4 marksFoundation and Higher5.9.1.4 How carbon dioxide decreased
AQA Trilogy 8464
Spec and skills
Paper scope: C2
Spec 5.9.1.4
Original practice question
Answer and supported method checks
Two laboratory ecosystem models both remove carbon dioxide by photosynthesis. In model A all dead plant material decomposes. In model B some material is buried where decomposition is very slow.
Explain which model better represents long-term carbon removal and why the amount photosynthesised alone is not enough to predict the long-term atmospheric change.
[4 marks]
4 marksFoundation and Higher5.7.1.2 Fractional distillation and petrochemicals
AQA Trilogy 8464
Spec and skills
Paper scope: C2
Spec 5.7.1.2
Original practice question
Answer and supported method checks
A student says: "Crude oil is a compound. Fractional distillation breaks its molecules into simpler hydrocarbons. Each fraction contains one pure substance."
Evaluate each part of this explanation.
[4 marks]
4 marksFoundation and Higher5.6.1.1 Calculating rates of reactions
AQA Trilogy 8464
Spec and skills
Paper scope: C2
Spec 5.6.1.1
Original practice question
Answer and supported method checks
A reaction uses the same solution concentration at 20 °C and 35 °C. A student explains the faster reaction at 35 °C by saying particles are larger and the activation energy has decreased.
Evaluate the explanation.
[4 marks]
4 marksFoundation and Higher5.8.1.3 Chromatography
AQA Trilogy 8464
Spec and skills
Paper scope: C2
Spec 5.8.1.3
Original practice question
Answer and supported method checks
In paper chromatography, dye A travels farther than dye B in the same time. Both start on the same line and the solvent front has passed both spots.
Explain the separation in terms of the mobile and stationary phases, and assess the suggestion that A must be a smaller molecule.
[4 marks]
4 marksFoundation and Higher5.10.1.1 Using the Earth's resources and sustainable development
AQA Trilogy 8464
Spec and skills
Paper scope: C2
Spec 5.10.1.1
Original practice question
Answer and supported method checks
A factory uses 240 tonnes of a finite mineral each year. Process improvements reduce annual use by 15%. A managed forest supplies a different raw material that can regrow.
.1
Calculate the factory’s new annual mineral use.
[2 marks]
.2
Explain why the mineral remains finite and why a renewable resource is not automatically sustainable.
