When teaching a science class, it can be difficult to find time to include exciting science activities. Luckily, there are a few science activities that are easy and can be completed in as little as 5 minutes. Using short science activities like these will enable you to easily capture the attention of your students as you add to their knowledge base.
Students will be amazed by how colorful a CD can be when they take part in this exercise in reflecting rainbows. Hold a compact disc in the sun, and shine a flashlight against the surface. Place a piece of white paper onto a flat surface, and angle the flashlight so the reflection hits the paper. There will be a spectacular rainbow of colors on the paper reflected from the CD.
You can demonstrate the effect of salt on eggs in this quick and fascinating experiment. Fill two glasses 3/4 full of water. In one of the glasses, pour in around 6 to 8 tablespoons of table salt. Stir the solution well to incorporate the salt throughout the water. When you drop an egg into each glass of water, one egg will float, while the other egg will sink. The salty water has become heavier as a result of the addition of salt, so it will keep the egg afloat.
Baking Soda Balloon
Making a baking soda balloon is very easy and quick, and it's also quite exciting. Place a funnel inside the opening of a balloon, and pour in around 4 tablespoons of baking soda. Fill a water bottle with 1/2 cup of white vinegar. Fit the end of the balloon over the opening of the bottle, then empty the baking soda from the balloon into the bottle. The baking soda will chemically react with the vinegar to make gas, which will inflate the balloon.
Students can hide secret messages on paper by using homemade invisible ink. This quick and easy project is accomplished using only lemon juice, a paintbrush and plain white paper. Simply dip the end of the paintbrush into the lemon juice, then use it to write a message on the paper. Allow the juice to dry completely. When the paper is held up to a light, the message can be read clearly. When you take the paper away from the light, the message will seem to disappear. With invisible ink, students can take turns creating secret messages to each other.