Catalysts and Activation Energy

A catalyst increases the efficiency of collisions between reactants.

• true

• false

Tags

NGSS.HS-PS1-5

Which of the following is used as a catalyst in the haber process?

• V₂O₅

• Fe

• Ag₂O

• SO₃

Which one of the following is not an example for heterogenous catalysis?

• Hydrogenation of oil

• Manufacture of ammonia by Haber's process

• Manufacture of sulphuric acid by Contact process

• Hydrolysis of sucrose in presence of dilute hydrochloric acid

A catalyst be regenerated or used again and again

• False

• True

The catalyst alters the rate of a chemical reaction by,

• providing an alternative pathway with a lower Ea

• changing the products formed in the direction of the reaction

• providing a surface on which the molecules react

• increasing the frequencies of collisions between molecules

Catalysts permit reactions to happen with a __________ activiation energy.

• lower

• higher

Which of the following statements about the catalyst is true?

• A catalyst accelerates the rate of reaction by bringing down the activation energy.

• A catalyst does not participate in reaction mechanism.

• A catalyst makes the reaction feasible by making ∆G more negative.

• A catalyst makes equilibrium constant more favorable for forward reaction.

An addition of a catalyst to the following reaction would have what effect?

• A would be increased

• B would be increased

• C would be decreased

• No change

Tags

NGSS.HS-PS1-5

Which of the following are true of reaction rates?

• II+III+IV

• I+IV

• II + III

• I+II+III

Tags

NGSS.HS-PS1-5

What letter represents the activation energy?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4