Class 6 Science Chapter 5 question answer
Today I am sharing class 6 Science Chapter 5 question answer. Separation of substances. Hope it helps!
Very short answer questions
1. Which method is used to separate grains from stalk?
ANSWER: Threshing is used to separate grains from stalk by beating them on the ground (manual threshing) or by a machine (thresher). There are two types of threshing:
(a) manual threshing
(b) thresher
2. Give an example from our daily life where the process of sedimentation and decantation are used.
ANSWER: Sedimentation is the process of settling down of heavier insoluble particles at the bottom of a liquid. Decantation is the process of pouring out of clear liquid after sedimentation. Examples in our daily life are:
(a) Settling of rice in a glass of water
(b) Settling of tea leaves in a cup of tea.
3. Name any two processes used to separate soluble components from a mixture.
ANSWER: (a) Evaporation is used to separate soluble solids from a mixture. Example: separation of salt from seawater.
(b) Condensation is used to separate liquid from a mixture. Example: separation of water from salt and water solution.
4. Name the method by which we can separate seeds and pulp from the fruit juice.
ANSWER: By filtration
5. What is meant by condensation?
ANSWER: Condensation is the process of changing solid into its liquid state on cooling. It is used to separate liquid from a mixture. Example: separation of water from salt and water solution.
6. What are the two types of mixtures?
ANSWER: Two types of mixtures are homogenous mixtures and heterogenous mixtures.
Short answer questions.
1. (a) Why is water called the universal solvent?
ANSWER: Water is called as universal solvent because it dissolves many substances such as salt, sugar etc.
(b) Define solubility. How can it be increased in water.
ANSWER: The extent to which a substance gets dissolved in a liquid is called its solubility. Solubility of solid solute can be increased with rise in temperature.
2. (a) Define sedimentation
ANSWER: Sedimentation is the process of settling down of heavier insoluble particles at the bottom of a liquid.
(b) Define decantation
ANSWER: Decantation is the process of pouring out of clear liquid after sedimentation.
3. Can water dissolve any amount of a substance? Explain.
ANSWER: No, water cannot dissolve any amount of substance. Saturated solution cannot dissolve in water. Saturated solution is the solution in which no more substance can be dissolved at a given temperature.
By increasing temperature, it can dissolve saturated substance.
4. What is loading?
ANSWER: Loading is the process of increasing the rate of sedimentation in a suspension by adding chemical to it. For example, by adding alum muddy water, alum entangles with suspended particles and thus makes it heavier. Thus, heavier particles settles down easily.
5. What is the difference between filtrate and residue?
ANSWER: The clear water that that passes through the filter paper is called filtrate. The mud that cannot pass through the filter paper and remain behind is called residue.
6. Soni is helping her mother and accidentally she mixes the arhar dal with gram seeds and rice fluor. Her brother helps her in separating the things from each other.
(a) Which method they would have used to separate things?
ANSWER: Handpicking method
(b) What value do you learn from Soni’s brother?
ANSWER: We should help each other.
Long answer questions.
1. (a) How will you separate the following
ANSWER: mustard seeds and common salt- Filtration and evaporation. As mustard seeds do not dissolved in water, separated by filtration. Common salt dissolves in water so separated by evaporation.
chalk powder and water- Filtration as chalk powder is insoluble in water.
sand and water- by sedimentation and decantation as sand is heavier.
grains and stones- handpicking
2. How will you obtain clean water from the sample of muddy water?
ANSWER: We obtain clean water from the sample of muddy water by the process of filtration.
Method: Pour muddy water into the funnel in which cone shaped filter paper is placed.
Observation: We obtain clear water when passes through filter paper. The clear water that that passes through the filter paper is called filtrate. The mud that cannot pass through the filter paper and remain behind is called residue.
3. What happens if a saturated solution of a substance and water is
ANSWER: (a) heated – Saturated solution cannot dissolve in water. Saturated solution is the solution in which no more substance can be dissolved at a given temperature.
By heating or by increasing temperature, solubility of substance increases thus, saturated substance will be dissolved.
(b) cooled- the solubility of a substance decreases and dissolved substances will separate in the form of crystals.
4. (a) Why do we need separate substances from a mixture?
ANSWER:(a) to remove harmful substances such as we need to remove stones and insects that are harmful to us from the food grains.
(b) to remove undesirable substances such as we need to remove tea leaves that are undesirable substance from prepared tea.
(c) to obtain useful components such as we need to separate components of petroleum from th crude petroleum.
(b) Differentiate between homogeneous and heterogeneous mixture with examples.
ANSWER:
HOTS (Higher Order Thinking Skills) questions.
1. How will you separate a mixture of sand and sugar?
ANSWER: We separate mixture of sand and sugar by decantation, filtration, evaporation and condensation.
Method: Add water to the mixture of sand and sugar. sugar dissolves in water and sand is insoluble in water.
Insoluble sand can be separated by sedimentation and decantation. Sedimentation is the process of settling down of heavier insoluble particles at the bottom of a liquid. Decantation is the process of pouring out of clear liquid after sedimentation.
Soluble sugar can be separated from water by evaporation and condensation.
Evaporation is the process in which liquid changes into vapour forms. Condensation is the process of changing solid into its liquid state on cooling. It is used to separate liquid from a mixture. Example: separation of water from salt and water solution.
2. Can a farmer use a pedestral fan to do a winnowing? Comment.
ANSWER: Yes, farmer can use a pedestral fan to do winnowing as winnowing is a method of separating heavier and lighter components of a mixture by blowing air or wind.
Application based questions: Class 6 Science Chapter 5 question answer
1. Your mother want to remove pieces of wheat grains from a large quantiy of flour. Find out how she can do that quickly.
ANSWER: She can use sieve to remove pieces of wheat grains from a large quantiy of flour. Sieving is the method of separating the components of a mixture that are of different sizes by using a sieve.
2. Ruchika’s mother went to market to buy fruits and vegetables. Which method did she use to select the best vegetables and fruits in the market?
ANSWER: To select the best vegetables and fruits in the market, she can use hand picking method.
Practical skill based question: Class 6 Science Chapter 5 question answer
1. How will you increase the rate of sedimentation?
ANSWER: To increase the rate of sedimentation, loading method can be used. Loading is the process of increasing the rate of sedimentation in a suspension by adding chemical to it. For example, by adding alum muddy water, alum entangles with suspended particles and thus makes it heavier. Thus, heavier particles settles down easily.
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