Lesson plan

Making gases

Produce gas with different chemical reactions.
Science content
Chemistry: States of Matter, Properties of Materials (K-7)
Chemistry: Physical Changes, Solutions, Mixtures and Separating (2, 4, 5, 6)
Chemistry: Chemical Changes (2, 7)

Explore some chemistry of making foams (and small explosions).

First try acid-base reactions that make gases:
1. Mix vinegar and baking soda to make carbon dioxide gas
2. Add Alka seltza tablets to water
Chemical reaction: HCO3 + H -> CO2 + H2O
The Alka seltza reaction can be sealed in a film canister, to make the lid blow off as the gas pressure rises.
(also see ideas in Chemical reactions with baking soda lesson)

Then break down hydrogen peroxide to make gas:
3. Elephant's toothpaste
2H2O2 -> O2 + 2H2O

Then make a fountain as gas rapidly comes out of solution.
4. Coke and mentos activity

Grades taught
Gr K
Gr 1
Gr 3
Gr 4
Gr 5