Chemical Equilibrium Reaction Rate Quiz

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What is the general role of a catalyst in a reaction?

Changes the equilibrium position

Initiates the reaction

Speeds up a reaction already in progress (correct)

Halts the reaction completely

How does a catalyst affect the final position of equilibrium in a reversible reaction?

Hinders the establishment of equilibrium

Shifts the equilibrium position to the left

Shortens the time to establish equilibrium but does not affect the equilibrium position (correct)

Shifts the equilibrium position to the right

Why do some reactions require a catalyst to start?

Because reactants lack minimum kinetic energies for successful collisions (correct)

To speed up an already fast reaction

To provide energy for the reaction

To change the equilibrium position

Which of the following statements about catalysts is FALSE?

Catalysts slow down reactions Signup and view all the answers

In the absence of a catalyst, what happens to reacting molecules during collisions?

They rebound from collisions without reacting Signup and view all the answers

What is the effect of a catalyst on reversible reactions?

Accelerates both forward and reverse reactions equally without changing equilibrium position Signup and view all the answers

What is the primary role of a catalyst in a chemical reaction?

To increase the rate of the forward and reverse reactions equally Signup and view all the answers

In the Haber process for ammonia synthesis, how does the iron catalyst affect the reaction?

It shortens the time required to reach equilibrium Signup and view all the answers

If a catalyst accelerates the forward reaction more than the reverse reaction, what would be the consequence?

The system would violate the conservation of energy principle Signup and view all the answers

For a reversible reaction at equilibrium, what can be said about the rates of the forward and reverse reactions?

The forward and reverse reaction rates are equal but non-zero Signup and view all the answers

Why does the rate of a reaction decrease as it approaches equilibrium?

Both the reactants and products oppose further reaction progress Signup and view all the answers

According to the energy considerations discussed, what statement is true about catalysts?

Catalysts remain unchanged in mass and composition after the reaction Signup and view all the answers

What is the effect of a rise in temperature on the catalytic activity of a catalyst?

The catalytic activity may increase up to a certain point and then decrease. Signup and view all the answers

What is the purpose of adding a promoter to a catalyst?

To increase the catalytic activity. Signup and view all the answers

How does the addition of a promoter affect the rate of a catalytic reaction?

It increases the rate of the reaction. Signup and view all the answers

What is the relationship between temperature and the rate of a catalytic reaction according to the text?

The rate of the reaction increases up to a certain point (the optimum temperature) and then decreases. Signup and view all the answers

How does the addition of a catalyst affect the equilibrium of a reversible reaction?

It has no effect on the equilibrium position. Signup and view all the answers

What is the purpose of using a mixture of catalysts in a chemical reaction?

To obtain the maximum catalytic efficiency. Signup and view all the answers

Chemical Equilibrium Reaction Rate Quiz

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