effects of impurities on boiling point and freezing point

When common salt is added to crushed ice to make a freezing mixture the temperature is lowered below 0 o C. This is because ice absorbs heat from salt which is at a higher temperature and some ice melts dissolving some salt in it. This process continues till all the salt is dissolved or ..

The boiling point of liquid is raised by increasing the pressure and reduced by lowering the pressure. It can be demonstrated by the apparatus shown in figure...

A liquid may be made to boil at any desired temperature by changing the external pressure. For example, a liquid may be made to boil at higher temperature by increasing the pressure on its surface, as is done in a pressure cooker. It may be made to boil at a lower tem..

Carboxylic acids have higher boiling point than aldehydes and ketones and even alcohols of comparable masses. This is due to more extensive association of carboxylic acid molecules through intermolecular hydrogen bonding...

Effect of Temperature and Pressure on States of Matter - When we heat a solid, we add energy to the system increasing the vibration of the particles. Eventually these particles break free from their binding forces and melt. The normal melting point of a crystal is the temperatur..

This method is used for volatile metals having boiling points lower than their impurities. e.g., zinc, mercur..

Colloidal particles have high average molecular masses. Therefore the mole fraction of the dispersed phase is very low. Hence, in colloidal solutions the relative lowering of vapor pressure, elevation in boiling point, depression in freezing point and osmoti..

Certain properties of solutions depend only on the number of particles of the solute (molecule or ions) present in definite volume of the solution and do not depend on the nature of solute. Such properties are called colligative properties. A few colligative properties are: (i) Relative lowering of..

Question: The temperature at which vapour changes into liquid is called ________. 1. freezing point 2. melting point 3. boiling point 4. liquefaction point Answer: ..

>o C. Two examples illustrate this. Firstly, when water is heated in a pressure cooker, more and more steam is formed and it is not able to escape out. The pressure gradually increases and as a result, the boiling point starts rising much above 100 o C (Fig.6.3..