Iron And Rust (2)

Question 1

When _________ or an alloy of __________ such as __________ corrode they make rust

Answer 1

Iron
Iron
Steel

Question 2

The word “rust” is only used for the corrosion of _________, not other metals

Answer 2

Iron

Question 3

The chemical reactions that take place when iron corrodes is an ______________ reaction. The iron __________ oxygen to form iron (3) oxide. Water then becomes loosely ____________ to the iron (3) oxide and the result is _________________ iron (3) oxide which we call ________

Answer 3

Oxidation reaction
Gains
Bonded
Hydrated iron (3) oxide
Rust

Question 4

Word equation for rust

Answer 4

Iron + Oxygen + Water —> Hydrated Iron(3) oxide (rust)

Question 5

Unfortunately, rust is a soft crumbly solid that soon flakes off to leave more __________ available to rust again

Answer 5

Iron

Question 6

How to prevent rusting

Answer 6

Coat the iron with a barrier to keep out the water and oxygen
Or place a more reactive metal with the iron so that the oxygen reacts with that instead

Question 7

What barrier is often used to prevent rusting

Answer 7

Painting/coating with plastic

Oiling/greasing

Question 8

When is painting/coating used to prevent rusting

Answer 8

For any size structures

Question 9

When is oiling/greasing used to prevent rusting

Answer 9

This is used when moving parts are involved, like on bike chains

Question 10

What is the common sacrificial metal

Answer 10

Zinc

Question 11

A coat of zinc can be sprayed onto an object - this is known as ______________

Answer 11

Galvanising