Question

Fill in the blanks.

1. A pure substance has definite..............and constant................

2. Mixtures can be................... or................ 

3. Use of a............... to separate the components of a mixture of solids is based on the difference in the size of the components.

4................. is used when the constituents of a mixture of solids have difference in their weights.

5. Iodine, camphor, naphthalene, ammonium chloride and dry ice are some substances that................. 

Answer 1

1. A pure substance has definite composition and constant properties.

2. Mixtures can be heterogeneous or homogenous.

3. Use of a sieve to separate the components of a mixture of solids is based on the difference in the size of the components.

4. Winnowing is used when the constituents of a mixture of solids have a difference in their weights.

5. Iodine, camphor, naphthalene, ammonium chloride, and dry ice are some substances that sublimate.