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

ByteNotes

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

Short Answer

Direct answer format

Short Answer

Question 1

Quick Recall

Q1. What is a pure substance?

A substance made of only one kind of particle.
It has uniform and definite composition.
Examples: water, iron, oxygen.

ByteNotes

Short Answer

Direct answer format

Short Answer

Question 2

Quick Recall

Q2. What is a solution?

A homogeneous mixture of two or more substances.
Solute dissolves completely in the solvent.
Example: salt in water.

ByteNotes

Short Answer

Direct answer format

Short Answer

Question 3

Quick Recall

Q3. Give two examples of colloids.

Milk – liquid in liquid colloid.
Fog – liquid in gas colloid.
Both show Tyndall effect and are stable mixtures.

ByteNotes

Short Answer

Direct answer format

Short Answer

Question 4

Quick Recall

Q4. Define solute and solvent.

Solute – substance dissolved (e.g., salt).
Solvent – substance in which solute dissolves (e.g., water).
Together they form a solution.

ByteNotes

Short Answer

Direct answer format

Short Answer

Question 5

Quick Recall

Q5. Name two separation techniques for heterogeneous mixtures.

Filtration – separates insoluble solids.
Magnetic separation – removes magnetic materials.
Other methods include decantation and hand picking.

ByteNotes

Short Answer

Direct answer format

Short Answer

Question 6

Quick Recall

Q6. What is Tyndall effect?

Scattering of light by particles in colloid.
Makes light beam visible in mixture.
Not observed in true solutions.

ByteNotes

Short Answer

Direct answer format

Short Answer

Question 7

Quick Recall

Q7. Define suspension.

Heterogeneous mixture with visible solid particles.
Particles settle when left undisturbed.
Example: chalk in water.

ByteNotes

Short Answer

Direct answer format

Short Answer

Question 8

Quick Recall

Q8. What is the difference between solubility and saturation?

Solubility – amount of solute that dissolves at a temperature.
Saturation – solution can’t dissolve more solute.
Saturation depends on solubility.

ByteNotes

Short Answer

Direct answer format

Short Answer

Question 9

Quick Recall

Q9. Give one example of each: element and compound.

Element – Oxygen (O₂).
Compound – Carbon dioxide (CO₂).
Element contains one atom type; compound has multiple.

ByteNotes

Short Answer

Direct answer format

Short Answer

Question 10

Quick Recall

Q10. What is a heterogeneous mixture?

Mixture with non-uniform composition.
Components are visible and separate.
Examples: oil and water, soil.

ByteNotes

Chapter sections

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

Q1. What is a pure substance?

Q2. What is a solution?

Q3. Give two examples of colloids.

Q4. Define solute and solvent.

Q5. Name two separation techniques for heterogeneous mixtures.

Q6. What is Tyndall effect?

Q7. Define suspension.

Q8. What is the difference between solubility and saturation?

Q9. Give one example of each: element and compound.

Q10. What is a heterogeneous mixture?