A liquid X reacts with solid Y to form a gas.

Which two diagrams show suitable methods for investigating the rate (speed) of the reaction?

The results of two separate reactions between excess calcium carbonate and hydrochloric acid

are shown.

Which statement explains the differences between the reactions?

Magnesium is reacted with a dilute acid.

The hydrogen gas is collected and its volume measured.

The results are shown on the graph.

Between which times was the reaction fastest?

The effect of temperature on the rate of the reaction between marble chips and hydrochloric acid

can be investigated by measuring the production of carbon dioxide.

Which item of equipment is not required for the investigation?

The diagram shows four experiments in which equal volumes of aqueous acid (all in an excess)

are added to equal masses of metal. Both acids have the same concentration.

In which experiment has the metal completely reacted in the shortest time?

The diagram shows apparatus being used to demonstrate how the rate of a chemical reaction

changes with temperature.

Which statement must be correct?

Which of the following changes decreases the rate of the reaction between magnesium and dilute

hydrochloric acid?

1 diluting the acid

2 using larger pieces of magnesium

3 cooling the mixture