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Solutions ⇒ Class 9th ⇒ Science ⇒ 2. Is Matter around us Pure

Solutions 2. Is Matter around us Pure - Additional -Questions | Class 9 Science - Toppers Study

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Solutions 2. Is Matter around us Pure - Additional -Questions | Class 9 Science - Toppers Study

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Chapter 2 Science class 9

Additional -Questions class 9 Science Chapter 2. Is Matter around us Pure

2. Is Matter around us Pure

| Additional -Questions |

Solutions 2. Is Matter around us Pure - Additional -Questions | Class 9 Science - Toppers Study


Additional -Questions

Que: - What is solution?

Ans: - A solution is a homogeneous mixture of two or more substances. Ex. – lemonade and soda water etc.

Que:- What  is mixture ?

Ans:- A mixture is a combination of two or more substances which show the properties of each of the substance combined. A mixture of iron powder and sulphur show the properties of both sulphur and iron.

Que: - write the type of mixture? Difined them ?

Ans: -

  1. Homogenous mixtureMixture having uniform composition are called homogeneous mixture.
  2. Heterogeneous mixture - – those mixture that do not have uniform composition are called heterogeneous mixture

Que: - Write the type of solution?

Ans: -  There are three type :-

  1. Colloidal solution
  2. Concentration solution
  3. Suspension

Que: - What is suspension?

Ans: - suspension is a heterogeneous mixture which solids are dispersed in liquids are called suspension.

Que: - What is solute?

Ans: - The component of the solution that is dissolved in the solvent (usually present in lesser quantity) is called

the solute.

Que: - Write the properties of a solution?

Ans: - Properties of a solution

  1. A solution is a homogeneous mixture.
  2. The particles of a solution are smaller than 1 nm.
  3. They cannot be seen by naked eyes.
  4. They do not scatter a beam of light passing through the solution.
  5. The path of light is not visible in a solution.
  6. The solute particles cannot be separated from the mixture by the process of filtration.

 

Que : - Write the properties of suspension.

Ans : - The properties of suspension.

  1. Suspension is a heterogeneous mixture.
  2. The particles of a suspension can be seen by the naked eye.
  3. The particles of a suspension scatter a beam of light passing through it and make its path visible.
  4. They can be separated from the mixture by the process of filtration.

Que:-  Write the properties of a colloid ?

Ans: -  The properties of a colloid

  1. A colloid is a heterogeneous mixture.
  2. The size of particles of a colloid is too small to be individually seen by naked eyes.
  3. Colloids are big enough to scatter a beam of light passing through it and make its path visible.
  4. They do not settle down when left undisturbed, that is, a colloid is quite stable.

Que : - What is solubility?

Ans;  - The amount of the solute present in the saturated solution at this temperature is called its solubility.

Que:  - Write the type of solution? Define them ?

Ans: -

  1. Saturated solution –  When no more solute can be dissolved in a solution at a given temperature, it is called a saturated solution.
  2. Unsaturated solution – The amount of solute contained in a solution is less than the saturation level, it is called an unsaturated solution.

Que: - What is solvent ?

Ans;- The component of the solution that dissolves the other component in it (usually the component present in larger amount) is called the solvent.

Que: What is decantation?

Ans:      The process of separating a solid from a liquid by pouring out the liquid is known as decantation.

Que:- What is dilute ?

Ans:- Depending upon the amount of solute present in a solution, it can be called a dilute.

Que: - How can we separate cream from milk?

Ans: - By the centrifugation.

Que; - What is chromatography?

Ans: - This process of separation of components of a mixture is known as chromatography.

Que: - What is chemical change ?

Ans:- Chemical change brings change in the chemical properties of matter and we get new substances. A chemical change is also called a chemical reaction.

Que:- How can we separate mixture of two imscible liquid?

Ans:-By distillation.

Que:- How can we separate a mixture of salt and ammonium chcoride?

Ans:- By susblimation

Que:-What is crystallization?

Ans:- Crystallisation is a process that separates a pure solid in the form of its crystals from a solution.

Que:- Write the difference between  a pure substance and a mixture?

Ans: -

 

Que:-What are the types of pure substance?

Ans; -  There are two types :-

  1. Element
  2. Compound

Que: What is element?

Ans: An element is a pure substances of matter. Which can’t be broken down into simpler substances by chemical method.

Ex. -  copper, Iron, Alumunium, Oxygen, nitrogen etc.

Que: Write the types of element and define them ?

Ans:  Element can be normally divided into metal non-metal and metalloids.

1. Metal:-

2. Non metal -

3. Metalloids:- some elements have intermediate properties between those of metals and non-metals they are called metalloids examples: are boron, silicon germanium etc.

Que: Write the properties of metal and non-metal? 

 Ans: Metals usually show some or all of the following properties:

 metal-

• They have a lustre (shine).

• They have silvery-grey or golden-yellow colour.

• They conduct heat and electricity.

• They are ductile (can be drawn into wires).

• They are malleable (can be hammered into thin sheets).

• They are sonorous (make a ringingsound when hit).

  Non metal:-

 Non-metals usually show some or all of the following properties:

• They display a variety of colours.

• They are poor conductors of heat and electricity.

• They are not lustrous, sonorous or malleable.

Que- What is compound?

Ans- A compound is a substance composed of two or more elements, chemically combined with one another in a fixed proportion.

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Study Materials List:

Solutions ⇒ Class 9th ⇒ Science
1. Matter in Our Surroundings
2. Is Matter around us Pure
3. Atoms and Molecules
4. Structure of The Atom
5. The Fundamental Unit of Life
6. Tissues
7. Diversity in Living Organisms
8. Motion
9. Force and Laws of Motion
10. Gravitation
11. Work and Energy
12. Sound
13. Why Do We Fall ill
14. Natural Resources
15. Improvement in Food Resources

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