Chemistry

Typical properties of a transition metal = used as catalyst, high density, coloured

Explain how lubricating the chain with oil prevents corrosion of the steel chain.

Lubricating the chain with oil will prevent corrosion as the oil acts as a wall to the steel, therefore, substances like water will not act towards the corrosion.

Iron fences can be galvanized by coating them with a layer of zinc. When the layer of zinc is scratched exposing the iron to the weather, the iron does not rust.

Explain why the exposed iron does not rust.

Zinc is more reactive than iron, so it will lose electrons and corrode in preference to iron. The iron doesn't rust because the zinc acts as a barrier.

 Explain, in terms of their structure and bonding, why metals have high melting points

They have strong electrostatic forces which need lots of energy…