MYP Chemistry 5.13 Corrosion Questionbank

Magnesium blocks are frequently attached to the hulls of steel ships. In this arrangement, magnesium protects the iron by acting as a(n) __________.

Beyond the cost of the metal itself, what is a major economic impact of corrosion on a national scale?

The mass of rust formed on the nails

The amount of oxygen dissolved in the water

The concentration of the sodium chloride solution

The type of metal used for the nail

Zinc prevents the ship from becoming too heavy

Paint is more expensive than zinc

Paint reacts with saltwater to form acids that accelerate corrosion

Zinc provides electrochemical protection even if the hull's surface is scratched

It contains a high concentration of salt which inhibits redox reactions.

The nickel in the alloy reacts with nitrogen in the air to form a shield.

It is a pure element that does not contain iron.

The addition of chromium allows for the formation of a very thin, stable, and protective oxide layer on the surface.

sacrificial anode

barrier coating

catalyst

oxidizing agent

The reduction in global oxygen levels due to rust formation

The energy cost of mining and refining replacement ores

The increase in the price of plastic as a replacement material

The cost of disposing of excess nitrogen produced during corrosion