Catalysts and Activation Energy

What are catalysts?

• Substances that increase the rate of a chemical reaction without being consumed

• Substances that have no effect on the rate of a chemical reaction

• Substances that are consumed during a chemical reaction

• Substances that decrease the rate of a chemical reaction without being consumed

Tags

NGSS.HS-PS1-5

Name two types of catalysts.

• enzymatic catalysts

• acid catalysts

• homogeneous catalysts and heterogeneous catalysts

• base catalysts

What is the role of catalysts in chemical reactions?

• Catalysts decrease the rate of chemical reactions by increasing the activation energy.

• Catalysts have no effect on the rate of chemical reactions.

• Catalysts change the products of chemical reactions.

• Catalysts increase the rate of chemical reactions by lowering the activation energy.

Tags

NGSS.HS-PS1-5

How do catalysts affect the rate of a chemical reaction?

• Catalysts increase the activation energy

• Catalysts have no effect on the activation energy

• Catalysts increase the rate of a chemical reaction

• Catalysts lower the activation energy

Tags

NGSS.HS-PS1-5

What factors can affect the activity of a catalyst?

• Volume, color, density

• Pressure, pH level, time

• Temperature, concentration of reactants, surface area, presence of inhibitors or poisons

• Speed, viscosity, solubility

Tags

NGSS.HS-PS1-5

Define activation energy.

• Minimum amount of energy required for a chemical reaction to occur

• The total amount of energy required for a chemical reaction to occur

• The average amount of energy required for a chemical reaction to occur

• The maximum amount of energy required for a chemical reaction to occur

How does activation energy relate to the rate of a chemical reaction?

• Activation energy has no effect on the rate of a chemical reaction.

• The rate of a chemical reaction is inversely proportional to the activation energy.

• Activation energy only affects the equilibrium constant of a chemical reaction.

• Activation energy determines the rate of a chemical reaction.

Explain how catalysts lower the activation energy of a reaction.

• Catalysts have no effect on the activation energy of a reaction.

• Catalysts provide an alternative reaction pathway with a lower energy barrier.

• Catalysts increase the activation energy of a reaction.

• Catalysts speed up the reaction by increasing the energy barrier.

What is the relationship between catalysts and activation energy?

• Catalysts have no effect on the activation energy.

• Catalysts increase the activation energy.

• Catalysts lower the activation energy.

• Catalysts convert activation energy into potential energy.

Why are catalysts important in industrial processes?

• They slow down chemical reactions without being consumed.

• They have no effect on chemical reactions.

• They are only used in laboratory experiments.

• They speed up chemical reactions without being consumed.

Tags

NGSS.HS-PS1-5