AP MCQ 05ABCDEFGHIJK PART 4

Which of the following best describes the action of a catalyst and how a reaction rate is increased when one is present?

The reaction mechanism below shows the destruction of ozone in the earth's atmosphere.

Step 1: Cl_(g) + O_3(g) → ClO_(g) + O_2(g)
Step 2: ClO_(g) + O_(g) → Cl_(g) + O_2(g)

Which species is the catalyst, and how can it by identified?

Which of the following is not a characteristic of a catalyst?

On the diagram shown below, which of the values are affected by the addition of a catalyst?

What happens when a catalyst is added to an equilibrium mixture?

A few drops of sulfuric acid are observed to increase the rate of a reaction between a liquid alcohol and a liquid carboxylic acid, whereas a transition metal catalyst does the same in the case of the production of ammonia gas from nitrogen and hydrogen gases. Which statement best describes these observations?

Based purely on a set of elementary steps that make up a reaction mechanism, how might one recognize a catalyst?

When enzymes are used to catalyze substrates in biological reactions, the rate of product formation is often found to ultimately plateau. Which explanation would NOT account for this observation?

When a reversible reaction is exposed to a catalyst, which statement correctly summarizes the change in the rate of the forward and backward reactions?

In the following mechanism, what is the catalyst?

A + B → C + D
C + A → B + D