Chemistry · May / June 2019 · Paper 11 · Question 18

Three experiments are carried out in which the same mass of magnesium is reacted with the same volume of dilute sulfuric acid at room temperature. The magnesium is in excess. experiment 1 Large pieces of magnesium are used. experiment 2 Small pieces of magnesium are used. experiment 3 Large pieces of magnesium are used but the concentration of the acid is increased. Graphs of the results are shown. [graph: volume of gas produced / cm³ against time / s, curves W, X, Y] Which row is correct? | | experiment 1 | experiment 2 | experiment 3 | |---|---|---|---| | A | W | X | Y | | B | X | Y | W | | C | Y | W | X | | D | Y | X | W |

1. AW X Y
2. BX Y W
3. CY W X
4. DY X W

As printed in the paper