Lesson plan

Sour chemistry

Predict how sour juices are by their chemical reaction with baking soda, then use sour candy in a baking soda test. Look at taste buds.
Science content
Biology: Sensing, Organ Systems (4, 5, 6)
Chemistry: States of Matter, Properties of Materials (K-7)
Chemistry: Atoms, Molecules (3-7)
Chemistry: Chemical Changes (2, 7)

Make the orange soda drink, using molecular models to figure out the chemical reaction.
Add baking soda to other juices, and correlate the amount of gas made with how many H atoms they contain.
Introduce the concept of something sour as something that has a lot of H atoms.
Students taste regular and sour skittles (or other candy) then predict and find out how many gas bubbles each will make with baking soda.
End with looking at taste buds, which detect the H atoms in sour foods.

Grades taught
Gr 4
Gr 5
Gr 6
Teaching Site
Brock Elementary