Question 1

Which statement best describes the role of a catalyst in a chemical reaction?

Accepted Answer

A catalyst provides an alternative pathway with lower activation energy, increasing the rate of reaction.

Question 2

Consider the following reaction: $$2H_2O_2_{(aq)} \rightarrow 2H_2O_{(l)} + O_2_{(g)}. If a $$catalyst is used, how is it typically represented in the chemical equation?

Accepted Answer

It is written above the reaction arrow to indicate its role.

Question 3

Which of the following is a reason why the chemical industry prefers heterogeneous catalysts?

Accepted Answer

They can be easily separated from products and reused.

Question 4

What is the effect of a catalyst on the activation energy ($$E_a) of a $$reaction?

Accepted Answer

It provides an alternative pathway with a lower $$E_a$$ for both forward and reverse reactions.

Question 5

Which of the following best describes an enzyme?

Accepted Answer

A highly specific protein catalyst produced by cells.

Question 6

Which of the following is an example of a heterogeneous catalyst used in car exhaust converters?

Accepted Answer

Platinum mounted on a honeycomb support

Question 7

Why do catalysts increase the probability of successful collisions between reactant particles?

Accepted Answer

They provide a lower energy pathway, so more particles have sufficient energy to react.

Question 8

Which statement is true about the use of catalysts in chemical reactions?

Accepted Answer

Catalysts promote favorable orientations of collisions between reactant molecules.

Question 9

Which of the following is NOT a property of enzymes?

Accepted Answer

Enzymes are consumed during the reaction and cannot be reused.

Question 10

Which of the following reactions occurs in a car exhaust converter to reduce air pollution?

Accepted Answer

$$2NO_{(g)} \rightarrow N_2_{(g)} + O_2_{(g)}$$

Question 11

Which of the following best describes a homogeneous catalyst?

Accepted Answer

A catalyst that is in the same physical state as the reactants and products.

Question 12

Which of the following substances is commonly used as an inorganic catalyst in chemical reactions?

Accepted Answer

Platinum

Question 13

A student claims that adding a catalyst to a reaction will increase the yield of products. Is this claim correct?

Accepted Answer

No, because catalysts only increase the rate, not the yield.

Question 14

Which of the following is a key advantage of using a catalyst in industrial chemical processes?

Accepted Answer

It allows reactions to occur at lower temperatures, saving energy.

Question 15

Which of the following is true about the specificity of enzymes?

Accepted Answer

Each enzyme typically catalyzes only one specific reaction.

Question 16

Which of the following is a correct statement about the energy profile of a catalyzed reaction?

Accepted Answer

The activation energy with a catalyst is lower than without a catalyst.

Question 17

Which of the following is a reason why enzymes are essential for life?

Accepted Answer

They allow chemical reactions to occur at rates compatible with life.

Question 18

Which of the following is NOT a typical property of inorganic catalysts?

Accepted Answer

They are highly specific and only catalyze one reaction type.

Question 19

Which of the following best explains why a catalyst is not used up during a chemical reaction?

Accepted Answer

It is regenerated at the end of the reaction cycle.

Catalysts in Organic Chemistry: Types, Mechanisms, and Applications

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