Summary: In this chapter, we learn about methods of separating substances such as handpicking, sieving, filtration, evaporation, and sedimentation. These methods help us remove unwanted materials and obtain useful substances.
NCERT Exercise Questions & Answers
Q1. Why do we need to separate substances?
We need to separate substances to remove impurities and obtain useful components.
Q2. What is handpicking?
Handpicking is a method of separating unwanted substances by hand.
Q3. What is sieving?
Sieving is a method used to separate particles of different sizes using a sieve.
Q4. What is sedimentation?
Sedimentation is the process where heavier particles settle down at the bottom of a liquid.
Q5. What is filtration?
Filtration is a method used to separate insoluble solids from liquids using a filter.
Q6. What is evaporation?
Evaporation is the process of converting liquid into vapour to obtain dissolved substances.
Q7. What is decantation?
Decantation is the process of gently pouring a liquid to separate it from sediment.
Q8. What is a saturated solution?
A saturated solution is a solution in which no more solute can dissolve at a given temperature.