Page 59 - ICSE Chemistry 6

Observa on 1: You will observe that when paper weight is suspended into the
glass bowl, some water fl ows out of it into the larger bowl.
Procedure 2

• Measure the volume of water collected in the larger bowl using a
measuring cylinder. Let it be a mL.
• Now remove the paper weight from the glass bowl and suspend it into the
glass tumbler.

Observa on 2: You will observe that when paper weight is suspended into the
glass tumbler, some water fl ows out of it into the larger bowl.

• Measure the volume of water collected in the bowl using a measuring
cylinder. Let it be b mL.
• Compare the two volumes.

Conclusion: You will observe that the volume of water collected in both the
cases is same.

This shows that solids have a defi nite volume.

Liquids

• Liquids have no fi xed shape but a defi nite volume. They take up the shape of the container they are
stored in.

• Liquids cannot be compressed. The volume of a liquid does not
change with the forces of compression.
• Liquids have a tendency to fl ow. Liquids are free fl owing
because the molecules are loosely packed. The increased
intermolecular space reduces the force between the molecules.
The intermolecular forces are not strong enough to hold the
molecules of a liquid at fi xed posi ons. Hence, the molecules
move freely within the liquid. Milk, fruit juice, petrol, etc. are
examples of liquids.
Fig. 3.3: Arrangement of
• Liquids have less density than solids. Since the par cles in liquids
molecules in liquids
have more intermolecular space between them, they have less
density as compared to solids.

• Liquids can diff use. The intermolecular force of a rac on is weaker in liquids as compared to solids.
Due to this reason, the par cles in liquids can diff use and mix with other liquids. For example, if a
drop of dye is added to a glass of water, it gets evenly distributed throughout the liquid.

Let’s perform Ac vity 3.9 to observe that liquids have a defi nite volume but no fi xed shape.

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