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Science

Products from rocks

Metals - Test

1.

Why can gold be found in the Earth's crust in its native state?

2.

Why is aluminium extracted from aluminium ore by electrolysis?

3.

Why is iron extracted from iron ore by reduction with carbon or carbon monoxide?

4.

Which properties make aluminium suitable for overhead mains electricity cables?

5.

What happens to iron oxide in a blast furnace?

6.

In comparison with steel, what is pure iron like?

7.

What is the percentage of iron in the iron from a blast furnace?

8.

Which type of steel is likely to be used for making cutlery?

9.

Why are alloys likely to be harder than pure metals?

10.

Transition metals are like other metals in what ways?

11.

What process is used to purify copper?

12.

Why does aluminium not corrode quickly?

13.

Why is titanium expensive to extract from its ore?