List two observations that could be evidence of a chemical reaction.

Question

Raquel Norton

Chemistry

15 August, 14:47

List two observations that could be evidence of a chemical reaction.

+2

Answers (2)

Know the Answer?

Paulina Cowan · Answer 1

Emission of heat or light, or a color change.

Brynlee Carter · Answer 2

1) Smell or odour

2) Colour change

Explanation:

1) Smell or odour

Example: Add HCl to a FeS solution. There will be a strong odor of H2S

2) Colour change

Example : NaOH and KMnO4 solution to a river water sample. There will be a colour change to brown.