Catalysts and Their Types

The video tutorial explains how catalysts speed up reactions by lowering activation energy. It covers enzymes as biological catalysts, detailing the enzyme-substrate interaction and the induced fit model. The video also discusses homogeneous catalysts, using the hydrolysis of sucrose as an example, and heterogeneous catalysts, illustrated by the hydrogenation of ethene using platinum.

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

• It changes the products of the reaction.

• It decreases the activation energy.

• It increases the activation energy.

• It slows down the reaction.

What is the active site of an enzyme?

• The part of the enzyme that changes the substrate into a different enzyme.

• The part of the enzyme that is destroyed after the reaction.

• The part of the enzyme that is inactive.

• The part of the enzyme that binds to the substrate.

What model describes the enzyme-substrate interaction?

• Lock and Key Model

• Substrate Model

• Induced Fit Model

• Active Site Model

How do non-covalent interactions affect enzyme catalysis?

• They make the reaction slower.

• They increase the activation energy.

• They change the enzyme's structure permanently.

• They help in reaching the transition state more easily.

What is a homogeneous catalyst?

• A catalyst that does not participate in the reaction.

• A catalyst that is solid.

• A catalyst in the same phase as the reactants.

• A catalyst in a different phase than the reactants.

What role do hydronium ions play in sucrose hydrolysis?

• They act as a source of neutrons.

• They act as a source of oxygen.

• They act as a source of protons.

• They act as a source of electrons.

Why is honey sweeter than table sugar?

• Because it contains more water.

• Because it contains more glucose.

• Because it contains more sucrose.

• Because it contains more fructose.

What is a heterogeneous catalyst?

• A catalyst in the same phase as the reactants.

• A catalyst that is liquid.

• A catalyst that is not involved in the reaction.

• A catalyst in a different phase than the reactants.

In the hydrogenation of ethene, what role does platinum play?

• It acts as a reactant.

• It acts as a homogeneous catalyst.

• It acts as a heterogeneous catalyst.

• It acts as a product.

What happens to hydrogen atoms during the hydrogenation of ethene?

• They form a new compound with platinum.

• They are adsorbed onto the platinum surface.

• They are released as gas.

• They remain unreacted.