Question

Describe how mixtures mentioned below are seperated.​

Answer 1

The different methods for separating the mixtures given in the list are:

1. sugar and salt:

• The mixture of salt and sugar can be simply separated by evaporation.
• Unlike salt, sugar is soluble in alcohol group compounds.
• so, the mixture is dissolved in ethanol, after which sugar is dissolved in ethanol and salt can be separated.
• Then the mixture of sugar and ethanol is evaporated. Sugar is separated by itself.

2. flour and rice

• Flour and rice is a mixture where one is finely powdered whereas the other has bigger particles. Therefore it can be separated by the method of sieving.
• Take a sieve and place a container big enough for the mixture.
• Slowly put parts of the mixture and sieve it properly.
• The flour is separated and collected in the container being finely powdered while rice remains in the sieve as rice has a size big enough to go through the sieve.
• This is how the mixture is separated.

3. Sand and gravel

• Sand is slightly finer than gravels as gravels are bigger particles.
• This mixture can also be separated by sieving.
• For separating the sand and gravel mixture the mesh of the sieve is big enough for the sand to be sieved through whereas it is smaller for the travels to be sieved.
• By sieving sand is separated or collected separately and the gravel remains in the sieve.

4. Marbles and stones

• Marbles and stones both are bigger enough to be separated physically.
• Marbles are big enough to be handpicked and can be easily removed from stones.

5. powdered milk and sugar

• The mixture of powdered milk and sugar is separated winnowing.
• Winnowing is a method of separating larger particles from smaller ones by blowing air or wind.
• When air is blown the powdered milk is separated from the sugar particles.
• This is how the mixture is separated.