(IGCSE) Chemistry Feb/March 2017 paper 3 variant 2
Question paper found on page 12 / 16 pages total, pdf
12 (f) 1000 g of a solution produced by the electrolysis of concentrated aqueous sodium chloride contains the following masses of compounds. compound mass of substance present / g sodium chlorate( I ) 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
(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
3 2 (a) The table shows the ions present in a 1000 cm 3 sample of mineral water. mass present in mg / 1000 cm 3 ion present formula of ion calcium Ca 2+ 52 chloride Cl – 10 hydrogencarbonate HCO 3 – 50 magnesium Mg 2+ sodium Na + 12 sulfate SO 42– 10 NO 3 – 8 total 150 Answer these questions using
(IGCSE) Chemistry May/June 2017 paper 3 variant 2
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 rainwater. mass present in mg / 1000 cm 3 ion present formula of ion calcium Ca 2+ 1 hydrogencarbonate HCO 3 – 3 magnesium Mg 2+ 1 potassium K + 2 sodium Na + 9 silicate SiO 3 2– 1 Cl – 17 Answer these questions using the information from the table.
(IGCSE) Chemistry May/June 2017 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 polluted river water. mass present in mg / 1000 cm 3 ion present formula of ion calcium Ca 2+ 2.0 chloride Cl – 1.3 hydrogencarbonate HCO 3– 2.0 magnesium Mg 2+ 1.0 potassium K + 4.0 silicate SiO 32– 12.0 sodium Na + 11.0
(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
0) M4 Mr Ca(OH)2 = 74 M5 M4 M3 = 74 0.02 = 1.48 (g / dm3) Question 3(a)(i) Answer atom(s) of the same element Marks 2 with different number of neutrons 3(a)(ii)551 3(a)(iii)24 protons; 28 neutrons; 21 electrons3 © UCLES 2022 Page 6 of 9
(IGCSE) Chemistry Feb/March 2021 paper 4 variant 2
Mark scheme found on page 7 / 10 pages total, pdf
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 at a given temperature (1) 4(e)solubility (of ZnCl2 / solids) decreases (as temperature
(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
0620/42 Cambridge IGCSE – Mark Scheme PUBLISHED Question Answer October/November 2018 Marks 3(d)(i) yellow 1 3(d)(ii) M1 0.2 × 25 / 1000 = 5(.00) × 10 –3 or 0.005(00) (mol) 4 M2 5(.00) × 10 –3 / 2 = 2.5(.0) × 10 –3 or
(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
5 3 This question is about sulfur, sulfur compounds and the water from a sulfur spring. A sulfur spring is a natural source of water containing sulfur. (a) The table shows the mass of ions present in a 1000 cm 3 sample of water from a sulfur spring. formula of ion mass present in the 1000 cm 3 sample / mg Br – 4 calcium Ca 2+ 44
(IGCSE) Chemistry Oct/Nov 2011 paper 6 variant 1
Question paper found on page 14 / 16 pages total, pdf
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
2 Question 1 Each candidate will require the following apparatus and chemicals. The labels of solution B and solution C must not include concentrations. (a) 1 × 25 cm 3 measuring cylinder (b) 1 × 50 cm 3 burette with stand and clamp (c) 1 × 250 cm 3 conical flask (d) 150 cm 3 of aqueous potassium manganate( VII ), KMnO 4 , of concentration
(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
2 0620/53/CI/O/N/13 © UCLES 2013 For Question 1 Each candidate will require (a) one 25 cm 3 or 50 cm 3 measuring cylinder (b) one burette, 50 cm 3 (c) one 250 cm 3 conical fl ask (d) 150 cm 3 of aqueous potassium manganate( VII ), KMnO 4 , of concentration 3.2 g / dm
(IGCSE) Chemistry Oct/Nov 2021 paper 4 variant 2
Mark scheme found on page 6 / 11 pages total, pdf
s) + 2HNO3(aq) → Zn(NO3)2(aq) + 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
(IGCSE) Chemistry May/June 2018 paper 3 variant 2
Question paper found on page 11 / 16 pages total, pdf
11 (b) Sodium hydroxide is manufactured by the electrolysis of sodium chloride. (i) After electrolysis, 1000 cm 3 of solution contains 750 g of sodium hydroxide. What mass of sodium hydroxide is present in 200 cm 3 of this solution? ......................................................
