(A/s) Chemistry Oct/Nov 2019 paper 4 variant 2
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PbO2(s)77 PbO(s)69 O2(g)205 Lead(IV) oxide, PbO2, decomposes to lead(II) oxide, PbO, and oxygen when heated. 2PbO2(s) 2PbO(s) + O2(g) ΔH o = +118 kJ mol–1 (a) Use the data to calculate the value of ΔS o for this reaction. ΔS o = ............
(A/s) Chemistry Oct/Nov 2019 paper 1 variant 2
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lead(II) sulfide, PbS, is heated in air, sulfur dioxide and lead(II) oxide are formed. What is the equation for the reaction between PbS and oxygen? APbS + 2O2 → SO2 + PbO2 BPbS + 2 21 O2 → SO3 + PbO2 CPbS + 1 21 O2 → SO2 + PbO DPbS + 2O2 → SO3 + PbO © UCLES 2019 97
(A/s) Chemistry Oct/Nov 2012 paper 5 variant 2
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lead, PbO, PbO 2 and Pb 3 O 4 , all of which can be reduced to metallic lead by hydrogen. The following information gives some of the hazards associated with these compounds. Lead oxides Lead( II ) oxide (PbO) Lead( IV ) oxide (PbO 2 ) Dilead( II ) lead( IV ) oxide (Pb 3 O 4 ) Toxic Dangerous for the environment Harmful by inhalation and if
(A/s) Chemistry Oct/Nov 2012 paper 5 variant 1
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lead, PbO, PbO 2 and Pb 3 O 4 , all of which can be reduced to metallic lead by hydrogen. The following information gives some of the hazards associated with these compounds. Lead oxides Lead( II ) oxide (PbO) Lead( IV ) oxide (PbO 2 ) Dilead( II ) lead( IV ) oxide (Pb 3 O 4 ) Toxic Dangerous for the environment Harmful by inhalation and if
(IGCSE) Chemistry Oct/Nov 2021 paper 4 variant 3
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lead by mass in PbS. percentage of lead by mass in PbS = .............................. [1] (c) The percentage of lead by mass in PbCO3 is 77.5%. Use this information and your answer to (b) to suggest whether it would be better to extract lead from PbCO3 or PbS. Give a reason for your
(A/s) Chemistry Oct/Nov 2012 paper 5 variant 1
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to burn hydrogen OR lead/lead oxide is harmful/toxic, so wear a mask/use a fume cupboard to prevent inhalation of hydrogen/lead/lead oxide OR acids are corrosive/irritant, use chemically resistant gloves OR reduction tube is hot, allow to cool before handling/use heat resistant gloves/tongs. [1] (g) PLAN Method Columns are: mass/weight of the oxide; mass/weight of lead; mass/weight of oxygen;
(A/s) Chemistry Oct/Nov 2012 paper 5 variant 2
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to burn hydrogen OR lead/lead oxide is harmful/toxic, so wear a mask/use a fume cupboard to prevent inhalation of hydrogen/lead/lead oxide OR acids are corrosive/irritant, use chemically resistant gloves OR reduction tube is hot, allow to cool before handling/use heat resistant gloves/tongs. [1] (g) PLAN Method Columns are: mass/weight of the oxide; mass/weight of lead; mass/weight of oxygen;
(IGCSE) Co-ordinated Sciences May/June 2013 paper 3 variant 2
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to extract lead from lead oxide, PbO. lead oxide For Examiner's Use U-tube excess hydrogen being burnt hydrogen gas heat water condensing inside U-tube cold water Fig. 1.3 (i) Construct a balanced symbolic equation for the reaction between hydrogen and lead oxide. [2] (ii) Suggest why the method shown in Fig. 1.3 could not be used to extract calcium from calcium oxide. [2]
(A/s) Chemistry May/June 2007 paper 4
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Lead forms three oxides: yellow PbO, black PbO 2 and red Pb 3 O 4 . (a) Carbon monoxide burns readily in air. Heating black lead oxide produces oxygen gas, leaving a yellow residue. (i) Suggest a balanced equation for each reaction. ........................................................
(IGCSE) Co-ordinated Sciences Oct/Nov 2014 paper 3 variant 2
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Lead metal can be extracted from lead oxide, PbO, by heating a mixture of lead oxide powder and graphite powder. Fig. 5.1 shows laboratory apparatus that can be used for this reaction. mixture of lead oxide and graphite powder limewater heat Fig. 5.1 During the reaction, lead oxide is reduced and a gas is given off that reacts with limewater turning it cloudy. (i) Use the information above
(A/s) Chemistry Oct/Nov 2010 paper 4 variant 2
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lead’ is used as a pigment, and as a metal primer paint to prevent the corrosion of steel. It is an oxide of lead that contains 9.30% oxygen by mass. Calculate to 3 significant figures the number of moles of oxygen and lead contained in a 100.0 g sample of red lead. Hence calculate its empirical formula. empirical formula: .................
