Questions as text
Q1 · Which equation shows the complete combustion of ethane, C2H6? 0653/11 Oct/Nov 2005
27 Which equation shows the complete combustion of ethane, C2H6? A C2H6 + 3O2 → CO + CO2 + 3H2O B 2C2H6 + 3O2 → 4C + 6H2O C 2C2H6 + 5O2 → 4CO + 6H2O D 2C2H6 + 7O2 → 4CO2 + 6H2O
1 marks
Answer: D
This question in 0653/11 Oct/Nov 2005
Q2 · An oxide of lead is changed to lead by heating it with carbon 0653/11 Oct/Nov 2007
19 An oxide of lead is changed to lead by heating it with carbon. Pb xO y + 2C 3Pb + 2CO2 What is the formula of this oxide of lead? A Pb2O3 B Pb3O2 C Pb3O4 D Pb4O3
1 marks
Answer: C
This question in 0653/11 Oct/Nov 2007
Q3 · What does a word equation show? 0653/11 Oct/Nov 2008
17 What does a word equation show?
the changes that
the speed of
occur in a reaction a reaction
A v v
B v x
Cc x v
D x x
1 marks
Answer: B
This question in 0653/11 Oct/Nov 2008
Q4 · Which formula contains the most elements? 0653/11 Oct/Nov 2008
18 Which formula contains the most elements? A NaOH B Rb2S C SiCl 4 D SnO2
1 marks
Answer: A
This question in 0653/11 Oct/Nov 2008
Q5 · Urea, (NH2)2CO, is used as a fertiliser 0653/11 Oct/Nov 2008
19 Urea, (NH2)2CO, is used as a fertiliser. How many atoms or molecules are combined in urea? A atoms: nitrogen, 1; hydrogen, 2; carbon, 2; oxygen, 2 B atoms: nitrogen, 2; hydrogen, 4; carbon, 1; oxygen, 1 C molecules: ammonia, 1; carbon monoxide, 2 D molecules: ammonia, 2; carbon monoxide, 1
1 marks
Answer: B
This question in 0653/11 Oct/Nov 2008
Q6 · A molecule of phosphoric acid contains three hydrogen atoms, one phosphorus atom and four… 0653/11 May/June 2009
18 A molecule of phosphoric acid contains three hydrogen atoms, one phosphorus atom and four oxygen atoms. What is the correct formula for this molecule? A 3HP4O B 3HPO4 C H3PO4 D H3(PO)4
1 marks
Answer: C
This question in 0653/11 May/June 2009
Q7 · The salt ammonium dichromate(VI) readily decomposes when heated 0653/11 May/June 2010
18 The salt ammonium dichromate(VI) readily decomposes when heated. (NH4)2Cr2O7 → Cr2O3 + x N2 + y H2O Which values of x and y make this equation balanced? x y A 1 2 B 1 4 C 2 2 D 2 4
1 marks
Answer: B
This question in 0653/11 May/June 2010
Q8 · The salt ammonium dichromate(VI) readily decomposes when heated 0653/12 May/June 2010
19 The salt ammonium dichromate(VI) readily decomposes when heated. (NH4)2Cr2O7 → Cr2O3 + x N2 + y H2O Which values of x and y make this equation balanced? x y A 1 2 B 1 4 C 2 2 D 2 4
1 marks
Answer: B
This question in 0653/12 May/June 2010
Q9 · The salt ammonium dichromate(VI) readily decomposes when heated 0653/13 May/June 2010
19 The salt ammonium dichromate(VI) readily decomposes when heated. (NH4)2Cr2O7 → Cr2O3 + x N2 + y H2O Which values of x and y make this equation balanced? x y A 1 2 B 1 4 C 2 2 D 2 4
1 marks
Answer: B
This question in 0653/13 May/June 2010
