Question

Mention the effects of heat on a substance.

Answer 1

Hint:When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determine the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.

Complete step by step solution:
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.

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 $k = \dfrac{1}{2}m{V^2}$
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.

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.