4.4.1.3. Extraction of metals

Found as metal in rocks and sediments

• copper

• gold

• lithium

• sodium

Most metals are found in rocks as

• pure elements

• compounds

Metal compounds called ores can only be separated by

• physical methods

• chemical methods

copper oxide and carbon will produce

• no reaction

• carbon oxide and copper

• lead oxide and copper oxide

reduction rections involve a

• loss of oxygen

• gain of oxygen

Lead oxide + carbon --> lead + carbon oxide. The lead oxide has been

• oxidised

• reduced

Lead oxide + carbon --> lead + carbon oxide. The Carbon has been

• oxidised

• reduced

lithium oxide + carbon

• lithium + carbon oxide

• No reaction

Reduction reactions evolves a

• loss of electrons

• gain of electrons

Oxidation reactions involves a

• gain of electrons

• loss of electrons