Catalysts are not “used up” in chemical reactions.Group of answer choicesFalseTrue

Statement Analysis

The statement "Catalysts are not 'used up' in chemical reactions" is generally true.

Explanation

1. Definition of a Catalyst: A catalyst is a substance that increases the rate of a chemical reaction without being consumed or permanently altered by the reaction. It facilitates the reaction by lowering the activation energy required for the reaction to proceed.

2. Function in Reactions: During a reaction, a catalyst may undergo temporary changes and formation of intermediate species, but it ultimately returns to its original state after the reaction is complete. This characteristic is what differentiates catalysts from reactants, which are consumed during the reaction.

3. Importance in Chemistry: Catalysts are crucial in both industrial processes and biological systems (like enzymes) because they allow reactions to occur more efficiently and at lower temperatures.

Conclusion

Therefore, the correct answer to the statement regarding catalysts is True. They are not "used up" in chemical reactions.