IGCSE Coordinated Chemistry Workout 21

Dye X is a mixture of different coloured substances.

Chromatography is used to compare X with three other mixtures, P, Q and R.

The results are shown in the diagram.

Which other mixtures contain the dye X?

• P only

• R only

• P and Q only

• P, Q and R

Which process can be used to produce sodium and chlorine from the compound sodium chloride?

• cracking

• distillation

• electrolysis

• filtration

Water can be separated from copper sulfate solution using the apparatus shown.

What is the name of the process?

• chromatography

• filtration

• distillation

• crystallisation

Which statement describes the particles in a gas?

• As the particles move quicker the pressure of the gas decreases.

• The movement of the particles is unaffected by temperature.

• The particles are in random motion.

• The particles are ordered.

Sodium chloride (salt) has an ionic structure.

Which compound could be sodium chloride?

• A

• B

• C

• D

When a match is struck, heat and light energy are produced.

Which row describes the type of change and the type of reaction taking place?

• A

• B

• C

• D

Metal X is extracted from its oxide by heating with carbon. The oxide of X reacts with hydrochloric acid.

Which row shows the type of oxide and the type of reaction that occurs to the oxide when it is heated with carbon?

• A

• B

• C

• D

Which statement about the trends in the Periodic Table is correct?

• Elements are arranged in order of nucleon number.

• Elements on the left hand side form acidic oxides.

• The melting point of the Group I elements increases down the group.

• The proton number increases from left to right across the table.

The first row of the transition elements is shown.

Which statement about transition metals is not correct?

• They are often used as catalysts.

• They form colourless compounds.

• They have high densities.

• They have high melting points.

The structures of compounds X and Y are shown.

What are the correct formulae for these two compounds?

• X is C₆H₁₄; Y is C₆H₁₀

• X is C₆H₁₄; Y is C₆H₁₂

• X is C₆H₁₂; Y is C₆H₁₀

• X is C₆H₁₂; Y is C₆H₁₂