CHEMISTRY [5 Mark Question Answer]

When metal ball is heated, it expands. This can be proved by following experiment:
ake a metallic ring and ball. Try to pass the metal ball through the ring. The ball is able to pass through the ring. Now heat the metal ball for 5-6 minutes. The hot ball is not be able to pass through the ring. This shows that a solid expands on heating. Now cool the ball, it again passes through the ring. This shows that a solid contacts on
cooling.

Experiment: Add sugar to pebbles taken in a plastic beaker or sand to glass balls in a beaker.
Observation: The sugar or the sand goes into the space between the pebbles & the glass balls respectively.
Conclusion: An imaginative demonstration to show that intermolecular spaces between particles are occupied easily.

INTERCONVERSION OF MATTER:
“Change of state of matter from one state to another state and back to its original state is called inter-conversion of matter.”
The diagram showing the Change of State of Matter:

(a) ICE TO WATER (MELTING): Conversion of a solid into a liquid on heating
e.g. ice to water.
(b) WATER TO WATER VAPOUR (VAPORISATION):Conversion of a – liquid into vapours (or gas) on heating
e.g. water to water vapour.
(c) WATER VAPOUR TO WATER (LIQUEFACTION or CONDENSATION):Conversion of VAPOUR (or gas) into a LIQUID on cooling
e.g. water vapour to water.
(d) WATER TO ICE (SOLIDIFICATION OR FREEZING):Conversion of a LIQUID into a SOLID
e.g. water to ice.

Have mass – A solid has mass
A: A simple scale– is taken, as shown below
B: A solid is placed– on one side of the scale, causes the scale tilts towards one side.
Conclusion– The scale tilts due to the mass of the solid hence all solids have mass.

occupy space: solid-occupies space
‘A’-A measuring cylinderis filled with water to a particular mark-‘A’.
‘B’-A piece of a wooden block- is immersed inside the measuring cylinder. The water level rises up.
‘C’-On removal of the block- the water level in the measuring cylinder falls down back to the mark- ‘A’
Conclusion: The block pushes the water out and occupies its space, hence all solids occupy space.

Solids expand on heating can be shown by two different experiments. The experiments are:
Experiment A: An iron bar is taken and its length measured accurately. The iron bar is then slowly heated for a certain period of time & measured accurately [with a vernier caliper or otherwise]
Observation: It is observed that the iron bar has increased in length on heating.
Experiment B: A simple ball & ring apparatus is taken, which consists of a metal ball which can just pass through the circular metal ring. The metal ball is then heated for a certain period of time.
Observation: After heating, the metal ball does not pass through the ring, since on heating it has expanded in size and hence cannot pass through the ring.
Conclusion: All solids expand on heating.