Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Answer the following questions:1. Why do we separate mixtures into their components?2. Describe the following methods of separation of Mixtures:(a) Winnowing (b) Sieving (c) Sedimentation (d) Evaporation
1. When two or more substances are mixed together they form a mixture. Components of a mixture should be separated because some components may not be useful or may spoil the useful component of the mixture.
2. Methods of separation of mixtures are explained below:-
(a) Winnowing is a farming method developed by ancient people for separating grain from the chaff.
It involves throwing the mixture into the air so that the wind blows away the lighter chaff. The heavier grains fall back down for recovery.
(b) Sieving is a method in which fine particles are sieved through holes of the sieve while the bigger impurities remain on the sieve.
Example- Sieving is used in a flour mill to separate impurities like husk and stones from wheat before grinding it.
(c) Sedimentation is the process in which heavier particles of an insoluble solid settle down in a liquid.
Decantation is the process of pouring out the liquid without disturbing the sediment.
Example- sand and water.
(d) Evaporation is the process by which water changes from a liquid to a gas or vapour. Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapour.
Evaporation is used to separate a soluble solid from a liquid.
Example- copper sulphate is soluble in water- its crystals dissolve in water to form a copper sulphate solution. So in order to get back copper sulphate crystals from its solution, we use evaporation.
49 Views
