Exothermic and Endothermic Reactions in Chemistry Explained

The video tutorial explains the concepts of exothermic and endothermic reactions. Exothermic reactions release heat, as seen in the reaction of calcium oxide with water, combustion of methane, respiration, and composting. Endothermic reactions absorb heat, such as the decomposition of calcium carbonate. The tutorial provides examples and explains how to write chemical equations for these reactions.

What is the main characteristic of an exothermic reaction?

• It produces electricity.

• It absorbs heat.

• It releases heat.

• It requires light.

In the reaction of calcium oxide with water, what is formed?

• Methane

• Calcium carbonate

• Calcium hydroxide

• Carbon dioxide

Which gas is primarily involved in the combustion of natural gas?

• Oxygen

• Carbon dioxide

• Nitrogen

• Hydrogen

How is heat represented in the chemical equation of an exothermic reaction?

• As a reactant

• As a product

• As a solvent

• As a catalyst

What is the chemical formula for methane?

• CH3

• CH4

• C2H6

• C3H8

Why is respiration considered an exothermic reaction?

• It releases energy in the form of heat.

• It produces glucose.

• It absorbs oxygen.

• It requires sunlight.

What happens during the decomposition of vegetable matter into compost?

• Heat is absorbed.

• Heat is released.

• Electricity is generated.

• Light is emitted.

What is a key feature of endothermic reactions?

• They produce light.

• They absorb heat.

• They generate sound.

• They release heat.

What type of energy is required for decomposition reactions?

• Sound

• Heat, light, or electricity

• Magnetic

• Nuclear

In the decomposition of calcium carbonate, what are the products?

• Calcium carbonate and methane

• Calcium hydroxide and oxygen

• Calcium oxide and carbon dioxide

• Calcium oxide and water