Which of the following statements is/are true of catalyst?
1. A catalyst is a substance that speeds up a reaction without being consumed itself.
2. A heterogeneous catalyst is one that is present in the same phase (physical state) as the reacting molecules.
3. A homogeneous catalyst is one that is present in a different phase (physical state) from the reacting molecules.

Question

Which of the following statements is/are true of catalyst?
1. A catalyst is a substance that speeds up a reaction without being consumed itself. 
2. A heterogeneous catalyst is one that is present in the same phase (physical state) as the reacting molecules. 
3. A homogeneous catalyst is one that is present in a different phase (physical state) from the reacting molecules.

Quizplus · Accepted Answer

1. A catalyst indeed speeds up a chemical reaction without being consumed in the process. Statement 2 is incorrect because a heterogeneous catalyst is in a different phase than the reacting molecules, not the same. Statement 3 is incorrect because a homogeneous catalyst is in the same phase as the reacting molecules.

Which of the Following Statements Is/are True of Catalyst