Separation Techniques (S3/S4)

The image shows a mixture of concrete nails and saw dust. Which of the following is the best technique to use to separate the nails from the saw dust?

• Sieving

• Chromatography

• Decantation

• Magnetic separation

Choose the pair that correctly identifies A and B.

• A: Residue,

  B: Filterate

• A: Solute,

  B: Filtrate

• A: Residue,

  B: Filtrate

• A: Solute,

  B: Filterate

How do you determine if a substance is pure?

• It is clear

• It boils only at 120°C

• It does not change colour

• It has a definite boiling point

Which of the following substances cannot be collected via crystallisation?

• NaCl

• CuSO₄

• KNO₃

• Sugar

During sublimation, component in mixture sublimes and crystals ____ the cooler surface of the inverted funnel upon heating.

• condense on

• are deposited on

• remain on

• are formed on

Which gases can be collected via displacement of water?

• H₂

• O₂

• Cl₂

• SO₂

To obtain pure and dry crystals after separating solution via crystallisation, we need to _____.

• wash them with cold distilled water quickly and dry between pieces of toilet paper

• wash them with cold distilled water quickly and dry between pieces of filter paper

• wash them with warm distilled water quickly and dry between pieces of filter paper

• wash them with ice water quickly and dry between pieces of filter paper

Upward delivery is used to collect gas ____ dense than air

• more

• less

• equally as

Which separation technique is used to obtain pure water from seawater?

• Simple distillation

• Filtration

• Fractional distillation

• Evaporation

What is the name of this separation technique?

• Simple distillation

• Fractional distillation

• Boiling

• Evaporation