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Air. By Mr. Bronks. 0.03%. Composition of Air. Air breathed in. Air breathed out. 21%. 79%. Oxygen in Air. The part of air that supports combustion or burning Used up by breathing so use in hospitals Also rusting or corrosion Rockets carry their own supply of Oxygen.

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Air

By

Mr. Bronks


Composition of air

0.03%

Composition of Air

Air breathed in

Air breathed out

21%

79%


Oxygen in air
Oxygen in Air

  • The part of air that supports combustion or burning

  • Used up by breathing so use in hospitals

  • Also rusting or corrosion

  • Rockets carry their own supply of Oxygen



Burning things

Magnesium + oxygen Magnesium oxide

Carbon + oxygen Carbon dioxide

Sulphur + oxygen Sulphur dioxide

The Fire Triangle

Fire

Burning things

When something is burned it reacts with oxygen. For example:

Oxygen

Fuel

Heat


Percentage of oxygen
Percentage of Oxygen

When we cover the candle the oxygen is used up – the water rises to fill the gap

We measure the rise and find it’s around 21%

Gas Jar

Candle

Water


Testing for carbon dioxide

Air

Limewater

Limewater turns milky/cloudy

Testing for carbon dioxide

Proves Carbon Dioxide in Air


Testing for water vapour in air

Ice and Salt

Drops on the test tube

Testing for Water Vapour in Air

Cobalt Chloride Paper turns pink in the presence of water


Catalyst
Catalyst

  • A substance that speeds up a chemical reaction but is not used up in the reaction. Here platinum is used as a catalyst in this catalytic converter.

CO2

CO2

CO


Catalyst1
Catalyst

  • A substance that speeds up a chemical reaction but is not used up in the reaction. Here platinum is used as a catalyst in this catalytic converter.

CO2

CO2

CO2

CO


Oxygen
Oxygen

  • Catalyst speeds up reaction but is not used up – Manganese Dioxide

  • Oxygen does not dissolve in the water


Test for oxygen
Test for Oxygen

  • Relights a glowing splint

Oxygen


Test for oxygen1
Test for Oxygen

  • Relights a glowing splint


Burning magnesium in oxygen
Burning Magnesium in Oxygen

  • Burns much brighter

  • In fact goes crazy-nuts-bright-and-scary

Oxygen


Burning magnesium in oxygen1
Burning Magnesium in Oxygen

  • Very Bright Flame


Burning magnesium in oxygen2
Burning Magnesium in Oxygen

  • White Powder remains- Magnesium Oxide


Water

  • Add water

2MgO +H2O2Mg(OH)


Water

Red Litmus turns Blue colour proves liquid is a BASE

2MgO +H2O2Mg(OH)


Burning magnesium in oxygen3
Burning Magnesium in Oxygen

  • Very Bright Flame

  • White Powder remains-

    Magnesium Oxide

Add water and Red Litmus paper turns Blue colour proves liquid is a BASE


Rusting also needs oxygen
Rusting also needs Oxygen

Just like the candle the steel rusts and oxygen is used up. The space is filled with water

Steel wool

Rusted

Gas Jar

Water

2 weeks later


Preventing rusting
Preventing Rusting

Metals needs water and oxygen to rust


Preventing rusting1
Preventing Rusting

  • Plating

  • Painting

  • Greasing

  • Dry

  • Galvanising



H/W

  • P233

  • Q 1,2,3,4,5.


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