Welcome back to Apologia General Science Lab Module 12!
This lab session was pure fun!
12.1 What Combustion Needs
First, light a tealight and place it in a bowl.
Next, place a glass over the tealight and watch what happens. (Ok, that's a no brainer)
Relight the tealight, place it in vinegar add baking soda and watch what happens.....
Now, try to relight the tealight..... try again and again and again! The flame just goes out about an inch above the tealight!
....hmmmm, what is missing that is necessary to fuel fire?
MORE SCIENCE TOOLS
Experiment 12.2 The Products of Combustion
Make an indicator from red/purple cabbage and allow to cool....
Fill a 2 liter bottle 1/8 full of vinegar. Add baking soda to the bottle and quickly cover the opening of the bottle with a balloon to capture the carbon dioxide.
Next, pour 1/4 cup of indicator from the saucepan into three glasses.
Holding the neck of the balloon tightly, remove it from the top of the 2 liter bottle. Place one end of the straw in the indicator of one of the glasses. Then place the opening of the balloon over the other end of the straw and gently blow carbon dioxide through the straw into the indicator water. Notice the color change! (This is shown three pictures down and is the middle glass)
Using another straw place one end in the indicator water and blow through the other end so that your breath goes directly from the straw up through the water. Compare the color change. (This is pictured two pictures down with the straw in the glass).
The first glass is the control and did not receive any carbon dioxide. The middle glass received carbon dioxide from the balloon and the last glass received exhaled breath.
Check out more Apologia General Science labs here.
Join us next time for The Human Digestive System!