present in the water is shown on the label. The pH of the water is also shown. poly(ethene) bottle ions present pH = 6.6 chloride, C l – X , F – magnesium, Mg 2+ manganese, Mn 2+ Y
(IGCSE) Chemistry Oct/Nov 2007 paper 3
Mark scheme found on page 6 / 6 pages total, pdf
Page 6 Mark Scheme Syllabus Paper IGCSE – October/November 2007 0620 03 © UCLES 2007 (b) (i) from origin [1] gradient decreases until = 0 [1] therefore has to be a curve (ii) mass of one mole of CaCO 3 = 100 number of moles of CaCO 3 = 0.3/100 = 0.003 [1] moles of HC l
(IGCSE) Chemistry May/June 2015 paper 6 variant 3
Mark scheme found on page 4 / 4 pages total, pdf
Page 4 Mark Scheme Cambridge IGCSE – May/June 2015 Question 4(k) 4(l) Answer Marks temperature change lower / halved; volume of acid larger / doubled; 2 source: measuring cylinder / thermometer / heat losses; improvement: use burette / digital thermometer / insulate / lag; 2 Question 5(c) Syllabus 0620 Answer Marks red brown; precipitate; no change; 3 5(d) red brown precipitate
(IGCSE) Chemistry Oct/Nov 2007 paper 3
Question paper found on page 5 / 16 pages total, pdf
5 © UCLES 2007 0620/03/O/N/07 [Turn over For Examiner's Use 4 Zinc is extracted from zinc blende, ZnS. (a) Zinc blende is heated in air to give zinc oxide and sulphur dioxide. Most of the sulphur dioxide is used to make sulphur trioxide. This is used to manufacture sulphuric acid. Some of the acid is used in the plant, but most of
(IGCSE) Chemistry Feb/March 2018 paper 4 variant 2
Mark scheme found on page 6 / 8 pages total, pdf
M2 (M r of NaNO 3 =) 85 M3 (85 × 4(.00) × 10 –3 =) 0.34 (g) M4 (0.34 × 90 / 100 =) 0.306 (g) OR 0.31 (g) 2(c)(v) 2NaNO 3 → 2NaNO 2 + O 2 M1 = NaNO 2 M2 = rest of equation Question 2
(IGCSE) Chemistry Oct/Nov 2015 paper 5 variant 3
Confidential instructions found on page 2 / 8 pages total, pdf
M (e) 75 cm 3 of aqueous potassium manganate( VII ), KMnO 4 , of concentration 8.0 g / dm 3 labelled solution N (f) 100 cm 3 of aqueous iron( II ) ammonium sulfate-6-water, (NH 4 ) 2 Fe(SO 4 ) 2 .6H 2 O, of concentration 40 g / dm 3 made by dissolving 40 g of the salt in 1
(IGCSE) Chemistry May/June 2006 paper 2
Question paper found on page 11 / 16 pages total, pdf
M/J//06 [Turn Over For Examiner's Use (b) The soil contained large amounts of calcium ions and carbonate ions. (i) Use the information in the diagram to suggest where these ions came from. [1] (ii) Complete the word equation for the reaction of calcium carbonate with hydrochloric acid. calcium carbonate ++ hydrochloric acid calcium chloride ................. ...
(IGCSE) Chemistry Feb/March 2022 paper 4 variant 2
Mark scheme found on page 6 / 9 pages total, pdf
M1 mol HCl = 0.400 × 25.0 / 1000 = 0.01(00) M2 mol CO2 = M1 / 2 = 0.0100 / 2 = 0.005(00) M3 volume CO2 = M2 × 24000 = 120 (cm3)3 Question Answer Marks 3(a)nitrogen (from air) and oxygen (from air) react react due to
(IGCSE) Chemistry Oct/Nov 2014 paper 2 variant 2
Mark scheme found on page 5 / 6 pages total, pdf
in top compartment; [1] allow : X in top pipe F outside or in bottom right pipe; [1] M outside or in bottom left pipe; [1] (ii) C 2 H 4 [1] H 2 [1] (iii) high temperature [1] allow : heat / stated temperatures between 200–1000 °C catalyst [1] ignore : names of incorrect catalysts [Total: 14]
(IGCSE) Chemistry Oct/Nov 2016 paper 3 variant 2
Mark scheme found on page 3 / 9 pages total, pdf
Page 3 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0620 32 © UCLES 2016 Question Answer Mark 2(a)(iii) 1.5 mg = [2] 100 (15) 1000 × = [1] OR 0.1 × (15) = [1] 2 2(b) test: add (nitric acid and) silver nitrate result: white precipitate 1 1 2(c)
(IGCSE) Chemistry May/June 2016 paper 4 variant 2
Question paper found on page 9 / 12 pages total, pdf
M/J/16 © UCLES 2016 [Turn over 6 Zinc is extracted from an ore called zinc blende, which consists mainly of zinc sulfide, ZnS. (a) (i) The zinc sulfide in the ore is first converted into zinc oxide. Describe how zinc oxide is made from zinc sulfide. ........................................
