Objective
By the end of this lesson, you will be able to understand the basics of chemical reactions and conduct fun experiments to observe them in action.
Materials and Prep
- Water
- Vinegar
- Baking soda
- Cups and spoons for mixing
- Food coloring (optional)
No prior knowledge is required for this lesson, just come with a curious mind!
Activities
- Baking Soda and Vinegar Volcano: Mix baking soda and vinegar to create a bubbly eruption. Observe the chemical reaction taking place.
- Color Changing Milk: Add drops of food coloring to milk and then touch it with a cotton swab soaked in dish soap to see swirling colors due to surface tension changes.
- Invisible Ink: Use lemon juice as invisible ink and reveal the hidden message by gently heating the paper.
Talking Points
- Chemical Reactions: "Chemical reactions are like recipes. When you mix certain ingredients together, they react and create something new."
- Baking Soda and Vinegar: "When baking soda and vinegar mix, they create carbon dioxide gas, which causes the fizzing and bubbling in our volcano experiment."
- Surface Tension: "Surface tension is what allows the food coloring to stay on the surface of the milk until we disrupt it with soap, causing the colors to swirl."
- Invisible Ink: "Lemon juice is an acid that weakens the paper fibers. When heated, it oxidizes and turns brown, revealing our hidden message."