AQA GCSE COMBINED SCIENCE: TRILOGY
8464/C/2H HIGHER TIER CHEMISTRY
PAPER 2H PAPER & MARK SCHEME
ACTUAL EXAM PAPER 2026 QUESTIONS
WITH ANSWERS GRADED A+
◍ producers of methane.
Answer: rice paddy fields and cattle
◍ problem with many things humans use in everyday life.
Answer: made from limited raw materials, and the energy used to process
these comes from limited resources
◍ crystallisation.
Answer: evaporating a solution to a small volume and leaving it to cool to
form crystals
◍ HT What happens to an equilibrium if any of the conditions change?.
Answer: The system responds to counteract the change
◍ intermolecular forces are also known as.
Answer: crosslinks
◍ HT What affect will changing the concentration of one of the reactants in a
reversible reaction have on the equilibrium?.
Answer: The system will no longer be in equilibrium and the concentration
of all the substances will change until equilibrium is reached again
◍ endothermic reaction.
Answer: takes energy in from the surroundings, surrounding temperature
decreases, reactant energy less than product energy, negative energy change,
, energy absorbed, more heat energy taken in to break bonds than was
released to form bonds
◍ HT What affects the relative amount of all the reactants and products at
equilibrium in a reversible reaction?.
Answer: The conditions
◍ fractions of crude oil: gasoline.
Answer: highly flammable, low viscosity, colourless, a.k.a. petrol, used as
car fuel
◍ how carbon dioxide levels in the atmosphere decreased.
Answer: oceans formed and carbon dioxide dissolved in them and the
precipitates of carbonates formed sediments; photosynthesis by plants and
algae; some locked up in sedimentary rocks and fossil fuels
◍ effects of temperature increase in an exothermic reaction in equilibrium.
Answer: relative amount of product decreases
◍ HT Describe the phytomining process of copper extraction.
Answer: Plants are used to absorb metal compounds, harvested and burnt to
produce ash that contains the metal compounds
◍ HT What does Le Chatelier's principle predict?.
Answer: The effects of changing conditions on a system at equilibrium
◍ HT What happens when the concentration of a product is decreased in a
reversible reaction?.
Answer: More reactant will react until equilibrium is reached again
◍ HT What happens in gaseous reactions when the pressure of a system in
equilibrium is increased?.
Answer: The equilibrium position shifts towards the side with the smaller
number of molecules as shown by the symbol equation for the reaction
◍ How can you test for an alkene?.
Answer: React is with bromine water
◍ HT What are the advantages of extracting copper using phytomining or
, bioleaching?.
Answer: These methods avoid traditional mining methods of digging,
moving and disposing of large amounts of rock
◍ saturated.
Answer: no C=C bonds
◍ processes to make energy and materials.
Answer: finite resources involve...
◍ what is affected by reaction conditions at equilibrium.
Answer: relative amounts of reactants and products
◍ HT What happens when the concentration of a reactant is increased in a
reversible reaction?.
Answer: More products will be formed until equilibrium is reached again
◍ HT What happens in gaseous reactions when the pressure of a system in
equilibrium is decreased?.
Answer: The equilibrium position shifts towards the side with the larger
number of molecules as shown by the symbol equation for the reaction
◍ anode.
Answer: positive electrode
◍ how carbon footprint works.
Answer: calculates all the greenhouse gases involved and measures them in
units of carbon dioxide
◍ HT Describe the bioleaching process of copper extraction.
Answer: Bacteria are used to produce leachate solutions that contain metal
compounds
◍ What is the symbol equation for photosynthesis?.
Answer: 6CO2 + 6O2 -->C6H12O6 + 6O2
◍ HT Name two ways of extracting copper from low-grade ores.
Answer: Phytomining and bioleaching
, ◍ effect of burning of fossil fuels with sulphur impurities.
Answer: the sulphur is oxidised to form sulphur dioxide, which causes
human respiratory problems and dissolves in water to form acid rain
◍ How can you change the direction of a reversible reaction?.
Answer: By changing the conditions; foe example heating or cooling the
reaction
◍ HT How is copper obtained from the products of phytomining or
bioleaching?.
Answer: By displacement of copper from solutions of copper compounds
using scrap iron or electrolysis
◍ HT What happens when the temperature of a system in equilibrium is
decreased?.
Answer: The relative amount of products at equilibrium decreases for an
endothermic reaction OR The relative amount of products at equilibrium
increases for an exothermic reaction
◍ HT What happens when the temperature of a system in equilibrium is
increased?.
Answer: The relative amount of products at equilibrium increases for an
endothermic reaction OR The relative amount of products at equilibrium
decreases for an exothermic reaction
◍ reduction.
Answer: gain of electrons
◍ reduction.
Answer: losing oxygen or gaining electrons
◍ units for volume of products/reactants.
Answer: cm³
◍ pure substance.
