DAV Class 6 Science Book Solution Chapter 4

DAV Class 6 Science Book Solution Chapter 4 Separation of Substances teaches you to solve different kinds of questions that can be asked on the topic included in Separating the Components of Mixtures. This study material is important for your DAV Class 6 Science examination. To score good marks in exam, we recommend studying the solution thoroughly.

DAV Class 6 Science Book Solution Chapter 4

DAV Class 6 Science Book Solution Chapter 4 is a crucial study source that will help you to clear all doubts that occur while studying the DAV syllabus Chapter 4 of Class 6 Science. Fill in the blanks, Match the following, Tick the correct option, Answer the following questions in brief and Answer the following questions and their answers will help you clear the concepts.

Highlights

• A. Fill in the blanks.
• B. Match the following:
• C. Tick the correct option.
• D. Answer the following questions in brief.
• E. Answer the following questions.

A. Fill in the blanks.

1. Housewives sometimes use the method of ___________ to remove unwanted substances from eatables like rice and pulses.

2. Common salt is prepared on a large scale through the process of ___________.

3. Separation of tea leaves from tea is done by a process called ___________.

4. The process of ___________ can be used to increase the rate of sedimentation of the suspended particles in a solid-liquid mixture.

5. The method, used to separate the fine particles, suspended in a liquid, by rotating the mixture at high speed, is known as ___________.

Answer: (1) hand picking (2) evaporation (3) filtration (4) loading (5) centrifugation

B. Match the following:

Answer:

1. Wind – winnowing

2. Chalk powder and water – sedimentation

3. Oil and water – separating funnel

4. separating peas from cooked pulao – hand picking

5. Muslin cloth – filtration

6. Camphor and salt – sublimation

C. Tick the correct option.

Answer:

D. Answer the following questions in brief.

1. Name any three methods used for separating a solid-solid mixture.

Answer: (1) Hand picking (2) winnowing (3) Magnetic separation

2. What is winnowing? Give an example of a mixture whose components can be separated by this method.

Answer: The process of separation of lighter particles from heavier ones by wind.

Example: Separation of husk from wheat

3. Some iron pins get scattered on the carpet when you are expecting guests. How can one collect all the pins in the shortest possible time?

Answer: By the process of Magnetic separation.

4. Name any three substances which sublime on heating.

Answer: (1) camphor (2) iodine (3) naphthalene

5. What is crystallisation? Name any three substances which can be purified using this technique.

Answer: Crystallisation is the process which separates a pure solid in the form of its crystals, from a saturated solution.

Salt, alum and blue vitriol are purified using crystallisation.

E. Answer the following questions.

1. Differentiate between a pure substance and a mixture. Give two examples of each.

Answer:

Pure Substance – It is made up of only one type of substance.

Example: Gold, Pure Water

Mixture – A mixture is made up of two or more substance are mixed together in any proportion.

Example: Sand, Air

2. State the difference between heterogeneous and homogeneous mixtures. Give two examples of each type.

Answer:

Heterogeneous mixture – A heterogeneous mixture is that which does not have the same composition throughout, that is, its components are not uniformly distributed.

Example: Mixtures of sand in water, iron nails in sulphur powder.

Homogeneous mixture – A homogeneous mixture is that which has the same composition throughout, that is, its components are uniformly distributed.

Example: A solution of salt or sugar in water, soft drinks.

3. Can a mixture of iodine and camphor be separated by the sublimation method? Give reason for your answer.

Answer:

No, we cannot use sublimation method for a mixture of Iodine and camphor. As we know that sublimation is the process in which solid directly converted into gas.

As the camphor and iodine are sublime compound. So, upon heating both goes to gaseous state. And then in gas form we can’t identify which one of them is iodine or camphor.

4. Why does the size of naphthalene balls, put in open, keep on reducing with time?

Answer:

The size of Naphthalene balls, put in open, keep on reducing with time because of sublimation. It directly changes into gaseous state because naphthalene put in open and get heat from our surrounding, and this heat sublime the naphthalene. 

5. After a dust storm, how does rain help in making air clear?

Answer: Rain droplets loads the dust particles and makes them heavier, so dust particles settled down on land and air becomes clear.

6. Sawdust, mixed in water, cannot be separated by the sedimentation method. Why?

Answer:

As the sawdust is lighter so it floats. But in sedimentation the substance used to settle down in water. Whereas the sawdust will not settle down in water when the mixture of sawdust and water is kept undisturbed. So, sawdust cannot be separated by the process of sedimentation.

7. The filtration method cannot be used to separate sugar and salt mixed in water. Why?

Answer: Filtration is a method that is used to separate insoluble solids from a liquid. Since salt and sugar both dissolve in water, filtration cannot be used to separate salt and sugar.

8. Describe the method of centrifugation using an appropriate example.

Answer:

It is a method, used to separate the fine particles suspended in a liquid, by rotating the mixture at high speeds. Centrifugation is done with the help of a machine called the centrifuge. The heavier particles tend to settle down at the bottom of the container while the lighter ones stay at the top. Separating cream from milk, by churning it, is an example of centrifugation.

Class 6 DAV Solutions for Science Chapter 4 – Separation of Substances

Chapter 4 of DAV Class 6 Science introduces you to methods of separation such as hand-picking, threshing, winnowing, sedimentation, sieving, decantation, filtration and evaporation.

DAV Solutions for Class 6 Science Chapter 4 Separation of Substances: Important topics

• Mixtures
• Types of Mixtures
• Separating the Components of Mixtures
• Mixtures of solids with solids.
• Mixtures of solids with liquids.
• Mixtures of liquids with liquids.

Frequently Asked Questions on DAV Class 6 Science Book Solution Chapter 4