(A/s) Chemistry Oct/Nov 2010 paper 4 variant 1
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lead’ is used as a pigment, and as a metal primer paint to prevent the corrosion of steel. It is an oxide of lead that contains 9.30% oxygen by mass. Calculate to 3 significant figures the number of moles of oxygen and lead contained in a 100.0 g sample of red lead. Hence calculate its empirical formula. empirical formula: .................
(IGCSE) Co-ordinated Sciences Oct/Nov 2010 paper 3 variant 2
Question paper found on page 4 / 28 pages total, pdf
to investigate the reaction between lead oxide, PbO, and carbon. glass rod drop of limewater mixture of lead oxide and powdered carbon strong heat Fig. 1.3 When the mixture is heated, a redox reaction occurs in which lead oxide is reduced. The drop of limewater suspended on the glass rod turns cloudy. (i) Name the gas which is produced in this redox reaction. [1] (ii) Suggest the
(IGCSE) Co-ordinated Sciences Oct/Nov 2014 paper 2 variant 2
Question paper found on page 10 / 32 pages total, pdf
to produce chlorine. ..................... [2] (b) Lead metal can be extracted from lead oxide, PbO, by heating a mixture of lead oxide powder and carbon powder. Fig. 5.1 shows laboratory apparatus that can be used for this reaction. carbon dioxide gas mixture of lead oxide and carbon powder test-tube heat Fig. 5.1 During the reaction, lead
(A/s) Chemistry Oct/Nov 2008 paper 1
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oxide 7 Which of the following would behave most like an ideal gas at room temperature? A carbon dioxide B helium C hydrogen D nitrogen 8 Red lead oxide, Pb 3 O 4 , is used in metal priming paints. It can be made by heating PbO in air. 6PbO(s) + O 2 (g) → 2Pb 3 O 4 (s) Which two values are needed to calculate the enthalpy
(A/s) Chemistry Oct/Nov 2012 paper 5 variant 1
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oxide of lead, (ii) stating how you would ensure that the decomposition is complete, (iii) showing by calculation the minimum volume of hydrogen, measured at 25 ° C, that would be needed to reduce the mass of oxide of lead stated in (i) above. For calculation purposes, you may assume that the oxide of lead is PbO, (iv) stating how you would use your results to reach
(A/s) Chemistry Oct/Nov 2011 paper 5 variant 3
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lead, PbO, PbO 2 and Pb 3 O 4 all of which can be reduced to metallic lead by hydrogen. A sample of one of these oxides is reduced to find out which of the three oxides it is. An experiment was carried out as follows. • An empty reduction tube was weighed and the mass recorded. • A sample of the lead oxide was added to the reduction tube and the
(A/s) Chemistry Oct/Nov 2012 paper 5 variant 2
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oxide of lead, (ii) stating how you would ensure that the decomposition is complete, (iii) showing by calculation the minimum volume of hydrogen, measured at 25 ° C, that would be needed to reduce the mass of oxide of lead stated in (i) above. For calculation purposes, you may assume that the oxide of lead is PbO, (iv) stating how you would use your results to reach
(IGCSE) Chemistry Oct/Nov 2017 paper 3 variant 3
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lead( II ) sulfide. (a) The ore is first heated in air. Balance the chemical equation for this reaction. 2PbS + ......O 2 2PbO + ......SO 2 [2] (b) The lead( II ) oxide produced is then reduced with carbon. PbO + C Pb + CO (i) How does this equation show that the lead( II ) oxide is reduced?
(IGCSE) Chemistry Oct/Nov 2012 paper 2 variant 3
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Lead nitrate solution reacts with sodium iodide solution. lead nitrate + sodium iodide → lead iodide + sodium nitrate Lead iodide is insoluble in water but the reactants and sodium nitrate are soluble. Draw a labelled diagram to explain how you can separate lead iodide from the rest of the reaction mixture. [2] (d) Complete the table below to show the number of protons, electrons and neutrons in the isotope of
(A/s) Chemistry May/June 2017 paper 5 variant 2
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lead oxide(s) 1 Mass of lead combined with 1 g of oxygen 1 1(e)(i) PbO 2 1 1(e)(ii) Relative formula mass or relative molecular mass / M r 1 1(f) To prevent oxidation or re-oxidation (of lead) 1 1(g) Re-heat the lead (oxide) and re-weigh until there is no further loss in mass. 1 1(d) Total: ©
(IGCSE) Chemistry May/June 2013 paper 3 variant 3
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to represent an electron from a chlorine atom. Use x to represent an electron from a germanium atom. [2] (c) Describe the structure of the giant covalent compound germanium( IV ) oxide, GeO 2 . It has a similar structure to that of silicon( IV ) oxide. ..............................................
