Physical vs. Chemical Changes

Question 1

What are the two main ways a physical change can occur?

Answer 1

A substance changes from one state to another, or it is dissolved in a solution

Question 2

What happens at the atomic level during a chemical change?

Answer 2

Existing chemical bonds are broken and new bonds are formed

Question 3

What are the CEGS pieces of evidence for a chemical change?

Answer 3

Colour change (unexpected/permanent), Energy change (light/heat), Gas released, and Solid (precipitate) formed

Question 4

What three steps must happen for any chemical reaction to take place?

Answer 4

1) Reactant bonds break, 2) atoms/ions rearrange, and 3) new bonds form to create products