Cracking is the term when a long unuseful molecule like bitumen are broken down into short more useful molecules like petrol.
In cracking you always make and alkeneand an alkane
This is where we use heat to crack a molecule. This is how most cracking is done.
Plastics are very large molecules. They are made of small building blocks called monomers. These are always alkene showing that they have double bonds. They join to form a long chain called a polymer.
Plastics are non-biodegradable. This means they do not deteriate. It is a problem to burn plastics because they give out toxic fumes and take a lot of energy to burn. It is a problem recycling plastics because its hard to identify different types of plastics.
Thermosoftening plastics have no cross links, melt and are flexible and stretchy.
Thermosetting plastics burn (don't melt) and are rigid and because they have hard cross links.
A student in England studying Automotive Engineering with Motorsport, Will created Ask Will Online back in 2010 to help students revise and bloggers make money. You can follow AskWillOnline via @AskWillOnline.
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About Will Green
At first, I was using Ask Will Online to help myself revise for school exams. I then started to find areas in blogging that were tricky to overcome so I started making articles on generally blogging help. Now, Ask Will Online has differentiated into many sub categories so that even more people can now take use of my website.