(IGCSE) Chemistry May/June 2012 paper 1 variant 2
Question paper found on page 4 / 16 pages total, pdf
g) → CO 2 (g) + 2H 2 O(g) 10 In which reaction is lead( II ) oxide, PbO, oxidised? A PbO + C → Pb + CO B PbO + CO → Pb + CO 2 C PbO + H 2 → Pb + H 2 O D 2PbO + O 2 → 2PbO 2 © UCLES 2012 0620/12/M/J/12
(A/s) Chemistry May/June 2021 paper 4 variant 2
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Lead(II) nitrate, Pb(NO3)2, decomposes on heating in a similar manner to the Group 2 nitrates. Write an equation for the decomposition of lead(II) nitrate. .......................................................................................
(IGCSE) Chemistry May/June 2010 paper 2 variant 2
Question paper found on page 9 / 16 pages total, pdf
lead has the mass number 208. Complete the table to show the number of subatomic particles in an atom of this isotope of lead. Use the Periodic Table to help you. type of particle number of particles electrons protons neutrons [3] (d) When lead is heated in oxygen, lead( II ) oxide is formed. Write a word equation for this reation. ...............
(IGCSE) Chemistry May/June 2013 paper 2 variant 2
Question paper found on page 8 / 16 pages total, pdf
lead involves reducing lead( II ) oxide with carbon. PbO + C → Pb + CO How does this equation show that lead oxide gets reduced? ...............................................................................................
(IGCSE) Chemistry May/June 2010 paper 2 variant 3
Question paper found on page 9 / 16 pages total, pdf
lead has the mass number 208. Complete the table to show the number of subatomic particles in an atom of this isotope of lead. Use the Periodic Table to help you. type of particle number of particles electrons protons neutrons [3] (d) When lead is heated in oxygen, lead( II ) oxide is formed. Write a word equation for this reation. ...............
(IGCSE) Chemistry May/June 2004 paper 1
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oxide Pb 3 O 4 reacts with dilute nitric acid to form lead( II ) nitrate, lead( IV ) oxide and another product. What is the equation for this reaction? A Pb 3 O 4 + 4HNO 3 → 2Pb(NO 3 ) 2 + PbO 2 + 2H 2 O B Pb 3 O 4 + 2HNO 3 → 2PbNO 3 + PbO 4 + H 2 C Pb
(IGCSE) Chemistry Oct/Nov 2016 paper 4 variant 3
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relights / rekindles 1 1 3(d)(i) more than enough to react (with all the acid) OR some lead oxide remains after the reaction OR (nitric) acid is limiting 1 3(d)(ii) solid stops dissolving 1 3(d)(iii) PbO + 2HNO 3 → Pb(NO 3 ) 2 + H 2 O OR PbO + 2H + → Pb 2+ + H 2 O 1
(A/s) Chemistry Oct/Nov 2009 paper 4 variant 1
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Lead( II ) oxide reacts with both acids and bases. (i) What is the name given to oxides that have this property? .....................................................................................................
(IGCSE) Chemistry May/June 2014 paper 6 variant 2
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Pb and metal oxide (1) allow: heat to melt lead and run off / decant [4] OR heat (1) with carbon / CO (1) PbO (1) heat with carbon / CO (1) [4] OR heat (1) with iron (1) PbO (1) separation (1) [4] OR dilute acid (1) allow: any dilute acid ignore: heating © Cambridge International Examinations 2014
(A/s) Chemistry May/June 2015 paper 4 variant 2
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to be written with 2 d.p. to get the last mark. (b) (i) Tin( II ) oxide is more basic than tin( IV ) oxide [1] or tin( II ) oxide is less acidic than tin ( IV ) oxide (ii) e.g. SnO + 2HC l → SnC l 2 + H2O( or ionic or with H 2 SO 4 ) [2]
(A/s) Chemistry Oct/Nov 2013 paper 5 variant 3
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oxide and lead( IV ) oxide, will catalyse the decomposition. The following information gives some of the hazards associated with manganese( IV ) oxide and lead( IV ) oxide. Manganese( IV ) oxide: Poisoning can occur by inhalation or swallowing the powder. Lead( IV ) oxide: Poisoning can occur by inhalation or swallowing the powder. The powder can also cause skin irritation. You are provided with a 0.3
(IGCSE) Chemistry Oct/Nov 2021 paper 4 variant 3
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lead is larger in PbS or answer to (b) > 77.5%1 3(d)PbCO3 → PbO + CO21 3(e)PbCO3 + 2HNO3 → Pb(NO3)2 + H2O + CO22 3(f)(i)M1 two double bonds (1)2 M2 two pairs of non-bonding electrons on each oxygen and no non-bonding electrons on carbon (1) 3(f)(ii) M1
(A/s) Chemistry May/June 2012 paper 1 variant 2
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lead oxide, Pb 3 O 4 , is used in metal priming paints. It can be made by heating PbO in air. 6PbO(s) + O 2 (g) → 2Pb 3 O 4 (s) Which two values are needed to calculate the enthalpy change for this reaction? A enthalpy change of atomisation of O 2 and enthalpy change of formation of Pb 3 O 4 B enthalpy change of formation
(IGCSE) Chemistry Oct/Nov 2013 paper 3 variant 1
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lead( II ) carbonate has a formula of the type xPbCO 3 .yPb(OH) 2 where x and y are whole numbers. Determine x and y from the following information. PbCO 3 PbO + CO 2 Pb(OH) 2 PbO + H 2 O When heated, the basic lead( II ) carbonate gave 2.112 g of carbon dioxide and 0.432 g of water. Mass
(A/s) Chemistry May/June 2003 paper 4
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oxide in Group IV, PbO 2 , reacts with concentrated hydrochloric acid liberating chlorine gas. Use the Data Booklet to calculate the E o _ _ cell and to write a balanced equation for this reaction. ...........................................................................
