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Organic Molecules
· All contain CARBON
· Examples ­ carbohydrates (starch and sugars)
fats
alkanes and alkenes
alcohols
ketones
aldehydes…read more

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Recap Questions
· What is a hydrocarbon?
· What are the 2 products when they are burnt
(in lots of oxygen)?
· What is the difference between alkanes and
alkenes? What is the test?…read more

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Empirical Formula ­ Remember this?
· This is the ratio of the elements in the
compound.
· It can be worked out using 3 simple steps if
you know the % of each element.
· 1 ­ Convert % into grams
· 2 ­ Divide by its Ar (this gives you moles)
· 3 ­ Divide all by smallest number of moles you
have…read more

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Example
A compound is 80% Carbon and 20% Hydrogen. What is its
empirical formula?
Carbon Hydrogen
Convert 80g 20g
to grams
Divide by Ar 80/12 = 6.67 20/1 = 20
Divide by 6.67/6.67 = 1 20/6.67 = 3
smallest
So ratio is 1 : 3 The empirical formula is CH3…read more

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Your Turn...
· A compound is 76% Lead, 13% Chlorine, 2.2%
Carbon and 8.8% Oxygen. What is its empirical
formula?
· Do it the same way as before, this time you
need 4 columns though ­ one for each
element…read more

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