What happens to a metal during corrosion?
The metal is oxidised and becomes gradually weaker
The metal is oxidised and becomes gradually stronger
The metal is reduced and becomes gradually weaker
What does iron react with when it rusts?
Oxygen only
Water only
Oxygen and water
What is the chemical name for rust?
Iron hydride
Hydrated iron(III) hydroxide
Iron(II) oxide
Which half equation correctly shows an oxidation reaction of iron during rusting?
Fe→ Fe2+ + e-
Fe2+ = 2e- → Fe
Fe → Fe2+ + 2e-
Which substance is reduced during rusting?
Oxygen
Iron
Hydroxide
Rusting is the term used to describe the corrosion of which metal?
Zinc
Aluminium
How can water be excluded when storing a metal?
Storing the metal in a sealed container with a desiccant.
Storing the object in a sealed container.
Storing the object in an open container with a desiccant.
How can a bicycle chain best be prevented from rusting?
Painting the chain
Coating the chain with plastic
Covering the chain with oil
Which metal may be used in the sacrificial protection of iron?
Copper
Gold
What metal is iron coated with during galvanising?