(A/s) Chemistry Oct/Nov 2017 paper 4 variant 3
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lead-acid cells. Each cell consists of a negative electrode made of Pb metal and a positive electrode made of PbO 2 . The electrolyte is H 2 SO 4 (aq). When a lead-acid cell is in use, Pb 2+ ions are precipitated out as PbSO 4 (s) at the negative electrode. Pb(s) + SO 42– (aq) PbSO 4 (s) + 2e – (i)
(A/s) Chemistry Oct/Nov 2017 paper 4 variant 1
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lead-acid cells. Each cell consists of a negative electrode made of Pb metal and a positive electrode made of PbO 2 . The electrolyte is H 2 SO 4 (aq). When a lead-acid cell is in use, Pb 2+ ions are precipitated out as PbSO 4 (s) at the negative electrode. Pb(s) + SO 42– (aq) PbSO 4 (s) + 2e – (i)
(A/s) Chemistry Feb/March 2017 paper 4 variant 2
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to form a high melting point oxide. ● Suggest the formula of the oxide. ................................................................................. ● Suggest, in terms of structure, why the oxide has a high melting point whereas the chloride has
(IGCSE) Chemistry May/June 2017 paper 4 variant 3
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oxide is added to water. ........................................................................................................................................ [1
(IGCSE) Chemistry Feb/March 2020 paper 4 variant 2
Question paper found on page 5 / 12 pages total, pdf
oxide reacts with acids and with alkalis. (i) What term is used to describe an oxide that reacts with acids and with alkalis? ....................................................................................................
(IGCSE) Chemistry Oct/Nov 2021 paper 5 variant 1
Question paper found on page 7 / 12 pages total, pdf
decomposes slowly to form water and oxygen. 2H2O2(aq) → 2H2O(l) + O2(g) Copper(II) oxide is an insoluble solid. lan an investigation to find out if copper(II) oxide is a catalyst for the decomposition of P hydrogen peroxide. You must include how your results will tell you if copper(II) oxide is a catalyst. You have access to copper(II) oxide,
(IGCSE) Chemistry Oct/Nov 2021 paper 5 variant 3
Question paper found on page 7 / 12 pages total, pdf
decomposes slowly to form water and oxygen. 2H2O2(aq) → 2H2O(l) + O2(g) Copper(II) oxide is an insoluble solid. lan an investigation to find out if copper(II) oxide is a catalyst for the decomposition of P hydrogen peroxide. You must include how your results will tell you if copper(II) oxide is a catalyst. You have access to copper(II) oxide,
(IGCSE) Chemistry May/June 2005 paper 6
Question paper found on page 11 / 12 pages total, pdf
Examiner's Use 8 An aqueous solution of hydrogen peroxide decomposes very slowly to form oxygen. The speed of decomposition can be increased by using a catalyst. Two possible catalysts are the solids copper( II ) oxide and chromium( III ) oxide. Plan an investigation to find out which of these two oxides is the better catalyst for this decomposition. The space below can be used for a diagram. [6]
(A/s) Chemistry May/June 2019 paper 2 variant 1
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to form a black solid oxide. The oxidation state of X in this oxide is +2. The carbonate of X, XCO3, is a green solid. It decomposes on heating to form the oxide and a colourless gas. (i) From the information given, state two similarities and one difference that metal X and its compounds have with Group 2 metals and their compounds. similarity 1 ..........
(IGCSE) Co-ordinated Sciences Oct/Nov 2019 paper 3 variant 1
Question paper found on page 5 / 32 pages total, pdf
decomposes very slowly, releasing oxygen gas. A student adds solid manganese( IV ) oxide to aqueous hydrogen peroxide and observes that oxygen gas is released at a much higher rate. aqueous hydrogen peroxide oxygen gas aqueous hydrogen peroxide and manganese(IV) oxide Fig. 2.1 (i) Describe the test for oxygen gas. .....................................
