Make Carbon Dioxide

Needed:

  • A gallon jug
  • A beach ball
  • A cork stopper
  • A medicine dropper
  • Water
  • Sugar
  • Molasses
  • Yeast
Experiment:
Mix a cup of sugar, two tablespoons of molasses, and yeast in 3/4 jug of water. Attach the ball by placing the medicine dropper through the stopper and into the opening in the ball after squeezing out the air. Set in a warm place. Within several days the ball should fill with carbon dioxide. A large balloon can also be used to trap the carbon dioxide produced.

Explanation:
Yeast plants growing in the solution change sugar to alcohol and carbon dioxide gas. The alcohol dissolves in the water, and the gas fills the ball. Hold the opening of the ball to the mouth or nose and "taste" some of the gas. It may smell like molasses, but will definitely have a tingle as from a soft drink. Carefully and slowly "pour" some of the gas into a jar. Lower a candle into it and the flame goes out. Carbon dioxide gas is more dense than air and displaces the air when "poured" into the jar. Without oxygen from the air, the candle cannot burn, so the flame is extinguished.