Reaction Rates
29 past-paper questions on Reaction Rates · examined 2020–2025.
20258 questions
Which change increases the rate of a chemical reaction?
Which change increases the rate of a chemical reaction?
In two separate experiments, 1 and 2, an excess of powdered calcium carbonate reacts in a flask with dilute hydrochloric acid. Which graphs show the results of these two experiments?
In two separate experiments, 1 and 2, an excess of powdered calcium carbonate reacts in a flask with dilute hydrochloric acid. Which graphs show the results of these two experiments?
Aqueous sodium thiosulfate reacts with hydrochloric acid. The rate of the reaction increases if the concentration of both reactants is increased. Nitrogen gas reacts with hydrogen gas. The rate of the reaction increases if the pressure in the reaction vessel is increased. Which row correctly explains why the given change increases the rate of the reaction?
Magnesium reacts with dilute sulfuric acid. Two experiments are carried out at 25 °C. During each experiment, the volume of hydrogen produced is measured at regular time intervals. The results are plotted on a graph. Which graph is correct?
State and explain the effect of increasing the temperature on the rate of this reaction.
State and explain the effect of decreasing the pressure on the rate of this reaction.
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