Teaching kids science can sometimes be boring. If kids can see how or why something works, it often helps them to understand the concept better. Kids enjoy doing science experiments, and the messier the experiment the better in their little minds. Doing experiments with your students or even your own children at home can increase not only their knowledge but also their love for science.
Teach kids about how pressure builds until it has to explode. This is a simple project that is best done outdoors on a nice day. This particular experiment is great for kids ages 10 to 14, however, the younger and older ones will get a kick out of it, too. Get a 2-liter bottle of soda and a package of Mentos candies. Set the bottle in an open area. Make sure everyone stands way back from the soda bottle. Open a brand new 2-liter of soda. Use a hammer and a nail to make a hole in the cap. Drop in six of the Mentos into the soda and quickly replace the cap. Move away from the bottle. Watch for the soda to shoot up in the air to form a geyser. This experiment shows kids what happens when there is too much pressure inside something. The coating on the candy reacts with the carbonation in the soda and creates air pressure and the geyser.
You can create your own fireworks in your classroom without the danger or the messy explosion. This project is good for students in middle school learning about diffusion, which is the gradual mixing of two or more substances. Get a large, clear jar that all of the students can easily see. Fill the jar about two-thirds full of water. Add 2 tbsp. of oil into a small bowl, add 8 to 10 drops of red, blue or green food coloring and mix well. Pour the oil mixture into the water. Watch for a mini-fireworks display when the food coloring separates from the oil and diffuses into the water.
Baking Soda Explosion
This is another good project for middle schoolers to do outdoors. Put 3 tsp. of baking soda in the middle of a tissue and twist the tissue closed to hold the baking soda inside. Put one-quarter cup of warm water into a plastic sandwich bag and then add 1/2 cup of vinegar. Drop the tissue and baking soda in the plastic bag and quickly close it. Sometimes it is easier to partially close the bag and then put the tissue in it. Watch as the tissue dissolves in the water and releases the baking soda. It reacts with the vinegar making carbon dioxide. The gas keeps expanding in the bag until it has nowhere else to go and creates an explosion.
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