1. Metals that are more reactive than carbon, such as aluminium are extracted by?
- Reduction by iron
- Reduction by carbon
- Reduction by oxygen
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2. Metals that are less reactive than carbon can be extracted from their oxides by?
- Reduction with oxygen
- Reduction with carbon
3. What is the definition of an ore?
- An ore is the product of a reaction
- An ore is an unreactive metal
- An ore contains enough metal to make it economic to extract the metal
- An ore is a mixture of metals
4. What must happen to ores before the metal is extracted and purified?
- The ore must become less dense
- The ore must be mined and concentrated
- The ore must have more metals added to it
- The ore must be put in a catalyst