Long Answer Type Questions
37. What is a mixture? Give five examples of mixtures. Why do we call sea-water a mixture ?
38. Describe how common salt is obtained from sea-water
Answers
What is a mixture?
A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs.
Five examples of mixtures.
examples:Dirt and water
Ink: A mixture of coloured dyes.
Air: a mixture of various gases
Alloys are usually homogeneous mixtures of metals
Water and salt (Sea water)
Why do we call sea water a mixture?
The sea-water contains a mixture of salt and some other bigger size of impurities and a mixture of several gases in seawater. Due to other bigger size of impurities, seawater is classified as a heterogeneous mixture while due to a mixture of several gases and salt in seawater it is classified as homogeneous mixture.
Describe how common salt is obtained from sea-water.
One of them is common salt, when sea water is allowed to stand in shallow pits, water gets evaporated by sunlight and slowly turns into water vapor. In a few days, the water evaporates completely leaving behind the solid salts. Common salt is then obtained from this mixture of salts by further purification.
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Explanation:
A common salt is obtained from sea water by the proces of evapor cuaportion