Lesson: Chapter 17 — Rate of Reaction

17.1. Catalysts and inhibitors 2 of 7 Reset answers

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Question 2

In activity 17.4, what is the mass of the manganese dioxide once it has been filtered off and dried at the end of the reaction?

A Zero — it has been used up completely B More than 0.2 g C Less than 0.2 g D Still 0.2 g

The right answer is the one marked above.

Still 0.2 g. The mass of the manganese dioxide has not changed.

The physical form of a catalyst may alter as the reaction proceeds, but no chemical change to it takes place in the end — so its mass does not change either.

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