Lesson plan

Heat and Rates of Reaction

Use light sticks and dry ice for a dramatic lesson on rates of reaction and how they change with heat.
Science content
Chemistry: States of Matter, Properties of Materials (K-7)
Chemistry: Chemical Changes (2, 7)
Physics: Heat (3)

Compare how brightly light sticks glow when dipped in hot and cold water, and discuss rates of this chemical reaction.
Observe the dramatic reaction of dry ice turning to gas as it is added to warm water.
Add detergent to make dry ice bubbles.

Review the chemistry of the lesson:
The light sticks glow because a chemical reaction makes a new glowing molecule. The rate of this chemical reaction can be sped up by dipping the light stick in warm water, or slowed down by dipping in cold water.
Dry ice sublimes at room temperature, making clouds of carbon dioxide gas in the air, and violently bubbles as the gas is rapidly formed in warm water.

Grades taught
Gr 2
Gr 3