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- 1. Multiple Choice
The particles of a substance gain energy and change from a regular ordered structure to a disordered structure with large distances between the particles. Which change of state is described?
boiling
evaporation
melting
sublimation
- 2. Multiple Choice
In which changes do the particles move further apart?
W and X
W and Z
X and Y
Y and Z
- 3. Multiple Choice
The diagram shows a sugar lump in a cup of tea. Which two processes must happen to spread the sugar evenly in the tea?
First process: diffusion; Second process: dissolving
First process: dissolving; Second process: diffusion
First process: dissolving; Second process: melting
First process: melting; Second process: diffusion
- 4. Multiple Choice
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
- 5. Multiple Choice
The diagram shows a cup of tea. Which row describes the water particles in the air above the cup compared with the water particles in the cup?
Moving faster = yes; Closer together = yes
Moving faster = yes; Closer together = no
Moving faster = no; Closer together = yes
Moving faster = no; Closer together = no
- 6. Multiple Choice
Which diagram shows the process of diffusion?
A
B
C
D
- 7. Multiple Choice
The diagrams show the arrangement of particles in three different physical states of substance X. Which statement about the physical states of substance X is correct?
Particles in state 1 vibrate about fixed positions.
State 1 changes to state 2 by diffusion.
State 2 changes directly to state 3 by condensation.
The substance in stage 3 has a fixed volume.
- 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 yellow precipitate is formed in the experiment shown. How is the precipitate formed?
Particles collide, diffuse and then react.
Particles collide, react and then diffuse.
Particles diffuse, collide and then react.
Particles diffuse, react and then collide.
- 10. Multiple Choice
When there is no wind, the scent of flowers can be detected more easily on a warm evening than on a cold evening. This is because the molecules of the scent ……1…… ……2…… than in colder conditions. Which words correctly complete gaps 1 and 2?
A
B
C
D
- 11. Multiple Choice
‘Particles moving very slowly from an area of higher concentration to an area of lower concentration.’ Which process is being described?
a liquid being frozen
a solid melting
a substance diffusing through a liquid
a substance diffusing through the air
- 12. Multiple Choice
Which change of state takes place during evaporation?
gas to liquid
liquid to gas
liquid to solid
solid to gas
- 13. 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.
- 14. Multiple Choice
An attempt was made to compress a gas and a solid using the apparatus shown. Which substance would be compressed and what is the reason for this?
Substance = gas; reason = the gas particles are close together
Substance = gas; reason = the gas particles are far apart
Substance = solid; reason = the gas particles are close together
Substance = solid; reason = the gas particles are far apart
- 15. Multiple Choice
What are the processes W, X, Y and Z in the following diagram?
W = condensing; X = boiling; Y = freezing; Z = melting
W = condensing; X = freezing; Y = melting; Z = boiling
W = melting; X = boiling; Y = freezing; Z = condensing
W = melting; X = freezing; Y = condensing; Z = boiling
- 16. Multiple Choice
In which substance are the particles close together and slowly moving past each other? Which statement must be correct?
air
ice
steam
water
- 17. Multiple Choice
Aqueous lead(II) nitrate and aqueous potassium iodide are added to a dish containing water, as shown. A yellow precipitate forms after a few minutes. Which process occurs before the precipitate forms?
diffusion
distillation
fermentation
filtration
- 18. Multiple Choice
In which substance are the particles furthest apart at room temperature?
ethanol
methane
salt
sugar
- 19. Multiple Choice
Oxides of nitrogen from car exhausts can spread through the atmosphere. This occurs because gas molecules move from a region of ……1…… concentration to a region of ……2…… concentration by a process called ……3…… . Which words correctly complete the gaps?
1 = high; 2 = low; 3 = diffusion
1 = high; 2 = low; 3 = evaporation
1 = low; 2 = high; 3 = diffusion
1 = low; 2 = high; 3 = evaporation
- 20. Multiple Choice
In which change of state do the particles become more widely separated?
gas to liquid
gas to solid
liquid to gas
liquid to solid
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