Fire Extinguisher

This video from the Royal Society of Chemistry (RSC), aimed at primary teachers, demonstrates an experiment which may be used when learning about the gases, changing state and irreversible reactions.

Night lights are placed in a glass bowl and lit whilst bicarbonate of soda is placed in a jug and vinegar added slowly. Carbon dioxide gas is produced as the vinegar reacts with the bicarbonate of soda. As carbon dioxide is heavier than the air, it stays in the jug and may be poured into the bowl of night lights. The carbon dioxide displaces the air in the bowl and the night lights are extinguished as they no longer have any oxygen to keep them alight.

This demonstration could be used to show the properties of gases with children providing explanations for what they have observed.

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