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Intermediate 1 Unit 2a Metals 1 23 4567 89 10 111213 14 15 22 23242526 27 161718192021
Name some metals found uncombined in the Earth’s crust Gold, silver and copper
Are most metals found combined to other elements or uncombined? Combined to other elements
How is iron extracted from its ore? Heated with carbon
Name a metal extracted from its ore using electricity. Aluminium
Which type of elements are conductors of electricity? Metals
Which non-metal element conducts electricity? Carbon (graphite)
What is an insulator of electricity? A substance which does not allow electricity to pass through it
What is an alloy? A mixture of metals or a mixture of metals with non-metals.
Give three examples of an alloy. Brass, bronze, solder, steel
What is produced in the reaction of a metal with oxygen? A metal oxide
Which gas is produced when a metal reacts with acid? Hydrogen gas
Name three metals which do not react with dilute acid. Gold silver and copper
What is the test for hydrogen gas? Burns with a pop
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
Why is aluminium used for aircraft bodies? (Use data booklet) Low density/ not heavy
What term is used to describe the corrosion of iron? Rusting
Name the two conditions needed for rusting. Water and oxygen
What can be used to show the extent of the rusting process? Rust indicator turns blue
Do acid rain and salt speed up or slow down the rusting process? Speed it up
Give four examples of surface barriers which can be used to protect against corrosion. Painting, greasing, electroplating, galvinising, tin-plating, plastic coating.
Which metal is used to galvanise iron? Zinc
How do surface barriers protect against corrosion? They stop the water and oxygen making contact with the iron
Which metal is anodised? Aluminium
Would iron rust if attached to attaching magnesium (more reactive metal)? No
Would iron rust if a tin coating was scratched? Yes - tin is less reactive than iron
Would iron rust if a zinc coating was scratched? No -zinc is more reactive than iron
What happens to the oxide layer when aluminium is anodised? It becomes thicker
Intermediate 1 Unit 2a 123 4567 89 10 111213 14 15 22 23242526 27 161718192021
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