OCR A Level Chemistry A June 2024 Paper 1 (H432-01)//
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SECTION A
You should spend a maximum of 20 minutes on this section.
Write your answer to each question in the dashes provided.
Oxygen has the electron configuration 1s22s22p4.
How are the electrons in an atom of oxygen arranged in the p-orbitals?
A
↑↑ ↑↑
B
↑↓ ↑↓
C
↑↑ ↑ ↑
D
↑↓ ↑ ↑
Answer_____________ [1]
1 /-Water has the anomalous properties below.
• Water has relatively high melting and boiling points.
• Ice is less dense than water.
Which statement explains these anomalous properties?
A The covalent bonding within water molecules.
B The hydrogen bonding between water molecules.
C The induced dipole–dipole interactions (London forces) between water molecules.
D The ionic bonding between water molecules.
Your answer______________
2 Which chemical process is the most sustainable in terms of the atom economy of the iron
produced?
A Fe2O3 + 3CO 2Fe + 3CO2
B Fe2O3 + 3H2 2Fe + 3H2O
C 2Fe2O3 4Fe + 3O2
, D 2Fe2O3 + 3C 4Fe + 3CO2
Your answer_____________
3 Which compounds of magnesium can be used as ‘antacids’?
A Chlorides
B Hydroxides
C Nitrates
D Sulfates
Your answer_________________-
4 Which statement explains the trend in boiling points down the halogens group?
A The bond enthalpy of the covalent bonds increases.
B The halogens become less electronegative.
C The induced dipole–dipole interactions (London forces) become stronger.
D The reactivity of the halogens decreases.
Your answer__________________
5 Which equation does not represent a disproportionation reaction?
A Cl2 + H2O HClO + HCl
B Cl2 + 2NaOH NaClO + NaCl + H2O
C 4KClO3 KCl + 3KClO4
D 4HCl + MnO2 MnCl2 + Cl2 + 2H2O
Your answer______________
6 The equation for the reaction of sulfuric acid with potassium hydroxide is shown below.
H2SO4(aq) + 2KOH(aq) K2SO4(aq) + 2H2O(l)
, 25 cm3 of 1.00 mol dm–3 H2SO4 is reacted with excess KOH.
The energy given out is 2.8 kJ.
What is the enthalpy change of neutralisation, in kJ mol–1?
A –56
B –70
C –112
D –224
Your answer_____________ [1]
7 Which row in the table explains how a catalyst affects the activation energy (Ea) and the
proportion of molecules with energy > Ea?
How the activation Proportion of molecules
energy changes with energy > Ea
A /-decreases decreases
B /-decreases increases
C /-increases decreases
D /-increases increases
Your answer __________- [1]
8 A graph of ln(k) is plotted against 1 / T for a reaction.
(k = rate constant, T = temperature in K.)
The gradient has the numerical value of –16 000.
What is the activation energy, in kJ mol–1, for this reaction?
A +1.92
B +133
C +1920
D +133 000
Your answer____________ [1]
9 A reaction is zero order with respect to a reactant.
Which rate–concentration graph for the reactant is the correct shape?
A
, 2
SECTION A
You should spend a maximum of 20 minutes on this section.
Write your answer to each question in the dashes provided.
Oxygen has the electron configuration 1s22s22p4.
How are the electrons in an atom of oxygen arranged in the p-orbitals?
A
↑↑ ↑↑
B
↑↓ ↑↓
C
↑↑ ↑ ↑
D
↑↓ ↑ ↑
Answer_____________ [1]
1 /-Water has the anomalous properties below.
• Water has relatively high melting and boiling points.
• Ice is less dense than water.
Which statement explains these anomalous properties?
A The covalent bonding within water molecules.
B The hydrogen bonding between water molecules.
C The induced dipole–dipole interactions (London forces) between water molecules.
D The ionic bonding between water molecules.
Your answer______________
2 Which chemical process is the most sustainable in terms of the atom economy of the iron
produced?
A Fe2O3 + 3CO 2Fe + 3CO2
B Fe2O3 + 3H2 2Fe + 3H2O
C 2Fe2O3 4Fe + 3O2
, D 2Fe2O3 + 3C 4Fe + 3CO2
Your answer_____________
3 Which compounds of magnesium can be used as ‘antacids’?
A Chlorides
B Hydroxides
C Nitrates
D Sulfates
Your answer_________________-
4 Which statement explains the trend in boiling points down the halogens group?
A The bond enthalpy of the covalent bonds increases.
B The halogens become less electronegative.
C The induced dipole–dipole interactions (London forces) become stronger.
D The reactivity of the halogens decreases.
Your answer__________________
5 Which equation does not represent a disproportionation reaction?
A Cl2 + H2O HClO + HCl
B Cl2 + 2NaOH NaClO + NaCl + H2O
C 4KClO3 KCl + 3KClO4
D 4HCl + MnO2 MnCl2 + Cl2 + 2H2O
Your answer______________
6 The equation for the reaction of sulfuric acid with potassium hydroxide is shown below.
H2SO4(aq) + 2KOH(aq) K2SO4(aq) + 2H2O(l)
, 25 cm3 of 1.00 mol dm–3 H2SO4 is reacted with excess KOH.
The energy given out is 2.8 kJ.
What is the enthalpy change of neutralisation, in kJ mol–1?
A –56
B –70
C –112
D –224
Your answer_____________ [1]
7 Which row in the table explains how a catalyst affects the activation energy (Ea) and the
proportion of molecules with energy > Ea?
How the activation Proportion of molecules
energy changes with energy > Ea
A /-decreases decreases
B /-decreases increases
C /-increases decreases
D /-increases increases
Your answer __________- [1]
8 A graph of ln(k) is plotted against 1 / T for a reaction.
(k = rate constant, T = temperature in K.)
The gradient has the numerical value of –16 000.
What is the activation energy, in kJ mol–1, for this reaction?
A +1.92
B +133
C +1920
D +133 000
Your answer____________ [1]
9 A reaction is zero order with respect to a reactant.
Which rate–concentration graph for the reactant is the correct shape?
A
