This question is about the corrosion of metals and methods used to prevent it.
a.[3]
A student investigated the environmental factors necessary for the corrosion of iron by setting up three distinct test environments using iron filings, as shown in the diagram:
Explain what would happen to the iron filings in each of the three test tubes after one week.
b.[2]
Magnesium blocks (sacrificial anodes) are often connected to underground steel pipelines or domestic hot water boilers.
Explain how this prevents the steel from rusting.
c.[2]
Although titanium is highly reactive and sits high in the electrochemical series, titanium structural panels do not corrode when exposed to water and air.
Explain why.