™™™™Q8. Explain how liquids expand more than solids.
Q9. Give all possible effects of heat.
Q10. Can a clinical thermometer be used to measure the temperature of
boiling water? Why?
Answers
Answer:1..When a solid is heated, its atoms vibrate faster about their fixed points. ... Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids
2..Following are the effects of heating1) Expansion: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>Solid2) 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.3) Change in state:When there is phase change of solid to liquid and liquid to gas, temperature remains constant but there is absorbing of heat, heat absorbed is used to separate particles and there is no rise in temperature.
3..No, a clinical thermometer cannot be used to measure the temperature of boiling water because it has a small range and might break due to extreme heat.
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Answer:
Q8. When a solid is heated, its atoms vibrate faster about their fixed points. The relative increase in the size of solids when heated is therefore small. Metal railway tracks have small gaps so that when the sun heats them, the tracks expand into these gaps and don’t buckle.
Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids.
Q9 Prolonged exposure to extreme heat can cause heat exhaustion, heat cramps, heat stroke, and death as well as some chronic dieseas.
Q10 No, a clinical thermometer cannot be used to measure the temperature of boiling water because it has a small range and might break due to extreme heat.