The DAV Class 6 Science Solutions and DAV Class 6 Science Chapter 3 Question Answer – Nature of Matter are essential study tools for DAV public school students in Class 6.
DAV Class 6 Science Ch 3 Question Answer – Nature of Matter
DAV Class 6 Science Ch 3 Solutions – Nature of Matter
Something To Know
A. Fill in the blanks.
Question 1.
The process of grouping objects with similar properties is called ______
Answer:
Classification
Question 2.
Anything that occupies ______ and has ______ is called matter.
Answer:
Space, mass
Question 3.
In the ______ state of matter, the constituent particles have very little hold on one another.
Answer:
Gaseous
Question 4.
Light does not pass through a blackboard as it is an ______ object.
Answer:
Opaque
Question 5.
Smell of a perfume reaches us by the process of ______
Answer:
Diffusion
B. Write True or False for the following statements.
1. Air is a man-made material.
2. A thin polythene sheet is transparent.
3. Pebbles float on water.
4. Diffusion is mixing of particles of two materials on their own.
5. Oxygen gas is slightly soluble in water.
Ans.
1. Air is a man-made material. (False)
2. A thin polythene sheet is transparent. (True)
3. Pebbles float on water. (False)
4. Diffusion is mixing of particles of two materials on their own. (True)
5. Oxygen gas is slightly soluble in water. (True)
C. Tick (✓) the correct option.
1. The state/states of matter, that have both a fixed shape and a definite volume, is/are
(a) Liquids and solids
(b) Gas and liquids
(c) Solids only
(d) Liquids only
Answer:
(c) Solids only
2. Your book is made up of matter, because it
(a) Has mass
(b) Occupies space
(c) Occupies space and has some mass
(d) Does not float on water
Answer:
(c) Occupies space and has some mass
3. Which of the following is an opaque material?
(a) A piece of wood
(b) A plane, thin sheet of glass
(c) Pure air
(d) Water in a clear glass container
Answer:
(a) A piece of wood
4. In which of the following cases would diffusion be the fastest?
(a) Gas in another gas
(b) Liquid in another liquid
(c) A solid in a liquid
(d) A gas in a liquid
Answer:
(a) gas in another gas
5. Which of the following is insoluble in water?
(a) Mustard oil
(b) Sugar
(c) Carbon dioxide
(d) Common salt
Answer:
(a) Mustard oil
D. Answer the following questions in brief.
Question 1.
Define the following:
(a) Natural materials
Answer:
Materials which are obtained from nature are called natural materials.
(b) Transparent materials
Answer:
Materials which allow light to pass through them are called transparent materials.
Question 2.
Name any three materials that are (i) transparent (ii) opaque in nature.
Answer:
(i) Glass, thin plastic sheet, water
(ii) Sugar, salt, lemon juice, Brick, wood, steel
Question 3.
Which state of matter (i) can (ii) cannot easily change its shape and volume? Why?
Answer:
- Gases can easily change shape and volume because particles in a gas are far away from each other. Liquid can change its shape but cannot change its volume because particles in a liquid are loosely packed,
- Solid cannot change its shape and volume easily, because particles are tightly packed in solid.
Question 4.
Why do materials diffuse into each other?
Answer:
There are empty spaces between particles of matter. Another material can occupy this space. Due to this, materials diffuse into each other.
Question 5.
Define the term solubility. How does it change on increasing the temperature of water?
Answer:
The ability of a substance to dissolve in another substance is called solubility. Solubility of a substance increases with increase in temperature of water.
Question 6.
Name three materials that are (i) soluble (ii) insoluble in water.
Answer:
- Soluble substances: sugar, salt, oxygen
- Insoluble substances: sand, clay, stone
E. Answer the following questions.
Question 1.
Why do solids have a fixed shape and a definite volume?
Answer:
The particles of solid are tightly packed together and they don’t move. Due to this, solids have a fixed shape and volume.
Question 2.
Briefly describe an activity to show that pure water is a transparent liquid.
Answer:
Take pure water in a beaker. Put a picture on another side of beaker. You can easily see the picture from the other side. This shows that water is a transparent liquid.
Question 3.
Describe an activity to show that a solid can diffuse slowly into a liquid.
Answer:
Take water in a beaker. Put a pinch of potassium permanganate crystals in water. After some time, the water becomes magenta in colour. This happens because of diffusion of potassium permanganate crystals. This activity shows that a solid can diffuse slowly into a liquid.
Question 4.
What is a ‘saturated solution’? How can one prepare a saturated solution of common salt in water?
Answer:
When a solution cannot take up any more quantity of solvent, it is called a saturated solution. For making a saturated solution of common salt in water, dissolve common salt in water by adding a spoonful of salt. Repeat this step until no more salt can be dissolved in water. This will give a saturated solution of common salt in water.
Question 5.
Suggest one activity to show the effect of temperature on the solubility of a solid in water.
Answer:
Take a concentrated solution of common salt in water. Heat this solution for some time. After that, you can easily dissolve another spoonful of salt in this solution. This shows that increase in temperature increases the solubility of a solid in water.
Value Based Questions
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.
Question 1.
State the values displayed by Neha.
Answer:
Care for environment, patience, positive thinking
Question 2.
