Science Experiments For Your Class
A basic science experiment is trying to mix oil and water in a container
. To do this have your class bring in clear, empty water bottles, and you can bring a jug a cooking oil. Pour about two tablespoons of water into each of their water bottles and have them fill the rest of their water bottles half-full with tap water.
Tell students to put the lid back on their water bottle and shake it up. You can explain to them the principle of density and that oil floats on top of the water because it is less dense than water.
This experiment can also teach that the molecules of one substance don't always like to mix with the molecules of other substances. The molecules that make up the oil stick together, but repel the water molecules, making them unable to mix.
Another easy experiment is to have your class blow up their own balloons with air, but the balloon to their ear, and tap lightly on the other side. Though their tapping is light, the sound they hear will be loud.
This can teach them that because the air molecules are bunched up together really tight inside of the balloon, it allows them to be a better conductor of sound waves than the air around you, because the air around you is not as closely packed together.
You can teach your class another balloon experiment, by mixing a little bit of water and baking soda inside of a water bottle. After that is mixed, quickly pour in lemon juice and put a stretched-out balloon on the mouth. of the bottle.
The balloon will inflate by itself, and you can teach your class about chemical reactions. The baking soda is a base, and the lemon juice is an acid, and when combined together they make carbon dioxide (CO2), which is the gas that inflated the balloon.
One of the most fun science experiments is with a 2-liter bottle of Diet Coke and a pack of Mentos. This experiment needs to be done outside because it is very messy. Place the open Coke bottle on the ground, and quickly drop in the entire pack of Mentos into the bottle all at once.
The combination will create a geyser of Diet Coke to explode out of the mouth of the bottle. This reaction occurs because the carbon dioxide in the soda bottle get released when the small holes in the Mentos candy are filled wit the air bubbles.
An easier, less messy experiment is to fill two glasses with water; one hot and the other cold. Make sure that the same amount of water is in both glasses. Quickly put a drop of food coloring in both glasses at the same time and watch the difference in the water.
Your class will see that the food coloring in the hot water spreads faster that the food coloring in the cold water. This is because the molecules in the hot water move faster than the molecules in the cold water, causing the food coloring to spread faster.
You can also teach your class about what makes a rainbow by filling a glass with water and holding it above a white piece of paper in the sunlight. The sunlight will go through the glass and make a rainbow in the sheet of paper.
You can use this experiment to teach your class about the refraction of sunlight, and how the rainbows we see in the sky are actually sunlight refracting off of the water molecules in the air left over from the rain.
These are just few science experiments that can be fun and educational for your class, each teaches them a scientific principle while capturing their attention in a fun way.
by: Jack Landry
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