Materials: lemons, baking soda, food coloring, knife, spoon, plates or trays, pencils, copies of the skill sheet
Overview: Kids make (or watch you demonstrate) a lemon “volcano.” Baking soda sprinked on top reacts with the acid in the lemon to create foaming “lava” that oozes down the sides. Food coloring is optional. It looks great.
Directions:
- Before the lesson, cut a lemon or lemons in half so each group of kids gets a lemon half. (Or have just one that you can demonstrate with.) For each lemon half, cut a sliver off the base so it will sit flat on a plate or tray.
- Set up workstations with a lemon half, a few teaspoons of baking soda, a spoon, and a plate. Supply food coloring if you like.
- Tell kids these “volcanoes” will erupt because the acid in lemons reacts chemically with baking soda to create a bubbly gas called carbon dioxide.
- Kids can use a spoon to loosen the insides of the lemon to free up the juice. Drop in food coloring.
- Sprinkle baking soda on each lemon half. Prod with a spoon to mix with juice. Watch it fizz!
- Record observations on the skill sheets.