Q10 · The equation represents the reaction of aluminium with sulfuric acid 0653/11 Oct/Nov 2010
18 The equation represents the reaction of aluminium with sulfuric acid. x Al + 3H2SO4 → Al 2(SO4)3 + y H2 What are the correct values of x and y ? x y A 2 3 B 2 6 C 3 3 D 3 6
1 marks
Answer: A
This question in 0653/11 Oct/Nov 2010
Q11 · The equation represents the reaction of aluminium with sulfuric acid 0653/12 Oct/Nov 2010
19 The equation represents the reaction of aluminium with sulfuric acid. x Al + 3H2SO4 → Al 2(SO4)3 + y H2 What are the correct values of x and y ? x y A 2 3 B 2 6 C 3 3 D 3 6
1 marks
Answer: A
This question in 0653/12 Oct/Nov 2010
Q12 · The equation represents the reaction of aluminium with sulfuric acid 0653/13 Oct/Nov 2010
20 The equation represents the reaction of aluminium with sulfuric acid. x Al + 3H2SO4 → Al 2(SO4)3 + y H2 What are the correct values of x and y ? x y A 2 3 B 2 6 C 3 3 D 3 6
1 marks
Answer: A
This question in 0653/13 Oct/Nov 2010
Q13 · Which equation is correctly balanced and shows the correct formulae? 0653/11 May/June 2011
17 Which equation is correctly balanced and shows the correct formulae? A H2 + Cl 2 → H2Cl 2 B H2 + Cl 2 → 2HCl C 2H + 2Cl 2 → H2Cl 2 D 2H + Cl 2 → 2HCl 2
1 marks
Answer: B
This question in 0653/11 May/June 2011
Q14 · Which equation is correctly balanced and shows the correct formulae? 0653/12 May/June 2011
15 Which equation is correctly balanced and shows the correct formulae? A H2 + Cl 2 → H2Cl 2 B H2 + Cl 2 → 2HCl C 2H + 2Cl 2 → H2Cl 2 D 2H + Cl 2 → 2HCl 2
1 marks
Answer: B
This question in 0653/12 May/June 2011
Q15 · Which equation is correctly balanced? 0653/11 Oct/Nov 2011
17 Which equation is correctly balanced? A 2Al + 3Cl 2 → 2Al Cl 3 B Fe2O3 + 3C → 2Fe + 3CO2 C KCl + Br2 → KBr + Cl 2 D Na + H2O → NaOH + H2
1 marks
Answer: A
This question in 0653/11 Oct/Nov 2011
Q16 · Which equation is correctly balanced? 0653/12 Oct/Nov 2011
18 Which equation is correctly balanced? A 2Al + 3Cl 2 → 2Al Cl 3 B Fe2O3 + 3C → 2Fe + 3CO2 C KCl + Br2 → KBr + Cl 2 D Na + H2O → NaOH + H2
1 marks
Answer: A
This question in 0653/12 Oct/Nov 2011
Q17 · Which equation is correctly balanced? 0653/13 Oct/Nov 2011
19 Which equation is correctly balanced? A 2Al + 3Cl 2 → 2Al Cl 3 B Fe2O3 + 3C → 2Fe + 3CO2 C KCl + Br2 → KBr + Cl 2 D Na + H2O → NaOH + H2
1 marks
Answer: A
This question in 0653/13 Oct/Nov 2011
Q18 · Information about two minerals is given below 0653/11 May/June 2012
16 Information about two minerals is given below. name of mineral formula anorthite CaAl 2Si2O8 orthoclase KAl Si3O8 Which information about anorthite and orthoclase is correct? A Both of them contain the same number of atoms of aluminium. B Both of them contain the same number of atoms of oxygen. C Orthoclase contains the same number of atoms of both aluminium and silicon. D Orthoclase contains twice as many atoms of aluminium as anorthite.
