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Activity

Milkshake: foam in food

Summary: 
Make a milkshake by blowing bubbles in milk (plus flavourings) to make a foam.
Science content (2016 curriculum): 
Chemistry: States of Matter, Properties of Materials (K-7)
Chemistry: Physical Changes, Solutions, Mixtures and Separating (2, 4, 5, 6)
Lessons activity is in: 
Materials: 
  • large cups (to contain the foam made)
  • whole milk, about one cup is plenty
  • optional: flavourings
  • straw
Procedure: 

Make a foam drink, by adding air bubbles to milk.

Give students a cup of milk and a straw (and a squirt of flavouring).
Ask them to blow bubbles in their drink to make foam, then drink their "milkshake".

The bubbles are air blown into the drink, which are stabilized by components in milk.

Optional: do the foam molecule test on the component molecules of milkshake (protein, fat, sugar), to find out which ones make the foam. (The fat and protein.)

The foam is a kind of mixture called a colloid.
See the attachment for other kinds of colloids and mixtures.

Attached documents: 
Grades taught: 
Gr 1
Gr 2
Gr 3
Gr 4
Gr 5
Teacher: 
Ingrid
Teaching site: 
General Gordon Elementary Science Club
ingridscience afterschool