10.08.7 KEYWORDS

· Reactivity of metal – Tendency of a metal to form positive ions {reactive metals form ions easily (eg Caesium), Unreactive metals don’t (eg Gold)}

· Reactivity Series – List of metals in order of reactivity, most reactive at top

· Displacement – a metal taking the place of a different metal in a compound

· OILRIG – stands for “Oxidation Is Loss, Reduction Is Gain” of electrons

· Smelting – method to extract an unreactive metal from a compound by heating with Carbon

· Ore – rock containing useful amount of a metal compound

· Electrolysis – breaking up a compound using electricity (used to extract reactive metals from their ores)

· Corrosion – the “eating away” of metals by Oxygen and Water

· Rusting – the corrosion of Iron & Steel

· Barrier protection – stopping rusting by coating with unreactive substance (paint, grease, unreactive metal)

· Electroplating – covering a metal with another metal by electrolysis

· Galvanising – stopping rusting by coating with Zinc

· Sacrificial Protection – Stopping rusting by providing nearby zinc for water/air to react with

· Carat – Gold purity measure (24 carat = 24/24 parts Gold = 100%; 12 carat = 12/24 parts Gold = 50%)