1 marks
This question in 0653/11 May/June 2012
Q19 · The diagram shows a molecule of a compound of silicon and hydrogen 0653/11 Oct/Nov 2013
26 The diagram shows a molecule of a compound of silicon and hydrogen. H H H Si Si H H H What is the molecular formula of this compound? A SiH3 B SiH4 C Si2H6 D Si6H2
1 marks
Answer: C
This question in 0653/11 Oct/Nov 2013
Q20 · The diagram shows a molecule of a compound of silicon and hydrogen 0653/12 Oct/Nov 2013
26 The diagram shows a molecule of a compound of silicon and hydrogen. H H H Si Si H H H What is the molecular formula of this compound? A SiH3 B SiH4 C Si2H6 D Si6H2
1 marks
Answer: C
This question in 0653/12 Oct/Nov 2013
Q21 · A molecule of phosphoric acid contains three hydrogen atoms, one phosphorus atom and four… 0653/11 May/June 2014
19 A molecule of phosphoric acid contains three hydrogen atoms, one phosphorus atom and four oxygen atoms. What is the formula of this molecule? A H3PO4 B H3(PO)4 C 3HPO4 D 3HP4O
1 marks
Answer: A
This question in 0653/11 May/June 2014
Q22 · A molecule of phosphoric acid contains three hydrogen atoms, one phosphorus atom and four… 0653/12 May/June 2014
18 A molecule of phosphoric acid contains three hydrogen atoms, one phosphorus atom and four oxygen atoms. What is the formula of this molecule? A H3PO4 B H3(PO)4 C 3HPO4 D 3HP4O
1 marks
Answer: A
This question in 0653/12 May/June 2014
Q23 · The formula for iron(III) sulfate is Fe2(SO4)3 0653/12 May/June 2014
19 The formula for iron(III) sulfate is Fe2(SO4)3. What is the total number of atoms in this formula? A 3 B 7 C 17 D 26
1 marks
Answer: C
This question in 0653/12 May/June 2014
Q24 · A molecule of phosphoric acid contains three hydrogen atoms, one phosphorus atom and four… 0653/13 May/June 2014
18 A molecule of phosphoric acid contains three hydrogen atoms, one phosphorus atom and four oxygen atoms. What is the formula of this molecule? A H3PO4 B H3(PO)4 C 3HPO4 D 3HP4O
1 marks
Answer: A
This question in 0653/13 May/June 2014
Q25 · The fertiliser ammonium sulfate has the formula (NH4)2SO4 0653/11 Oct/Nov 2014
15 The fertiliser ammonium sulfate has the formula (NH4)2SO4. How many atoms of each element are present? number of number of number of number of hydrogen atoms nitrogen atoms oxygen atoms sulfur atoms A 4 1 1 1 B 4 2 4 1 C 8 1 4 1 D 8 2 4 1
1 marks
Answer: D
This question in 0653/11 Oct/Nov 2014
Q26 · The fertiliser ammonium sulfate has the formula (NH4)2SO4 0653/12 Oct/Nov 2014
16 The fertiliser ammonium sulfate has the formula (NH4)2SO4. How many atoms of each element are present? number of number of number of number of hydrogen atoms nitrogen atoms oxygen atoms sulfur atoms A 4 1 1 1 B 4 2 4 1 C 8 1 4 1 D 8 2 4 1
1 marks
Answer: D
This question in 0653/12 Oct/Nov 2014
Q27 · The formulae of two minerals are given below 0653/13 Oct/Nov 2014
15 The formulae of two minerals are given below. name of mineral formula andalusite Al2SiO5 olivine Fe2Mg2SiO4 Which statement about the formulae of andalusite and olivine is correct? A They contain the same metals. B They contain the same number of oxygen atoms. C They contain the same number of silicon atoms. D They contain the same total number of atoms.
1 marks
Answer: C
This question in 0653/13 Oct/Nov 2014
Q28 · How many atoms of hydrogen are present in three molecules of ammonia, NH3 0653/12 May/June 2015
14 How many atoms of hydrogen are present in three molecules of ammonia, NH3. A 3 B 6 C 9 D 12
1 marks
Answer: C
This question in 0653/12 May/June 2015
Q29 · The structures of three molecules are shown 0653/13 May/June 2015
14 The structures of three molecules are shown. water ethanol methane How many atoms are in each of these molecules? water ethanol methane A 2 3 2 B 2 4 5 C 3 3 2 D 3 9 5
1 marks
Answer: D
This question in 0653/13 May/June 2015
Q30 · Sodium nitrate contains one atom of sodium, one atom of nitrogen and three atoms of oxygen 0653/13 May/June 2015
17 Sodium nitrate contains one atom of sodium, one atom of nitrogen and three atoms of oxygen. What is the formula of sodium nitrate? A NaN3O B NaNO3 C SN3O D SNO3
1 marks
Answer: B
This question in 0653/13 May/June 2015
Q31 · The structure of a compound is shown 0653/11 Oct/Nov 2015
17 The structure of a compound is shown. H H H O O O H C C C H H H H What is the formula of this compound? A C3H5O3 B C3H6O3 C C3H8O D C3H8O3
1 marks
Answer: D
This question in 0653/11 Oct/Nov 2015
Q32 · A model of a molecule is shown 0653/12 May/June 2016
16 A model of a molecule is shown. key hydrogen sulfur Which row describes this molecule? type of formula substance A HS compound B HS mixture C H2S2 compound D H2S2 mixture
