Soaps were originally made from___________ .

Natural adhesives are made from ________.

_______________ results in the change of the substance;

In _________________ only the shape, size or volume changes.

_____________ is a soft white or grey, naturally available mineral.

____________ is called as farmer’s best friend.

_________ is an example for natural adhesive.

In 1824, _____________ invented Portland cement by burning finely ground chalk and clay in a kiln.

_________________ are organic or inorganic materials that we add to the soil to provide one or more nutrients to the soil.

___________ are the three important nutrients among the various nutrients needed for the growth of plants.

Concentrated phenol is used as a disinfectant.

Plaster of Paris is obtained from heating gypsum.

NPK are the primary nutrients for plants.

Phenol irritates when exposed on human skin.

Cement becomes softer when it is mixed with water.

What are the three main constituents of soap?

Mention any three physical properties of phenol.

What are the ingredients of the cement?

What is meant by chemistry?

Why earthworm is called as farmer’s friend?

Explain the process of manufacturing cement.

What are uses of Gypsum?

Name some artificial adhesive.

How are detergents manufactured?

Differentiate organic and inorganic fertilizers.