IGCSE Coordinated Chemistry Workout 2

An ice cube is gently warmed as shown. Which process is taking place?

• Decomposition

• Dissolving

• Boiling

• Melting

A solid has a giant structure. It does not conduct electricity but does so when it is dissolved in water. What could the solid be?

• A

• B

• C

• D

The diagram shows a metal being extracted from its powdered ore. What happens to the ore in this reaction?

• It burns

• It is oxidised

• It is reduced

• It decomposes

Limestone and common salt are important minerals. For which process are both minerals suitable starting materials?

• Manufacture of alkalis

• Manufacture of chlorine

• Manufacture of fertilisers

• Manufacture of hydrogen

A man spills ink on his polyester shirt. The table shows the solubility of ink and of polyester in four solvents. Which solvent should be used to remove the ink?

• A

• B

• C

• D

The table shows the pH values of four solutions. Which solution produces an exothermic reaction when mixed with a dilute acid?

• A

• B

• C

• D

Nitrogen from the air is used to manufacture the fertiliser ammonium sulphate. Why is a catalyst needed during this process?

• Nitrogen from the air is not pure.

• Nitrogen is a gas at room temperature.

• Nitrogen is a non-metallic element.

• Nitrogen reacts slowly.

Which diagram represents an alloy?

• A

• B

• C

• D

A measuring cylinder is used to measure the volume of a liquid. What is the volume of the liquid?

• 43 cm³

• 46 cm³

• 48 cm³

• 54 cm³

In an experiment on rusting, pieces of iron were kept under four different conditions. They were weighed at regular intervals.

• A

• B

• C

• D