Chemistry- C7 Part B

Across

• 1. ... are long molecules formed when small molecules (monomers) join together - polymerisation, high pressure and a catalyst. Plastics are usually made up of ... -usually carbon based and monomers are often alkenes (8)
• 4. First 4 ... are : Ethene, propene, butene and pentene and they have the general formula: CnH2n (7)
• 5. General formula of these is CnH2n+1OH, they all contain an OH group. First 4 in the homologous series are: Methanol, Ethanol, Propanol and Butanol (8)
• 6. In a lot of .. alkenes combust completely. Not enough ... in air to do that so they undergo incomplete combustion. Carbon and carbon monoxide produced. Incomplete combustion results in a yellow smoky flame, less energy is released. (6)
• 7. ... have a double bond between two of the carbon atoms, is also a hydrocarbon. they have two fewer hydrogen, makes them unsaturated. double bond can open up to be a single bond so 2 carbons can bond with something else, makes them very reactive (7)
• 8. A ... group is a group of atoms which determine how the molecule typically reacts. All alkenes have the same ... group (10)