Summary 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) Activities in this lesson Soda drink Sour candy chemistry Taste bud observation Procedure 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, OR add baking soda to skittles and predict which ones are the sour skittles (make the most bubbles). End with looking at taste buds, which detect the H atoms in sour foods. Notes Brock: soda drink, test other juices, sour candy bubbling, then taste bud observation Seymour: soda drink, experimenting with different juices, then sour candy bubbling Grades taught Gr 4 Gr 5 Gr 6 Gr 7
