IGCSE Coordinated Chemistry Workout 34

Which statement describes the structure of sodium chloride?

• contains alternating positive and negative ions

• contains an irregular arrangement of ions

• contains positive ions only

• is a giant covalent structure

Nickel is a transition metal. Five statements about nickel are listed.

1 It is a good conductor of electricity.

2 It has a low melting point.

3 It is shiny.

4 It forms coloured compounds.

5 It does not act as a catalyst.

Which three statements about the properties of nickel are correct?

• 1, 2 and 3

• 1, 3 and 4

• 1, 3 and 5

• 1, 4 and 5

Which row shows a chemical test for the presence of water?

• A

• B

• C

• D

Modern cars are fitted with catalytic converters to reduce the pollution of the atmosphere. Which words complete gaps 1, 2 and 3?

Carbon monoxide is produced by the ..1.. combustion of petrol. Nitrogen monoxide is produced in the car engine.

The nitrogen monoxide is ..2.. by the carbon monoxide in the catalytic converter to produce ..3.. .

• A

• B

• C

• D

Which statement about the products of the fractional distillation of petroleum is not correct?

• Fractions obtained from high up the fractional distillation column contain small molecules.

• Fractions obtained from low down the fractional distillation column have low boiling points.

• Large molecules have large intermolecular attractive forces.

• Refinery gas is used for cooking and heating.

What is the structure of poly(ethene) and what type of polymerisation is used to make it?

• A

• B

• C

• D

Which substances exist as covalent molecules?

• chlorine and helium

• chlorine and ethanol

• helium and sodium chloride

• ethanol and sodium chloride

Which row describes the properties of a covalent compound?

• A

• B

• C

• D

A model of a molecule is shown. Which row shows the formula of this molecule and describes the type of bonding between the atoms?

• 2BH₃ and covalent

• 2BH₃ and ionic

• B₂H₆ and covalent

• B₂H₆ and ionic

Apparatus used to electrolyse aqueous copper chloride is shown. Which words complete gaps 1 and 2?

The negative electrode is called the ..1.. . Gas X turns damp red litmus paper ..2.. .

• 1 = anode and 2 = blue

• 1 = anode and 2 = white

• 1 = cathode and 2 = blue

• 1 = cathode and 2 = white