1.3 Observing changes in matter

Question 1

Changes in matter can be —– or —-

Answer 1

physical changes or chemical changes

Question 2

what is a Physical change:

Answer 2

1. When a substance changes from one state to another

2. Physical changes are reversible

Question 3

What is a chemical change

Answer 3

1. occur when two or substances react to form a new substance
2. the new substances have different properties than the original substances

Question 4

Evidence of a chemical change

Answer 4

gas is produced, tempature changes, substance disappears, solid is formed, colour change occurs, new odour is produced.