Equal masses of zinc, prepared as powder, sixteen small pieces, four large pieces or one lump, are added to separate samples of hydrochloric acid. Each acid sample has the same volume and concentration, and each experiment is at 20 ∘C20\,^{\circ}\mathrm{C}20∘C.
Which sample of zinc reacts fastest?
Zinc in four large pieces.
Zinc in one lump.
Zinc in sixteen small pieces.
Zinc powder.
122 exam-style questions on Edexcel GCSE Chemistry 8.1 Rates of reaction, covering 8.1.1 Measuring and interpreting rates of reaction, 8.1.2 Collision theory and the factors affecting rate, and 8.1.3 Catalysts and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.