Catalysts and Potential Energy Diagrams

The video tutorial explains how a catalyst affects a potential energy diagram. It starts with a one-step reaction with high activation energy and describes how a catalyst changes the mechanism, lowering the activation energy. The tutorial instructs viewers to draw energy diagrams with smaller humps, emphasizing that catalysts create multi-step reactions. The key rule is that the humps should not exceed the original activation energy. The video concludes by highlighting that catalysts make reactions more favorable by reducing the energy required, thus speeding up the process.

What is the primary effect of a catalyst on a potential energy diagram?

• It increases the activation energy.

• It decreases the activation energy.

• It changes the products.

• It changes the reactants.

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

• To increase the temperature of the reaction.

• To decrease the temperature of the reaction.

• To slow down the reaction by increasing activation energy.

• To speed up the reaction by lowering activation energy.

How does a catalyst affect the reaction mechanism?

• It changes the products of the reaction.

• It has no effect on the reaction mechanism.

• It simplifies the reaction mechanism.

• It makes the reaction mechanism more complex.

When drawing a potential energy diagram with a catalyst, what is a key feature to include?

• Only one hump.

• At least two humps.

• No humps.

• A higher hump than the original.

In a catalyst-influenced reaction, what must happen first?

• The catalyst must react with the environment.

• The reactants must react with the catalyst.

• The products must react with the catalyst.

• The catalyst must be removed.

Why must the humps in a catalyst-influenced potential energy diagram not exceed the original hump's height?

• To ensure the activation energy is not increased.

• To change the products.

• To make the diagram more complex.

• To change the reactants.

What is the main reason for including multiple humps in a catalyst potential energy diagram?

• To demonstrate the change in reactants.

• To illustrate the change in products.

• To indicate a decrease in reaction speed.

• To show the increased complexity of the reaction.

Why is it important that the humps in a catalyst potential energy diagram are not higher than the original?

• To increase the activation energy.

• To make the diagram more visually appealing.

• To ensure the catalyst is effective.

• To change the products of the reaction.

What happens to the energy requirement of a reaction when a catalyst is used?

• The energy requirement increases.

• The energy requirement decreases.

• The energy requirement becomes unpredictable.

• The energy requirement remains the same.

What is the ultimate effect of a catalyst on a chemical reaction?

• It has no effect on the reaction.

• It makes the reaction less favorable.

• It stops the reaction.

• It makes the reaction more favorable.