Stoichiometry — Paper 1 · IGCSE Physical Science 0652

5 A molecule of compound X contains the following. 2 atoms of carbon, C 2 atoms of oxygen, O 4 atoms of hydrogen, H What is the formula of X? A (CH2)2O B (CH2)2O2 C C2(OH)4 D C4H2O

1 marks

Answer: B

This question in 0652/11 Oct/Nov 2009

4 Some reactions of sulfuric acid are shown. H2SO4 + 2KHCO3 → K2SO4 + 2H2O + 2CO2 H2SO4 + 2KOH → K2SO4 + 2H2O H2SO4 + MgCO3 → MgSO4 + H2O + CO2 H2SO4 + MgO → MgSO4 + H2O Which compound gives the greatest mass of water when 10 g of it reacts with an excess of sulfuric acid? [Mr : MgO, 40; MgCO3, 84; KOH, 56; KHCO3, 100] A KHCO3 B KOH C MgCO3 D MgO

1 marks

Answer: D

This question in 0652/11 Oct/Nov 2010

4 Ethyl ethanoate has the formula CH3CO2C2H5. What is the relative molecular mass Mr of this compound? A 48 B 72 C 88 D 124

1 marks

Answer: C

This question in 0652/11 Oct/Nov 2011

6 Ethyl ethanoate has the formula CH3CO2C2H5. What is the relative molecular mass Mr of this compound? A 48 B 72 C 88 D 124

1 marks

Answer: C

This question in 0652/12 Oct/Nov 2011

4 Which expression shows how the relative atomic mass (Ar) of an element is calculated? A mass of one atom of an element × mass of one atom of C-12 B mass of one atom of an element × mass of one atom of C-12 × 12 C mass of one atom of an element × 12 mass of one atom of C-12 D mass of one atom of an element mass of one atom of C-12 × 12

1 marks

Answer: C

This question in 0652/11 Oct/Nov 2013

4 Which expression shows how the relative atomic mass (Ar) of an element is calculated? A mass of one atom of an element × mass of one atom of C-12 B mass of one atom of an element × mass of one atom of C-12 × 12 C mass of one atom of an element × 12 mass of one atom of C-12 D mass of one atom of an element mass of one atom of C-12 × 12

1 marks

Answer: C

This question in 0652/12 Oct/Nov 2013

4 What is the relative formula mass of CuSO4.5H2O? A 178 B 186 C 212 D 250

1 marks

Answer: D

This question in 0652/11 Oct/Nov 2014

4 What is the relative formula mass of CuSO4.5H2O? A 178 B 186 C 212 D 250

1 marks

Answer: D

This question in 0652/12 Oct/Nov 2014

5 Ethyl ethanoate has the formula CH3CO2C2H5. What is the relative molecular mass Mr of this compound? A 48 B 72 C 88 D 124

1 marks

Answer: C

This question in 0652/11 Oct/Nov 2015

6 Boron, B, forms an oxide. Which equation is balanced? A 2B + 3O2 → B2O3 B 2B + 3O2 → 2B2O3 C 4B + 2O2 → 2B2O3 D 4B + 3O2 → 2B2O3

1 marks

Answer: D

This question in 0652/11 Oct/Nov 2015

5 Ethyl ethanoate has the formula CH3CO2C2H5. What is the relative molecular mass Mr of this compound? A 48 B 72 C 88 D 124

1 marks

Answer: C

This question in 0652/12 Oct/Nov 2015

6 Boron, B, forms an oxide. Which equation is balanced? A 2B + 3O2 → B2O3 B 2B + 3O2 → 2B2O3 C 4B + 2O2 → 2B2O3 D 4B + 3O2 → 2B2O3

1 marks

Answer: D

This question in 0652/12 Oct/Nov 2015

6 X is a compound that contains the elements potassium, manganese and oxygen. X has twice as many potassium atoms as manganese atoms and twice as many oxygen atoms as potassium atoms. What is the formula of X? A KMnO2 B K2MnO2 C K2MnO4 D KMn2O4

1 marks

Answer: C

This question in 0652/11 Oct/Nov 2016

7 What is the relative formula mass, Mr, of lead nitrate, Pb(NO3)2? A 237 B 269 C 317 D 331

1 marks

Answer: D

This question in 0652/11 Oct/Nov 2016

6 X is a compound that contains the elements potassium, manganese and oxygen. X has twice as many potassium atoms as manganese atoms and twice as many oxygen atoms as potassium atoms. What is the formula of X? A KMnO2 B K2MnO2 C K2MnO4 D KMn2O4

1 marks

Answer: C

This question in 0652/12 Oct/Nov 2016

7 What is the relative formula mass, Mr, of lead nitrate, Pb(NO3)2? A 237 B 269 C 317 D 331

1 marks

Answer: D

This question in 0652/12 Oct/Nov 2016

4 Sodium carbonate reacts with hydrochloric acid to form sodium chloride, carbon dioxide and water. What is the balanced equation for the reaction? A Na2CO3 + HCl → NaCl + CO2 + H2O B Na2CO3 + 2HCl → NaCl + CO2 + H2O C Na2CO3 + HCl → 2NaCl + CO2 + H2O D Na2CO3 + 2HCl → 2NaCl + CO2 + H2O

