Page 63 - ICSE Chemistry 8

EXERCISES

BE PROMPT

A. Fill in the blanks.

1. Pure substances can be classifi ed as _____________ and _____________.
2. _____________ possess proper es of both metals and non-metals.

3. An _____________ is a type of mixture consis ng of two or more immiscible liquids.

4. ___________________ is used to separate a mixture of iron fi lings and sulphur.
5. We can separate a mixture of sand and water by _____________________.

6. The technique of _________________ is used for the concentra on of sulphide ores.

B. Match the columns.
Column A Column B
1. Metals (a) Non-sonorous and bri le
2. Alcohol mixed with water (b) Emulsion
3. Non-metals (c) Conduct heat and electricity

4. Air (d) Separa on of a mixture of miscible liquids
5. Oil and water (e) Liquid-liquid mixture
6. Frac onal dis lla on (f) Mixture of gases

C. Write the techniques of separa on that can be used to separate the following mixtures.

Mixture Separa on technique

Small stones from sand at a construc on site ______________________________________

Small stones mixed with rice ______________________________________

Sand and water ______________________________________

Bits of paper and pulses ______________________________________

Sodium chloride and calcium carbonate ______________________________________

Iron fi lings and sulphur ______________________________________

Sawdust and water ______________________________________

D. Iden fy the error in the given statements. Circle the incorrect word and write the correct word in
the blank.
1. A compound can be broken down into its cons tuent elements by
physical methods. ____________________

2. A salt solu on is a heterogeneous solu on. ____________________

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