End Of Unit Questions

Question 1

Why is gold often found in the earth as the metal?

Answer 1

It is very unreactive

Question 2

What are the typical properties of transition metals?

Answer 2

• strong
• hard
• dense
• high bp/mp’s
• malleable
• ductile
• conducts electricity
• solid at room temp

Question 3

Explain why most of the metals we use are not pure elements

Answer 3

They are too soft and are easily bent out of shape

Question 4

Write a word equation of a reaction that is used to to get iron from iron oxide

Answer 4

Iron oxide + carbon –(heat)–> iron + carbon dioxide

Question 5

Name three types of steel and give an important property of each one

Answer 5

Low carbon steel: easily shaped
High carbon steel: hard
Stainless steel: doesn’t corrode

Question 6

Explain why all steels are alloys

Answer 6

They all contain mixtures of iron and carbon and other elements including carbon

Question 7

Give three properties that make aluminium a useful metal

Answer 7

• low density
• strong
• doesn’t corrode
• good conductor of heat and electricity
• malleable

Question 8

Give three reasons why titanium is expensive

Answer 8

• requires a lot of electricity
• there are lots of steps
• cannot be extracted using carbon

Question 9

Suggest three reasons why we should recycle iron and steel

Answer 9

• it can be reused so we don’t have to extract more
• this means we don’t waste as much of the metal ores
• this saves electricity for extracting the metals
• which saves fossil fuels to supply the electricity
• reduces waste going to landfill

Question 10

Name 3 methods that can extract copper from low grade ores

Answer 10

• smelting
• phytomining
• bioleaching

Question 11

Balance this equation:

Fe2O3 + C –> Fe + CO2

Answer 11

2Fe2O3 + 3C –> 4Fe + 3CO2

Question 12

Balance this equation:

Na + TiCl4 –> Ti + NaCl

Answer 12

4Na + TiCl4 –> Ti + 4NaCl

Question 13

What is the name given for rock that is mined from which metal can be extracted economically?

Answer 13

Ore