CHEMISTRY (MYE - REVISION)

In which changes do the particles move further apart?

• W and X

• W and Z

• X and Y

• Y and Z

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

What happens to particles when energy is added (heated)?

• They speed up and spread out

• They stop moving

• They slow down and compress

• They move closer together and speed up

What line segment represents only the solid state?

• A-B

• C-D

• B-C

• D-E

The graph shows a cooling curve for an unknown substance.  What is happening during segment DE?

• boiling

• condensation

• freezing

• melting

Diffusion can only occur in...

• solids, liquids and gases

• solids and liquids

• liquids and gases

• gases and solids

How does increasing temperature affect the rate of diffusion?

• molecules move in orderly manner

• Gives molecules more energy increasing the rate

• Takes energy away from molecules slowing down the rate

• collision of molecules slows down

A blue solid, X, is soluble in water.

Which method is used to obtain pure solid X from an aqueous solution?

• chromatography

• crystallisation

• filtration

• neutralisation

Which two methods can be used to separate a salt from its solution in water?

• 1 and 2

• 1 and 3

• 2 and 3

• 3 and 4

This method is used to separate a mixture of liquids.

• crystallisation

• chromatography

• filtration

• fractional distillation