Page 59 - Science class 4

Some matters like gold, platinum and carbon are
able to exist alone. This means that they do not

combine with any other atom. However, some
atoms are so active that they are usually found
combined with other atoms of the same kind to

form a molecule. Atoms of hydrogen, oxygen and
chlorine combine to form the molecules of

hydrogen, oxygen and chlorine respectively.
Some matters are formed of molecules containing

different atoms. For example water is made up of
two atoms of hydrogen and one atom of oxygen. Tiny Particles-Atoms

2 atoms of hydrogen + 1 atom of oxygen 1 molecule of water

STATES OF MATTER

All matter is made up of small particles. These particles are arranged in
different ways in solids, liquids and gases.

Solids

In a solid state, a matter has a define shape and
it takes up a definite amount of space. In this

state, matter has molecules that are very close
Solid to each other.

Keeping Update Liquids

In a liquid state, a matter does not
Our body contains around 70% water.
have a define shape but it takes up
a definite amount of space. In this state, there is a little

space between the molecules. These molecules are able
to slide past each other. This makes a liquid to flow.

Gases

In a gaseous state, a matter does not have a definite
Liquid
shape and it does not take up a definite amount of space.

On squeezing a balloon, you can

change the shape of air in it. Gas

takes the shape of its container.
In a gas, the molecules are much

Gas farther apart than in a solid or liquid.