Chemistry 0620 · IGCSE · Rate of reaction

Rate of reaction — practice question

When calcium carbonate reacts with dilute hydrochloric acid, carbon dioxide gas is released. As a result, the reaction mixture loses mass. Four different experiments are carried out. For each reaction mixture, the initial mass and the mass after five minutes are measured. In which experiment is carbon dioxide produced at the highest rate?

  • Astarting mass $14.37\,\text{g}$, mass after five minutes $11.89\,\text{g}$
  • Bstarting mass $16.52\,\text{g}$, mass after five minutes $15.29\,\text{g}$
  • Cstarting mass $16.76\,\text{g}$, mass after five minutes $14.12\,\text{g}$
  • Dstarting mass $16.99\,\text{g}$, mass after five minutes $15.21\,\text{g}$

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