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Burning Hydrocarbons

Balancing the combustion equations
by

mr lowe

on 26 March 2013

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Transcript of Burning Hydrocarbons

When a hydrocarbon burns in air
it produces
carbon dioxide and water Remember that
even though you burn the hydrocarbon in air it is only the oxygen in air that reacts word equation hydrocarbon + oxygen --> carbon dioxide + water 2 This will normally be an alkane Alkanes
are
saturated
hydrocarbons The general formula
of an alkane is
C H n 2n+2 Burning Hydrocarbons a hydrocarbon is
a compound of
hydrogen and carbon propane + oxygen --> carbon dioxide + water word equation symbol equation C H 3 8 So if the hydrocarbon is propane
with three carbon atoms the formula will be
C H 3 8 Now add in the other formulae everybody knows water is H2O 2 even my cat knows that carbon dioxide is CO 2 My cat knows this one too oxygen gas is O 2 Just like the phone company! that's why there are always
bubbles in the adverts 2 propane + oxygen --> carbon dioxide + water C3H8 + O2 --> CO2 + H O 3 8 2 2 2 propane + oxygen --> carbon dioxide + water This equation needs to be balanced This gives the number of carbon atoms in the alkane.
This is how many carbon dioxide molecules you will make C H + O --> 3CO + H O 3 8 2 2 2 This tells you how many H's you have in the hydrocarbon.
Halving this gives the number of H O molecules. propane + oxygen --> carbon dioxide + water C H + O --> 3CO + 4H O 8 3 2 2 2 To balance the oxygens
you can count O's or O 's 2 There are 6 O's here
That's 3 O 's 2 propane + oxygen --> carbon dioxide + water C H + 5O --> 3CO + 4H O 3 8 2 2 2 and there are 4 O's here
that's 2 O 's 2 That makes 10 O atoms or 5 O molecules in all 2 When a hydrocarbon burns fully,
in a plentiful supply of oxygen,
it is called complete combustion You can recognise
complete combustion by the products.
Carbon Dioxide, CO , is formed. 2 complete
combustion gives CO 2 which is fully
oxidised 2 2 Sometimes
the alkane doesn't
burn fully. This is
incomplete combustion. You can recognise
incomplete combustion by the products.
Carbon monoxide, CO, is formed. incomplete
combustion gives CO which is only partly
oxidised propane + + water limited
oxygen carbon
monoxide C H + O CO + H O 3 8 2 2 C H + O 3CO + 4H O 3 8 2 2 We are still burning propane
with its three carbons and eight hydrogens so we get three
carbon monoxide molecules
and four water molecules that is seven O's 3 1 / 2 or oxygen molecules 3 1 / 2 Yes, you can use halves in this equation C H + O 3CO + 4H O 3 8 2 2 3 1 / 2 propane + + water limited
oxygen carbon
monoxide propane + oxygen carbon dioxide + water complete combustion C H + 5O 3CO + 4H O 3 8 2 2 2 incomplete combustion C H + O 3CO + 4H O 3 8 2 2 3 1 / 2 propane + + water limited
oxygen carbon
monoxide CARBON MONOXIDE POISONING
– WHAT ARE THE SYMPTOMS? You can’t see it, taste it or smell it but it can kill quickly and with no warning.
The symptoms are... Unsafe gas appliances produce a highly poisonous gas called carbon monoxide (CO). It can cause death as well as serious long term health problems such as brain damage. Being aware of the symptoms could save your life.
Carbon monoxide symptoms are similar to
flu, food poisoning, viral infections and simply tiredness. Signs that could point to
carbon monoxide poisoning: Your symptoms only occur when you are at home Your symptoms disappear or get better when you leave home and come back when you return Others in your household are experiencing symptoms (including your pets) and they appear at a similar time Carbon Monoxide is a highly poisonous gas.
You can't see it, taste it or smell it but......... It can kill you quickly with no warning CO CO
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