Kinetic Particle Theory Revision

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

In which changes do the particles move further apart?

• W and X

• W and Z

• X and Y

• Y and Z

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

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

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

Which diagram shows the process of diffusion?

• A

• B

• C

• D

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.

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.

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.

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