MIS-EXM4-23-VS5-CM-1.1

In which process do particles move closer together but remain in motion?

• condensation
• diffusion
• evaporation
• freezing

A crystal of purple potassium manganate(VII) was added to each of the beakers shown in the diagram.

• A
• B
• C
• D

Two gas jars each contain a different gas. The gas jars are connected and the cover slips are removed. The diagram shows what happens to the particles of the gases. Which process has occurred?

• chemical reaction
• condensation
• diffusion
• evaporation

A liquid is heated until it boils. Which result shows that the liquid in the test-tube is pure water?

• Condensation forms at the top of the test-tube.
• Steam is produced.
• The thermometer reads 100°C.
• There is nothing left behind in the test-tube.

An attempt was made to compress a gas and a solid using the apparatus shown.

• A
• B
• C
• D

A gas jar of bromine vapour and a gas jar of air are set up as shown in diagram 1. The glass slide is removed. Diagram 2 shows the appearance of the gas jars after one hour. Which statement explains why the bromine and air mix together?

• Bromine is denser than air.
• Bromine is lighter than air.
• Bromine molecules moved upwards and molecules in air moved downwards.
• Molecules in bromine and air moved randomly.

The diagram shows a cup of tea.

• A
• B
• C
• D

What are the processes W, X, Y and Z in the following diagram?

• A
• B
• C
• D

‘Particles moving very slowly from an area of high concentration to an area of low concentration.’ Which process is being described above?

• a liquid being frozen
• a solid melting
• a substance diffusing through a liquid
• a substance diffusing through the air

Which diagram shows the process of diffusion?

• A
• V
• C
• D