Combustion Equation D. Crowley, 2008

Combustion To know the equation for combustion, and how to test for its products Friday, August 21, 2015

Riddle Take away oxygen and I no longer live Heat and light is what I so often give I have so much energy that I just have to release Hydrocarbons make a lovely feast! Get in my way and you’ll have a fright I will certainly hurt, although I do not bite. What a peculiar riddle I hear you cry But tell me this, just who am I?

Fire

Combustion What is combustion? Combustion is the scientific name for burning – a chemical reaction Combustion is the reaction when a substance burns and reacts with oxygen to produce heat and light energy

Candle Why does the candle in experiment 1 go out and why does the candle in experiment 2 rise? As the candle burns, oxygen is used up (eventually causing the candle to go out). As the oxygen is used up there is a pressure change, causing the water to be sucked up from the bowl

Combustion What is made during combustion – what does the limewater and cobalt chloride test for? Limewater test for carbon dioxide (cloudy) and the cobalt chloride paper shows that water was also produced

Combustion Combustion results in the formation of both carbon dioxide & water When substances burn, reacting with oxygen, the new products formed are called oxides Carbon + Oxygen → Carbon Dioxide Hydrogen + Oxygen → Water Methane (CH 4 ) is often used in cooking (it contains both carbon & hydrogen) When it is burnt in oxygen it produces the following products: - Methane + Oxygen → Carbon Dioxide + Water

Carbon Dioxide Combustion produces carbon dioxide – why can this be a problem? Carbon dioxide is a greenhouse gas – it traps heat which can lead to global warming…

Global Warming Your task is to produce a poster as a group which shows us why combustion (via factories & cars) can be a really bad thing (thinking about CO 2 production leading to global warming) Think about why we should cut down on the amount of fossil fuels we burn & consider what alternatives we could use…

Carbon Footprint You can work out your carbon footprint: - Carbon Footprint