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why do some ores have to be concentrated before the metal is extracted?

what other things can electrolysis do?

what is used in reduction?

what is removed when the ore is reduced?

what does the reactivity series do?

if metals are higher than carbon then what does this mean?

if metals are lower than carbon then what does this mean

what's the order of the reactivity series?

complete the word equation: iron oxide + carbon-