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

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Presentation transcript:

Intermediate 1 Unit 2a Metals

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