Separation of Substances Test - 1

Explanation:

Flour is cleaned by the process of sieving using the sieve to separate wheat or husk present in it.At our homes, flour is sieved to remove the bran.

Explanation:

On heating, gases expand maximum as the intermolecular force of attraction is very less. while solid, semisolid & liquid expand less as the intermolecular force of attraction is very large.

Explanation:

Butter is seperated from curd by churning in which curd is rotated at high speed using machine or hand.

Explanation:

The pure substance has fixed melting and boiling point due to identical particles but impurities present in pure substance changes it’s boiling and melting point.

Explanation:

Common salt is obtained from sea water by the process of evaporation in which sea water is allowed to collect in a shallow pond and evaporate in the sun, till it becomes dry. The water evaporates, leaving behind the solid particles of salts.

Explanation:

In the filtration process, the impurities are passed through a filter. The filter has pores in it that allow only liquids to pass through; it can separate the suspended particles or solid particles.

Explanation:

Because some alum gets dissolved in water. Its particles get attached to the dust particles and make them heavy in weight. Heavy particles settle down fast.

Explanation:

Solids, liquids and gases all dissolve in water. Water is a universal solvent.

Explanation:

In a mixture, the components do not react chemically with one another and so they retain their individual properties. Most of the substances that we see around us are the mixture of two or more substances.

Explanation:

Difference in weight is the property used to separate two solids from a mixture by winnowing. Winnowing is the process of separation of the heavier components from the lighter components of a mixture by wind or by blowing air. It is generally used by farmers to separate the lighter impurities such as husk particles from the heavier grains.