1 marks
Answer: C
This question in 0653/12 May/June 2016
Q33 · What does a word equation show? 0653/11 Oct/Nov 2016
18 What does a word equation show?
the changes that the speed of
occur in a reaction a reaction
A Jv Jv
B Jv x
Cc x v
D x x
1 marks
Answer: B
This question in 0653/11 Oct/Nov 2016
Q34 · What does a word equation show? 0653/12 Oct/Nov 2016
18 What does a word equation show?
the changes that the speed of
occur in a reaction a reaction
1 marks
Answer: B
This question in 0653/12 Oct/Nov 2016
Q35 · Which row shows the formulae of sodium hydroxide and of potassium hydroxide? 0653/12 Feb/March 2017
18 Which row shows the formulae of sodium hydroxide and of potassium hydroxide? sodium potassium hydroxide hydroxide A NaOH KOH B NaOH POH C SOH KOH D SOH POH
1 marks
Answer: A
This question in 0653/12 Feb/March 2017
Q36 · A compound contains three times as many oxygen atoms as nitrogen atoms 0653/11 Oct/Nov 2017
17 A compound contains three times as many oxygen atoms as nitrogen atoms. It contains the same number of sodium atoms as nitrogen atoms. What is its formula? A NaNO3 B Na(NO)3 C Na3(NO)3 D Na3N3O
1 marks
Answer: A
This question in 0653/11 Oct/Nov 2017
Q37 · One molecule of a compound contains twice as many carbon atoms as oxygen atoms, and three… 0653/13 Oct/Nov 2017
17 One molecule of a compound contains twice as many carbon atoms as oxygen atoms, and three times as many hydrogen atoms as carbon atoms. What is the formula of this compound? A C2H3O B C2H6O C C2H6O2 D C4H6O2
1 marks
Answer: B
This question in 0653/13 Oct/Nov 2017
Q38 · What is the formula of sulfuric acid? 0653/12 Feb/March 2018
18 What is the formula of sulfuric acid? A HSO3 B HSO4 C H2SO3 D H2SO4
1 marks
Answer: D
This question in 0653/12 Feb/March 2018
Q39 · The diagram represents molecules of phosphine 0653/11 May/June 2018
18 The diagram represents molecules of phosphine. H H H P P H H H H H H P P H H H What is the formula of a molecule of phosphine? A HP B HP3 C PH3 D P4H12
1 marks
Answer: C
This question in 0653/11 May/June 2018
Q40 · Which formula represents a molecule that contains three different elements? 0653/12 May/June 2018
18 Which formula represents a molecule that contains three different elements? A CO2 B H2O C O3 D NOCl
1 marks
Answer: D
This question in 0653/12 May/June 2018
Q41 · Which formula represents a molecule that contains three different elements? 0653/13 May/June 2018
18 Which formula represents a molecule that contains three different elements? A CO2 B H2O C O3 D NOCl
1 marks
Answer: D
This question in 0653/13 May/June 2018
Q42 · On which label does the formula match the name of the acid? 0653/11 Oct/Nov 2018
16 On which label does the formula match the name of the acid? A B C D hydrochloric hydrochloric sulfuric sulfuric acid acid acid acid HCl H2SO4 HNO3 Na2SO4
1 marks
Answer: A
This question in 0653/11 Oct/Nov 2018
Q43 · Aluminium sulfate contains two aluminium atoms, three sulfur atoms and twelve oxygen atoms 0653/11 May/June 2019
17 Aluminium sulfate contains two aluminium atoms, three sulfur atoms and twelve oxygen atoms. What is the formula of aluminium sulfate? A 2Al 3S6O B 2Al S3O12 C Al 2(SO4)3 D Al 23(SO4)
1 marks
Answer: C
This question in 0653/11 May/June 2019
Q44 · The equation for the combustion of ethene is shown 0653/12 May/June 2019
17 The equation for the combustion of ethene is shown. C2H4 + 3O2 → 2CO2 + 2H2O Which statement about this reaction is not correct? A More oxygen molecules than ethene molecules are used. B The number of carbon dioxide molecules formed is equal to the number of water molecules formed. C The number of carbon dioxide molecules formed is the same as the number of ethene molecules used. D The total number of molecules formed is the same as the total number of molecules used.
