11.2 What Are The Different Types Of Chemical Changes

Question 1

What is combustion?

Answer 1

A chemical reaction in which a substance reacts with oxygen to form one or more new substances, usually releasing energy in the form of heat and light.

Example: methane + oxygen → carbon dioxide + water

Question 2

What is thermal decomposition?

Answer 2

The process in which a substance breaks down into one or more products, usually requiring heat.

Example: calcium carbonate → calcium oxide + carbon dioxide

Question 3

What is oxidation in the context of chemical changes?

Answer 3

Oxidation is a chemical change that takes place when a substance gains oxygen.

Question 4

What is an example of oxidation involving iron?

Answer 4

Rusting: Iron reacts with oxygen and water to form hydrated iron (III) oxide.

Question 5

What is the main purpose of cellular respiration?

Answer 5

To release energy from food.

Question 6

What are the reactants of cellular respiration?

Answer 6

Glucose and oxygen.

Question 7

What are the products of cellular respiration?

Answer 7

Carbon dioxide and water.

Question 8

Fill in the blank: Oxidation occurs when a substance gains _______.

Answer 8

oxygen

Question 9

True or False: Rusting of iron is an example of oxidation.

Answer 9

True