National 5 Chemistry Unit 3 Definitions - from SQA Spec

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Metallic Bonding

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The electrostatic force of attraction between positively charged ions and delocalised electrons.

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Electrolysis

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The decomposition of an ionic compound into its elements using electricity. A d.c supply must be used if the products are to be identified.

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Electrolyte

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Electrically conducting solutions containing ions.

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Ion Bridge

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Used to link half-cells. Ions can move across the bridge to complete an electrical circuit.

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Polymer

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Long chain molecule formed by joining together a large number of small molecules called monomers.

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Monomer

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Small molecules that join together to form a polymer.

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Addition Polymerisation

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Chemical reaction where unsaturated monomers are joined, forming a polymer.

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Fertilisers

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Substances which restore elements, essential for healthy plant growth, to the soil (NPK).

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Haber Process

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H - Haber A - Ammonia is produced I - Iron catalyst R - Reversible reaction

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Ostwald Process

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O - Ostwald P - Platinum Catalyst E - Exothermic Reaction N - Nitric Acid is made