Chapter 3 | Nature of Matter | Class- 6 DAV Science Solutions

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DAV Class- 6 Science Nature of Matter Question and Answer

Something To Know

A. Fill in the blanks.

1. The process of grouping objects with similar properties is called classification.

2. Anything that occupies space and has mass is called matter.

3. In the gaseous state of matter, the constituent particles have very little hold on one another.

4. Light does not pass through a blackboard as it is an opaque object.

5. Smell of a perfume reaches us by the process of diffusion.

B. Write True or False for the following statements.

1. Air is a man-made material.

Answer 1: False

2. A thin polythene sheet is transparent.

Answer 2: True

3. Pebbles float on water.

Answer 3: False

4. Diffusion is the mixing of the particles of two materials, on their own.

Answer 4: True

5. Oxygen gas is slightly soluble in water.

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 1: solids only

2. Your book is made up of matter, because it—

Answer 2: occupies space and has some mass.

3. Which of the following is an opaque material?

Answer 3: a piece of wood

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

Answer 4: gas in another gas.

5. Which of the following is insoluble in water?

Answer 5: mustard oil

D. Answer the following questions in brief.

1. Define the following:

(a) Natural materials.

(b) Transparent materials

Answer 1: (a) Materials that occur naturally is known as natural materials.

(b) Materials that allow light to pass completely through it is called transparent materials.

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

Answer 2: (i) water, air, glass

(ii) wood, wall, milk

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

Answer 3:

(1) gaseous state of matter can easily change its shape and volume because its particles are not tightly packed with each other so, they can move.

(2) Solid-state of matter cannot change its shape and volume because its particles are very tightly packed with each other and cannot move. So, they cannot change their shape and volume easily.

4. Why do materials diffuse into each other?

Answer 4: The property of mixing of particles, of two materials, on their own, is called diffusion. This happens due to the free movement of the particles of such materials

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

Answer 5: Maximum amount of a substance that can be dissolved in a given volume, of a given liquid (usually water).

Solubility of a substance increases with increasing the temperature of the water.

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

Answer 6:

(1) sugar, salt, ink.

(2) sand, paper, oil

E. Answer the following questions.

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

Answer 1: Solids have a fixed shape and volume due to the fact that the particles in solids are very closely packed and cannot move. As a result, solids have a defined shape and volume.

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

Answer 2: Fill a half-filled beaker halfway with clean water. In a beaker of water, place a coin. Allow the beaker to sit undisturbed for a few minutes in a well-lit area. Observe the coin submerged in water from the beaker’s top. Is it possible for you to see the coin? The coin is readily visible when it is submerged in water. This demonstrates that water is a transparent liquid.

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

Answer 3: Fill a beaker halfway with clean water and set it on a table with enough lighting. Put a few potassium permanganate crystals in water. Keep a close eye on the water. The pink colour will gently spread through the water. This depicts the diffusion of a solid in a liquid.

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

Answer 4: The term “saturated solution” refers to a solution in which more of a given component cannot be dissolved at a given temperature.

To prepare a saturated solution of common salt in water follow these steps

Take a glass tumbler half-filled water. Add half a teaspoon of salt to it and stir well. The salt dissolves. Now, add another half teaspoon of salt and stir. This will also dissolve.

Keep on adding salt in half teaspoon amounts and stir well after every addition.

After adding a particular amount of salt, you will observe that salt is no more dissolving in the given volume of water.

The solution obtained in the above acts cannot dissolve more salt. Such a solution that cannot dissolve more amount of a given substance at a given temperature is called a saturated solution.

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

Answer 5: Fill two glass tumblers with the same amount of water. In one of the tumblers, heat the water. In two tumblers, put equal amounts of sugar and mix. The sugar disintegrates. In two tumblers, keep adding measured amounts of sugar until it stops dissolving.

Determine which tumbler has the most sugar dissolved in it. You’ll notice that there’s more sugar dissolved in hot water.

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