PDF chapter test TRY NOW

An activity to identify the gas found in the air that we exhale:
 
Aim:
 
To prove that the exhaled air is rich in carbon dioxide.
 
Materials required:
  • Two glass jars
  • Lime water
  • Straw
Procedure:
 
Leave the first jar with lime water undisturbed, blow air in to the second jar with the help of a straw.
 
Important!
This exercise needs to be performed, and thus will be checked manually by your teacher.