“Heating” or “cooling” of a substance results in a change of its state—Explain giving reasons.
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Answer:
Heating a substance makes the molecules move faster. Cooling a substance makes the molecules move slower.
Explanation:
1)When heat is added to any substance, the particles gain energy and vibrates(with more speed) or vigorously about their fixed positions, forcing each other further apart.
Order of expansion Gas>Liquid>Solid
2) Increase in temperature:
When heated there is increase in kinetic energy and particles move at higher speed. Since temperature is a measure of average Kinetic Energy, the temperature increases.
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