The 4th of July. Thoughts of parades, fireworks, BBQ’s, and hanging out by the lake might come to mind. But what about STEM? Here are some crowd-pleasing experiments to share at your next gathering (they are also a great way to keep kids thinking about science over the summer).
- Clear jar / glass,
- Small bowl
- Vegetable oil
- Food coloring
- Warm water
- Fill a clear jar ¾ of the way full with warm water.
- In a separate bowl / container, combine 3 or 4 tablespoons vegetable oil with about 15 -20 drops of food coloring (use 3-4 colors). Mix together.
- Pour the oil mixture into the jar and watch the fireworks!
How it works:
- Food coloring dissolves in water, but not oil.
- Oil is less dense than water, so the oil floats on top of the water.
- The food coloring begins to sink because it is heavier than the oil.
- When the food coloring reaches the water, it dissolves and looks like mini fireworks.
- Star-shaped ice cube tray
- Eye dropper
- Red and blue food coloring
- Baking soda, vinegar
- Glitter (optional)
- 2 cups / bowls
- Make ice cubes. Combine baking soda and water (the mix should be moldable / packable in your hands; not runny) and place in the freezer. Decorate with glitter (optional).
- Mix vinegar and red food coloring in one cup and vinegar and blue food coloring in another cup. Add glitter (optional).
- Place ice cubes on a tray and squirt them with the vinegar using eye dropper.
- Watch the reaction!
How it works:
- The fizz is produced by a chemical reaction between the baking soda and vinegar.
- When the chemical reaction occurs, carbon dioxide (a gas) is produced and it forms bubbles inside the liquid.