1 marks

Answer: D

This question in 0652/11 Oct/Nov 2017

5 Which compound has the largest relative molecular mass, Mr? A CO2 B NO2 C SiO2 D SO2

1 marks

Answer: D

This question in 0652/11 Oct/Nov 2017

4 Sodium carbonate reacts with hydrochloric acid to form sodium chloride, carbon dioxide and water. What is the balanced equation for the reaction? A Na2CO3 + HCl → NaCl + CO2 + H2O B Na2CO3 + 2HCl → NaCl + CO2 + H2O C Na2CO3 + HCl → 2NaCl + CO2 + H2O D Na2CO3 + 2HCl → 2NaCl + CO2 + H2O

1 marks

Answer: D

This question in 0652/12 Oct/Nov 2017

5 Which compound has the largest relative molecular mass, Mr? A CO2 B NO2 C SiO2 D SO2

1 marks

Answer: D

This question in 0652/12 Oct/Nov 2017

6 Hydrogen reacts with oxygen to form water. The word equation is shown. hydrogen + oxygen → water What is the symbol equation for this reaction? A H2 + O → H2O B H2 + O2 → H2O C H2 + O2 → H2O2 D 2H2 + O2 → 2H2O

1 marks

Answer: D

This question in 0652/11 Oct/Nov 2018

7 The formulae of three substances are shown. 1 NO2 2 C2H5OH 3 C3H8 Which substances have a relative molecular mass of 46? A 1, 2 and 3 B 1 and 2 only C 1 only D 2 only

1 marks

Answer: B

This question in 0652/11 Oct/Nov 2018

6 Hydrogen reacts with oxygen to form water. The word equation is shown. hydrogen + oxygen → water What is the symbol equation for this reaction? A H2 + O → H2O B H2 + O2 → H2O C H2 + O2 → H2O2 D 2H2 + O2 → 2H2O

1 marks

Answer: D

This question in 0652/12 Oct/Nov 2018

7 The formulae of three substances are shown. 1 NO2 2 C2H5OH 3 C3H8 Which substances have a relative molecular mass of 46? A 1, 2 and 3 B 1 and 2 only C 1 only D 2 only

1 marks

Answer: B

This question in 0652/12 Oct/Nov 2018

5 X is a compound that contains the elements potassium, manganese and oxygen. X has twice as many potassium atoms as manganese atoms, and twice as many oxygen atoms as potassium atoms. What is the formula of X? A KMnO2 B K2MnO2 C K2MnO4 D KMn2O4

1 marks

Answer: C

This question in 0652/11 Oct/Nov 2019

5 X is a compound that contains the elements potassium, manganese and oxygen. X has twice as many potassium atoms as manganese atoms, and twice as many oxygen atoms as potassium atoms. What is the formula of X? A KMnO2 B K2MnO2 C K2MnO4 D KMn2O4

1 marks

Answer: C

This question in 0652/12 Oct/Nov 2019

8 The formula of aluminium sulfate is Al 2(SO4)3. Which row shows the number of atoms of each element in aluminium sulfate? Al S O A 2 1 4 B 2 1 12 C 2 3 4 D 2 3 12

1 marks

Answer: D

This question in 0652/11 Oct/Nov 2020

6 Cryolite is an ore of aluminium. It contains sodium, aluminium and fluorine atoms. Cryolite contains three times as many atoms of sodium than aluminium and two times as many atoms of fluorine than sodium. What is the formula of cryolite? A NaAl F2 B NaAl 3F6 C Na3Al F2 D Na3Al F6

1 marks

Answer: D

This question in 0652/11 Oct/Nov 2021

7 A hydrocarbon burns in excess oxygen, forming carbon dioxide and water. Part of the equation is shown. … + 5O2  3CO2 + 4H2O What needs to be added to the equation in order to balance it? A 3CH4 B C3H4 C C3H8 D C3H7OH

1 marks

Answer: C

This question in 0652/11 Oct/Nov 2021

5 Pentane, C5H12, burns in oxygen. C5H12 + xO2 → 5CO2 + yH2O Which values of x and y balance the equation? x y A 4 6 B 4 12 C 8 6 D 8 12

1 marks

Answer: C

This question in 0652/11 Oct/Nov 2022

7 An equation for the reaction of sodium with water is shown. xNa + yH2O → zNaOH + H2 Which values of x, y and z balance the equation? x y z A 1 2 1 B 2 1 2 C 2 2 2 D 2 3 2

1 marks

Answer: C

This question in 0652/11 Oct/Nov 2023

7 An equation for the reaction of sodium with water is shown. xNa + yH2O → zNaOH + H2 Which values of x, y and z balance the equation? x y z A 1 2 1 B 2 1 2 C 2 2 2 D 2 3 2

1 marks

Answer: C

This question in 0652/12 Oct/Nov 2023

7 A hydrocarbon burns in excess oxygen. Part of the equation for the reaction is shown. … + 5O2  3CO2 + 4H2O What needs to be added to the equation in order to balance it? A C3H8 B C3H4 C 3CH4 D C3H7OH

1 marks

Answer: A

This question in 0652/11 Oct/Nov 2024

17 A sample of clean dry air contains 20% oxygen. It is passed repeatedly over hot copper, as shown. clean dry air copper heat The volume of air decreases by 15 cm3. What is the starting volume of the sample of air? A 30 cm3 B 50 cm3 C 75 cm3 D 100 cm3

1 marks

Answer: C

This question in 0652/11 Oct/Nov 2024