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%)