Other slides in this set

Slide 2

Preview of page 2

Here's a taster:

Disposal of Plastics
Plastic waste is a serious problem.
Most plastics are not biodegradable, which means that they are
not broken down by micro-organisms and so do not rot.
Plastic waste litters our roads,
beaches, farmland and
It can cause harm to animals
that inadvertently become
tangled up in it, or try to eat it.
There are three main ways in
which we deal with plastic waste:…read more

Slide 3

Preview of page 3

Here's a taster:

Disposal of Plastics - Burning
Plastics produce poisonous fumes when they are burnt. These toxic
fumes pollute the atmosphere and can aggravate certain medical
conditions such as asthma.
A piece of nylon being burnt…read more

Slide 4

Preview of page 4

Here's a taster:

Disposal of Plastics - Recycling
Thermosoftening plastics are easy to recycle as they can be melted
and remoulded.
Thermosetting plastics are much harder to recycle. They have to
be heated to 700°C in anaerobic conditions (in the absence of air).
This process is called pyrolysis. (The prefix `pyro' means `fire'
and `lysis' means `splitting' so pyrolysis means `fire-splitting').
In such conditions, the polymers do not burn - they decompose to
form their original monomers which can then be recycled.
Plastic recycling is not very economical as the different types of
plastics must be collected and sorted before recycling can begin.
Not only is this time consuming, but when added to the cost of
the pyrolysis process it becomes very expensive.…read more

Slide 5

Preview of page 5

Here's a taster:

Disposal of Plastics - Recycling
It is still cheap to make new plastics from crude oil, but as oil
becomes more expensive, recycling will become more economical
and a necessary and viable alternative.
When recycling bins are clearly labelled with these codes, people
will be able to separate the different plastics, making collection a
more straightforward process.…read more

Slide 6

Preview of page 6

Here's a taster:

Figures show that household recycling in the UK is increasing,
although we are still way behind some European countries...…read more


No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all resources »