Question

Define:
(a) a pure substance
(b) sublimation
(c) loading
(d) separation of mixture

Answer 1

(a) A substance which if free form any impurity i.e., a substance which is made up of only one kind of substance, is called pure.
(b) Sublimation is the process of transition of solid directly into gas.
(c) Loading is the process of sticking light particles like mud onto heavy particles like alum, so that they become heavy and settle down at the bottom.
(d) The segregation of different components of mixtures depending upon their physical properties is called separation of mixtures.