Chemical Reactions And Physical Changes: Differences Between Chemical Reactions And Physical Changes

Question 1

Chemical reactions

Answer 1

Can’t be reversed

Create a new substance

Question 2

Physical changes

Answer 2

Can be reversed

Don’t create a new chemical substance

Question 3

Suggest ways we know a chemical reaction may have taken place.

Answer 3

Colour change
Temperature change
Fizzing/bubbling (gas being made and given off)
Light energy is given out
A different solid produced
Mass change due to gas escaping