(IGCSE) Chemistry Oct/Nov 2007
Examiner report found on page 12 / 18 pages total, pdf
(d) Only about half the candidates were able to score in this question. (i) Some named the ester as ethyl methanoate not methyl ethanoate. (ii) The acid was often given in the form of its pot assium salt or as imaginary chromium compounds of the acid. (iii) Ethane was often given instead of ethene. Question 7 (a) The theory of rates of reaction was well under stood but
(IGCSE) Chemistry Oct/Nov 2013 paper 2 variant 3
Mark scheme found on page 4 / 6 pages total, pdf
Page 4 Mark Scheme Syllabus Paper IGCSE – October/November 2013 0620 23 © Cambridge International Examinations 2013 (e) (i) decolourises / goes colourless [1] IGNORE : goes clear (ii) B [1] (iii) 4 th box ticked (polymerisation) [1] (f) (i) C 7 H 16 [1] (ii) substance containing carbon and hydrogen only [1] (g) carbon
(IGCSE) Chemistry Oct/Nov 2016 paper 3 variant 1
Mark scheme found on page 3 / 8 pages total, pdf
Page 3 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0620 31 © UCLES 2016 Question Answer Mark 2(a)(i) any 2 from: • more Na + ions in sample B ORA • more C l – ions in sample B ORA • more Mg 2+ ions in sample B ORA • more HCO 3 – ions in sample A ORA • more Ca 2+
(IGCSE) Chemistry Oct/Nov 2003 paper 2
Question paper found on page 15 / 20 pages total, pdf
15 0620/2/O/N/03 [Turn over 6 Aluminium is extracted from its ore, bauxite. The bauxite is purified to give aluminium oxide. Electrolysis is then used to extract the aluminium from aluminium oxide dissolved in cryolite. The melting point of pure aluminium oxide is 2070 °C. The melting point of the mixture of aluminium oxide and cryolite is about 1000 °C. (a)
(IGCSE) Chemistry May/June 2014 paper 3 variant 1
Question paper found on page 4 / 16 pages total, pdf
.................................................................................................................. [1] [Total: 7] © UCLES 2014 0620/31/M/J/14
(IGCSE) Chemistry Oct/Nov 2008 paper 1
Question paper found on page 7 / 16 pages total, pdf
7 © UCLES 2008 0620/01/O/N/08 [Turn over 14 Copper and hydrogen can each be formed by electrolysis. At which electrodes are these elements formed? copper hydrogen A anode anode B anode cathode C cathode anode D cathode cathode 15 When solid X is dissolved in water, an endothermic change takes place. When 5 g of X are dissolved in 1000 cm 3
(IGCSE) Chemistry May/June 2015 paper 3 variant 3
Mark scheme found on page 5 / 10 pages total, pdf
Page 5 Question 4(a)(i) 4(a)(ii) 4(b)(i) Mark Scheme Cambridge IGCSE – May/June 2015 Answer Syllabus 0620 Marks I ethane / oil / naphtha / coal / gas 1 R coke / bitumen / lubricating oil / wood (burn to) release energy; take a long time to form (from organic material); 2 If time stated 1000 years or more
(IGCSE) Chemistry May/June 2016 paper 4 variant 2
Mark scheme found on page 8 / 9 pages total, pdf
M1 heat produced by carbon / coke (burning in) oxygen / air; OR C + O 2 → CO 2 produces heat / exothermic; OR 2C + O 2 → 2CO produces heat / exothermic (scores M1 and M2 ); M2 C + CO 2 → 2CO; OR 2C + O 2 → 2CO; M3 ZnO + CO → Zn + CO 2 ; OR ZnO
(IGCSE) Chemistry Oct/Nov 2018
Examiner report found on page 15 / 66 pages total, pdf
Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2018 Principal Examiner Report for Teachers (ii) Many candidates named potassium chloride correctly. Others misread the table and chose magnesium chloride. A significant number suggested potassium chlorine. In order to improve their marks when naming compounds, candidates should be encouraged to use the pattern that in a compound of a metal with a non-metal, the non-metal changes
(IGCSE) Chemistry May/June 2015 paper 2 variant 1
Mark scheme found on page 7 / 9 pages total, pdf
