Metals and their uses

Question 1

An ore is…

Answer 1

…a substance containing enough metal to make it economical to extract.

Question 2

After an ore is mined it may be…

Answer 2

…concentrated before being purified.

Question 3

Unreactive metals such as gold may be found in the Earth in which state?

Answer 3

Their native state.

Question 4

Most metals are found in compounds in the Earth meaning they must be extracted by…

Answer 4

…chemical reactions.

Question 5

Metals less reactive than carbon may be extracted by…

Answer 5

…reduction with carbon in a blast furnace. Eg: Iron Oxide is reduced to make Iron.

Question 6

Metals more reactive than Carbon must be extracted by…

Answer 6

…electrolysis of the molten compounds.

Question 7

Copper is extracted how?

Answer 7

Smelting of the ore, then use of electrolysis to purify.

Question 8

True or false. The supply of copper rich ores is limited.

Answer 8

True.

Question 9

Copper can be extracted from low-grade ores how?

Answer 9

Phytomining and bioleaching.

Question 10

What is phytomining?

Answer 10

The growing of plants on an area of low grade copper ore and the burning to produce metal compounds.

Question 11

What is bioleaching?

Answer 11

The use of bacteria to produce leachate solutions that contain metal compounds.

Question 12

Copper can be obtained from copper salt solutions using…

Answer 12

…a displacement reaction with scrap iron or electrolysis.

Question 13

Extraction of aluminium and titanium is expensive because…

Answer 13

they cannot be removed from their oxides by education with carbon.

Question 14

Why should we recycle metals?

Answer 14

There are limited resources and extraction is expensive in terms of energy and effects upon the environment.

Question 15

Iron from the blast furnace is 96% pure with the impurities making it…

Answer 15

…brittle giving it limited uses.

Question 16

Most iron is converted to which metal?

Answer 16

Steel, by mixing it with carbon.

Question 17

Low carbon steels have which property?

Answer 17

Easily shaped (malleable).

Question 18

High carbon steels have which property?

Answer 18

They are hard.

Question 19

Stainless steels have which property?

Answer 19

Resistant to corrosion.

Question 20

Examples of metals mixed with small amounts of similar metals to make them useful in everyday life include…

Answer 20

…pure copper, gold, iron and aluminium because they are all too soft.

Question 21

Elements in the central block of the periodic table are known as what types of metals?

Answer 21

Transition metals.

Question 22

Copper has properties that make it good in which industries?

Answer 22

Electrical works and plumbing.

Question 23

Aluminium and titanium are useful metals why?

Answer 23

Low density and resistance to corrosion.