Question

D. LONG-ANSWER QUESTIONS: Answer these questions,
1. What is the difference between homogeneous and heterogeneous mixtures? Give an example
of each mixture.
2. List three properties of mixtures.
3. Give two situations where it is necessary to separate a mixture into its constituents.
4. Draw a labelled diagram to show the arrangement used to filter a mixture of a liquid and an
insoluble solid
5. Draw a labelled diagram of the apparatus used to distil out pure water from a solution
6. How will you separate a mixture of grass, pebbles and sand?
7. Explain with the help of a diagram how can a mixture of oil and water be separated,
8. Why is water considered as an important solvent?

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Answer 1

Here are your answers---

ANS 1• HETEROGENEOUS MIXTURE:

A mixture with a non-uniform composition. The composition varies from one region to another with at least two phases that remain separate from each other, with clearly identifiable properties. components.

Examples of Heterogeneous Mixtures:Mixture of nan aggregate: cement, and water.

•HOMOGENEOUS MIXTURE:An mixture appears uniform, regardless of where you sample it. Examples of homogeneous mixtures include air, saline solution, most alloys, and bitumen.

ANS 2• These are three properties of mixture-

1. They can either be heterogeneous or homogeneous in nature.
2. The proportions of the substances vary in an indefinite manner.
3. The constituents of the mixture can be separated by physical methods.

ANS 3 •Two situations where it is necessary to separate mixture into its continents are:

• Two situations where it is necessary to separate mixture into its continents are:Separating tea leaves from tea.

• Separating oil from water.

ANS 6• We will separate a mixture of sand pebbles and grass.

• grass - winnowing
• grass - winnowingsand - winnowing
• grass - winnowingsand - winnowingpebbles - handpicking .

ANS 8• Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any. other liquid. This allows the water molecule to become attracted to many other different types of molecules.

Answers 4 ;5; and 7 are in attachment....

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Answer 2

Answer:

Answer 1 :- Homogeneous Mixture: It is a mixture in which different constituents are mixed uniformly and these constituents cannot be easily separated.

Example: Sugar solution, soda, water, soft drinks, vinegar, air, etc.

Heterogeneous mixtures: It is a mixture in which different constituents are not mixed uniformly and the constituents can be easily seen and can be easily separated.

Example: Sugar and sand mixture, milk, ink, paint, wood, blood, etc.

Answer 2 :- Mixtures can be classified on the basis of particle size into three different types: solutions, suspensions, and colloids.

Answer 3 :- It is necessary to separate a mixture into its constituents for the following situations:

Removing undesirable constituents: For example, it is desirable to remove small stones in rice, or separating tea leaves from tea.

To obtain useful substances: Butter is obtained by churning curds.

Answer 6 :- Use a considerably fine sieve ( the one used in the kitchen sometimes will do good :) ) to seperate sand from the mix of grass and pebbles. Sand will filter through the sieve while grass and pebbles stay. Now take the mix of grass and pebbles in a beaker and fill it with water.

Answer 7 :- Separating funnel is used to separate the mixture of two immiscible liquids. Kerosene oil and water do not mix with each other and form two separate layers. ... The heavier liquid (water) forms the lower layer whereas the lighter liquid forms the upper layer (kerosene). Thus, the water is first collected in the beaker.

Answer 8 :- Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. ... This allows the water molecule to become attracted to many other different types of molecules.

Answer No. 4 and 5 are in attachment

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