CIE iGCSE Co-Ordinated Science C6.2 Rate of reaction Exam Style Questions Paper 1
Question
When solid pieces of calcium carbonate are added to dilute hydrochloric acid in a flask, carbon dioxide gas is given off.
The mass of the flask and its contents are measured over time.
Two different experiments are carried out. In both experiments the acid is in excess.
The results of these two experiments are shown.
Which statement explains the different shapes of the curves?
A Experiment 2 uses a catalyst.
B Experiment 2 uses acid at a higher temperature.
C Experiment 2 uses acid that is more dilute.
D Experiment 2 uses powdered calcium carbonate.
▶️Answer/Explanation
Ans :A
Question
A fixed mass of a solid is reacted with a liquid.
The volume of gas given off from the reaction over time is shown by line S.
Which change to the reaction conditions produces line T on the graph?
A increasing the amount of catalyst added
B increasing the concentration of the liquid
C increasing the particle size of the solid
D increasing the temperature of the reaction
▶️Answer/Explanation
Ans :C
Question
A chemical reaction produces a gas.
The volume of gas given off over time is measured.
The results are shown.
During which time period is the rate of reaction greatest?
(A) 0–10 seconds
(B) 20–30 seconds
(C) 40–50 seconds
(D) 60–70 seconds
▶️Answer/Explanation
Ans: A
Question
Two separate experiments X and Y are used to investigate the rate of the reaction between equal
masses of calcium carbonate and excess dilute hydrochloric acid.
The volume of carbon dioxide given off is measured over time.
A graph of the results is shown.
Which statement explains the difference between experiments X and Y?
(A) A catalyst is added to Y.
(B) A higher temperature is used in Y.
(C) Larger pieces of calcium carbonate are used in X.
(D) The acid is more concentrated in X.
▶️Answer/Explanation
Ans: D