GCSE science-CHEMISTRY word-fill Quiz 2 on OIL PRODUCTS

* Choose the words to fill the gaps from the drop-down menu and press CHECK. You can print out and return to check your answers later. * EMAIL comment?query * Updated Doc Brown's Chemistry June 21st 2009 *

biodegradable bottles carbon catalyst cracked crates decomposition dioxide disposal heating hydrogen methane oxygen petrol poly(ethene) poly(propene) polymers rain ropes smaller sulphur thermal waste

(1) Large hydrocarbon molecules can be broken down or to produce , more useful molecules. This process involves the hydrocarbons to vaporise them and passing the vapours over a hot . A reaction then occurs and some of the products of cracking are useful as fuels eg some more .

(2) Most fuels contain and/or hydrogen. The gases released into the atmosphere when a fuel burns are mainly carbon dioxide and water which is an oxide of . A typical word equation might be ...
(fuel) + (in air) ==> carbon dioxide + water

(4) Some fuels contain sulphur which burns to form . This is a lung irritant and the major cause of acid .

(5) Other products of cracking can be used to make plastics or . For example poly(ethene) and poly(propene). The plastic is used for making plastic bags and . The stronger plastic is used for making milk and . Most plastics, including poly(ethene) and poly(propene), are not broken down by microorganisms. Because they are not it causes problems with .