CBSE Class 9 Science Worksheet Set 04

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Revision Assignment -CHEMISTRY
Class: IX
 
Ch1- Matter in our surroundings
 
 
1. Camphor disappears without leaving any residue. Explain?
 
2. Why do we feel cool when we touch a piece of ice?
 
3. What is Latent Heat of Fusion?
 
4. Define latent heat of Vaporization?
 
5. How can you show that evaporation causes cooling?
 
6. How can you justify that table is a solid?
 
7. Arrange the following in decreasing order of force of attraction: Water, Salt, Oxygen, and give reasons.
 
8. What are the characteristics of matter?
 
9. The smell of hot sizzling food reaches you several meters away, but to smell the cold food you have to go close. Why?
 
10. After rains, the rain drops dry away easily- on a sunny day or on a cloudy day? Give reasons.
 
11. How can matter change its state?

Ch 2-Is Matter Around Us Pure
 
1. Explain how will you separate two immiscible liquids?
 
2. What is water called a universal solution?
 
3. Give the differences between true solution, colloidal solution and suspension?
 
4. Draw a diagram to show the separation of ammonium chloride from sand .
 
5. Give two applications of centrifugation.
 
6. How can you prove that water is a compound?
 
7. How can we convert saturated solution into unsaturated by heating?
 
8. How to differentiate between sol, solution and suspension?
 
9. What is meant by chromatography?
 
10. Define emulsion with example.
 
11. What is Tyndall effect?

Ch 3-Atoms and Molecules
 
1. Define polyatomic ion. Give one example.
 
2. What is formula unit of mass? How is it different from molecular mass?
 
3. What is Law of conservation of mass and Law of constant proportions?
 
4. What is an ion? Explain the types of ion with examples.
 
5. Find the molecular mass of H2O.
 
6. Define the term valency. What is the valency for magnesium and copper?
 
7. What is the difference between cation and anion?
 
8. What is atomicity? What is the atomicity of phosphorus and nitrogen?
 
9. Find the number of atoms in 0.5 mole of C atom.
 
10. Find the mass of 1.5 mole of CO2 molecule.
 
11. Calculate the formula unit mass of NaCl and CaCl2.
 
12. What is the difference between molecules 2O and O2?

Ch 4-Structure of the Atom
 
1. Give difference between isotopes and isobars.
 
2. Number of protons and electrons are same in an atom. Then why is it wrong to say that atomic number of an atom is equal to its number of electrons.
 
3. An atom is electrically neutral, on loss or gain of electrons why does it become charged?
 
4. What is valency?
 
5. According to you, among the structure of atom studies which model is correct and why?
 
6. Give an activity to understand the implications of Rutherford’s α scattering experiment by a gold foil.
 
7. Explain Rutherford’s α-particle scattering experiment and give its observation and conclusion drawn.
 
8. Establish the relationship between atomic number, mass number, isotopes, isobars and valency of an atoms.
 
 
 
Please click on below link to download CBSE Class 9 Science Worksheet Set D

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Exam Preparation Worksheet for Class 9 Science All Chapters

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Are these Science Class 9 worksheets based on the 2026-27 competency-based pattern?

Yes, our CBSE Class 9 Science Worksheet Set 04 includes a variety of questions like Case-based studies, Assertion-Reasoning, and MCQs as per the 50% competency-based weightage in the latest curriculum for Class 9.

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Daily practice with these Science worksheets helps in identifying understanding gaps. It also improves question solving speed and ensures that Class 9 students get more marks in CBSE exams.

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