Page 56 - Science Class 06

chalk-powder. Put them in five tumblers one-by-one. As for the sixth and seventh
tumbler, put a few drops of kerosene and glycerine in them, respec vely.
Observa on:

Put a ck in the correct column:
Material Soluble Insoluble

Water
Sugar

Salt

Sand

Chalk
Potassium Permanganate

Kerosene

Glycerine
Shake the contents of each tumbler well and leave all of them at peace for a few minutes.
Now, observe each tumbler carefully. In some of the tumblers, the material added must

have disappeared (dissolved). But in others, the material will be lying at the bo om or
floa ng on the surface of the water. Clearly, these materials have not dissolved in water.

So, ma er can be either soluble or insoluble the water animals and water plants to
in water. The liquid soluble in water are remain alive under water. But nitrogen and

called miscible, e.g., glycerine and the methane are not soluble in water.
liquid not soluble in water are called
Heaviness
immiscible, e.g., edible oil. As for gases, we
already know that oxygen and carbon Different forms of ma er can be either
dioxide are soluble in water and they help heavier than water or lighter than it. Let us
see how to determine it.

Aim : Test for heaviness.
Procedure : Take six bowls and fill half of each with water. Now, take two iron nails, a

piece of ice, a piece of wood, a piece of plas c, a small stone and some kerosene. Put
each of the above objects one-by-one in a bowl. Some of the objects will sink down in
the water while others will float on its surface. The materials that float on the surface are
lighter while those sinking down are heavier than water.
Observa on:

Put a ck in the correct column:

56 Science-6