AQA GCSE Combined Science: Trilogy Chemistry Paper 1 (Higher), 2021
Every question from AQA GCSE Combined Science: Trilogy Chemistry Paper 1 (Higher), 2021: 7 questions, 70 marks, each with its mark scheme and topic.
- Question 1 8 marks
Answer questions on the periodic table, atomic models, isotopes, and calculate the relative atomic mass of potassium from isotope abundances.
Chemistry · C1: Atomic Structure and the Periodic Table
- Question 2 12 marks
Answer a series of questions about acids, indicators, pH, state symbols, reactions of acids with carbonates, ionic formulae, and planning a method to prepare a pure dry sample of copper chloride from hydrochloric acid and copper oxide.
Chemistry · Required Practicals · C4: Chemical Changes · C2: Bonding, Structure and the Properties of Matter · Chemistry Required Practicals
- Question 3 12 marks
Investigate and explain the temperature change when ammonium nitrate dissolves in water, identify variables and improvements, interpret a temperature-time graph, and draw an exothermic reaction profile.
Chemistry · C5: Energy Changes
- Question 4 10 marks
Answer questions on carbon structures and alloys, including Buckminsterfullerene, why graphite conducts electricity, why steel is harder than iron, and calculating the mass of iron in stainless steel from percentage composition.
Chemistry · C2: Bonding, Structure and the Properties of Matter
- Question 5 8 marks
Explain and complete half-equations for the electrolysis of aqueous sodium chloride and sodium sulfate, identifying reduction at the negative electrode and oxidation producing chlorine and oxygen at the positive electrode.
Chemistry · Required Practicals · C4: Chemical Changes · Chemistry Required Practicals
- Question 6 12 marks
Calculate masses and moles in reactions of metals with oxygen, explain the effect of using a crucible lid, and determine the formula and balanced equation for an iron oxide from mole data.
Chemistry · C3: Quantitative Chemistry · C4: Chemical Changes
- Question 7 8 marks
Explain why methane and oxygen do not react at room temperature, predict the energy released by butane combustion from a pattern, and calculate the C–C bond energy in propane combustion using bond energies.
Chemistry · C5: Energy Changes · C7: Organic Chemistry · C2: Bonding, Structure and the Properties of Matter