(A/s) Chemistry May/June 2021 paper 5 variant 1
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oxide catalyst. A student is asked to investigate which metal oxide catalyst is best at increasing the initial rate of this reaction by using a method which involves the collection of oxygen. The student is provided with the following metal oxides: copper(II) oxide, iron(III) oxide, manganese(IV) oxide, nickel(II) oxide and titanium(IV) oxide. The student is also provided with an excess volume, of a known
(IGCSE) Chemistry Oct/Nov 2011 paper 2 variant 2
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decomposes slowly at room temperature to form water and oxygen. The reaction is catalysed by manganese( IV ) oxide. 2H 2 O 2 → 2H 2 O + O 2 A student used the apparatus shown below to study how changing the concentration of hydrogen peroxide affects the speed of this reaction. hydrogen peroxide manganese( IV ) oxide gas syringe oxygen collects here (a) Apart from the volume of hydrogen peroxide
(A/s) Chemistry May/June 2021 paper 5 variant 3
Question paper found on page 2 / 8 pages total, pdf
oxide catalyst. A student is asked to investigate which metal oxide catalyst is best at increasing the initial rate of this reaction by using a method which involves the collection of oxygen. The student is provided with the following metal oxides: copper(II) oxide, iron(III) oxide, manganese(IV) oxide, nickel(II) oxide and titanium(IV) oxide. The student is also provided with an excess volume, of a known
(IGCSE) Chemistry Oct/Nov 2011 paper 2 variant 3
Question paper found on page 6 / 20 pages total, pdf
decomposes slowly at room temperature to form water and oxygen. The reaction is catalysed by manganese( IV ) oxide. 2H 2 O 2 → 2H 2 O + O 2 A student used the apparatus shown below to study how changing the concentration of hydrogen peroxide affects the speed of this reaction. hydrogen peroxide manganese( IV ) oxide gas syringe oxygen collects here (a) Apart from the volume of hydrogen peroxide
(IGCSE) Co-ordinated Sciences Oct/Nov 2002 paper 1
Question paper found on page 10 / 20 pages total, pdf
used to extract lead from lead(II) oxide. mixture of carbon powder and lead(II) oxide heat limewater turns milky Which line in the table is correct? substance that is reduced substance that is oxidised gas given off A carbon lead(II) oxide carbon dioxide B carbon lead(II) oxide oxygen C lead(II) oxide carbon carbon dioxide D lead(II) oxide carbon oxygen 0654/1/O/N/02
(A/s) Chemistry May/June 2022 paper 4 variant 1
Question paper found on page 5 / 24 pages total, pdf
oxide, Mn2O7, can be made by treatment of KMnO4 with concentrated sulfuric acid (reaction 1). Mn2O7 readily decomposes at room temperature to form manganese(IV) oxide and a colourless diatomic gas (reaction 2). Construct equations for both the reactions described. reaction 1 .................................................
(IGCSE) Co-ordinated Sciences May/June 2011 paper 3 variant 1
Question paper found on page 19 / 24 pages total, pdf
decomposes. [1] (d) When excess dilute hydrochloric acid, HCl, is added to a mixture of calcium oxide and magnesium oxide, a highly exothermic neutralisation reaction occurs. (i) Name two salts which are present in the mixture after the reaction. 1 2 [1] (ii) Suggest the balanced symbolic equation for the reaction between magnesium oxide and dilute hydrochloric acid. [3] © UCLES 2011 0654
(IGCSE) Chemistry Oct/Nov 2012
Examiner report found on page 23 / 53 pages total, pdf
lead oxide was reduced by carbon. Others gave statements which were too vague to be given credit. For example: ‘PbO is reduced from PbO to Pb’ or ‘because it goes from a compound to an element’. (iii) A majority of the candidates explained that heat is absorbed in an endothermic reaction. Common errors included ‘loses heat’, ‘lead has a high boiling point’, or made reference to bonds
(A/s) Chemistry May/June 2022 paper 4 variant 3
Question paper found on page 5 / 24 pages total, pdf
oxide, Mn2O7, can be made by treatment of KMnO4 with concentrated sulfuric acid (reaction 1). Mn2O7 readily decomposes at room temperature to form manganese(IV) oxide and a colourless diatomic gas (reaction 2). Construct equations for both the reactions described. reaction 1 .................................................