(IGCSE) Chemistry Oct/Nov 2007 paper 3
Question paper found on page 9 / 16 pages total, pdf
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 –1600 –1700 –1800 –1900 –2000 –210
(IGCSE) Chemistry May/June 2004
Mark scheme found on page 15 / 21 pages total, pdf
s Number of particles or formula mass in grams or 6 x 10 23 particles accept atoms, ions and molecules or as many particles as there are carbon atoms in 12.00g of 12 Ca ANY one [1] (b) (i) moles of Mg = 3/24 = 0.125 moles of CH 3 COOH = 12/60 = 0.200 magnesium is in excess OR
(IGCSE) Chemistry May/June 2007 paper 2
Question paper found on page 14 / 16 pages total, pdf
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 electricity when it is because
(IGCSE) Chemistry May/June 2022 paper 5 variant 1
Question paper found on page 7 / 12 pages total, pdf
7 3 A sample of muddy river water contains water, dissolved solids and insoluble solid mud. Plan an investigation to find the concentration of dissolved solids, in g / dm3, in the river water. In your answer state how you will work out the concentration of the dissolved solids in g / dm3. You are provided with a small sample (less than 1 dm3) of muddy river water and common
(IGCSE) Chemistry Feb/March 2017 paper 4 variant 2
Question paper found on page 10 / 16 pages total, pdf
10 (iv) The temperature inside the blast furnace in which zinc is extracted is about 1000 °C. The table gives some information about substances in the blast furnace in which zinc is extracted. substance carbon melting point / °C boiling point / °C sublimes at 4330 °C silicon( IV ) oxide 1610 2230 zinc 420 907 Use the data in the table
(IGCSE) Chemistry Feb/March 2022 paper 5 variant 2
Question paper found on page 7 / 12 pages total, pdf
7 3 izzy drinks contain carbon dioxide gas dissolved in a liquid. The carbon dioxide gas can be F removed from the fizzy drink by heating. lan an investigation to find the volume of carbon dioxide gas in 1 dm3 of a fizzy drink. P Include in your answer how you will calculate the volume of carbon dioxide gas dissolved in 1 dm3 of a fizzy drink. ou are provided with a
(IGCSE) Chemistry Oct/Nov 2016 paper 4 variant 1
Mark scheme found on page 6 / 7 pages total, pdf
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 (0.05 × 0.5) = 0.025 1 1 7(b) 0.0125 1 7(c) 0.55 M1 44 M2 0.55 1 1
(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
4 (e) (i) The table describes the ease of reduction of some metal oxides with carbon monoxide. lead oxide moderate heating to about 200 °C needed iron oxide high temperature furnace at 750 °C needed magnesium oxide temperatures above 1000 °C needed zinc oxide very high temperature furnace at 900 °C needed Put these metals in order of their reactivity with carbon monoxide. least reactive most
(IGCSE) Chemistry Oct/Nov 2013 paper 3 variant 3
Question paper found on page 8 / 12 pages total, pdf
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 reactive metal, takes so long to corrode. ..............
