09. How will you separate the following mixtures?
1. wheat grains from husk
2. small stones from pulses
3. iron dust from sulphur
4. saw dust and water
5. charcoal powder and water
Answers
Answer:
1)Wheat grains from husk: Wheat grains from husk can be done through the Winnowing technique or sedimentation process.
This process takes some amount of time.
2)Small stones from pulses: Winnowing is the method of separating components of a mixture containing heavier and lighter components by wind or by blowing air.
This method is commonly used by farmers to separate lighter husk particles from heavier seeds grain.
3)Iron dust from sulphur:To seperate Iron and Sulphur from the mixture by physical means.
Do this by wrapping the end of a small bar magnet in a paper tissue or cling film, and dipping it into a teaspoon-sized heap of the mixture on a watch glass.
The iron will be attracted, but the sulfur remains on the watch glass.
4)Saw dust and water:A mixture of 'sawdust and water' cannot be separated by 'sedimentation and decantation'. Sedimentation and decantation is the process of separation of solid that is heavier than liquid by pouring out the liquid after the solid is 'settled at the bottom' of the vessel.
5)Charcoal powder and water:The method for separation of charcoal from water is Sedimentation.
Leave the mixture of charcoal and water for 10 to 15 minutes, then the more dense substance will settle down , this process is know as sedimentation where the charcoal particles are sediments.
Now you can filter the water using filter paper.