The difference between physical and chemical changes can be hard to spot. With these simple and easy experiments, your child can learn to differentiate the two and have a tasty treat along the way. Here’s how it works:
1. What you’ll need: The ingredients for this experiment are about as easy as it gets. You’ll need two eggs, some vinegar, and two bowls.
2. What to do:
- Experiment 1:
Crack open an egg and pour it into one of the bowls. Have your child stir it up until the yolk and egg whites have been mixed together. Ask them whether they think this is a physical change or a chemical change. (Hint: It’s a physical change. Only the form of the egg is changing, not its composition.)
- Experiment 2:
Place your second egg into a bowl. Pour vinegar into the bowl until the egg is covered. Simple enough, right? You’ll see bubbles right away and within a week, the eggshell will dissolve into the vinegar, leaving the egg exposed. Ask your child again whether they think this is a physical or chemical change. This is a little trickier, but as the acidity of the vinegar dissolves the eggshell, calcium is released and accumulates at the top. Therefore, this is technically a chemical change.
- Bonus experiment: If you want a fun and yummy experiment to cap it all off, make root beer floats! Pouring the root beer over the ice cream releases the gas in the soda and causes a build up of foam. A great and delicious example of a physical change!
Enjoy and check out the science subjects on SD Accelerate! Don’t forget to sign up for our free two month trial here.