(IGCSE) Co-ordinated Sciences May/June 2017 paper 6 variant 2
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decomposes (to copper oxide) ; 1 5(b)(ii) evaporate some of the water / leave to evaporate / heat / evaporate ; leave to crystallise / cool ; filter ; leave to dry / press between filter paper ; max 3 5(c) add barium nitrate / barium chloride AND white ppt. ; 1 5(d) zinc oxide ; hydrochloric acid ; 2 © UCLES 2017 Page 6 of
(IGCSE) Chemistry Oct/Nov 2006 paper 3
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oxide was formed. What mass of calcium carbonate was heated? [2] (c) Calcium carbonate is used to control soil acidity. (i) Why is it important to control soil acidity? [1] (ii) Both calcium carbonate, insoluble in water, and calcium oxide, slightly soluble, are used to increase soil pH. Suggest two advantages of using calcium carbonate. [2] (iii) Give one use of calcium carbonate
(A/s) Chemistry May/June 2014 paper 5 variant 3
Question paper found on page 2 / 12 pages total, pdf
decomposes to form magnesium oxide, nitrogen( IV ) oxide and oxygen. Nitrogen( IV ) oxide is an acidic gas that reacts readily and completely with alkalis. You are to plan a single experiment to con fi rm that the molar quantities of magnesium oxide, nitrogen( IV ) oxide and oxygen produced agree with the equation for the thermal decomposition of magnesium nitrate( V ). The following information gives some of the
(A/s) Chemistry May/June 2014 paper 5 variant 1
Question paper found on page 2 / 12 pages total, pdf
decomposes to form magnesium oxide, nitrogen( IV ) oxide and oxygen. Nitrogen( IV ) oxide is an acidic gas that reacts readily and completely with alkalis. You are to plan a single experiment to con fi rm that the molar quantities of magnesium oxide, nitrogen( IV ) oxide and oxygen produced agree with the equation for the thermal decomposition of magnesium nitrate( V ). The following information gives some of the
(A/s) Chemistry Feb/March 2019 paper 1 variant 2
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oxide of the element to H2O(l)result of adding the chloride of the element to H2O(l)result of adding the oxide of the element to HCl (aq) Xno reactionhydrolysesforms chloride salt Yforms hydroxidedissolvesforms chloride salt Zforms acidhydrolyseshydrolyses Which statement could be correct? AX is Al and Y is Mg. BX is Si and Y is Na. CY is Al and Z is P. DY is Na and Z
(IGCSE) Chemistry Oct/Nov 2016 paper 4 variant 3
Question paper found on page 5 / 12 pages total, pdf
Lead( II ) oxide is insoluble. A student adds solid lead( II ) oxide to dilute nitric acid until the lead( II ) oxide is in excess. Aqueous lead( II ) nitrate and water are produced. (i) What is meant by the term excess? . ..................................................
(IGCSE) Co-ordinated Sciences May/June 2019 paper 4 variant 3
Question paper found on page 27 / 32 pages total, pdf
to describe how acidic impurities are removed in the blast furnace. Each word or phrase may be used once, more than once or not at all. air calcium carbonate carbon dioxide iron calcium oxide silicon dioxide carbon slag Calcium carbonate decomposes to ............................................................ and
(IGCSE) Chemistry May/June 2020 paper 2 variant 1
Question paper found on page 11 / 16 pages total, pdf
oxide. What are the reasons for blowing in oxygen and adding calcium oxide? blowing in oxygenadding calcium oxide Acarbon is removed by reacting with oxygenreacts with acidic impurities making slag Bcarbon is removed by reacting with oxygenreacts with slag and so removes it Ciron reacts with the oxygenreacts with acidic impurities making slag Diron reacts with the oxygenreacts with slag and so removes it 28 Element Y reacts with copper(II) oxide to
(IGCSE) Chemistry May/June 2014 paper 3 variant 1
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decomposes to form water and oxygen. This reaction is catalysed by manganese( IV ) oxide. 2H 2 O 2 (aq) → 2H 2 O(l) + O 2 (g) The rate of this reaction can be investigated using the following apparatus. oxygen gas aqueous hydrogen peroxide and manganese( IV ) oxide 40 cm 3 of aqueous hydrogen peroxide was put in the fl ask and 0.1 g of
(IGCSE) Chemistry Oct/Nov 2018 paper 3 variant 1
Question paper found on page 13 / 16 pages total, pdf
oxide. Calcium carbonate added to the blast furnace decomposes to form calcium oxide and carbon .............................. . The calcium oxide reacts with the silicon( IV ) oxide to form .............................. . [3] © UCLES 2018 [Total: 8] 0620/31/
(IGCSE) Chemistry May/June 2012 paper 6 variant 3
Question paper found on page 4 / 12 pages total, pdf
decomposes to form oxygen. Manganese( IV ) oxide is a catalyst for this reaction. Two students investigated the speed of reaction using the apparatus below. 2 g of manganese( IV ) oxide powder was added to 50 cm 3 of aqueous hydrogen peroxide at 20 °C. aqueous hydrogen peroxide gas syringe manganese( IV ) oxide The volume of oxygen released was measured every 20 seconds. (a) Use the
(IGCSE) Chemistry Oct/Nov 2018 paper 3 variant 3
Question paper found on page 15 / 20 pages total, pdf
to form carbon dioxide. This reacts with further hot coke to form carbon .............................. . This gas reduces the iron( III ) oxide in the iron ore to iron. The limestone .............................. to form lime (calcium oxide) which reacts with impurities in the iron
(IGCSE) Chemistry May/June 2015 paper 3 variant 2
Question paper found on page 7 / 12 pages total, pdf
to which a nitrate decomposes is determined by the metal in the salt. (i) Sodium nitrate decomposes to form sodium nitrite, NaNO 2 . Write the equation for decomposition of sodium nitrate. .................................................................................