Page 7 Question 5(a) Mark Scheme Cambridge IGCSE – May/June 2015 Answer Syllabus 0620 Marks Paper 21 Guidance COOH group circled; 1 5(b)(i) 30; 1 5(b)(ii) speeds up reaction / increases rate (of reaction); 1 A lowers the activation energy / allows the reaction to occur by more favourable mechanism 5(b)(iii) poisonous / toxic / death; 1
(IGCSE) Chemistry Feb/March 2019 paper 5 variant 2
Confidential instructions found on page 3 / 8 pages total, pdf
/ dm 3 ● access to water and distilled water ● 25 cm 3 measuring cylinder ● 10 cm 3 measuring cylinder ● 250 cm 3 conical flask ● 50 cm 3 burette with stand and clamp ● white tile ● funnel for filling burette ● 2 test-tubes in a test-tube rack ● teat pipette © UCLES 2019 0620/52/CI/F/M/19 [Turn over
(IGCSE) Chemistry Feb/March 2017 paper 4 variant 2
Mark scheme found on page 4 / 6 pages total, pdf
M1 Cu 2+ ions on left 1 M2 rest of equation correct and correctly balanced (Cu 2+ + 2e – → Cu scores [2]) 1 M1 anode mass decreases 1 M2 copper lost as ions OR copper (atoms) becomes ions OR Cu → Cu 2+ + 2e – 1 M3 cathode mass increases 1 M4 copper deposited / layer of copper forms / copper collected at cathode
(IGCSE) Chemistry May/June 2007
Examiner report found on page 8 / 19 pages total, pdf
(c) Most candidates obtained the mark here. (d) Only about a third of the candidat es explained the electrolytic r eduction being related to the high reactivity of aluminium. Many suggested that it was to do with the high melting point (rather than the very high temperature required for carbon r eduction of a reactive metal). A considerable proportion of candidates tried to make a link with rates of reaction.
(IGCSE) Chemistry May/June 2003 paper 2
Mark scheme found on page 9 / 18 pages total, pdf
Page 2 Mark Scheme Syllabus Paper IGCSE EXAMINATIONS – June 2003 0620 3 © University of Cambridge Local Examinations Syndicate 2003 2 (a) (i) 3 ignore any charges [1] (ii) high melting or boiling point hard poor conductor of electricity or heat brittle Any TWO NOT insoluble, dull, or malleable [2] (iii) carbon, graphite diamond silicon, germanium silicon ( IV ) oxide or
(IGCSE) Chemistry Oct/Nov 2013 paper 2 variant 2
Mark scheme found on page 5 / 6 pages total, pdf
Page 5 Mark Scheme Syllabus Paper IGCSE – October/November 2013 0620 22 © Cambridge International Examinations 2013 6 (a) Any three of: [3] evaporates or evaporation (from garlic) / idea of change from liquid to gas / movement of particles / atoms / molecules / diffusion / particles (in garlic smell) collide (with air particles) / spreading out or mixing up of particles /
(IGCSE) Chemistry May/June 2010 paper 3 variant 3
Mark scheme found on page 5 / 6 pages total, pdf
Page 5 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – May/June 2010 0620 33 © UCLES 2010 6 (a) (i) T l 2 S [1] (ii) T l C l 3 [1] (b) filter / centrifuge / decant wash the precipitate dry the solid / heat the solid (in oven) / press between filter paper [3] all three stated but
(IGCSE) Chemistry May/June 2003 paper 6
Mark scheme found on page 9 / 18 pages total, pdf
Page 2 Mark Scheme Syllabus Paper IGCSE EXAMINATIONS – June 2003 0620 3 © University of Cambridge Local Examinations Syndicate 2003 2 (a) (i) 3 ignore any charges [1] (ii) high melting or boiling point hard poor conductor of electricity or heat brittle Any TWO NOT insoluble, dull, or malleable [2] (iii) carbon, graphite diamond silicon, germanium silicon ( IV ) oxide or
(IGCSE) Chemistry May/June 2003 paper 1
Mark scheme found on page 9 / 18 pages total, pdf
Page 2 Mark Scheme Syllabus Paper IGCSE EXAMINATIONS – June 2003 0620 3 © University of Cambridge Local Examinations Syndicate 2003 2 (a) (i) 3 ignore any charges [1] (ii) high melting or boiling point hard poor conductor of electricity or heat brittle Any TWO NOT insoluble, dull, or malleable [2] (iii) carbon, graphite diamond silicon, germanium silicon ( IV ) oxide or
(IGCSE) Chemistry May/June 2003 paper 5
Mark scheme found on page 9 / 18 pages total, pdf
