Practice Quiz [Topics 1 and 2]

Four physical changes of ethanol are listed.

1 condensation

2 evaporation

3 freezing

4 boiling

In which changes do the particles move further apart?

• 1 and 2

• 1 and 3

• 2 and 4

• 3 and 4

Rock salt is a mixture of salt and sand. The method used to separate the sand from the salt is listed.

step 1 Crush the rock salt, add to warm water and stir.

step 2 Pour the mixture through a filter paper held in a funnel.

step 3 Evaporate the water to crystallise the salt.

Which statement about the method is correct?

• The filtrate in step 2 is pure water.

• The residue in step 2 is pure crystals of salt.

• The solute is salt.

• The solvent is a mixture of salt and water.

Two compounds, M and N, are dissolved in water and separated by chromatography. The results are shown.

What is the R_f value of M and which compound is most soluble in water?

• R_f = 0. 2

  Most soluble = M

• R_f = 0. 2

  Most soluble = N

• R_f = 5.0

  Most soluble = M

• R_f = 5.0

  Most soluble = N

The chromatogram obtained from a chromatography experiment on substance S is shown.

What is the R_f value of S?

• 0.39

• 0.46

• 0.56

• 0.62

The table lists some physical changes.

Complete the table using words from the box to show the change of state for each physical change.

• freezing

  boiling

  condensation

  sublimation

• freezing

  condensation

  melting

  deposition

• freezing

  boiling

  melting

  deposition

• freezing

  condensation

  melting

  sublimation

Identify a method to separate a single food dye from a mixture of food dyes.

Identify a method to separate gasoline from crude oil.

Identify a method to separate water from copper(II) sulfate solution.

State the number of different elements in C₃H₅N₃O₉

• 4

• 20

• 1

• 0

State the name given to the spreading out of gas particles.