1 marks
Answer: C
This question in 0653/12 May/June 2019
Q45 · The equation for the reaction between magnesium and dilute hydrochloric acid is shown 0653/13 May/June 2019
16 The equation for the reaction between magnesium and dilute hydrochloric acid is shown. Mg + xHCl → MgCl 2 + yH2 What are the values of x and y? x y A 1 1 B 1 2 C 2 1 D 2 2
1 marks
Answer: C
This question in 0653/13 May/June 2019
Q46 · The fertiliser ammonium sulfate has the formula (NH4)2SO4 0653/11 Oct/Nov 2019
17 The fertiliser ammonium sulfate has the formula (NH4)2SO4. How many atoms of each element are present in the formula? number of number of number of number of hydrogen atoms nitrogen atoms oxygen atoms sulfur atoms A 4 1 1 1 B 4 2 4 1 C 8 1 4 1 D 8 2 4 1
1 marks
Answer: D
This question in 0653/11 Oct/Nov 2019
Q47 · The fertiliser ammonium sulfate has the formula (NH4)2SO4 0653/12 Oct/Nov 2019
17 The fertiliser ammonium sulfate has the formula (NH4)2SO4. How many atoms of each element are present in the formula? number of number of number of number of hydrogen atoms nitrogen atoms oxygen atoms sulfur atoms A 4 1 1 1 B 4 2 4 1 C 8 1 4 1 D 8 2 4 1
1 marks
Answer: D
This question in 0653/12 Oct/Nov 2019
Q48 · The fertiliser ammonium sulfate has the formula (NH4)2SO4 0653/13 Oct/Nov 2019
17 The fertiliser ammonium sulfate has the formula (NH4)2SO4. How many atoms of each element are present in the formula? number of number of number of number of hydrogen atoms nitrogen atoms oxygen atoms sulfur atoms A 4 1 1 1 B 4 2 4 1 C 8 1 4 1 D 8 2 4 1
1 marks
Answer: D
This question in 0653/13 Oct/Nov 2019
Q49 · Calcium hydroxide contains one calcium atom, two oxygen atoms and two hydrogen atoms 0653/11 May/June 2020
18 Calcium hydroxide contains one calcium atom, two oxygen atoms and two hydrogen atoms. What is the correct formula of calcium hydroxide? A CaOH B Ca(OH)2 C CaOH2 D CaO2H2
1 marks
Answer: B
This question in 0653/11 May/June 2020
Q50 · Which equation is balanced? 0653/11 Oct/Nov 2020
17 Which equation is balanced? A Cu + O2 CuO B 2CO + O2 2CO2 C 2Mg + 2HCl MgCl 2 + H2 D 2N2 + 3H2 2NH3
1 marks
Answer: B
This question in 0653/11 Oct/Nov 2020
Q51 · Which equation for the complete combustion of propane, C3H8, is correct? 0653/12 Oct/Nov 2020
17 Which equation for the complete combustion of propane, C3H8, is correct? A C3H8 + 2O2 3C + 4H2O B 2C3H8 + 3O2 6CO + 8H2 C C3H8 + 5O2 3CO2 + 4H2O D C3H8 + 3O2 3CO2 + 4H2
1 marks
Answer: C
This question in 0653/12 Oct/Nov 2020
Q52 · The equation for the complete combustion of ethane, C2H6, is shown 0653/11 Oct/Nov 2021
18 The equation for the complete combustion of ethane, C2H6, is shown. 2C2H6 + 7O2 4CO2 + 6H2O What is the total number of product molecules formed per molecule of ethane in this reaction? A 2 B 5 C 6 D 10
1 marks
Answer: B
This question in 0653/11 Oct/Nov 2021
Q53 · What is the chemical formula of nitric acid? 0653/11 May/June 2022
18 What is the chemical formula of nitric acid? A HCl B HNO3 C H2SO4 D NH3
1 marks
Answer: B
This question in 0653/11 May/June 2022
Q54 · Which row shows the correct formula for the named acid? 0653/12 May/June 2022
