Grade 7 Science: Separation Techniques

Separation Techniques Worksheet

Read each question carefully and answer to the best of your ability. This worksheet covers various separation techniques used in chemistry.

1. Which separation technique is best for separating insoluble solids from liquids?

2. Which of the following is used to separate liquids with different boiling points?

1. In chromatography, substances are separated based on their different affinities for the stationary and   phases.

2. Filtration uses a   to separate solid particles from a liquid.

3. Evaporation is a method used to separate a   solid from a liquid solvent.

1. Sieving can be used to separate a mixture of sugar and salt.

2. Distillation involves heating a liquid to form a vapor and then cooling the vapor to condense it back into a liquid.

1. Explain how filtration is used to purify water.

2. Describe a real-world application where distillation is used.

Observe the diagram of the distillation apparatus below and answer the questions.

a. What is happening in the flask on the left?

b. What is the purpose of the condenser?

Use the words below to complete the sentences.

1. Separating iron filings from sand can be done using  .

2.   is a technique that separates components of a mixture by spinning them at high speeds.

3. When a mixture of immiscible liquids is allowed to stand, the denser liquid settles at the bottom, and the top layer can be poured off using  .