AQA GCSE CHEMISTRY 8462 2H HIGHER TIER
PAPER 2 EXAM SCRIPT 2026 TESTED
QUESTIONS AND CORRECT ANSWERS
ALREADY PASSED
◉ describe the method for the experiment testing the rate of
reaction. Answer: - react hydrochloric acid with sodium thiosulphate
in a conical flask
- measure the volume of gas produced using a gas syringe on the
apparatus
- calculate rate of reaction
◉ how would a graph describe the above experiment. Answer: (time
x-axis)
(quantity y-axis)
- as time increases the volume of gas produced increases to a point
- this point shows that we have used up all the reactants in the
experiment, so the graph levels out
◉ how do u find the rate of a specific time. Answer: - draw a tangent
on the line at the specific time
- draw a triangle connected to the tangent
-calculate gradient using
,change in y/ change in x
◉ how can we increase the rate of reaction. Answer: - increase
surface area of solid reactants
- concentration of reactants
- increase pressure of gas reactants
◉ why dose the above increase the rate of the reaction. Answer: -
allow particles to collide more frequently
◉ How does increasing temperature affect the rate of reaction.
Answer: - particles move faster and collide more frequently with
more energy
◉ how dose adding a catalyst affect the rate of reaction. Answer: -
reduces the activation energy by providing a different path with less
activation energy
- they do this without being used up
◉ what is a reversible reactions. Answer: - products can return to
their original reactants and vice versa
◉ what is an example of a reversible reaction. Answer: - Harber
process
, - ammonia is formed when hydrogen and nitrogen react and it can
break down to make the original reactants
◉ how dose a reversible reaction work in a closed system. Answer: -
forward and backward reactions continuously take place
-eventually, the rate of both the forward and backward reaction
reaches equilibrium
- therefore there is no longer change in the quantity on both sides
◉ what is le chateliers principle. Answer: - if a system at equilibrium
is subjected to change, the system will counteract the change
◉ how does increasing the pressure in the Harber process affect the
raction. Answer: -position of equilibrium moves to the side that
produces fewer moles
-the rate of reaction will increase until equilibrium is reached
- reactants ( 4 moles)
-products ( 2 moles)
◉ how does increasing the concentration in the Harber process
affect the reaction. Answer: -position of equilibrium moves to the
side that produces fewer moles
PAPER 2 EXAM SCRIPT 2026 TESTED
QUESTIONS AND CORRECT ANSWERS
ALREADY PASSED
◉ describe the method for the experiment testing the rate of
reaction. Answer: - react hydrochloric acid with sodium thiosulphate
in a conical flask
- measure the volume of gas produced using a gas syringe on the
apparatus
- calculate rate of reaction
◉ how would a graph describe the above experiment. Answer: (time
x-axis)
(quantity y-axis)
- as time increases the volume of gas produced increases to a point
- this point shows that we have used up all the reactants in the
experiment, so the graph levels out
◉ how do u find the rate of a specific time. Answer: - draw a tangent
on the line at the specific time
- draw a triangle connected to the tangent
-calculate gradient using
,change in y/ change in x
◉ how can we increase the rate of reaction. Answer: - increase
surface area of solid reactants
- concentration of reactants
- increase pressure of gas reactants
◉ why dose the above increase the rate of the reaction. Answer: -
allow particles to collide more frequently
◉ How does increasing temperature affect the rate of reaction.
Answer: - particles move faster and collide more frequently with
more energy
◉ how dose adding a catalyst affect the rate of reaction. Answer: -
reduces the activation energy by providing a different path with less
activation energy
- they do this without being used up
◉ what is a reversible reactions. Answer: - products can return to
their original reactants and vice versa
◉ what is an example of a reversible reaction. Answer: - Harber
process
, - ammonia is formed when hydrogen and nitrogen react and it can
break down to make the original reactants
◉ how dose a reversible reaction work in a closed system. Answer: -
forward and backward reactions continuously take place
-eventually, the rate of both the forward and backward reaction
reaches equilibrium
- therefore there is no longer change in the quantity on both sides
◉ what is le chateliers principle. Answer: - if a system at equilibrium
is subjected to change, the system will counteract the change
◉ how does increasing the pressure in the Harber process affect the
raction. Answer: -position of equilibrium moves to the side that
produces fewer moles
-the rate of reaction will increase until equilibrium is reached
- reactants ( 4 moles)
-products ( 2 moles)
◉ how does increasing the concentration in the Harber process
affect the reaction. Answer: -position of equilibrium moves to the
side that produces fewer moles
