Chemistry · Oct / Nov 2025 · Paper 12 · Question 16

In two separate experiments, 1 and 2, an excess of powdered calcium carbonate reacts in a flask with dilute hydrochloric acid. In experiment 1, the volume of carbon dioxide evolved is measured at regular time intervals. In experiment 2, the mass of the flask and its contents is measured at regular time intervals. The results of both experiments are plotted on graphs. [graphs W, X, Y, Z] Which graphs show the results of these two experiments?

1. Aexperiment 1: W; experiment 2: Y
2. Bexperiment 1: W; experiment 2: Z
3. Cexperiment 1: X; experiment 2: Y
4. Dexperiment 1: X; experiment 2: Z

As printed in the paper