DAV Class 6 Science Solution Chapter 3 Nature of Matter

DAV Class 6 Science Solution Chapter 3 Nature of Matter

DAV School Books Class 6 Science Solution Chapter 3 Nature of Matter all Question Answer. DAV Class 6 3rd Chapter Nature of Matter full Chapter explanation by expert teacher.

DAV School Books Class 6 Science Solution Chapter 3 Nature of Matter:

(A) Fill in the blanks.

Answer: (1) classification.

Answer: (2) space, mass.

Answer: (3) Gaseous.

Answer: (4) Opaque.

Answer: (5) diffusion.

(B) Write true or false for the following sentences:

Answer: (1) False.

Answer: (2) True.

Answer: (3) False.

Answer: (4) True.

Answer: (5) True.

(C) Tick (✓) the correct option.

(1) The state/states of matter, that have both a fixed shape and a definite volume, is/are ______.

Answer:- (c) solids only.

(2) Your book is made up of matter, because it ______.

Answer: (c) occupies space and has some mass.

(3) Which of the following is an opaque material?

Answer: (a) a piece of wood

(4) In which of the following cases would diffusion be the fastest?

Answer: (a) gas in another gas.

(5) Which of the following is insoluble in water?

Answer: (a) mustard oil.

(D) Answer the following questions in brief.

(1) Define the following:

(a) Natural materials

(b) Transparent materials

Answer:

• Natural materials – the materials which occur naturally are called natural materials.
• Transparent materials – the materials from which light can pass are called transparent materials.

(2) Name any three materials that are (i) transparent (ii) opaque in nature.

Answer:

(i) Transparent materials – glass, polythene.

(ii) Opaque materials – plastic, wood.

(3) Which state of matter (i) can (ii) cannot easily change its shape and volume Why?

Answer: Liquids can change its shape and volume because the particles of liquid are not closely packed examples – tap water, juice, Solid cannot change its shape and volume because the particles of solid are closely packed examples – wood, steel

(4) Why do materials diffuse into each other?

Answer:- Mixing two particles on their own is called diffusion. It can happen due to movement of free particles like gas.

(5) Define the term ‘solubility’. How does it change on increasing the temperature of water?

Answer: Solubility –

The maximum amount of substance that can be dissolved in the given volume of water is called solubility.

The particles separate while increasing in temperature which can affect solubility

(6) Name three materials that are (i) soluble (ii) insoluble in water.

Answer:-

(i) Materials that are soluble in water – sugar, salt, lemon juice and glucose powder.

(ii) Materials that are insoluble in water – rubber, wood, stone, beads.

A.) Answer the following questions.

1.) Why do solids have a fixed shape and a definite volume?

Answer: The solids have fixed shape and volume because the particles of solid are closely packed with each other and they cannot move.

2.) Briefly describe an activity to show that pure water is a transparent liquid.

Answer:- Take a glass of water and put a stick into it, the stick is clearly visible to us because the glass is transparent and light can pass through it. And pure water is also transparent material because light can pass through it and we can see the object.

3.) Describe an activity to show that a solid can diffuse slowly into a liquid.

Answer: The experiment to show the solids can slowly diffuse into the water –

Take some solid particles of potassium permanganate and pour it into the glass of water. After some time we can see the colour of water changes into pink. This is due to the diffusion of potassium permanganate.

4.) What is a ‘saturated solution’? How can one prepare a saturated solution of common salt in water?

Answer: A solution which cannot dissolve more amount of given substance at a given temperature is called a saturated solution. Take a glass of water at some common salt in the glass and stir it again and some common salt and again you can see the particles are dissolved in the water then add some sugar into water and stir and again add some salt into it after adding a particular amount of salt we can see sugar is not dissolved in water this is the saturated solution.

5.) Suggest one activity to show the effect of temperature on the solubility of a solid in water.

Answer:- Take 1 glass of normal water and 1 glass of hot water add sugar into water and stir it up to dissolve and continue adding sugar into both glasses till it stops dissolving.

We can observe the amount of sugar dissolve more in hot water as compared to normal water. This shows that the solubility increases with increase in temperature

Value based questions

Q.) Neha went to a village to attend the marriage of her cousin. She was very much upset when she observed that there was no cleanliness in, and around, many houses. She used a gentle, polite and slow approach to make the villagers realise the importance, and necessity, of keeping their surroundings neat and clean. She was happy to find the village very much cleaner by the time she left. While leaving, she told her cousin that her success was similar to that of blue ink drops which slowly make the water in a bowl uniformly light blue when they are dropped in it.

1.) State the values displayed by Neha.

Answer:- The value of cleanliness is told by her.

2.) Name the process through which blue ink drops make the water uniformly blue.

Answer:- diffusion is the process through which blue ink drops make the water uniformly blue.

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