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- 1. Multiple Choice
In which changes do the particles move further apart?
W and X
W and Z
X and Y
Y and Z
- 2. Multiple Choice
Which change of state takes place during evaporation?
gas to liquid
liquid to gas
liquid to solid
solid to gas
- 3. Multiple Choice
A sugar cube is dropped into a hot cup of tea.
The tea is not stirred.
Which statement explains why the tea becomes sweet?
The heated water molecules penetrate the sugar cube.
The hot tea causes the sugar to melt.
The sugar cube dissolves and its molecules diffuse.
The sugar molecules get hot and evaporate.
- 4. Multiple Choice
Which statement is an example of diffusion?
A kitchen towel soaks up some spilt milk.
Ice cream melts in a warm room.
Pollen from flowers is blown by the wind.
The smell of cooking spreads through a house.
- 5. Multiple Choice
A few drops of perfume were spilt on the floor. A few minutes later the perfume could be smelt a few metres away.
Which two processes had taken place?
distillation and condensation
distillation and diffusion
evaporation and condensation
evaporation and diffusion
- 6. Multiple Choice
‘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
- 7. Multiple Choice
In which substance are the particles close together and slowly moving past each other?
air
ice
steam
water
- 8. Multiple Choice
The diagram shows how the molecules in the exhaust gases diffuse into the air.
Which statement describes what happens to these molecules next?
The molecules fall to the ground because they are heavier than air molecules.
The molecules go back together as they cool.
The molecules spread further into the air.
The molecules stay where they are.
- 9. Multiple Choice
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.
- 10. Multiple Choice
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.
- 11. Multiple Choice
Small crystals of purple KMnO4 (Mr = 158) and orange K2Cr2O7 (Mr = 294) were placed at the
centres of separate petri dishes filled with agar jelly. They were left to stand under the same
physical conditions.
After some time, the colour of each substance had spread out as shown.
The lengths of the arrows indicate the relative distances travelled by particles of each substance.
Which statement is correct?
Diffusion is faster in dish 1 because the mass of the particles is greater.
Diffusion is faster in dish 2 because the mass of the particles is greater.
Diffusion is slower in dish 1 because the mass of the particles is smaller.
Diffusion is slower in dish 2 because the mass of the particles is greater.
- 12. Multiple Choice
Pure water has a boiling point of 100 °C and a freezing point of 0 °C.
What is the boiling point and freezing point of a sample of aqueous sodium chloride?
boiling point / °C 98. freezing point / °C. –2
boiling point / °C 98. freezing point / °C. 2
boiling point / °C 102 freezing point / °C. –2
boiling point / °C 102 freezing point / °C. 2
- 13. Multiple Choice
Which process causes the greatest increase in the distance between particles?
condensation
freezing
melting
sublimation
- 14. Multiple Choice
Which statement describes sublimation?
Particles moving slowly past each other speed up and move further apart.
Particles vibrating next to each other become mobile and move slowly past each other.
Particles vibrating next to each other start to move rapidly and move further apart.
Rapidly moving particles slow down and move closer together.
- 15. Multiple Choice
The apparatus shown is set up. After 20 minutes a white ring of ammonium chloride is seen at
position Y.
Which statement about the molecules of ammonia and hydrogen chloride is correct?
Molecules in ammonia have a larger Mr than molecules of hydrogen chloride and so they
move more slowly.
Molecules in ammonia have a larger Mr than molecules of hydrogen chloride and so they
move more quickly.
Molecules in ammonia have a smaller Mr than molecules of hydrogen chloride and so they
move more slowly.
Molecules in ammonia have a smaller Mr than molecules of hydrogen chloride and so they
move more quickly.
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