(TP2) chapter 7 Air

Air is _____ because the composition of air combines physically and can be separated by physical method

Air is mixture because the composition of air combines __(a)__ and can be separated by __(b)__ method.

• (a) physically

• (a) chemically

• (b) physical

• (b) chemical

Gas content in the device used in the picture

• Oxygen

• Inert gas

• Nitrogen

• Carbon dioxide

Gas content in the device in the picture

• Oxygen

• Inert gas

• Nitrogen

• Carbon dioxide

Gas content in the making of the material in the picture

• Oxygen

• Inert gas

• Nitrogen

• Carbon dioxide

Gas content in the object in the picture

• Oxygen

• Inert gas

• Nitrogen

• Carbon dioxide

Characteristics of carbon dioxide that allow it to be used as a fire extinguisher.

• Does not support combustion

• Colourless gas

• Lower surrounding temperature

• Decrease the concentration of oxygen

• Covers the burning area so that oxygen supply is sparse

Hazardous activities that can cause fire

• Playing with lighter

• playing with firecrackers

• Ironing clothes using electrical iron

• not maintaining electrical wiring

• cooking food with stove

Sources of Chlorofluorocarbon (CFC) pollution

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Pollutants particles/gases that it emit

• Carbon monoxide

• Smoke

• Soot

• CFC