C20 Making Our Resources

Question 1

Describe 2 ways to stop corrosion

Answer 1

• Physical barriers - Coating a corrodible material with a barrier such as paint or grease
• Sacrificial protection - A more reactive substance is placed on the corrodible material to stop the protected material from reacting

Question 2

What 2 conditions must be met for rust to occur

Answer 2

• Oxygen present
• Water present

Question 3

What metal does rust occur in

Answer 3

Iron

Question 4

Galvanisation is an example of what type of corrosion defence method

Answer 4

Sacrificial protection - Iron is galvanised in zinc

Question 5

Properties of high carbon steel

Answer 5

Strong but brittle

Question 6

Properties of low carbon steel

Answer 6

Soft, easy to shape

Question 7

Properties of brass

Answer 7

Very hard but workable

Question 8

Properties of bronze

Answer 8

Resistant to corrosion

Question 9

Properties of stainless steel

Answer 9

Resistant to corrosion, Hard

Question 10

Properties of high aluminium alloys

Answer 10

Low density

Question 11

Composition of high carbon steel

Answer 11

Iron with 1-2% carbon

Question 12

Composition of low carbon steel

Answer 12

Iron with less than 1% carbon

Question 13

Composition of stainless steel

Answer 13

Iron with chromium and nickel

Question 14

Composition of brass

Answer 14

Copper and zinc

Question 15

Composition of bronze

Answer 15

Copper and tin

Question 16

How is soda-lime glass manufactured

Answer 16

A mixture of sand, sodium carbonate and limestone are heated

Question 17

How is borosilicate glass manufactured

Answer 17

A mixture of sand and boron trioxide are heated

Question 18

How is clay ceramics manufactured

Answer 18

Shape wet clay and then heat in a furnace

Question 19

What are the properties of soda-lime glass

Answer 19

Transparent and brittle

Question 20

What are the properties of boronsilicate glass

Answer 20

High melting point, transparent and brittle

Question 21

What are the properties of clay ceramics

Answer 21

Hard, Brittle, easy to shape before manufacturing, resistant to corrosion

Question 22

How is LDPE (Low density poly[ethene]) formed

Answer 22

• Addition polymerisation
• High pressure
• small amount of oxygen

Question 23

How is HDPE (High density poly[ethene]) formed

Answer 23

• Addition polymerisation
• Using a catalyst at 50 degrees celsius

Question 24

What is a thermosoftening polymer

Answer 24

A polymer that softens when heated

Question 25

What is a thermosetting polymer

Answer 25

A polymer that doesn’t soften when heated

Question 26

Difference in structure between thermosoftening polymers and thermosetting polymers

Answer 26

• Thermosoftening polymers have no links between different polymer chains whereas Thermosetting polymers do so do not soften when heated

Question 27

3 conditions used during the manufacturing of ammonia in the haber process

Answer 27

• Iron Catalyst
• 450 degrees celsius
• 200 atmospheres of pressure

Question 28

What type of reaction is the haber process

Answer 28

Reversible reaction

Question 29

What 3 elements should be present in an effective fertiliser

Answer 29

Nitrogen, Phosphorus, Potassium