AQA GCSE Combined Science: Trilogy Chemistry Paper 1 (Higher), 2023
Every question from AQA GCSE Combined Science: Trilogy Chemistry Paper 1 (Higher), 2023: 7 questions, 70 marks, each with its mark scheme and topic.
- Question 1 12 marks
Multi-part question about carbon dioxide: why dissolved CO2 makes water acidic, name an indicator and expected result, interpret a solubility vs temperature graph and pH change with temperature, identify the state symbol in a carbonate + HCl equation, and describe a method to measure CO2 volume produced when varying masses of calcium carbonate react with hydrochloric acid.
Chemistry · Required Practicals · C4: Chemical Changes · C8: Chemical Analysis
- Question 2 10 marks
Identify the type of reaction between lithium hydroxide and sulfuric acid, calculate Mr of H2SO4, calculate percentage by mass of oxygen in Li2SO4 to 2 s.f., and calculate concentration in g/dm3 of 0.30 g solute in 25 cm3 solution.
Chemistry · C3: Quantitative Chemistry · C4: Chemical Changes
- Question 3 9 marks
Series of short questions about sodium reacting with oxygen: balance the equation, explain electron transfer to form sodium oxide, give observations when sodium burns in oxygen, and state differences if potassium is used instead.
Chemistry · C1: Atomic Structure and the Periodic Table · C3: Quantitative Chemistry · C4: Chemical Changes · C8: Chemical Analysis
- Question 4 10 marks
Various GCSE chemistry questions on atomic structure: order of discovery of electron/proton/neutron, mass ratio of proton to electron, neutrons in bromine-81, electrons in a bromide ion, relative atomic mass of chlorine from isotopic abundances, and a dot-and-cross diagram for Cl2.
Chemistry · C1: Atomic Structure and the Periodic Table
- Question 5 9 marks
Explain and predict what happens during the electrolysis of sodium chloride solution, including why solid sodium chloride does not conduct, when it does conduct, choice of inert electrode material, the chlorine half-equation, and why hydrogen is produced and the pH increases.
Chemistry · Required Practicals · C4: Chemical Changes · C8: Chemical Analysis · Chemistry Required Practicals
- Question 6 10 marks
Describe how to obtain solid magnesium chloride from the reaction mixture; explain what happens to the magnesium atoms in the redox reaction; calculate the concentration in g/dm3 of the MgCl2 solution produced when 0.72 g Mg is added to 100 cm3 HCl (acid in excess).
Chemistry · Required Practicals · C3: Quantitative Chemistry · C4: Chemical Changes
- Question 7 10 marks
Explain structural reasons for properties of substances: identify which pair contains atoms in hexagonal rings, explain why copper conducts thermal energy, why copper oxide has a high melting point, and why water has a low melting point.
Chemistry · C2: Bonding, Structure and the Properties of Matter