(1)
Crude oil is a
of a very large number of
compounds.
(2) A
consists of two or more elements or compounds
chemically combined together.
(3) The chemical properties of each substance in the mixture are
.
(4) It is possible to
the substances in a mixture by
methods including distillation.
(5) Most of the compounds in crude oil consist of
made up of
(H) and
(C) atoms only which is why they are called
.
(6) Alkane molecules can be represented in the following forms:
is a way of summarising the atoms in the molecule, and is called the
.
is a way of showing the full
.
(7)
The many hydrocarbons in crude oil may be separated into
, each of which contains molecules with a similar
of carbon atoms.
(8) This is done by
the oil and allowing it to
at a number of different
because of their different
(9) This is done in a tall structure called a
. and this method of separating the components of crude oil is called
.