Answer the following questions:
1 Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change Why?
2) Explain with examples the periodic and non-periodic changes?
3) Solidis cannot be compressed, but gases are highly compressible. Give reasons.
4) Give reasons why particles of matter move more rapidly on application of heat.
Answers
Answer:
Explanation:
1) When Platinum gets heated, it changes color. When cooled it retains its earlier color and it does not react easily with oxygen in the air. Magnesium reacts with Oxygen in the air and forms magnesium oxide which cannot be undone
2) Day and night, changing phases of the moon, beating of heart, clock striking an hour are all examples of periodic motion whereas water becoming ice, burning of matchstick etc are non periodic changes. Definition. Changes which are repeated after regular intervals are called periodic changes.
3)Answer. There are large inter molecular space between gas thus making it highly compressible while in solid inter molecular space is very less thus making the solid molecules lose their comprehensibility. This is the reason why gases are highly compressible and solids are not
4) When heat is applied to particles of matter, the kinetic energy possessed by the particles increases and so does the space, therefore they move more rapidly and freely. The inter-particle attraction also decreases hence, they move distantly from each other