25 mL each of water and alcohol are taken in two separate dishes and left exposed to air. What do you expect to observe ?

Water is cooled to 0^(@)C . What do you expect to happen ?

A mixture of chloroform and water taken in a separating funnel gest separated into two layers. Which one of the these two substance is expected to occupy the upper layer and why ?

A students took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour . What changes do you expect ?

Fill in the blanks. (a) A colloid is a ……… mixture and its components can be separated by the technique known as ……… . (b) Ice, water and water vapour look different and display different ………. Properties but they are ……. the same. (c) A mixture of chloroform and water taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be of ........ and the lower layer will be that of ....... . (d) A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called .......... . (e) When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the ...... of light by milk and the phenomenon is called .......... . This indicates that milk is a ........... solution.

The central angles of two sectors of circles of radii 7 cm and 21 cm are respectively 120^(@) and 40^(@) . Find the areas of the two sectors as well as the lengths of the corresponding arcs. What do you observe ?

Take two similar pages from your notebook. Crumple one paper and allow this and the other paper to fall on the ground simultaneously. What do you observe?