Properties of Carbon Dioxide Activity - pg. 86
(Heavier than Air, Colorless and Puts out Fires)
When demonstrating that carbon dioxide is colorless, heavier than air and does not support combustion we find that the carbon dioxide extinguished the match because it cannot support combustion. This was proved when the gas was poured into the small cup and the candle went out. As carbon dioxide is poured from one container to another, the level in each container changes. The large container now has less, and the small cup has more carbon dioxide than when we started. The level of gas in each container can be observed by lighting a match and lowering it into the container. Carbon dioxide is heavier than air and can be poured from one container to another. It will not support combustion, the candle will go out when it comes in contact with the gas.