18 Which row shows the correct formula for the named acid? acid formula A nitric acid HCl B nitric acid HNO3 C sulfuric acid HCl D sulfuric acid HNO3
1 marks
Answer: B
This question in 0653/12 May/June 2022
Q55 · The equation for the reaction between sodium and water is shown 0653/11 Oct/Nov 2022
15 The equation for the reaction between sodium and water is shown. wNa + xH2O yNaOH + zH2 Which values of w, x, y and z balance this equation? w x y z A 1 1 1 1 B 1 2 1 2 C 2 1 2 1 D 2 2 2 1
1 marks
Answer: D
This question in 0653/11 Oct/Nov 2022
Q56 · In boron chloride, 25% of the atoms are boron 0653/12 Oct/Nov 2022
15 In boron chloride, 25% of the atoms are boron. What is the formula of boron chloride? A BCl B BCl 3 C B2Cl 3 D B3Cl
1 marks
Answer: B
This question in 0653/12 Oct/Nov 2022
Q57 · In boron chloride, 25% of the atoms are boron 0653/13 Oct/Nov 2022
15 In boron chloride, 25% of the atoms are boron. What is the formula of boron chloride? A BCl B BCl 3 C B2Cl 3 D B3Cl
1 marks
Answer: B
This question in 0653/13 Oct/Nov 2022
Q58 · The structures of three molecules are shown 0653/12 Feb/March 2023
14 The structures of three molecules are shown. water ethanol methane How many atoms are in each molecule? water ethanol methane A 2 3 2 B 2 4 5 C 3 3 2 D 3 9 5
1 marks
Answer: D
This question in 0653/12 Feb/March 2023
Q59 · Which symbol equation is balanced? 0653/12 Feb/March 2023
15 Which symbol equation is balanced? A H2 + Cl 2 HCl B Mg + 2HCl MgCl 2 + H2 C CH4 + O2 CO2 + 2H2O D Mg + O2 2MgO
1 marks
Answer: B
This question in 0653/12 Feb/March 2023
Q60 · Which row shows the formula of sulfuric acid and the number of different elements it… 0653/11 May/June 2023
17 Which row shows the formula of sulfuric acid and the number of different elements it contains? number of formula elements A H2SO3 3 B H2SO3 6 C H2SO4 3 D H2SO4 7
1 marks
Answer: C
This question in 0653/11 May/June 2023
Q61 · A compound contains twice as many atoms of caesium, Cs, as atoms of carbon 0653/11 Oct/Nov 2023
16 A compound contains twice as many atoms of caesium, Cs, as atoms of carbon. The compound contains three times as many atoms of oxygen as atoms of carbon. What is the formula of the compound? A CsCO3 B Cs2CO C Cs2CO3 D 2CsC3O
1 marks
Answer: C
This question in 0653/11 Oct/Nov 2023
Q62 · Read the sentences about calcium, copper and bromine 0653/11 Oct/Nov 2023
23 Read the sentences about calcium, copper and bromine. Calcium, copper and bromine are in the same period of the Periodic Table. The metals react with bromine to form calcium bromide and copper(II) bromide. From the position of these elements in the Periodic Table, it can be predicted that the bonding in the metal bromides is … 1 … and that … 2 … coloured. The formula of calcium bromide is … 3 … . Which words correctly complete gaps 1, 2 and 3? 1 2 3 A covalent both bromides are CaBr B covalent only copper(II) bromide is CaBr2 C ionic both bromides are CaBr D ionic only copper(II) bromide is CaBr2
1 marks
Answer: D
This question in 0653/11 Oct/Nov 2023
Q63 · Compound X contains one iron atom 0653/12 Oct/Nov 2023
16 Compound X contains one iron atom. It also contains the same number of sulfur atoms as iron atoms and four times as many oxygen atoms as sulfur atoms. What is the formula of compound X? A Fe(SO)4 B FeSO4 C FeS4O D Fe4S4O