(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
s Number of particles The formula mass in grams A mole contains 6 x 10 23 particles A mole contains 6 x 10 23 atoms, ions or molecules A particular problem was that the definitions given were confined to atoms and not the full range of elementary entities or particles. (b)(i) moles of Mg = 3/24 = 0.125 moles of CH 3 COOH = 12/6
(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
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 sodium hydroxide produced by electrolysis contains the following masses of compounds. compound mass of compound kg/
(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
0620/43 Cambridge IGCSE – Mark Scheme PUBLISHED Question Answer May/June 2017 Marks 6(a)(i) BaCO 3 → BaO + CO 2 1 6(a)(ii) anything pH in the range pH 10 to pH 14 1 6(a)(iii) nitrogen dioxide 1 oxygen 1 6(b)(i) Na 2 CO 3 + Ba(NO 3 ) 2 → BaCO 3 + 2NaNO 3
(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
s Use The diagram shows a silvered light bulb. thin layer of silver alloy thin coil of tungsten wire brass lamp holder plastic copper wires Some properties of metals used in the light bulb are shown in the table below. hardness electrical conductivity melting point / °C hard good about 1000 7 000 copper fairly soft very good 1083 9 600 silver fairly soft very good 962 1
(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
0620/41Cambridge IGCSE – Mark Scheme PUBLISHED QuestionAnswer 4(c) 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
(IGCSE) Chemistry Oct/Nov 2016 paper 4 variant 2
Mark scheme found on page 4 / 7 pages total, pdf
Page 4 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2016 0620 42 © UCLES 2016 Question Answer Mark 4(a) copper( II ) carbonate fizzes / bubbles / effervescence dissolves / disappears copper( II ) oxide dissolves / disappears blue (solution formed) 2 2 4(b)(i) Cu(NO 3 ) 2 3Cu AND 3Cu(NO 3 ) 2 2 4(b)(ii)
(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
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 it is used to make fertilisers. (i) Give another use of sulphur dioxide. [1]
(IGCSE) Chemistry Feb/March 2018 paper 4 variant 2
Mark scheme found on page 6 / 8 pages total, pdf
0620/42 Cambridge IGCSE – Mark Scheme PUBLISHED Question 2(c)(iv) Answer M1 (moles of NaCl = 0.20 × 20 ÷ 1000 =) 4(.00) × 10 –3 or 0.004(00) March 2018 Marks 4 M2 (M r of NaNO 3 =) 85 M3 (85 × 4(.00) × 10 –3 =) 0
(IGCSE) Chemistry Oct/Nov 2015 paper 5 variant 3
Confidential instructions found on page 2 / 8 pages total, pdf
2 0620/53/CI/O/N/15 © UCLES 2015 For Question 1 Each candidate will require (a) a 25 cm 3 or 50 cm 3 measuring cylinder (b) a 50 cm 3 burette and stand (c) a 250 cm 3 conical flask (d) 75 cm 3 of aqueous potassium manganate( VII ), KMnO 4 , of concentration 4.0 g / dm
(IGCSE) Chemistry May/June 2006 paper 2
Question paper found on page 11 / 16 pages total, pdf
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
0620/42Cambridge IGCSE – Mark Scheme PUBLISHED QuestionAnswer February/March 2022 Marks 2(d)(iii)a new line steeper than printed line and starts at origin and levels off earlier than printed line levels off at the same volume2 2(e)M1 mol HCl = 0.400 × 25.0 / 1000 = 0.01(00) M2 mol CO2 = M1 / 2 =
(IGCSE) Chemistry Oct/Nov 2014 paper 2 variant 2
Mark scheme found on page 5 / 6 pages total, pdf
Page 5 Mark Scheme Syllabus Paper Cambridge IGCSE – October/November 2014 0620 22 © Cambridge International Examinations 2014 (c) (i) A [1] (ii) C [1] (iii) B [1] (iv) D [1] [Total: 11] 6 (a) (i) Any two from: [2] • have same functional group • group of similar compounds / have similar chemical properties
(IGCSE) Chemistry Oct/Nov 2016 paper 3 variant 2
Mark scheme found on page 3 / 9 pages total, pdf
s) are faster at higher temperatures / reactions with iron are faster at higher temperatures / reactions with metals are faster at higher temperatures OR decreases because less oxygen is dissolved at higher temperatures 1 2(f) filtration treatment with chlorine / chlorination 1 1 2(g)(i) any suitable source, e.g. car (exhausts) / lightning / furnaces / 1 2(g)(ii) breathing difficulties / irritation to nose
(IGCSE) Chemistry May/June 2016 paper 4 variant 2
Question paper found on page 9 / 12 pages total, pdf
9 0620/42/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
s in excess – bigger number of moles they had incorrectly assumed a 1:1 ratio The following was quite common: Number of moles of CaCO 3 = 0.3/100 = 0.003 Moles of HCl = 5/1000 x1 = 0.006 (from 2 x 0.003) Reagent in excess cannot answer Reason cannot answer (iii) While many correct answers were seen, some candidates
(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
...........................................................................................[2] For Examiner’s Use negative electrode (graphite) steel case – + aluminium oxide dissolved in molten cryolite positive electrode (graphite) molten aluminium collecting on the bottom
(IGCSE) Chemistry May/June 2014 paper 3 variant 1
Question paper found on page 4 / 16 pages total, pdf
4 3 (a) Different gases diffuse at different speeds. (i) What is meant by the term diffusion? ..............................................................................................................
