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Answers
Answers:-
1. (a) Growth of a tree:
• Irreversible Change
• Slow Change
• Non-Periodic Change
• Chemical Change
(b) Burning of paper:
• Irreversible Change
• Fast Change
• Non-Periodic Change
• Physical Change
(c) Weathering of a rock:
• Irreversible Change
• Slow Change
• Non-Periodic Change
• Physical and Chemical Change
(d) Making ice cream from milk
• Irreversible Change
• Slow Change
• Non-Periodic Change
• Physical Change
• Man-Made Change
2. Change of ice to water, and Change of water to steam
3. This expansion and contraction phenomenon is used in thermometers. When the temperature of the person is high, the mercury in the thermometer rises. Similarly, when the temperature is normal, nothing happens to the mercury since it doesn't expand in absence of heat.
4. (a) Physical Change
(b) Chemical Change
(c) Physical Change
(d) Chemical Change
5. Physical Change:
• Mostly reversible. Exceptions: burning of paper, etc.
• There is no change in the internal arrangement of the molecules, only the shape or size changes.
Chemical Change:
• Mostly irreversible.
• There is a change in the internal arrangement of the molecules.
Answer:
the collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets. The planets of the solar system are (in order of distance from the sun) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.