Summary Do two activities from the selection, to show chemical reactions. Choose food-related ones for a Chemistry of Cooking / Foods workshop. Science content Chemistry: Atoms, Molecules (3-7) Chemistry: Chemical Changes (2, 7) Activities in this lesson Elephant's toothpaste Baking soda and vinegar Rocket powered by baking soda and vinegar Soda drink Baking powder chemistry Cheese Hydrogen peroxide chemistry Carbonate precipitation Shining pennies Candle chemistry (and fossil fuel combustion) Procedure Pair two or three activities for a lesson. Include molecule models for older primaries and up. A chemical reaction happens when new molecules are made. Clues of a chemical reaction are a new colour or smell, a temperature change (the mixture makes heat or gets cold), light appearing, or a new state of matter (e.g. gas bubbles or a solid precipitating). However, these are only clues (especially a new state of matter) - we need to know the starting and ending molecules to be sure it is a chemical reaction. Examples of activity combinations: 1 Elephant's toothpaste demonstration (clues are a new state of matter and feel it getting warm). Baking soda demonstration (clues are a new state of matter and feel it getting cold). Molecular modelling of baking soda and vinegar. Rocket outside or Soda drink 2 Soda drink Molecular modelling of chemistry Rocket outside with same chemistry Cleaning pennies 3 Baking powder chemistry Molecular modelling of chemistry Rocket outside with same chemistry 4 Candle combustion (clues of light and heat) Baking soda and vinegar demo (clue of a new gas formed) then molecule models Baking soda rocket Cleaning pennies Grades taught Gr K Gr 1 Gr 2 Gr 3 Gr 4 Gr 5 Gr 6 Gr 7
