Using Resources

Question 1

Properties of materials

Answer 1

Ceramics (glass and clay ceramics)- insulators of heat and electricity, brittle and stiff.
Polymers- insulators of heat and electricity, can be flexible, easily moulded.
Composites- depends on the matrix/ binder used to make them.
Metals- malleable, good conductors of heat and electricity, ductile, shiny and stiff.

Question 2

Corrosion

Answer 2

1) if you put an iron nail in a boiling tube with just water, it won’t rust. (The water is boiled to remove oxygen and oil is used to stop air getting in.
2) if you put an iron nail in a boiling tube with just air, it won’t rust. (Calcium chloride can be used to absorb any water from the air.)
3) However, if you put an iron nail in a boiling tube with air and water, it will rust.