18 Questions
What is the general role of a catalyst in a reaction?
Speeds up a reaction already in progress
How does a catalyst affect the final position of equilibrium in a reversible reaction?
Shortens the time to establish equilibrium but does not affect the equilibrium position
Why do some reactions require a catalyst to start?
Because reactants lack minimum kinetic energies for successful collisions
Which of the following statements about catalysts is FALSE?
Catalysts slow down reactions
In the absence of a catalyst, what happens to reacting molecules during collisions?
They rebound from collisions without reacting
What is the effect of a catalyst on reversible reactions?
Accelerates both forward and reverse reactions equally without changing equilibrium position
What is the primary role of a catalyst in a chemical reaction?
To increase the rate of the forward and reverse reactions equally
In the Haber process for ammonia synthesis, how does the iron catalyst affect the reaction?
It shortens the time required to reach equilibrium
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
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
Why does the rate of a reaction decrease as it approaches equilibrium?
Both the reactants and products oppose further reaction progress
According to the energy considerations discussed, what statement is true about catalysts?
Catalysts remain unchanged in mass and composition after the reaction
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.
What is the purpose of adding a promoter to a catalyst?
To increase the catalytic activity.
How does the addition of a promoter affect the rate of a catalytic reaction?
It increases the rate of the reaction.
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.
How does the addition of a catalyst affect the equilibrium of a reversible reaction?
It has no effect on the equilibrium position.
What is the purpose of using a mixture of catalysts in a chemical reaction?
To obtain the maximum catalytic efficiency.
Test your understanding of chemical equilibrium, reaction rates, and the impact of catalysts on reaction rates. Explore how reactions progress over time and how equilibrium is established. Analyze how reverse reactions differ from forward reactions.
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