Topic 5b Transition metals and alloys
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1 Which are usually good conductors of electricity, metals or non-metals?
metals
2 What can you say about the melting points of metals compared with non-metals?
They are high.
3 Are most metals shiny or dull when freshly cut?
shiny
4 Why do lumps of most metals sink in water?
They have high densities/are denser than water.
5 What gas is produced when a metal reacts with an acid?
hydrogen
6 What catalyst is used in the Haber process?
iron
7 What orange-brown substance is formed when iron reacts with air and water?
rust/hydrated iron(III) oxide
8 What happens to the mass of a catalyst when it catalyses a chemical reaction?
It stays the same.
9 The melting point of a substance is 39 °C and its boiling point is 356 °C. What is its state at room temperature?
liquid (it has melted but it hasnt yet boiled)
10 What non-metal element is used to extract iron from iron ore?
carbon
11 In which part of the periodic table is iron placed?
transition metals
12 What can you say about the melting point of a typical transition metal?
It is high.
13 What is oxidation?
gain of oxygen/loss of electrons
14 What colour is rust?
brown/orange-brown
15 What gas element is needed for iron to rust?
oxygen
16 What colourless compound is needed for iron to rust?
water
17 Which is more reactive, zinc or iron?
zinc
18 Which is more reactive, copper or iron?
iron
19 Is common salt, sodium chloride, needed for iron to rust?
no
20 When a metal corrodes, is it oxidised or reduced?
oxidised
21 Are metals shiny or dull when freshly cut?
shiny
22 In general, what can you say about the densities of transition metals?
They are high.
23 When metals corrode, are they oxidised or reduced?
oxidised
24 What two substances are needed for iron to rust?
oxygen/air and water