Methods of separation / Separation techniques

Assignment 1

Topic: Methods of separation / Separation techniques

 Q1 Define crystallisation.State the principle on which it works.

Q2 When is distillation used and where is fractional distillation used? Give one example of each.

Q3 Riya wants to separate a mixture of sand and salt.She directly filters the mixture without adding water. Will she succed? Justify.

Q4 A chemist has a mixture of ammonium chloride and sand .He heats the mixture and notices white fumes depositing on the upper part of apparatus.

(i) Name the process.

(ii) Which substance is separated?

 (iii) Why does this method work?

Q5 A student is given a mixture of oil, water and salt. She performs the following steps:

Uses a separating funnel.

Then, the remaining solution evaporates.

Answer the following:

(i) Why is a separating funnel used first?

(ii) What type of mixture is oil and water?

(iii) Which property is used in the funnel?

(iv) What is obtained after evaporation?

(v) Name the processes used overall.

Assignment 2

Topic: Methods of separation / Separation techniques

Q1 What type of mixtures can be separated by chromatography?

Q2 Can we separate two liquids A( boiling point 353K) and B(boiling point 365K) present in a mixture by simple distillation?

Q8 Why is fractionating column used in fractional distillation?

Q3 The fractional distillation method is suitable for separating which type of mixture? Explain with two examples.

Q4 Differentiate between simple distillation and fractional distillation.

Q6 Explain how petroleum is refined using fractional distillation?