The particulate nature of matter

In which changes do the particles move further apart?

• W and X

• W and Z

• X and Y

• Y and Z

Tags

NGSS.MS-PS1-4

Diagrams X, Y and Z represent the three states of matter.

Which change occurs during boiling?

• X to Y

• Y to Z

• Z to X

• Z to Y

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which change of state takes place during evaporation?

• gas to liquid

• liquid to gas

• liquid to solid

• solid to gas

Tags

NGSS.MS-PS1-4

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

• condensation

• diffusion

• evaporation

• freezing

Tags

NGSS.MS-PS1-4

The changes that occur when a substance changes state are shown below.

Which process, W, X, Y or Z, is occurring in the following four situations?

1 Butter melts on a warm day.

2 Water condenses on a cold surface.

3 The volume of liquid ethanol in an open beaker reduces.

4 Ice forms inside a freezer

• 1: W, 2:X, 3:Y, 4:Z

• 1: W, 2:Y, 3:X 4:Z

• 1: X, 2:Y, 3:Z, 4:W

• 1: X, 2:Z, 3:Y, 4:W

Tags

NGSS.MS-PS1-4

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

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.

Tags

NGSS.MS-PS1-2

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.

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

The diagram shows the result of dropping a purple crystal into water.

Which processes take place in this experiment?

• chemical reaction, diffusion, dissolving

• chemical reaction and dissolving

• dissolving only

• diffusing and dissolving