Question

D. Answer in brief. 1. Give two important effects of heat.​

Answer 1

Answer:

Following are the effects of heating

1) 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>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.

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.

Answer 2

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There are various effects of heat. It can be chemical as well as physical.

The important effects of heat on an object are :

1. Raises the temperature.

2. Increases volume.

3. Changes state.

4. Brings about chemical action.

5. Changes physical properties.

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Some other effects of heat on a substance are :

1. When heat is given to a substance the particles of the substance will move with greater speed as k=1/2mV^2.

So, with an increase in speed and mass, kinetic energy will also increase. Due to this the temperature of the substance increases and if heat is taken out from the substance then its temperature decreases.

2. When a substance gushes heat, it's particles separation increase because of the vibration of the particles about their heat, temperature increases to a constant value and then the heat is used in increasing the gap between the particles and due to increasing M gap, The change in the state of the substance also occurs.

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Note: When a certain amount of heat energy is given to a substance, it will undergo one or more of the following changes: Temperature of the substance rises. The substance may change its state from solid to liquid or from liquid to gas. The substance will expand when heated. When a substance is cooled, that is, when the heat is removed, the molecules lose heat and its temperature falls. Change in the state also occurs.

$\huge\fbox{Hope it helps :-)}$