Answer: single element, compound or substance not mixed with another
substance
8464/C/2H HIGHER TIER CHEMISTRY
PAPER 2H PAPER & MARK SCHEME
ACTUAL EXAM PAPER 2026 QUESTIONS
WITH ANSWERS GRADED A+
◍ producers of methane.
Answer: rice paddy fields and cattle
◍ problem with many things humans use in everyday life.
Answer: made from limited raw materials, and the energy used to process
these comes from limited resources
◍ crystallisation.
Answer: evaporating a solution to a small volume and leaving it to cool to
form crystals
◍ HT What happens to an equilibrium if any of the conditions change?.
Answer: The system responds to counteract the change
◍ intermolecular forces are also known as.
Answer: crosslinks
◍ HT What affect will changing the concentration of one of the reactants in a
reversible reaction have on the equilibrium?.
Answer: The system will no longer be in equilibrium and the concentration
of all the substances will change until equilibrium is reached again
◍ endothermic reaction.
Answer: takes energy in from the surroundings, surrounding temperature
decreases, reactant energy less than product energy, negative energy change,
, energy absorbed, more heat energy taken in to break bonds than was
released to form bonds
◍ HT What affects the relative amount of all the reactants and products at
equilibrium in a reversible reaction?.
Answer: The conditions
◍ fractions of crude oil: gasoline.
Answer: highly flammable, low viscosity, colourless, a.k.a. petrol, used as
car fuel
◍ how carbon dioxide levels in the atmosphere decreased.
Answer: oceans formed and carbon dioxide dissolved in them and the
precipitates of carbonates formed sediments; photosynthesis by plants and
algae; some locked up in sedimentary rocks and fossil fuels
◍ effects of temperature increase in an exothermic reaction in equilibrium.
Answer: relative amount of product decreases
◍ HT Describe the phytomining process of copper extraction.
Answer: Plants are used to absorb metal compounds, harvested and burnt to
produce ash that contains the metal compounds
◍ HT What does Le Chatelier's principle predict?.
Answer: The effects of changing conditions on a system at equilibrium
◍ HT What happens when the concentration of a product is decreased in a
reversible reaction?.
Answer: More reactant will react until equilibrium is reached again
◍ HT What happens in gaseous reactions when the pressure of a system in
equilibrium is increased?.
Answer: The equilibrium position shifts towards the side with the smaller
number of molecules as shown by the symbol equation for the reaction
◍ How can you test for an alkene?.
Answer: React is with bromine water
◍ HT What are the advantages of extracting copper using phytomining or
, bioleaching?.
Answer: These methods avoid traditional mining methods of digging,
moving and disposing of large amounts of rock
◍ saturated.
Answer: no C=C bonds
◍ processes to make energy and materials.
Answer: finite resources involve...
◍ what is affected by reaction conditions at equilibrium.
Answer: relative amounts of reactants and products
◍ HT What happens when the concentration of a reactant is increased in a
reversible reaction?.
Answer: More products will be formed until equilibrium is reached again
◍ HT What happens in gaseous reactions when the pressure of a system in
equilibrium is decreased?.
Answer: The equilibrium position shifts towards the side with the larger
number of molecules as shown by the symbol equation for the reaction
◍ anode.
Answer: positive electrode
◍ how carbon footprint works.
Answer: calculates all the greenhouse gases involved and measures them in
units of carbon dioxide
◍ HT Describe the bioleaching process of copper extraction.
Answer: Bacteria are used to produce leachate solutions that contain metal
compounds
◍ What is the symbol equation for photosynthesis?.
Answer: 6CO2 + 6O2 -->C6H12O6 + 6O2
◍ HT Name two ways of extracting copper from low-grade ores.
Answer: Phytomining and bioleaching
, ◍ effect of burning of fossil fuels with sulphur impurities.
Answer: the sulphur is oxidised to form sulphur dioxide, which causes
human respiratory problems and dissolves in water to form acid rain
◍ How can you change the direction of a reversible reaction?.
Answer: By changing the conditions; foe example heating or cooling the
reaction
◍ HT How is copper obtained from the products of phytomining or
bioleaching?.
Answer: By displacement of copper from solutions of copper compounds
using scrap iron or electrolysis
◍ HT What happens when the temperature of a system in equilibrium is
decreased?.
Answer: The relative amount of products at equilibrium decreases for an
endothermic reaction OR The relative amount of products at equilibrium
increases for an exothermic reaction
◍ HT What happens when the temperature of a system in equilibrium is
increased?.
Answer: The relative amount of products at equilibrium increases for an
endothermic reaction OR The relative amount of products at equilibrium
decreases for an exothermic reaction
◍ reduction.
Answer: gain of electrons
◍ reduction.
Answer: losing oxygen or gaining electrons
◍ units for volume of products/reactants.
Answer: cm³
◍ pure substance.
Answer: single element, compound or substance not mixed with another
substance