(A/s) Chemistry May/June 2017 paper 5 variant 2
Question paper found on page 3 / 16 pages total, pdf
to lead. ● The boats were allowed to cool completely with the methane gas still passing over them before they were re-weighed. ● The results are shown in the table. lead oxide mass of porcelain boat / g mass of boat + lead oxide / g mass of boat + lead after heating / g A 5.26 9.31 9.04 B 5.12 8.96 8.48 C
(IGCSE) Chemistry May/June 2019 paper 1 variant 1
Question paper found on page 5 / 16 pages total, pdf
to each one. Different metal oxides are added to four of the test-tubes and the height of the foam formed after 1 minute is measured. The results are shown. metal oxide height of foam / cm no metal oxide added 0.1 aluminium oxide 0.1 calcium oxide 0.2 copper( II ) oxide 2.3 manganese( IV ) oxide 5.4 Which conclusion can be drawn from these results? A
(A/s) Chemistry Oct/Nov 2012
Examiner report found on page 48 / 53 pages total, pdf
lead with oxygen. Even those who correctly gave the numbers of atoms in PbO and PbO 2 struggled with Pb 3 O 4 . (b) Most candidates gained at least partial credit here. It was often necessary to allow errors carried forward from (a) . The axes were specified as ‘moles of oxygen’ and ‘moles of lead’ but a common error was to label the latter as ‘moles of lead
(IGCSE) Chemistry Oct/Nov 2019 paper 6 variant 3
Question paper found on page 2 / 8 pages total, pdf
oxide speeds up this decomposition. Manganese( IV ) oxide is an insoluble solid. The apparatus shown was used to follow the rate of decomposition of hydrogen peroxide. The hydrogen peroxide was added to the conical flask and a stop‑watch was started. hydrogen peroxide water 0.5 g manganese( IV ) oxide (a) Complete the box to name the apparatus. [1] (b) What measurements should be taken to follow
(IGCSE) Chemistry Feb/March 2017 paper 4 variant 2
Question paper found on page 9 / 16 pages total, pdf
to the blast furnace decomposes to form calcium oxide. Calcium oxide removes silicon( IV ) oxide impurities from the iron in a neutralisation reaction. Write a chemical equation for the reaction of calcium oxide with silicon( IV ) oxide. Suggest why it is a neutralisation reaction. ....................................................
(IGCSE) Chemistry Oct/Nov 2002 paper 3
Question paper found on page 4 / 12 pages total, pdf
decomposes to form water and oxygen. 2H 2 O 2 (aq) → 2H 2 O(l) + O 2 (g) This reaction is catalysed by manganese( IV ) oxide The following experiments were carried out to investigate the rate of this reaction. A 0.1 g sample of manganese( IV ) oxide was added to 20 cm 3 of 0.2 M hydrogen peroxide solution. The volume of oxygen
(IGCSE) Chemistry May/June 2003
Examiner report found on page 12 / 16 pages total, pdf
were needed: catalytic converter react with carbon monoxide or hydrocarbons form nitrogen. (d) The quality of the descriptions of this salt preparation was poor. Many thought that lead oxide was soluble and the method was titration with an indicator. Others thought that lead nitrate was insoluble and that it would be precipitated. Few mentioned the need to add an excess of lead oxide and then filter to remove the unreacted solid.
(A/s) Chemistry Oct/Nov 2018 paper 4 variant 3
Question paper found on page 7 / 20 pages total, pdf
to show the total number of unpaired electrons in the 3d and 4s orbitals of each isolated gaseous atom. number of unpaired electrons 3d 4s Cr Mn Fe [2] (b) Solid potassium manganate( VII ), KMnO 4 , decomposes on heating manganese( IV ) oxide, potassium manganate( VI ) and a colourless gas. to form Construct an equation for this reaction. ............
(IGCSE) Chemistry May/June 2010 paper 3 variant 3
Question paper found on page 10 / 16 pages total, pdf
oxide dissolved in cryolite. The aluminium oxide decomposes. 2A l 2 O 3 → 4A l + 3O 2 Both electrodes are made of carbon. (i) Give two reasons why the oxide is dissolved in cryolite. .....................................................................
(IGCSE) Chemistry May/June 2010 paper 3 variant 2
Question paper found on page 10 / 16 pages total, pdf
oxide dissolved in cryolite. The aluminium oxide decomposes. 2A l 2 O 3 → 4A l + 3O 2 Both electrodes are made of carbon. (i) Give two reasons why the oxide is dissolved in cryolite. .....................................................................
