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Chemistry unit 2 gcse aqa

Thermosoftening polymers forces between chains are easy to overcome. No crosslinks. Can melt +remould these plastics. Weak intermolecular forces
Giant covalent structures all atoms are bonded by strong covalent bonds. v. high melting +boiling points. dont conduct electricity. *Diamond, graphite, silicon dioxide
Thermosetting polymers have crosslinks. holds chains together in a solid structure. the polymer doesnt soften when its heated. they're strong, hard, rigid
Properties of metals high melting +boiling points. Good conductors of heat & electricity (cause of free electrons)
Low density polythene made by heating ethene to 200*c under high pressure. flexible-used for bags n bottles
Ionic bonds metal+non-metal donating. atoms become ions. high melting n boiling points. dissolve easy in water- carry electric current.
High density polythene made at lower temp +pressure (w/catalyst) more rigid n used for water n drainpipes
simple molecular substances forces of attraction between molecules are v weak. low melting n boiling points. dont conduct electricity.
Ion? when atoms lose or gain electrons. atom becomes charged.
convalent bonding sharing. strongest type of bond. non-metals
calculating moles no. of moles= (g)/Mr
alloy? is a mixture of two or more elements where at least one element is a metal
diamond's structure 4 covalent bonds per carbon atom. the hardest natural substance.
compounds? chemically bonded elements
Graphite pro each carbon forms 3 bonds. creates layers-can slide. making it slippery soft. weak intermolecular forces between layers.
isotopes? different atomic forms of the same element which have the same number of protons but different numbers of neutons.
delocalised where electrons are free to move within structure, allows a charge to be carried
alkene? double bonds. unsaturated
concentration the amount of a substance
Created by: CBA



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