1. Intermediate 1 Unit 2a Metals 1 23 4567 89 10 111213 14 15 22 23242526 27 161718192021

2. Name some metals found uncombined in the Earth’s crust Gold, silver and copper

3. Are most metals found combined to other elements or uncombined? Combined to other elements

4. How is iron extracted from its ore? Heated with carbon

5. Name a metal extracted from its ore using electricity. Aluminium

6. Which type of elements are conductors of electricity? Metals

7. Which non-metal element conducts electricity? Carbon (graphite)

8. What is an insulator of electricity? A substance which does not allow electricity to pass through it

9. What is an alloy? A mixture of metals or a mixture of metals with non-metals.

10. Give three examples of an alloy. Brass, bronze, solder, steel

11. What is produced in the reaction of a metal with oxygen? A metal oxide

12. Which gas is produced when a metal reacts with acid? Hydrogen gas

13. Name three metals which do not react with dilute acid. Gold silver and copper

14. What is the test for hydrogen gas? Burns with a pop

15. Name a metal which reacts with oxygen but does not react with water. (Use data booklet) Aluminium, zinc, iron, and those below iron in the table in the data booklet

16. Why is aluminium used for aircraft bodies? (Use data booklet) Low density/ not heavy

17. What term is used to describe the corrosion of iron? Rusting

18. Name the two conditions needed for rusting. Water and oxygen

19. What can be used to show the extent of the rusting process? Rust indicator turns blue

20. Do acid rain and salt speed up or slow down the rusting process? Speed it up

21. Give four examples of surface barriers which can be used to protect against corrosion. Painting, greasing, electroplating, galvinising, tin-plating, plastic coating.

22. Which metal is used to galvanise iron? Zinc

23. How do surface barriers protect against corrosion? They stop the water and oxygen making contact with the iron

24. Which metal is anodised? Aluminium

25. Would iron rust if attached to attaching magnesium (more reactive metal)? No

26. Would iron rust if a tin coating was scratched? Yes - tin is less reactive than iron

27. Would iron rust if a zinc coating was scratched? No -zinc is more reactive than iron

28. What happens to the oxide layer when aluminium is anodised? It becomes thicker

29. Intermediate 1 Unit 2a 123 4567 89 10 111213 14 15 22 23242526 27 161718192021