Things Dissolved in water Did not dissolve in water Colour of water changes Colour of water does not change Salt ü ü Turmeric Powder ü ü Mustard oil ü ü Sand ü ü Do all the things dissolve in water?

Solubility is the maximum amount of a solute that will dissolve in a given amount of solvent at a particular temperature. Things such as salt dissolve completely in water. Mustard oil does not dissolve in water. Mustard oil and water are two are immiscible liquids. They form two separate layers. Sand and turmeric also do not dissolve in water. They will settle at the bottom of the water. So, all the substances do not dissolve in water.

Things Dissolved in water Did not dissolve in water Colour of water changes Colour of water does not change Salt ü ü Turmeric powder ü ü Mustard oil ü ü Sand ü ü Does the colour of the water always change?

Water is a universal solvent as it is capable of dissolving a variety of different substances. Sometimes the colour of the water changes if something is dissolved in it. But, the colour of the water does not change always. Many things dissolve in water without changing the colour also. For example: The colour of the solution will change when turmeric powder is added to it. If the salt is pure, the salt dissolves completely in water without changing the colour of water Therefore, the colour of the water do not change always.

Things Dissolved in water Did not dissolve in water Colour of water changes Colour of water does not change Salt ü ü Turmeric powder ü ü Mustard oil ü ü Sand ü ü Do oil and sand dissolve in water?

Water is a universal solvent as it is capable of dissolving a variety of different substances. Oil and sand does not dissolve in water. Oil and water form two separate layers. The sand will settle at the bottom of the water.

How could you know the water is dirty If the water looks clean can you be sure that it is alright to drink that water

EASY

4th Manipur Board

IMPORTANT

Environmental Studies Class 4>Chapter 14 - Water Fit for Drinking>Exercise 2

From where do you get your drinking water? A river, or a pond or a lake?

EASY

4th Manipur Board

IMPORTANT

Environmental Studies Class 4>Chapter 14 - Water Fit for Drinking>Do it Yourself>Q (i)

Things	Dissolved in water	Did not dissolve in water	Colour of water changes	Colour of water does not change
Salt	ü			ü
Turmeric Powder		ü	ü
Mustard oil		ü		ü
Sand		ü	ü

Do all the things dissolve in water?

EASY

4th Manipur Board

IMPORTANT

Environmental Studies Class 4>Chapter 14 - Water Fit for Drinking>Do it Yourself>Q (ii)

Things	Dissolved in water	Did not dissolve in water	Colour of water changes	Colour of water does not change
Salt	ü			ü
Turmeric powder		ü	ü
Mustard oil		ü		ü
Sand		ü	ü

Does the colour of the water always change?

EASY

4th Manipur Board

IMPORTANT

Environmental Studies Class 4>Chapter 14 - Water Fit for Drinking>Do it Yourself>Q (iii)

Things	Dissolved in water	Did not dissolve in water	Colour of water changes	Colour of water does not change
Salt	ü			ü
Turmeric powder		ü	ü
Mustard oil		ü		ü
Sand		ü	ü

Do oil and sand dissolve in water?

EASY

4th Manipur Board

IMPORTANT

Environmental Studies Class 4>Chapter 14 - Water Fit for Drinking>Do it Yourself>Q (i)

How do you clean drinking water at home?

EASY

4th Manipur Board

IMPORTANT

Environmental Studies Class 4>Chapter 14 - Water Fit for Drinking>Do it Yourself>Q (ii)

What are the different ways of cleaning water at home?

MEDIUM

4th Manipur Board

IMPORTANT

Environmental Studies Class 4>Chapter 14 - Water Fit for Drinking>Do it Yourself>Q (iii)

Draw pictures showing any two ways of cleaning the water.

EASY

4th Manipur Board

IMPORTANT

Environmental Studies Class 4>Chapter 14 - Water Fit for Drinking>Exercise 5>Q (i)

It was a Sunday morning in May at Uripok, Imphal. Tomba was watching cartoon films in television. His mother Sanahanbi was in the kitchen. His father Ibohal was reading a newspaper. Suddenly Ibohal called out, 'Sanahanbi, it says in the newspaper that the main pipe carrying tap water in this area is broken at Iroisemba. The water in the pipe has got mixed with the water in the ditches. It also says that many people of Naoremthong are suffering from diarrhoea and vomiting because of this water. Why don't you throw away the water that was filled yesterday? Boil some clean water for drinking otherwise we may fall sick'.

Read the above article and answer the following question.

Why was Ibohal worried when he read the newspaper?

How could you know the water is dirty? If the water looks clean, can you be sure that it is alright to drink that water?

Important Questions on Water Fit for Drinking

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