Page 2 Mark Scheme Syllabus Paper IGCSE EXAMINATIONS – June 2003 0620 3 © University of Cambridge Local Examinations Syndicate 2003 2 (a) (i) 3 ignore any charges [1] (ii) high melting or boiling point hard poor conductor of electricity or heat brittle Any TWO NOT insoluble, dull, or malleable [2] (iii) carbon, graphite diamond silicon, germanium silicon ( IV ) oxide or
(IGCSE) Chemistry May/June 2003 paper 3
Mark scheme found on page 9 / 18 pages total, pdf
Page 2 Mark Scheme Syllabus Paper IGCSE EXAMINATIONS – June 2003 0620 3 © University of Cambridge Local Examinations Syndicate 2003 2 (a) (i) 3 ignore any charges [1] (ii) high melting or boiling point hard poor conductor of electricity or heat brittle Any TWO NOT insoluble, dull, or malleable [2] (iii) carbon, graphite diamond silicon, germanium silicon ( IV ) oxide or
(IGCSE) Chemistry May/June 2010 paper 3 variant 2
Mark scheme found on page 5 / 6 pages total, pdf
Page 5 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – May/June 2010 0620 32 © UCLES 2010 6 (a) (i) T l 2 S [1] (ii) T l C l 3 [1] (b) filter / centrifuge / decant wash the precipitate dry the solid / heat the solid (in oven) / press between filter paper [3] all three stated but
(IGCSE) Chemistry May/June 2012 paper 3 variant 2
Mark scheme found on page 3 / 6 pages total, pdf
Page 3 Mark Scheme: Teachers’ version IGCSE – May/June 2012 Syllabus 0620 Paper 32 (e) (lattice) positive ions / cations / metal ions and sea of electrons / delocalised or free or mobile or moving electrons; [1] [1] attraction between positive ions and electrons; 4 (a) (i) oxygen; carbon dioxide / fluorine / carbon monoxide; [1] [1] (ii) decrease
(IGCSE) Chemistry May/June 2012 paper 3 variant 3
Mark scheme found on page 3 / 6 pages total, pdf
Page 3 Mark Scheme: Teachers’ version IGCSE – May/June 2012 Syllabus 0620 Paper 33 (e) (lattice) positive ions / cations / metal ions and sea of electrons / delocalised or free or mobile or moving electrons; [1] [1] attraction between positive ions and electrons; 4 (a) (i) oxygen; carbon dioxide / fluorine / carbon monoxide; [1] [1] (ii) decrease
(IGCSE) Chemistry Feb/March 2017
Examiner report found on page 9 / 20 pages total, pdf
Cambridge International General Certificate of Secondary Education 0620 Chemistry March 2017 Principal Examiner Report for Teachers (b) Few candidates recognised that an electron is removed when a chloride ion is converted into a chlorine atom. The commonest error was to suggest hydrogen. Other common errors included oxygen or ion, which was sometimes written as “iron”. (c) Many candidates completed the electronic structure of chlorine successfully. The commonest
(IGCSE) Chemistry Oct/Nov 2018
Examiner report found on page 38 / 66 pages total, pdf
Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2018 Principal Examiner Report for Teachers (e) (i) Most candidates showed that both carbon dioxide and water were produced. Only the better performing candidates produced a fully correct balanced equation. It was common for the other products to be incorrect or for one or more of the formulae to be incorrect. It is important that candidates are able to
(IGCSE) Chemistry Oct/Nov 2016
Examiner report found on page 19 / 58 pages total, pdf
Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2016 Principal Examiner Report for Teachers Comments on specific questions Question 1 (a) (i) The commonest errors were to suggest copper or argon. Fewer candidates muddled the flame colour with sodium or lithium. (ii) A minority of candidates selected copper as being pinkish-brown in colour. The commonest incorrect answer was to suggest iron. Nickel and zinc
(IGCSE) Chemistry May/June 2014
Examiner report found on page 13 / 48 pages total, pdf
