Differentiate between an element and a compound (any two points). Give one example each.

What is distillation? List the two conditions essential for using this as a method of separation of components of a mixture.

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 substances that sublime easily are

Which of the following materials fall in the category of a "pure substance"?

How much water should be added to $15 \, g$ of salt to obtain a $15 \%$ salt solution (in $, g$)?