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Class 9 Science Chapter 2 Question Answers - Is Matter Around Us Pure?
Q1: Explain sublimation process with labelled diagram.
Ans: The process of converting solid form directly into vapour form is called sublimation. This is a reversible process.
Process :
(i) Take some camphor or ammonium chloride.
(ii) Crush the compound and put it in china dish.
(iii) Fit an inverted funnel over the china dish.
(iv) Put a cotton ball on the stem of the funnel.
(v) Heat the china dish slowly and observe.
Separation of ammonium chloride and salt by sublimation
Ammonium chloride is the molecule which on heating changes directly into gaseous state. When vapours of ammonium chloride collected then solid ammonium chloride is formed.
Observation : A change of state directly from solid to gas without changing into liquid state (or vice versa) is observed, this phenomenon is called sublimation.
Q2: What are colloids? Give their characteristics.
Ans: A colloid is a type of heterogeneous mixture where the particles are larger than those in a solution but too small to be seen with the naked eye. Examples include milk and smoke.
- Brownian Movement: Colloidal particles exhibit constant zigzag movement due to collisions with particles in the dispersing medium. They do not settle over time, indicating stability.
- Tyndall Effect: When light passes through a colloid, its path becomes visible. This occurs because colloidal particles scatter light in all directions.
Key characteristics of colloids include:
- Particles are too small to be seen individually.
- They scatter light, making the light path visible.
- Colloids remain stable and do not settle when undisturbed.
- They cannot be separated by filtration, but can be separated using centrifugation.
Colloidal solution
Q3: 110 g solution of salt is present in 550 g of solution. Calculate the concentration of solution.
Ans: Mass of solute = 110 g
Mass of solution = 550 g
% composition = 110 x 100 / 550
Concentration = 20% by mass
Q4: How much water should be mixed with 12 ml of alcohol to obtain 12% of alcohol? Calculate.
Ans:
Volume of solute = 12 ml
Concentration of solution = 12%
Volume of water = x
We know that
Concentration of solution = Volume of Solute / Volume of Solution x 100
100 = 12 + x
x = 100 – 12
x = 88 ml
Volume of water = 88 ml
Q5: Calculate the grams of NaCl (5.25% by mass) in 245 grams of a commercial bleach solution.
Ans:
Mass percent = Gram of solute / Gram of solution x 100
Solute (gram ) = Mass percent / Gram of solution x 100
= 5.25 x 245 / 100
= 12.9 g
Q6: Give difference between colloidal solutions and suspensions.
Ans:
Q7: Give difference between true solutions and colloidal solutions.
Ans: 
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FAQs on Class 9 Science Chapter 2 Question Answers - Is Matter Around Us Pure?
| 1. What is meant by 'pure matter'? |  |
| 2. How can we determine if a substance is pure? | |
Ans. To determine if a substance is pure, we can use methods like melting point determination, boiling point determination, and chromatography. Pure substances have specific melting and boiling points, while mixtures may show a range of temperatures.
| 3. What are the different types of mixtures? | |
Ans. Mixtures can be classified into two main types: homogeneous and heterogeneous. Homogeneous mixtures have a uniform composition throughout, like saltwater, while heterogeneous mixtures have distinct, separate components, like a salad or oil and water.
| 4. Why is it important to understand the purity of matter? | |
Ans. Understanding the purity of matter is crucial in various fields, including chemistry, pharmaceuticals, and food science. It ensures the safety and efficacy of products, helps in quality control, and aids in research and development.
| 5. Can pure substances be separated into simpler substances? | |
Ans. No, pure substances cannot be separated into simpler substances by physical means. However, compounds can be broken down into their constituent elements through chemical reactions, while elements are already the simplest form of matter.
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