Page 68 - ICSE Chemistry 8

Review Your Learning

A. Fill in the blanks.
1. A substance that has a fi xed composi on and fi xed chemical proper es ___________________
2. A substance composed of two or more elements chemically combined
in a defi nite propor on by mass ___________________
3. A type of mixture consis ng of two or more immiscible liquids ___________________

4. A separa on technique used to separate components of a mixture when
the solubility of solid components varies in the same solvent ___________________

5. A process of separa ng fi nely suspended solid components in a liquid by
spinning the mixture in a closed container ___________________
6. The simplest type of chromatography ___________________

B. State whether the given statements are true (T) or false (F).
1. A compound can be broken down into its cons tuent elements by chemical reac ons.
2. A mixture has a defi nite composi on and the cons tuents of a mixture are present in a fi xed ra o.
3. It is essen al to separate the components of a mixture to remove harmful and undesirable impuri es.

4. We can separate a mixture of sand and water by frac onal dis lla on.
5. Sublima on is used to separate a mixture of iodine and sand.
6. A separa ng funnel can be used to separate a mixture of oil and water.

C. Explain the following terms.
1. Winnowing
2. Evapora on

3. Crystallisa on
4. Dis lla on
5. Centrifuga on

6. Separa ng funnel
D. Answer the following ques ons.
1. Write a note on the classifi ca on of mixtures.

2. Diff eren ate between handpicking and sieving.
3. Discuss the technique of solvent extrac on.
4. How is fi ltra on diff erent from froth fl oata on?

5. How is frac onal dis lla on carried out? Write the uses of frac onal dis lla on.
6. Write a note on chromatography. Discuss the advantages of chromatography.

PROJECT

Create a PowerPoint presenta on on the topic ‘Types of Mixtures’. Find the related informa on and images
using the Internet. Add audio and visual eff ects to your presenta on. Format it as per your choice.

54