Pouring air

The video explains how candles burn by using oxygen and demonstrates how carbon dioxide, specifically from dry ice, can extinguish a candle. By filling an aquarium with carbon dioxide and pouring it over the candles, the denser gas displaces the oxygen, causing the candles to go out.

What is the primary element that candles need to burn?

• Nitrogen

• Oxygen

• Carbon dioxide

• Hydrogen

What is another name for frozen carbon dioxide?

• Liquid nitrogen

• Water ice

• Solid oxygen

• Dry ice

Why does carbon dioxide extinguish a candle flame?

• It is colder than air

• It is lighter than air

• It displaces oxygen

• It absorbs heat

What happens to the oxygen when carbon dioxide is poured over the candles?

• It remains unaffected

• It gets absorbed by the candles

• It combines with carbon dioxide

• It is pushed out of the way

What is the result when the oxygen is displaced by carbon dioxide in the experiment?

• The candles burn brighter

• The candles go out

• The candles melt faster

• The candles change color