1 marks
Answer: B
This question in 0653/12 Oct/Nov 2023
Q64 · Compound X contains one iron atom 0653/13 Oct/Nov 2023
16 Compound X contains one iron atom. It also contains the same number of sulfur atoms as iron atoms and four times as many oxygen atoms as sulfur atoms. What is the formula of compound X? A Fe(SO)4 B FeSO4 C FeS4O D Fe4S4O
1 marks
Answer: B
This question in 0653/13 Oct/Nov 2023
Q65 · Sodium chloride is represented by NaCl 0653/11 May/June 2024
17 Sodium chloride is represented by NaCl. What is this representation called? A a dot-and-cross diagram B an equation C a formula D a symbol
1 marks
Answer: C
This question in 0653/11 May/June 2024
Q66 · The diagram shows representations of some substances 0653/12 May/June 2024
14 The diagram shows representations of some substances. N N H O H O C O O O H O H Which row identifies the total number of atoms and the total number of molecules in this diagram? number of number of atoms molecules A 4 5 B 10 4 C 13 4 D 13 5
1 marks
Answer: D
This question in 0653/12 May/June 2024
Q67 · What is the formula of nitric acid? 0653/12 May/June 2024
17 What is the formula of nitric acid? A HCl B HNO3 C NaOH D NH3
1 marks
Answer: B
This question in 0653/12 May/June 2024
Q68 · Urea, (NH2)2CO, is used as a fertiliser 0653/13 May/June 2024
18 Urea, (NH2)2CO, is used as a fertiliser. How many atoms or molecules are represented by the formula for urea? A atoms: nitrogen, 1; hydrogen, 2; carbon, 2; oxygen, 2 B atoms: nitrogen, 2; hydrogen, 4; carbon, 1; oxygen, 1 C molecules: ammonia, 1; carbon monoxide, 2 D molecules: ammonia, 2; carbon monoxide, 1
1 marks
Answer: B
This question in 0653/13 May/June 2024
Q69 · Aluminium sulfate contains two aluminium atoms, three sulfur atoms and twelve oxygen atoms 0653/11 Oct/Nov 2024
15 Aluminium sulfate contains two aluminium atoms, three sulfur atoms and twelve oxygen atoms. What is the formula of aluminium sulfate? A 2Al 3S6O B 2Al S3O12 C Al 2(SO4)3 D Al 23(SO4)
1 marks
Answer: C
This question in 0653/11 Oct/Nov 2024
Q70 · The unbalanced equation for the reaction between aqueous sodium hydroxide and dilute… 0653/11 May/June 2025
16 The unbalanced equation for the reaction between aqueous sodium hydroxide and dilute sulfuric acid is shown. wNaOH + xH2SO4 yNa2SO4 + zH2O Which values of w, x, y and z balance the equation? w x y z A 2 1 1 2 B 2 1 2 1 C 1 1 1 1 D 1 2 1 1
1 marks
Answer: A
This question in 0653/11 May/June 2025
Q71 · The ratio of the atoms Na : C : O in sodium carbonate is 2 : 1 : 3 0653/12 May/June 2025
16 The ratio of the atoms Na : C : O in sodium carbonate is 2 : 1 : 3. What is the formula of sodium carbonate? A Na2CO3 B Na2(CO)3 C 2NaCO3 D 2Na2(CO3)2
1 marks
Answer: A
This question in 0653/12 May/June 2025
Q72 · Which equation is balanced? 0653/12 May/June 2025
17 Which equation is balanced? A 2CO + O2 2CO2 B Cu + O2 CuO C 2Mg + 2HCl MgCl 2 + H2 D 2N2 + 3H2 2NH3
1 marks
Answer: A
This question in 0653/12 May/June 2025
1 / 15
2 / 15
3 / 15
4 / 15
5 / 15
6 / 15
7 / 15
8 / 15
9 / 15
10 / 15
11 / 15
12 / 15
13 / 15
14 / 15
15 / 15