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Activity

Gas collection over water

Summary: 
Collect gases (oxygen and carbon dioxide) over water, then show how to test them with a glowing/lighted splint.
Science content (2016 curriculum): 
Chemistry: States of Matter, Properties of Materials (K-7)
Chemistry: Chemical Changes (2, 7)
Science topic (2005 curriculum connection): 
Physical Science: Chemistry (grade 7)
Materials: 
  • tray filled with water
  • water
  • glass bottle filled with water
  • reaction bottle with tube attached to lid
  • reactants: H2O2 and yeast to make oxygen; baking soda and vinegar to make CO2
  • splint
  • lighter
Procedure: 

Collect oxygen over water.
Relight a glowing splint by lowering it into the tube of oxygen. Feel the exothermic reaction.

Collect CO2 over water - puts out a lighted splint.

Notes: 

Developed for The Chemistry of Gases and Pressure lesson

Teaching site: 
At home (only noted before doing in a classroom)