Combustion cgrahamphysics.com 2016
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1 ombustion
2 Your are stranded in the wilderness Which item would you chose to start a fire? ow To Make Fire With A LEMN
3 Starter: the fire triangle Draw this triangle and label the three things that needs?
4 7F Reactions with oxygen Fire triangle Starter: the fire triangle oxygen This colourless gas is needed for all substances to burn. heat Some energy is needed to start the burning reaction this is usually heat energy from a spark or a flame. fuel fuel Any substance that can burn (or combust) is called a fuel. ow can fire fighters use the fire triangle to control fires?
5 17 May 2016 Aim Explain what a fuel is Recall the equation for combustion Key words ombustion hemical reaction xide ydrocarbon Equation for combustion
6 an all fires be put out? In which town is a fire burning since 1962? What started the fire? ave you ever wondered The bigger picture
7 ould you survive without combustion? Mastery of fire was one of the great achievements of primitive man. Burning fuels is still a hugely important process. It does of course provide us with warmth. It also provides us with over 90% of our energy for transport, factories and home including electricity. Without combustion life would be very different!
8 ombustion Burning is a chemical reaction. When things burn they react with oxygen in the air and energy is released as heat and light. This chemical reaction is called combustion.
9 Burning fuels ombustion methane + oxygen carbon dioxide + water
10 ombustion Inverted funnel Methane gas burning 2 Water condenses
11 Questions 1. What gas does methane ( 4 ) react with when it burns? oxygen 2. What substance will the carbon change into when it combines with your answer from Q1? 3. What substance will the hydrogen change into during the reaction? 4. What is the word equation for the reaction? methane + oxygen carbon dioxide - 2 carbon dioxide water water
12 Fuels A fuel is something that can be burned to release heat and light energy. The main examples are: Although these fuels look different, they all contain ARBN cgrahamphysics.com and 2016 YDRGEN
13 Lots of oxygen: Some oxygen: Little oxygen: Methane xygen + Water + arbon dioxide xygen + Methane arbon monoxide Water + Methane xygen + Water + arbon
14 Problems of combustion limate change Acid Rain
15 Which will combust the best? 100% ydrogen 100% xygen 50% hydrogen 50% oxygen ydrogen xygen Balloon Explosion
16 ombustion of ydrogen That s better! No carbon dioxide, only water. That means no acid rain and no climate change!
17 9 Fuels or fools? Plenary: true or false? ombustion Many ydrogen oal, Respiration is oil fuels mainly and fuel produce is and natural sulphur is a the oxidation very acidic gas combustion and clean are gases tar. reaction. all fuel. fossil when of hydrocarbon fuels. they burn. fuels are very similar reactions. FALSE! TRUE! This Both The an ydrogen oal causes fuel you is over explain combines oxygen burns acid 90% rain. how and to carbon with form Sulphur produce they oxygen water. with got impurities carbon that perhaps from The name? exhaust the dioxide 2 in air or the 3% and fuel water. from sulphur. it burn is a oxidised. But hydrogen-powered to they form are acidic different sulphur vehicle food dioxide. would doesn t be burn just inside steam! you!
18 Key words 17 May 2016 ombustion - The scientific word for burning. It means a substance reacts with oxygen hemical reaction - When new substances are formed xide - A compound that includes oxygen ydrocarbon - A chemical compound containing only hydrogen and carbon Equation for combustion fuel + oxygen carbon dioxide + water
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