Name the process through which blue ink drops make the water uniformly blue.
Answer:
Diffusion
Question 3.
Let each student think of an incident, or a situation, in which the efforts of one person brought a useful, or desirable, change in that situation.
Answer:
Do it yourself.
Something To Do
Question 1.
Visit a nearby departmental store and observe how classification of objects is useful. Try to find out the basis of the classification of different objects. Write your observation in a tabular form.
Answer:
Do it yourself.
Question 2.
Make a model to show the arrangement of particles in three states of matter.
Answer:
For this, small beads can be used; where each bead represents a particle.
Question 3.
Fill the boxes with suitable words on the basis of the clues given below.
Across:
(b) It has mass and occupies space.
(d) It has a definite volume but no fixed shape.
(e) Particles of two materials mixing on their own.
Down:
(a) It has a definite volume and a fixed shape.
(c) The solution that has the maximum amount of a substance, dissolved, in a given volume of it.
Answer:
DAV Class 6 Science Chapter 3 Solutions – Nature of Matter
I. Fill in the blanks.
Question 1.
Man-made materials are also known as ______ materials.
Answer:
Synthetic
Question 2.
Materials which are obtained from ______ are called natural materials.
Answer:
Nature
Question 3.
In ______ state, the particles cannot move.
Answer:
Solid
Question 4.
In ______ state, the particles can move a little.
Answer:
Liquid
Question 5.
In ______ state, the particles can freely move.
Answer:
Gaseous
Question 6.
A ______ material allows light to pass through it.
Answer:
Transparent
Question 7.
An ______ material does not allow light to pass through it.
Answer:
Opaque
Question 8.
An eraser can ______ on water.
Answer:
Float
Question 9.
An iron nail will ______ in water.
Answer:
Sink
Question 10.
Salt is ______ in water.
Answer:
Soluble
II. Tick (✓) the correct option.
1. Which of these is a natural material?
(a) Brick
(b) Styrofoam
(c) Cotton
(d) Plastic
Answer:
(c) Cotton
2. Which of these is made from synthetic material?
(a) Paper
(b) Rubber
(c) Brick
(d) Styrofoam
Answer:
(d) Styrofoam
3. Which of these would not show diffusion?
(a) Perfume
(b) Salt
(c) Potassium permanganate
(d) Ink
Answer:
(b) Salt
4. Which of these is soluble in water?
(a) Salt
(b) Sugar
(c) Lemon juice
(d) All of these
Answer:
(d) All of these
5. Which of these is insoluble in water?
(a) Sand
(b) Chalk powder
(c) Iron fillings
(d) All of these
Answer:
(d) All of these
6. Which of these is immiscible with water?
(a) Lemon juice
(b) Vinegar
(c) Mustard oil
(d) Soya sauce
Answer:
(c) Mustard oil
7. Which of these has definite volume and shape?
(a) Sugar
(b) Oil
(c) Brick
(d) Soil
Answer:
(b) Oil
8. What is the effect of temperature on saturation?
(a) Saturation increases with temperature
(b) Saturation decreases with temperature
(c) Temperature has no effect on saturation
(d) It depends on nature of solvent.
Answer:
(b) saturation decreases with temperature
III. Answer these questions.
Question 1.
What is the difference between natural and synthetic materials?
Answer:
Natural materials are obtained from nature, while synthetic materials are made by humAns.
Question 2.
What do you understand by classification of materials? What is the benefit of classification?
Answer:
Grouping materials on the basis of similarities is called classification. Classification makes study of materials much easier. It also helps in easier management of materials.
Question 3.
How will you define matter? How can you say that a brick is matter?
Answer:
Anything which has a mass and which occupies space is called matter. A brick has a mass and it occupies space. Hence, a brick is a matter.
Question 4.
Glass is an ideal material for making spectacles. Why?
Answer:
Glass is a transparent material because it allows light to pass through it. Spectacles are made for the purpose of viewing something and need to be made of transparent materials. Hence, glass is an ideal material for making spectacles.
Question 5.
A plastic soap-case floats on water, while the soap sinks. Why?
Answer:
The plastic soap-case floats on water because it is lighter than water. On the other hand, the soap sinks because it is heavier than water.
Question 6.
You are given a concentrated salt solution in water. How will you be able to dissolve more salt in this solution? Give reason for your answer.
Answer:
For dissolving more salt in a concentrated solution of salt in water the solution should be heated. Once the solution becomes warmer, more salt can be dissolved in it, because an increase in temperature decreases the concentration of a solute and more solute can be dissolved.
Question 7.
When a soft drink bottle is opened, it opens with a fizz. Why?
Answer:
When soft drink is packed, carbon dioxide gas is mixed along with it. Due to this, soft drinks are also known as carbonated drinks. Because of the presence of carbon dioxide gas, the soft drink bottle opens with a fizz.
IV. Projects.
Question 1.
Take two beakers of 50 ml capacity. At normal temperature, find the concentration of sugar and salt in water with the help of these beakers.
Answer:
Take 50 ml distilled water in each beaker. Mix sugar in one and salt in another beaker. Continue dissolving the solutes till concentration. Note down your observations.
Question 2.
List some pleasant and some bad everyday experiences because of diffusion.
Answer:
Do it yourself.