231
Diamond molecule
Diamond is the hardest
natural substance known.
Its hardness comes from
the way the carbon
atoms in each diamond
are arranged. Each atom is
joined by strong bonds to
four neighbouring atoms.
Molecules
Each group of five atoms in
a diamond forms a pyramid
shape. This shape makes
diamond amazingly strong.
Become
an expert
224-225
Properties
of matter
226-227
Changing
states
No, you can burn them.
Graphite molecule
Graphite, like diamond,
is also made of carbon
atoms, but the atoms are
arranged in a different
way, making graphite
very soft.
Each carbon
atom in graphite
is joined to only
three neighbours.
The atoms form
layers that slip over
each other, making
graphite soft
.
Evaporate:
As a liquid
heats up, its molecules speed up
until they move fast enough to
float away as gas.
Condense:
When gas
molecules lose energy and slow
down, they stick together
and form liquid.
A gas can fill any container
it’s put in. If there’s no lid to
seal the container, the gas will
escape into the air.
Gas
Diamond is made
into jewels that are
almost indestructible.
Graphite is used to make
the soft lead in pencils.
