8 Metals

Which property do all metals have?

• They are soluble in water.

• They conduct electricity.

• They have high melting points

• They react with dilute sulfuric acid.

Which substance has the properties of a metallic element?

Which diagram represents the structure of a solid alloy?

Answer explanation

Atoms of different size disrupts the orderly arrangement of atoms. Causing layers of atoms to be unable to slide over each other.

Hence they are harder and stronger

Which metal is the most reactive?

• X

• Y

• Z

Answer explanation

X is least reactive a it does not react with water

The metals iron, lead, magnesium and zinc are added to separate samples of dilute hydrochloric acid in test-tubes. Which tbe contains magnesium and dilute hydrochloric acid?

Answer explanation

Mg is more reactive than Zn, iron and lead

Experiments are carried out to arrange metals X, Y and Z in order of reactivity. The table shows the result. Which is the least reactive metal?

• X

• Y

• Z

Answer explanation

Z is the most reactive as it cannot be reduced by heating with carbon.

Which metals can be obtained by heating their oxides with carbon?

• copper

• lead

• magnesium

Answer explanation

magnesium is more reactive than carbon hence it cannot be displaced by heating with carbon.

Which statements about the reasons for recycling metals are correct?

• conserves earth’s ores / metals, as metals are a finite natural resource.

• saves energy / money, as extraction of metals from the ore consumes energy and is expensive.

• limits pollution, as extraction of metal from the ore may release harmful gases into the atmosphere.

Why is limestone used in the extraction of iron?

Iron is extracted from haematite in a blast furnace.

The word equation for the reaction is:

haematite   +   carbon monoxide   →   iron   +   X

What is X?