(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
acid reacts with oxygen (to form sulfuric acid); 4(b)(ii) Paper 33 (oxides of nitrogen) react with water (making nitric acid); 3 A named oxide of nitrogen A correct formulae A NO x add sodium hydroxide (solution) and aluminium; (warm) and ammonia made; A zinc or Devarda’s 2 A description of smell of ammonia or test for ammonia © Cambridge International Examinations 2015
(IGCSE) Chemistry May/June 2016 paper 4 variant 2
Mark scheme found on page 8 / 9 pages total, pdf
Page 8 Mark Scheme Syllabus Paper Cambridge IGCSE – May/June 2016 0620 42 © Cambridge International Examinations 2016 Question Answer Marks 6(a)(i) roast / heat and in air / oxygen; 1 6(a)(ii) 2ZnS + 3O 2 → 2ZnO + 2SO 2 ; SO 2 on right of equation; all formulae and balancing correct; 2 6(b)(i) M1
(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
s results’. Materials and apparatus for Question 1 Each candidate will require the following materials and apparatus. The labels of solution A and solution B must not include concentrations. ● 150 cm 3 of aqueous potassium manganate( VII ), KMnO 4 , of concentration 3.2 g / dm 3 labelled solution A ● 150 cm 3 of aqueous potassium manganate( VII ), KMnO 4 , of concentration 1.
(IGCSE) Chemistry Feb/March 2017 paper 4 variant 2
Mark scheme found on page 4 / 6 pages total, pdf
0620 / 42 Cambridge IGCSE – Mark Scheme PUBLISHED Question Answer March 2017 Marks 4(a)(i) arrow labelled A on or near wire going in an anti-clockwise direction 1 4(a)(ii) arrow labelled B in electrolyte pointing towards the cathode 1 4(b)(i) electrons are lost 1 4(b)(ii) M1 Cu 2+ ions on left 1 M2 rest of equation correct
(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
S 2 [1] (ii) (one) more sulfur atom in A / B has 1 sulfur atoms but A has 2 [1] same number of C and H atoms / molecule otherwise the same / [1] (c) (i) 18 [1] (ii) atoms of same element with different number of neutrons / atoms with same number of protons and different numbers of neutrons / ato ms differing only
(IGCSE) Chemistry May/June 2010 paper 3 variant 3
Mark scheme found on page 5 / 6 pages total, pdf
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 not in correct order = [2] two out of three stated in any order = [1] (c) (i) silver chloride / silver bromide [1] photography / cameras
(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
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 not in correct order = [2] two out of three stated in any order = [1] (c) (i) silver chloride / silver bromide [1] photography / cameras
(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
s balanced the equation by adding CO 2 . The commonest incorrect answers were CO or O 2 . (iii) Some candidates calculated the minimum mass of calcium carbonate correctly (15 g). A considerable minority of candidates need more practi ce with this type of questions involving ratios. (b) (i) Very few candidates could explain that the ease of decomposition decreased down the Group. Most just referred to the
(IGCSE) Chemistry May/June 2017
Examiner report found on page 14 / 55 pages total, pdf
S” was the symbol for sodium. (iii) Many candidates calculated the mass of silicate ions correctly. Other candidates did not use simple proportions correctly. A common error was to divide 12 by 250 to get an incorrect answer of 0.048 g. Other candidates used the value for sodium (11 mg) to get an answer of 2.75 g. (iv) A minority of candidates were able
(IGCSE) Chemistry Oct/Nov 2018
Examiner report found on page 14 / 66 pages total, pdf
Some candidates identified the alcohol functional group in (d)(i). Fewer gave the correct formula for compound S in (d)(ii). (a) (i) Nearly all the candidates recognised that potassium was the positive ion with the lowest concentration. The most common incorrect answer was the sodium ion, the positive ion with the greatest concentration, an error arising from misreading the stem of the question © 2018
(IGCSE) Chemistry Feb/March 2019
Examiner report found on page 7 / 21 pages total, pdf
S on the left hand side of the equation. Another common error was to suggest 4SO 2 . (iii) Very few candidates gained full credit for this question. The best answers involved starting by adding the mixture of zinc and sulfur to the organic solvent, followed by the filtration of zinc from the solution with zinc being the residue. Many candidates either assumed that the solvent had been added already or that