The rate of reaction between zinc and dilute hydrochloric acid is faster when zinc powder is used instead of zinc granules of the same mass. Why does using zinc powder increase the rate of reaction?
The zinc powder acts as a catalyst.
The zinc powder has a larger surface area.
The zinc particles move faster.
The concentration of the zinc is increased.
31 exam-style questions on OCR GCSE Chemistry Controlling reactions. Each one has a worked solution and a mark scheme showing where the marks go.