Elephant's Toothpaste

The video explains how catalysts can speed up chemical reactions, using the example of hydrogen peroxide breakdown in the Elephant's Toothpaste experiment. It discusses the concept of activation energy and how catalysts lower this energy, allowing more molecules to react. The video also covers the use of catalytic converters in cars to reduce harmful emissions by converting gases into less harmful substances.

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

• To increase the temperature of the reaction

• To change the color of the reactants

• To slow down the reaction

• To speed up the reaction

In the hydrogen peroxide experiment, what is the purpose of adding food coloring?

• To make the experiment visually dramatic

• To stabilize the hydrogen peroxide

• To chemically react with hydrogen peroxide

• To increase the reaction speed

What is the effect of potassium iodide in the hydrogen peroxide experiment?

• It acts as a reactant

• It slows down the reaction

• It acts as a catalyst

• It changes the color of the solution

What is activation energy in the context of chemical reactions?

• The energy required to start a reaction

• The energy released during a reaction

• The energy needed to stop a reaction

• The energy that changes the color of reactants

How do catalysts affect the activation energy of a reaction?

• They increase the activation energy

• They decrease the activation energy

• They have no effect on activation energy

• They double the activation energy

What is the purpose of catalytic converters in cars?

• To increase the speed of the car

• To reduce the noise of the engine

• To convert exhaust gases into less harmful substances

• To increase fuel efficiency

Which precious metals are commonly used in catalytic converters?

• Aluminum, Tin, and Lead

• Iron, Nickel, and Zinc

• Platinum, Palladium, and Rhodium

• Gold, Silver, and Copper