seperating metals from metal oxides

Question 1

what is it called when metals react with oxygen to make oxides

Answer 1

oxidation

Question 2

what is it called when a reaction separates a metal from its oxide

Answer 2

reduction reaction

Question 3

what is the formation of metal ores

Answer 3

oxidation = gain of oxygen
E.g. magnesium is oxidised to make magnesium oxide

Question 4

what is the extraction of metal

Answer 4

reduction = loss of oxygen
E.g. copper oxide is reduced to copper

Question 5

how are some metals extracted from their ores chemically by reduction using carbon

Answer 5

in this reaction, the ore is reduced as oxygen is removed from it, and carbon gains oxygen so is oxidised

Question 6

how can metals above carbon in the reactivity series be extracted

Answer 6

by using electrolysis

Question 7

how can metals below carbon in the reactivity series be extracted

Answer 7

reduction using carbon
for example, iron oxide is reduced in a blast furnace to make iron
this is because carbon can only take the oxygen away from the metals which are less reactive than carbon itself

Question 8

write a balanced equation for the reduction of zinc oxide, ZnO, by carbon

Answer 8

2ZnO + C – 2Zn + CO2