This document discusses different methods for separating mixtures: evaporation/heating, filtration, sieving, sifting, straining, and winnowing. It provides examples of each method and a matching exercise to test understanding of the various separation techniques.
12. 1. Evaporation/heating - You can apply this to the mixture of salt
and water. We heat water and then it evaporates
leaving the salt substance.
2. Filtration – separating substances by filtering out undissolved
materials from the mixture
3. Sieving – a way which uses a sieve. A sieve is a wooden or metal
frame covered with wire screen through which loose material is
refined or a material containing liquid is strained.
Example: small rocks and sand
4. Sifting – separating and retaining coarse part like powdery substance
with a sieve.
Example: flour
5. Straining – to draw off or remove by filtration by filtering agent such
as a strainer.
6. Winnowing – separating the chaff from rice grains by wind.
13. What are the
different ways of
separating mixtures?
14.
15. Match Column A with Column B. Write the letter of the correct
answer.
A.
___1. Refining flour using a filter
___2. Separating materials by
heating
___3. Separating undissolved solid
materials in a mixture
___4. Separating coconut milk from
squeezed grated coconut using a
fine wire screen
___5. Separating pebbles from the
sand using a wire screen
B.
a. Filtration
b. Straining
c. Sieving
d. winnowing
e. Sifting
f. Evaporation