Rusting

Question 1

What does rust do to steel

Answer 1

Makes it flakey, dangerous and weak

Question 2

What is silica gel used for

Answer 2

Absorbs water from the atmosphere

Question 3

What is steel made from

Answer 3

Iron and carbon

Question 4

Why would a car not rust in the desert

Answer 4

The atmosphere is very dry

Question 5

Why was there not as much rust on the titanic wreckage as expected

Answer 5

Very little air dissolved in water that deep

Question 6

How do u prevent rust on ships

Answer 6

Paint it every 2 yrs

Question 7

Why is gold not a good alternative to steel

Answer 7

Too soft and expensive

Question 8

Does stainless steel rust

Answer 8

No

Question 9

How is stainless steel made

Answer 9

Made by adding small amounts of chromium

Question 10

When do we use aluminium

Answer 10

When making objects were weight is the main consideration

Question 11

What is copper used for

Answer 11

Water pipes

Question 12

What is the chemical name for rust

Answer 12

Hydrated iron (iii) oxide

Question 13

What are 2 conditions required for rusting

Answer 13

Oxygen and water

Question 14

4 methods used to prevent iron from rusting

Answer 14

Painting/oiling
Plastic coating
Galvanising
Sacrificial protection

Question 15

How does a plastic coating work

Answer 15

Prevents air and moisture reaching the iron

Question 16

What is galvanising

Answer 16

When iron objects are coated with a more reactive metal

Question 17

What are 2 metals that can be used to galvanise iron

Answer 17

Zinc and chromium

Question 18

What is the cheapest method of preventing rust

Answer 18

Painting or oiling

Question 19

What is 1 example of sacrificial protection used

Answer 19

Attaching zinc bars to ships

Question 20

Best way to prevent rust on a gate

Answer 20

Painting

Question 21

Best way to prevent rust on a hull of a ship

Answer 21

Sacrificial protection

Question 22

Best way to prevent rust on a machinery

Answer 22

Oiling

Question 23

Best way to prevent rust on an iron nail

Answer 23

Galvanising

Question 24

Native meaning?

Answer 24

Uncombined

Question 25

Why does gold occur native whereas zinc doesn’t

Answer 25

Gold is an unreactive metal that doesn’t get easily oxidised

Question 26

Why was silver used to make coins in the past

Answer 26

Silver is a less reactive metal and don’t undergo corrosion easily

Question 27

Why is copper used to make electrical cables and wires

Answer 27

It has high electrical conductive, inexpensive, ductile and thermal resistant

Question 28

Why do we know so little about the lifestyles of the people in the Iron Age

Answer 28

Iron rusts really quickly (disintegrates)

Question 29

What is the name of the process when a shiny metal becomes dull when left in air

Answer 29

Oxidation

Question 30

Conditions required for rusting to occur

Answer 30

Oxygen + water

Question 31

Which metal is used for plumbing

Answer 31

Copper

Question 32

Why is metal used for plumbing

Answer 32

Metal is highly corrosion resistant in most underground evironments