Combustion and Fuels Quiz

The process where a substance reacts with oxygen, releasing heat.

A substance that easily catches fire and burns, like wood or paper.

A substance that cannot catch fire and burn, like water or sand.

The lowest temperature at which a substance catches fire.

Substances that catch fire easily due to their low ignition temperature, like petrol or alcohol.

A chemical reaction where a substance combines with oxygen, producing heat and light.

The minimum temperature a substance needs to start burning.

The rough surface of a matchbox that provides friction to ignite the matchstick.

A chemical compound used in matchsticks that ignites easily when rubbed against a rough surface.

Water cools the burning material, reducing its temperature below the ignition point.

CO₂ is heavier than air and displaces oxygen, preventing the fire from getting the fuel it needs to burn.

Water can conduct electricity, making it dangerous to use on electrical fires. It can also spread flames in some cases.

The heat from the water being heated is transferred to the paper cup, preventing it from reaching its ignition temperature and burning.

Water cools the burning material below its ignition point, preventing it from catching fire again. Water vapor also forms a barrier, cutting off oxygen supply.

Carbon dioxide is heavier than air and forms a blanket over the fire, blocking oxygen access and stopping the burning process.

Water can conduct electricity, potentially causing harm to the firefighters and making the situation worse.

Water is denser than oil, so it sinks below the oil. The oil remains burning on the surface, making the fire even worse.

Soda-acid extinguishers use a chemical reaction to produce carbon dioxide, which then blankets the fire and cuts off oxygen.

A type of combustion where a substance ignites without any external source of heat, like a spark or flame. This usually happens due to internal heat build-up.

A type of combustion where a substance reacts quickly with oxygen, releasing a large amount of energy as heat and light in a short period of time.

A rapid combustion reaction that produces a large amount of energy, generating heat, sound, and light waves, creating a pressure wave.

The heavier-than-air $CO_2$ gas produced by reacting concentrated sulphuric acid and potassium bicarbonate cuts off the oxygen supply to fire, controlling it.