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Extracting vegetable oils
Some seeds, nuts and fruits are rich in vegetable oils. The Oils
can be extracted by pressingfollowed by removing water and other
impurities. Some oils are extracted by distilling the plants mixed
with water. This produces a mixture of oil and water from which
the oil can be seperated.
The Molecules in vegetabl oils have hydrocarbon chains. Those with
carboncarbon double bonds are unsaturated. if there are several
double bonds in each molecule, they are called polyunsaturated.
Unsaturated oils will react with bromine or iodine. Bromine water
is used as the test for an unstaurated compound.
Vegetable oils produce a lot of energy when eaten or when we burn
them as fuels.
SO, The Key Points are
1. Vegetable oils can be extracted from seeds, nuts and fruits by pressing or by distillation.
2. Vegetable oils provide a lot of energy as foods or fuels.
3. Some vegetable oils are unsaturated because their molecules
contain carboncarbon double bonds. :)
Also a tip from a AQA examiner...
"There are lots of different vegetable oils, but they all have
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Q1. What two methods are used to extract vegetables oils?
Q2. Why are vegetable oils important as foods (and!) fuels?
Q3. What is meant by an unsaturated oil?
Q4. What can you use to test an oil for unsaturation?
The Answers are at the bottom.…read more
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Pressing and distillation (with water added).
2. They Produce a lot of energy.
3. An oil with molecules that contain carboncarbon double bonds (so they contain fewer
hydrogen atoms than the corresponding saturated molecule).
4. Bromine Water.…read more