Chemistry unit 2 gcse aqa
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Thermosoftening polymers | forces between chains are easy to overcome. No crosslinks. Can melt +remould these plastics. Weak intermolecular forces
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| Giant covalent structures | all atoms are bonded by strong covalent bonds. v. high melting +boiling points. dont conduct electricity. *Diamond, graphite, silicon dioxide
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| Thermosetting polymers | have crosslinks. holds chains together in a solid structure. the polymer doesnt soften when its heated. they're strong, hard, rigid
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| Properties of metals | high melting +boiling points. Good conductors of heat & electricity (cause of free electrons)
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| Low density polythene | made by heating ethene to 200*c under high pressure. flexible-used for bags n bottles
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| Ionic bonds | metal+non-metal
donating. atoms become ions. high melting n boiling points. dissolve easy in water- carry electric current.
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| High density polythene | made at lower temp +pressure (w/catalyst) more rigid n used for water n drainpipes
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| simple molecular substances | forces of attraction between molecules are v weak. low melting n boiling points. dont conduct electricity.
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| Ion? | when atoms lose or gain electrons. atom becomes charged.
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| convalent bonding | sharing. strongest type of bond. non-metals
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| calculating moles | no. of moles= (g)/Mr
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| alloy? | is a mixture of two or more elements where at least one element is a metal
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| diamond's structure | 4 covalent bonds per carbon atom. the hardest natural substance.
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| compounds? | chemically bonded elements
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| Graphite pro | each carbon forms 3 bonds. creates layers-can slide. making it slippery soft. weak intermolecular forces between layers.
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| isotopes? | different atomic forms of the same element which have the same number of protons but different numbers of neutons.
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| delocalised | where electrons are free to move within structure, allows a charge to be carried
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| alkene? | double bonds. unsaturated
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| concentration | the amount of a substance
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