Air By Mr. Bronks Composition of Air Air breathed inAir breathed out 79% 21% 0.03%

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Presentation transcript:

Air By Mr. Bronks

Composition of Air Air breathed inAir breathed out 79% 21% 0.03%

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

Rocket Fuel?

Burning things When something is burned it reacts with oxygen. For example: Magnesium + oxygen Magnesium oxide Carbon + oxygen Carbon dioxide Sulphur + oxygen Sulphur dioxide The Fire Triangle Fire Fuel Oxygen Heat

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% Candle Water Gas Jar

Testing for carbon dioxide Air Limewater turns milky/cloudy Limewater Proves Carbon Dioxide in Air

Testing for Water Vapour in Air Drops on the test tube Ice and Salt Cobalt Chloride Paper turns pink in the presence of water

CO 2 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. CO 2 CO

CO 2 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. CO 2 CO CO 2

Oxygen Catalyst speeds up reaction but is not used up – Manganese Dioxide Oxygen does not dissolve in the water

Test for Oxygen Relights a glowing splint Oxygen

Test for Oxygen Relights a glowing splint

Burning Magnesium in Oxygen Burns much brighter In fact goes crazy-nuts-bright-and-scary Oxygen

Very Bright Flame Burning Magnesium in Oxygen

White Powder remains- Magnesium Oxide Burning Magnesium in Oxygen

Add water 2MgO +H 2 O  2Mg(OH) Water

2MgO +H 2 O  2Mg(OH) Water Red Litmus turns Blue colour proves liquid is a BASE

Very Bright Flame White Powder remains- Magnesium Oxide Burning Magnesium in Oxygen Add water and Red Litmus paper turns Blue colour proves liquid is a BASE

Rusting also needs Oxygen Just like the candle the steel rusts and oxygen is used up. The space is filled with water Steel wool Water Gas Jar 2 weeks later Rusted

Preventing Rusting Metals needs water and oxygen to rust

Preventing Rusting Plating Painting Greasing Dry Galvanising

Summary

H/W P233 Q 1,2,3,4,5.