Chapter 2: Is Matter Around Us Pure? Application Questions | science Class 9 CBSE

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Chapter 2: Is Matter Around Us Pure? Application Questions | science Class 9 CBSE | ByteNotes.in

Application Question

Concept in a practical situation

Application

Question 1

Applied Concept

Q1. What is a solution? Name its types with one example each.

A solution is a homogeneous mixture of two or more substances.
Solid in liquid: sugar in water.
Gas in liquid: CO₂ in soda.
Liquid in liquid: alcohol in water.
Solutions have uniform composition throughout.

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Application Question

Concept in a practical situation

Application

Question 2

Applied Concept

Q2. Differentiate between a compound and a mixture (5 points).

Compound: Fixed composition; Mixture: Variable composition.
Compound: Components lose original properties; Mixture: Properties retained.
Compound: Cannot be separated physically; Mixture: Can be separated.
Compound: Formed by chemical reaction; Mixture: By physical mixing.
Compound: Homogeneous; Mixture: Can be homogeneous or heterogeneous.

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Application Question

Concept in a practical situation

Application

Question 3

Applied Concept

Q3. Define concentration of a solution. How is it expressed?

Concentration is the amount of solute in a given quantity of solvent or solution.
Expressed as mass percent or volume percent.
Formula: (Mass of solute / Mass of solution) × 100%.
Higher concentration means more solute per solvent.
Used in pharmaceuticals, industries, and laboratories.

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Application Question

Concept in a practical situation

Application

Question 4

Applied Concept

Q4. What is Tyndall effect? Which types of mixtures show it?

Tyndall effect is the scattering of light by particles in a mixture.
Seen in colloids, not in true solutions.
Helps distinguish between solutions and colloids.
Example: milk and water mixture shows Tyndall effect.
Useful in identifying particle size and uniformity.

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Application Question

Concept in a practical situation

Application

Question 5

Applied Concept

Q5. What is a saturated solution? How can it become unsaturated?

Saturated solution contains maximum solute at given temperature.
No more solute can dissolve at that temperature.
On heating, solubility increases, making it unsaturated.
Adding more solvent also makes it unsaturated.
This concept is temperature-dependent.

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Application Question

Concept in a practical situation

Application

Question 6

Applied Concept

Q6. Name methods to separate the following: (i) Cream from milk (ii) Salt from sea water (iii) Ammonium chloride from sand.

(i) Centrifugation — cream is lighter than milk.
(ii) Evaporation — water evaporates leaving salt behind.
(iii) Sublimation — ammonium chloride directly becomes gas.
Each method uses a specific physical property.
Effective in mixtures with different phases.

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Chapter sections

Chapter 2: Is Matter Around Us Pure? | Application Questions

Q1. What is a solution? Name its types with one example each.

Q2. Differentiate between a compound and a mixture (5 points).

Q3. Define concentration of a solution. How is it expressed?

Q4. What is Tyndall effect? Which types of mixtures show it?

Q5. What is a saturated solution? How can it become unsaturated?

Q6. Name methods to separate the following: (i) Cream from milk (ii) Salt from sea water (iii) Ammonium chloride from sand.

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