Which metal in the table is the most suitable to make the structural frames of high-speed passenger trains? Explain your answer using information from the table.

Bronze is an alloy of copper. Which metal is mixed with copper to make bronze?

A student investigates the conditions required for iron wool to rust. They set up three test tubes:

• Tube A: Dry iron wool in a sealed test tube containing anhydrous calcium chloride (a drying agent).
• Tube B: Iron wool completely submerged in boiled water, with a layer of liquid paraffin (oil) poured on top.
• Tube C: Iron wool partially submerged in tap water, open to the air.

Predict which tube will contain rusted iron wool after one week. Explain your answer by referencing the conditions present or absent in each of the three tubes.

State and explain one method used to prevent the iron hull of a marine cargo ship from rusting.