OCR A-Level Chemistry AS Breadth in chemistry (01), June 2023
Every question from OCR A-Level Chemistry AS Breadth in chemistry (01), June 2023 (H032): 26 questions, 70 marks, each with its mark scheme and topic.
- Question 1 1 mark
Explain the trend in boiling points down the halogen group in terms of intermolecular forces.
Module 3: Periodic table and energy · 3.1 The periodic table
- Question 2 1 mark
Determine the empirical formula of a hydrocarbon containing 85.71% carbon by mass.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 3 1 mark
Calculate the atom economy of hydrogen for the industrial preparation of hydrogen from methane and steam.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 4 1 mark
Identify the number of p-orbitals occupied by electrons in a sulfur atom
Module 2: Foundations in chemistry · 2.2 Electrons, bonding and structure
- Question 5 1 mark
Identify which substance has the lowest oxidation number for sulfur among four given options.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 6 1 mark
Deduce the formula of the oxide of a Period 3 element using its successive ionisation energies.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · 2.2 Electrons, bonding and structure · 3.1 The periodic table
- Question 7 1 mark
Calculate the number of oxygen atoms in 120.2 g of SiO2.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 8 1 mark
Calculate the total volume of gas produced at RTP when 0.00250 mol of magnesium nitrate is thermally decomposed.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · 2.1 Atoms and reactions · 3.1 The periodic table
- Question 9 1 mark
Calculate the mass of silver metal formed when 0.10 g of zinc reacts with 15 cm3 of 0.25 mol dm-3 aqueous silver nitrate.
Module 2: Foundations in chemistry · Practical Activity Groups · 2.1 Atoms and reactions · PAG 1: Moles determination
- Question 10 1 mark
Calculate the concentration of dilute hydrochloric acid prepared by diluting 15.00 cm3 of 18.0 mol dm-3 concentrated hydrochloric acid to 250 cm3.
Module 2: Foundations in chemistry · 2.1 Atoms and reactions
- Question 11 1 mark
Identify the correct statement or equation corresponding to the standard enthalpy change of formation of water.
Module 3: Periodic table and energy · 3.2 Physical chemistry
- Question 12 1 mark
Identify the correct statement about energy changes among four options related to combustion, bond enthalpy, activation energy, and condensation.
Module 3: Periodic table and energy · Module 4: Core organic chemistry · 3.2 Physical chemistry · 4.1 Basic concepts and hydrocarbons
- Question 13 1 mark
Identify the effect of a catalyst on the activation energy using a Boltzmann distribution curve.
Module 3: Periodic table and energy · 3.2 Physical chemistry
- Question 14 1 mark
Calculate the rate of reaction at 200 s from a concentration-time graph of hydroxide ions.
Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · Practical Activity Groups · 3.2 Physical chemistry · 5.1 Rates, equilibrium and pH · PAG 9: Rates of reaction – continuous monitoring method
- Question 15 1 mark
Identify which formula does not represent 3-methylbut-1-ene among the given options.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons
- Question 16 1 mark
Determine the number of structural isomers with the molecular formula C4H9Cl.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons · 4.2 Alcohols, haloalkanes and analysis
- Question 17 1 mark
Identify the organic product formed when 3-methylcyclohexanol is reacted with NaBr and H2SO4.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 4.2 Alcohols, haloalkanes and analysis · 6.2 Nitrogen compounds, polymers and synthesis
- Question 18 1 mark
Identify the correct intermediate compound in a two-stage synthesis from an alkene to a diol.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 4.1 Basic concepts and hydrocarbons · 4.2 Alcohols, haloalkanes and analysis · 6.2 Nitrogen compounds, polymers and synthesis
- Question 19 1 mark
Identify the organic compound that produced the given infrared spectrum from a choice of four options.
Module 6: Organic chemistry and analysis · 6.3 Analysis
- Question 20 1 mark
Identify which fragment ion with a specific m/z value would be present in the mass spectrum of only one of pentan-2-ol and pentan-3-ol.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 4.2 Alcohols, haloalkanes and analysis · 6.3 Analysis
- Question 21 7 marks
Describe covalent bonding, draw dot-and-cross diagrams, predict shapes and bond angles, and explain the shapes of NF3 and BF3 molecules.
Module 2: Foundations in chemistry · 2.2 Electrons, bonding and structure
- Question 22 11 marks
Define a strong acid, write equations for reactions involving acids and copper oxide or ammonium carbonate, and perform stoichiometric calculations and titration analysis to identify an unknown Group 1 metal.
Module 2: Foundations in chemistry · Practical Activity Groups · PAG 2: Acid-base titration · 2.1 Atoms and reactions
- Question 23 10 marks
Write the combustion equation for heptane, complete an enthalpy profile diagram for the reaction of CO and NO, explain the role of a catalyst using the diagram, state standard conditions, and calculate the standard enthalpy of formation of carbon dioxide.
Module 3: Periodic table and energy · 3.2 Physical chemistry
- Question 24 9 marks
Explain homogeneous equilibrium, apply Le Chatelier's principle to changes in pressure, temperature and catalyst for the sulfur dioxide oxidation, calculate the equilibrium constant Kc from given equilibrium concentrations, and explain the use of an excess of oxygen industrially.
Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · 3.2 Physical chemistry
- Question 25 8 marks
Explain the boiling points of butane and pentane, write propagation equations for the radical substitution of butane with bromine, and complete an organic reaction flowchart for alkenes.
Module 4: Core organic chemistry · 4.1 Basic concepts and hydrocarbons
- Question 26 5 marks
Compare the oxidation of two structural isomers of C3H8O including conditions, functional groups of products, and balanced equations.
Module 4: Core organic chemistry · 4.2 Alcohols, haloalkanes and analysis