native state - When a metal is found in the Earth as an element., oxidation - Reaction in which a substance gains oxygen., reactivity series - A list of metals that shows them in order of reactivity with the most reactive metal at the top. , rust - A weak, brown, crumbly solid, formed when iron corrodes. (A mixture of oxides and hydroxides of iron including iron hydroxide.) , sacrificial protection - Using a more reactive metal to protect iron from rusting., endothermic reaction - A reaction in which energy is transferred to the reactants from the surroundings. The temperature of the surroundings decreases. , exothermic reaction - A reaction in which energy is transferred from the reactants to the surroundings. The temperature of the surroundings increases. , hydrocarbon - A compound containing hydrogen and carbon only., oxidising agent - A substance that provides oxygen to oxidise another substance. , displace - When one element takes the place of another element in a compound. , displacement reaction - A reaction where a more reactive element takes the place of a less reactive element in a compound. , electrolysis - Breaking down a substance using electricity., mineral - A naturally occurring element or compound that can form distinct grains in rocks. , ore - A rock that contains enough of a certain mineral to make it worth mining. , reduced - If a substance has lost oxygen then it has been reduced. , reducing agent - A substance that removes oxygen from another substance. ,

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