Marble chips are mainly calcium carbonate (CaCO3). A student investigated the rate of reaction between marble chips and hydrochloric acid (HCl). Figure 1 shows the apparatus the student used.Explain, in terms of particles, how and why the rate of reaction changes during the reaction of calcium carbonate with hydrochloric acid. – 6170

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1. As the reaction goes on, the acid particles get used up (or the marble/reactant gets used up).
   This means the concentration of acid decreases (or surface area of marble gets smaller).

   Because of that, there are less frequent collisions between particles (fewer collisions per second),
   so the reaction rate decreases and the reaction slows down.

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