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level: Extraction

Questions and Answers List

level questions: Extraction

Question	Answer
what happens to negative non metal ions at the positive electrode	they lose electrons and are oxidised
What is a reduction reaction?	A gain of electrons by a reactant in any chemical reaction
A compound reacting to form a metal element is an example of what type of reaction?	reduction
where are electrons found in a written reduction reaction?	before the arrow
what is an oxidation reaction	loss of electrons by a reactant in any chemical reaction
a metal element reacting to form a compound is an example of what type of reaction?	oxidation
where are electrons found in a written oxidation reaction?	after the arrow
what is a redox reaction	reaction in which reduction and oxidation take place at the same time
What happens to metal ions during the extraction of metals?	metal ions are reduced forming metal atoms
How are the least reactive metals obtained eg silver gold platinum mercury	heat alone
how are metals with medium reactivity obtained? eg copper, lead, tin, iron, zinc	heating with carbon or carbon monoxide
how are the most reactive metals obtained? eg potassium, sodium, lithium, calcium, magnesium, aluminium	molten electrolysis of metal compounds
what is electrolysis?	the decomposition of an ionic compound into its elements using electricity
what type of power supply must be used for electrolysis	a d.c power supply in order for the products to be identified
what is an electrolyte?	an ionic compound that conducts electricity when molten or in solution
what happens to positive metal ions at the negative electrode	they gain electrons and are reduced
what happens to negative non metal ions at the positive electrode	they lose electrons and are oxidised