Observing Change

Question 1

What is a physical change.

Answer 1

A change in which a substance undergoes a change in its physical properties

Question 2

List examples of physical changes.

Answer 2

Melting ice, melting chocolate blowing up a balloon.

Question 3

Explain what a chemical change is.

Answer 3

When a substance is changed chemically, this is usually irreversible.

Question 4

List examples of a chemical change.

Answer 4

Dissolving a tablet in water, iron oxide

Question 5

Compare physical and chemical changes. (this is on the list but not necessary)

Answer 5

In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed

Question 6

Describe the changes that occur in a chemical reaction.

Answer 6

Atoms rearrange to form a new substance. Visually however,
Colour change, temperature change, light is emitted, gas is produced