Question

Take about 150 g of ice in a beaker and suspend a laboratory thermometer so that its bulb is in contact with the ice, as in Fig. 1.6. Start heating the beaker
a low flame. Note the temperature when the ice starts melting. Note the temperature when all the ice has converted into water. Record your observations for this conversion of solid to liquid state. Now, put a glass rod in the beaker and heat while stirring till the water starts boiling. Keep a careful eye on the thermometer reading till most of the water has vaporised. Record your observations for the conversion of water in the liquid state to the gaseous state.give me the aim conclusion and observation of this activity

Answer 1

Aim:

To understand latend heat of melting/fusion and latend heat of vaporization

Observation:

We will realise that even all the ice has converted to water the temperature still shows 0 degree C. When the water starts boiling, the temperature never rises above 100 degree C

Conclusion:

Even though all the ice has melted the temperature still shows 0 degree C. It is because the energy provided is used to break the force of attraction between the particles and thus convert from solid to liquid. On heating, particles gain more kinetic energic,they vibrates from its position and starts moving freely. This heat is hidden in the content of the breaker and is never shown in the thermometer. Latend means hidden. The energy required to convert 1 kg of solid to liquid at atmospheric measure at its melting point is called Latend heat of melting. In the same way ,the heat supplied increases the kinetic energy of particles, starts moving freely and break the force of attraction between particles, so the temperature never rises above 100 degree Celsius. The steam may have more temperature than water. The energy required to convert 1 kg of liquid to gas at atmospheric pressure at its boiling point is called Latend heat of vaporization.

Thus we can conclude that Latend heat of melting and vaporization is used to convert solid to liquid and liquid to gas respectively.