1. Some of the useful smaller molecules from cracking are used as
since they release a large amount of heat
on burning. However it is the
s called
s which are used in this way as the
s known as
s which burn with a smokey flame AND they are a much more
chemical
for making other very useful compounds like
(plastics).
2. Identify the following hydrocarbon compounds by name and whether they are a saturated hydrocarbon or an unsaturated hydrocarbon, and classify them as an alkane or alkene.
2a.
or
is called
, a
, classed as an
2b.
or
is called
, an
, classed as an
2c.
or
is called
, a
, classed as an
2d.
or
is called
, a
, classed as an
2e.
or
is called
, an
, classed as an
2f.
or
is called
, a
, classed as an
3. To test for an alkene (which is
) you mix it with a few drops of bromine water when it changes from
to
. If you repeat the test with an alkane, the
bromine water remains
. This simple test can readily distinguish between a
(all C-C
s) and an
(with a C=C
).