Students at Aristotle Preschool and Kindergarten are exploring various simple science concepts. Some of these are simple enough that any parent can do this at home with their child.
Talked about air and how it is a gas that we breathe in.
Properties of gases:
Gas expands and takes up all the available space.
Gas expands when it is heated ( the molecules have more energy and they move around more.)
Gas condenses when it is cooled ( the molecules lose energy and slow down.)
Take a empty water bottle and put a balloon Over the bottle opening. Put the bottle in a bowl filled with ice And water. Observe what happened to the balloon. Next take the balloon and bottle and place it in a pot of boiling water. Observe what happened to the balloon.
Repeat experiments over again and again. You should notice that the balloon deflates in the cold water and expands in the hot water.
Explanation: The gas in the balloon expands when placed in the hot water. The heat from the water causes the molecules in the gas to gain energy and they move around more and expand. When placed in the cold water in the molecule slow down, lose energy and condense causing the balloon to deflate.
With a funnel pour 1/2 tablespoon of baking soda into 9 inch. Balloon. Next Pour half cup of vinegar into an empty water bottle. Place the balloon over the opening and lift up balloon so baking soda falls into the vinegar.
The balloon inflates. The chemical reaction between the baking soda and vinegar produces carbon dioxide gas which inflates the balloon.
To demonstrate the presence of carbon dioxide gas in soda
One round nine-inch balloon
One small bottle of carbonated soda
Put a teaspoon of salt in the balloon. Cover the mouth of the soda bottle with the balloon. Pick up the balloon so the salt will go into the soda. Watch and observe what happens. It is a good idea to put the soda on some newspaper. This can get messy!
The salt releases carbon dioxide from the soda, making the balloon inflate. Many carbon dioxide bubbles form on each grain of salt (nucleation sites) resulting in the soda foaming up. The soda goes back down into the bottle, but the balloon stays inflated due to the carbon dioxide gas.
By Areti, Community Contributor
Source: Chicago Tribune - http://goo.gl/8JiWT