Fractional distillation of air

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Last lesson

• Uses of carbon dioxide

• Oxides of nitrogen

• Fractional distillation of air

Uses of carbon dioxide

Fizzy drinks. The higher the pressure, the more soluble the gas becomes.

So what happens when the pressure

is released?

Uses of carbon dioxide

Dry ice (actually it’s condensed water vapour that you can see.)

Uses of carbon dioxide

Fire extinguishers

Oxides of nitrogen

Nitrogen is generally an unreactive gas, and needs fairly extreme conditions to get it to react with oxygen

Nitric oxide, NO

Lightning brings about the direct union of nitrogen and oxygen in the air to produce small amounts of nitric oxide, as does the high temperatures produced in car engines.

Nitric oxide, NO

It is a toxic air pollutant, often linked with asthma and allergic responses

Nitrous oxide, N2O

Formed when ammonium nitrate, NH4NO3, is heated. A colourless gas with a pleasing odour and sweet taste, is used as an anesthetic for minor operations, especially in dentistry.

Nitrous oxide, N2O

It is called laughing gas because of its intoxicating effect. It is alsowidely used as a propellant in aerosol cans of whipped cream!

Nitrogen dioxide, NO2

In the presence of excess oxygen, nitric oxide, NO, will be converted to nitr ogen dioxide,NO2. Nitrogen Dioxide is a reddish brown, toxic gas at room temperature. NO2 condenses to a brown liquid, but freezes to a colourless solid.

Nitrogen dioxide, NO2

Nitrogen Dioxide has been used as a catalyst in certain oxidation reactions; as a nitrating agent for organic compounds; as an oxidizing agent; as a rocket fuel; and as a flour bleaching agent

Today’s lesson

• The allotropes of sulphur

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Question

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