GCE
Chemistry A
H432/01: Periodic table, elements and physical chemistry
*1349151513*
A Level 2025
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 100.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 32 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2024 [601/5255/2] DC (DE/CT) 333446/5
OCR is an exempt Charity
Turn over
SECTION A
You should spend a maximum of 20 minutes on this section.
Write your answer to each question in the box provided.
1 ↑↑ ↑↑ Oxygen has the electron configuration 1s22s22p4.
How are the electrons in an atom of oxygen arranged in the p-orbitals?
A ↑↓ ↑↓
B ↑↑ ↑ ↑
↑↓ ↑ ↑
, 2
C
D
Your answer
2 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 [1] 3 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 2 4Fe + 3O
D 2Fe2O3 + 3C 4Fe + 3CO2
Your answer
4 Which compounds of magnesium can be used as ‘antacids’?
A Chlorides
B Hydroxides
C Nitrates
© OCR 2024
, 3
D Sulfates
Your answer
5 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 [1] 6 Which equation does not represent a
disproportionation reaction?
A Cl 2 + H2O HCl O + HCl
B Cl 2 + 2NaOH NaCl O + NaCl + H2O
C 4KCl O3 KCl + 3KCl O4
D 4HCl + MnO2 MnCl 2 + Cl 2 + 2H2O
Your answer
7 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
© OCR 2024 Turn over
, 4
8 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 with
energy changes energy > Ea
A decreases decreases
B decreases increases
C increases decreases
D increases increases
Your answer [1] 9 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
10 A reaction is zero order with respect to a reactant.
Which rate–concentration graph for the reactant is the correct shape?
A
B
C
© OCR 2024
Chemistry A
H432/01: Periodic table, elements and physical chemistry
*1349151513*
A Level 2025
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 100.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 32 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2024 [601/5255/2] DC (DE/CT) 333446/5
OCR is an exempt Charity
Turn over
SECTION A
You should spend a maximum of 20 minutes on this section.
Write your answer to each question in the box provided.
1 ↑↑ ↑↑ Oxygen has the electron configuration 1s22s22p4.
How are the electrons in an atom of oxygen arranged in the p-orbitals?
A ↑↓ ↑↓
B ↑↑ ↑ ↑
↑↓ ↑ ↑
, 2
C
D
Your answer
2 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 [1] 3 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 2 4Fe + 3O
D 2Fe2O3 + 3C 4Fe + 3CO2
Your answer
4 Which compounds of magnesium can be used as ‘antacids’?
A Chlorides
B Hydroxides
C Nitrates
© OCR 2024
, 3
D Sulfates
Your answer
5 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 [1] 6 Which equation does not represent a
disproportionation reaction?
A Cl 2 + H2O HCl O + HCl
B Cl 2 + 2NaOH NaCl O + NaCl + H2O
C 4KCl O3 KCl + 3KCl O4
D 4HCl + MnO2 MnCl 2 + Cl 2 + 2H2O
Your answer
7 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
© OCR 2024 Turn over
, 4
8 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 with
energy changes energy > Ea
A decreases decreases
B decreases increases
C increases decreases
D increases increases
Your answer [1] 9 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
10 A reaction is zero order with respect to a reactant.
Which rate–concentration graph for the reactant is the correct shape?
A
B
C
© OCR 2024