Cambridge International General Certificate of Secondary Education 0620 Chemistry June 2014 Principal Examiner Report for Teachers © 2014 (b) It was clear that candidates knew the salt given by hydrochloric acid and they realised that this was from a carbonate and acid general equation. So me candidates gave hydrogen instead of water. (c) This was again well answered. However, some candidates did state that the volume was
(IGCSE) Chemistry Oct/Nov 2018
Examiner report found on page 22 / 66 pages total, pdf
Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2018 Principal Examiner Report for Teachers Many candidates need more practice in answering questions involving extended answers such as Question 3(a)(i), the separation of copper and selenium and Question 5(a), the arrangement and motion of particles in a liquid and a gas. In Question 3(a) better performing candidates gave well-reasoned and step-by-step
(IGCSE) Chemistry May/June 2017
Examiner report found on page 23 / 55 pages total, pdf
Cambridge International General Certificate of Secondary Education 0620 Chemistry June 2017 Principal Examiner Report for Teachers (iv) Most candidates identified the Group IV element. A was the most common incorrect answer. (v) Many candidates identified the atom of a metallic element. The most frequently seen incorrect answers showed a lack of understanding that most metallic elements are on the left-hand side of the Periodic Table so have 1
(IGCSE) Chemistry May/June 2017
Examiner report found on page 17 / 55 pages total, pdf
Cambridge International General Certificate of Secondary Education 0620 Chemistry June 2017 Principal Examiner Report for Teachers (d) Most candidates gained at least partial credit and many candidates deduced the correct order of reactivity from the data provided. (e) (i) Many candidates disadvantaged themselves by referring to time rather than rate. Other candidates suggested that rate decreases as concentration increases. This may also reflect the misconception that rate is
(IGCSE) Chemistry Oct/Nov 2013
Examiner report found on page 17 / 50 pages total, pdf
Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2013 Principal Examiner Report for Teachers © 2013 (c) (i) A majority of the candidates gave the correct num ber of neutrons (18). The commonest errors were 16 or 17. (ii) Few candidates gave a suitable definition of ‘isoto pes’. The commonest errors were to refer to molecules rather than atoms, to
(IGCSE) Chemistry May/June 2017
Examiner report found on page 14 / 55 pages total, pdf
Cambridge International General Certificate of Secondary Education 0620 Chemistry June 2017 Principal Examiner Report for Teachers (iii) Most candidates identified the correct electronic structure. A few candidates chose D, focusing on the 4 outer electrons rather than the 4 shells. (iv) Most candidates identified the fluorine atom. C or D were the most common incorrect answers. (v) This was the least well answered part of the question
(IGCSE) Chemistry Oct/Nov 2018
Examiner report found on page 14 / 66 pages total, pdf
Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2018 Principal Examiner Report for Teachers Many candidates need more practice in questions involving qualitative tests. For example, very few candidates knew the test for potassium in Question 2(b) or the test for an unsaturated hydrocarbon in Question 4(a)(ii). Many candidates need more practice in answering questions involving extended answers such as Question 3(a)(ii
(IGCSE) Chemistry Feb/March 2019
Examiner report found on page 7 / 21 pages total, pdf
Cambridge International General Certificate of Secondary Education 0620 Chemistry March 2019 Principal Examiner Report for Teachers (e) A majority of the candidates calculated the relative formula mass correctly. A few did the calculations in the boxes correctly but did not add the value for the uranium or left the answer line blank. The commonest mathematical error was to suggest that 2 × 19 = 36 (for the fluorine).