1. Metals that are more reactive than carbon, such as aluminium are extracted by?
- Reduction by carbon
- Reduction by oxygen
- Reduction by iron
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2. During electrolysis the positive metal ions move towards the negative electrode. Why does this happen?
- Because opposite charges attract
- Because of the delocalised electrons
- Due to photosynthesis
- Due to the negative sea of electrons
3. What can be obtained from solutions of copper salts by electrolysis or by displacement using scrap iron?
4. Why are alloys stronger than pure metals?
- A pure metal is unreactive
- Alloys are less dense compared to pure metals
- The metals are different sizes and therefore the layers cannot slide over each other
- Some metals in the alloy are stonger than others compared to a pure metal
5. Pure copper, gold, iron, aluminium are too soft, what are these metals mixed with to make them harder?
- Bigger amounts of a range of metals
- Small amounts of similar metals
- Small amounts of a range of metals
- Bigger amounts of similar metals