(IGCSE) Chemistry Oct/Nov 2014 paper 6 variant 1
Question paper found on page 2 / 12 pages total, pdf
lead( II ) oxide to prepare lead( II ) nitrate. The diagram shows the stages in the method used. DILUTE NITRIC ACID 150 cm 3 of dilute nitric acid was measured into a beaker 2 Lead( II ) oxide was added until all the nitric acid had reacted 3 The mixture was separated 4 The solution was allowed to cool heat solution of lead( II ) nitrate (a) Complete the
(IGCSE) Co-ordinated Sciences Oct/Nov 2017 paper 3 variant 2
Question paper found on page 26 / 32 pages total, pdf
oxide, CoO copper oxide, CuO silicon dioxide, SiO 2 (i) One of these compounds undergoes thermal decomposition in the kiln. State which compound decomposes and name one of the products of the decomposition. compound ...........................................................................
(A/s) Chemistry Oct/Nov 2017 paper 2 variant 2
Question paper found on page 7 / 12 pages total, pdf
to dryness. The anhydrous solid is then heated strongly and decomposes. Barium oxide is produced, together with two other products. Identify the two other products of this decomposition reaction and state what would be observed. ...........................................................................
(A/s) Chemistry Oct/Nov 2012
Examiner report found on page 45 / 53 pages total, pdf
lead with oxygen. Even those who correctly gave the numbers of atoms in PbO and PbO 2 struggled with Pb 3 O 4 . (b) Most candidates gained at least partial credit here. It was often necessary to allow errors carried forward from (a) . The axes were specified as ‘moles of oxygen’ and ‘moles of lead’ but a common error was to label the latter as ‘moles of lead
(IGCSE) Chemistry Oct/Nov 2019 paper 2 variant 3
Question paper found on page 4 / 16 pages total, pdf
decomposes on heating to form magnesium oxide and carbon dioxide as shown. MgCO3 → MgO + CO2 How much magnesium carbonate is needed to make 5.0 g of magnesium oxide? A 3.5 g B 4.0 g C 6.5 g D 10.5 g 10 90 g of glucose is dissolved in water. The glucose solution is fermented. C6H12O6 → 2CO2 + 2C2
(IGCSE) Chemistry Oct/Nov 2014 paper 3 variant 3
Question paper found on page 6 / 12 pages total, pdf
decomposes to form sodium chloride and oxygen. The rate of this reaction is very slow at room temperature provided the sodium chlorate( I ) is stored in a dark bottle to prevent exposure to light. 2NaC l O → 2NaC l + O 2 The rate of this decomposition can be studied using the following experiment. sodium chlorate( I ) solution oxygen collects in syringe 20 40 60 80 1
(IGCSE) Chemistry May/June 2010 paper 1 variant 1
Question paper found on page 12 / 16 pages total, pdf
oxide layer that prevents corrosion. Which set of properties help to explain the use of aluminium for cooking and storing food? A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4 32 Which statements about water are correct? 1 Water is treated with chlorine to kill bacteria. 2 Household water may contain salts in solution. 3 Water is used in
(A/s) Chemistry Feb/March 2020 paper 2 variant 2
Question paper found on page 5 / 16 pages total, pdf
decomposes slowly to form magnesium oxide and oxygen. MgO2(s) 1 MgO(s) + 2 O2(g) Use your answer to (g)(iii) and the data in the table to calculate the enthalpy change of this reaction. If you were unable to obtain an answer to (g)(iii), use the value ∆Hf = –550 kJ mol–1. This is not the correct answer. enthalpy change
(A/s) Chemistry Oct/Nov 2018 paper 4 variant 1
Question paper found on page 7 / 20 pages total, pdf
to show the total number of unpaired electrons in the 3d and 4s orbitals of each isolated gaseous atom. number of unpaired electrons 3d 4s Cr Mn Fe [2] (b) Solid potassium manganate( VII ), KMnO 4 , decomposes on heating manganese( IV ) oxide, potassium manganate( VI ) and a colourless gas. to form Construct an equation for this reaction. ............
(IGCSE) Chemistry Oct/Nov 2021 paper 4 variant 3
Question paper found on page 6 / 16 pages total, pdf
lead copper least reactive Aqueous lead(II) nitrate contains Pb2+ ions. Two experiments are carried out. In Experiment 1, magnesium is added to aqueous lead(II) nitrate. In Experiment 2, copper is added to aqueous lead(II) nitrate. Write an ionic equation for any reaction that occurs in each experiment. If no reaction occurs write ‘no reaction’. Experiment 1 .................
(IGCSE) Chemistry Feb/March 2016 paper 4 variant 2
Question paper found on page 6 / 16 pages total, pdf
decomposes into water and oxygen in the presence of a catalyst, manganese( IV ) oxide. 2H 2 O 2 (aq) → 2H 2 O(l) + O 2 (g) (a) What is meant by the term catalyst ? ..............................................................