GCSE Chemistry Chapter C5 Chemical Changes Pre Exam Fully Solved 2024.

How metals can be placed in order of reactivity - Answer By their reactions with water and dilute acid When metals react with water or dilute acids - Answer Hydrogen gas is given off. The gas 'pops' with a lighted spill. OIL RIG - Answer oxidation is loss (of electrons), reduction is gain (of electrons) A more reactive metal - Answer Will displace a less reactive metal from its aqueous solution The non-metals hydrogen and carbon - Answer can be given positions in the reactivity series on the basis of displacement reactions Metal ore - Answer Contains enough of the metal to make it economic to extract the metal. Ores - Answer Are mined and might need to be concentrated before the metal is extracted and purified Gold and some other unreactive metals - Answer Can be found in their native state How the reactivity series helps you decide the best way to extract a metal from its ore - Answer The oxides or metals below carbon in the series can be reduced by carbon to give the metal element Metals more reactive than carbon - Answer Cannot be extracted from their ores using carbon. They are extracted by electrolysis of the molten metal compound Salt - Answer A compound formed when there hydrogen isn an acid is wholly or partially replaced by metal or ammonium ions