Whenever matter undergoes a physical or’ a chemical change, it is always accompanied by an energy change in the form of heat. This change in energy is the quantitative measure of the difference in the strength of intermolecular forces. In case of physical change at constant pressure called enthalpy change. Enthalpy change is of three…
Liquids can be made to boil at low temperature where they can be distilled easily. This process is called vacuum distillation. Vacuum distillation has many advantages. It decreases time for the distillation process and is economical because less fuel is required. Many compounds can be avoided from decomposition e.g., glycerin boils at 290°C at 760…
Greater the pressure exerted on the liquid, greater would be the boiling point or vice versa. Boiling point of a liquid can be increased by increasing the external pressure on the liquid, whereas it can be decreased by decreasing the external pressure on the liquid. At 1 atmospheric pressure water boils at 100°C. At high…
In order to bring about phase change, latent heat is absorbed without any change in temperature. Because heat energy stored in steam is greater than that of boiling water at same temperature. Therefore steam produces more severe burns than does the boiling water.
When a liquid is heated, the kinetic energy of its molecules increases in other words the temperature increases as well as the rate of vaporization increases. When the kinetic energy of the molecules becomes maximum i.e., boiling point is reached any further heating at this stage will not increase the temperature rather heat will only…
The temperature at which vapour 34.6°C / 78.3°C/100’C/1 pressure of a liquid becomes equal to the atmospheric pressure or any other external pressure on the liquid is called boiling point of that liquid. Mechanism: When a liquid is heated, its vapour 200 pressure increases with the increase in temperature as shown in figure. A stage…