Improving processes and products - OCR Gateway

1

Why can gold be found uncombined in the Earth's crust?

2

Why is iron extracted from iron ore by heating with carbon?

3

Why is aluminium extracted from aluminium ore by electrolysis?

4

What process is used to purify copper?

5

What is aluminium oxide dissolved in so that electrolysis can be carried out?

6

Which of the following is a disadvantage of recycling metals?

7

What is the main purpose of a life-cycle assessment?

8

What is produced at the cathode during the electrolysis of aluminium oxide?

9

What does phytoextraction involve? - Higher

10

Copper can be obtained by reacting solutions of copper compounds with scrap iron. What is this sort of reaction called? - Higher