Official Class 8 Science Worksheets: Physical and Chemical Changes
Access comprehensive chapter-wise worksheets for Physical and Chemical Changes using the CBSE Class 8 Science Physical and Chemical Changes Worksheet Set 06. Designed to align with the 2026-27 academic syllabus for Class 8 Science, these printable practice sets help students reinforce key concepts and improve their overall exam readiness.
Solved Practice Worksheets for Science
Access the complete worksheet PDF for Class 8 Science below. Regular practice with these targeted academic tasks builds familiarity with standard question patterns and helps secure higher marks in final school examinations.
A. Keywords
1. Define: chemical change, physical change, products, reactants.
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Answer: Chemical change: a change in which a new substance with new properties is formed; it is permanent. Physical change: a change in which only the physical properties (shape, size, state) change and no new substance forms. Reactants: substances that take part in a chemical reaction. Products: new substances formed in a chemical reaction.
Teacher's Note: Learn these four definitions.
B. Multiple Choice Questions
(i) Which is NOT a characteristic of physical change? (a) formation of new substance (b) reversible (c) temporary (d) change in physical properties
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Answer: (a) Formation of a new substance.
Teacher's Note: No new substance forms in a physical change.
(ii) A physical change involves (a) no change in energy (b) energy absorbed (c) energy released (d) none
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Answer: (d) None of these; physical changes involve little or no energy change, though some energy may be absorbed or released slightly (for example during melting). The usual book key is (d).
Teacher's Note: The big energy change belongs to chemical change.
(iii) Which is NOT a chemical change? (a) photosynthesis (b) digestion (c) tearing a paper (d) rusting of iron
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Answer: (c) Tearing a paper.
Teacher's Note: Only the shape changes.
(iv) A characteristic of chemical change is (a) permanent (b) reversible (c) no energy change (d) composition does not change
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Answer: (a) Permanent.
Teacher's Note:
C. Fill in the Blanks
1. Physical changes are ____ and can be ____ by changing the conditions. 2. Chemical changes cannot be reversed by simple ____ methods. 3. A new product formed is different from the original substance in respect of ____ and properties. 4. Chemical changes involve either ____ or ____ of energy.
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Answer: 1. temporary, reversed; 2. physical; 3. composition; 4. absorption, release.
Teacher's Note:
D. True or False
1. Physical changes are permanent and cannot be reversed. 2. Chemical changes involve significant energy changes. 3. Products of a chemical reaction have the same properties as the reactants. 4. Sublimation of camphor is a physical change.
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Answer: 1. False; 2. True; 3. False; 4. True.
Teacher's Note:
E. One Word Answers
1. Phase change from solid to gas without a liquid phase. 2. Substances that react in a chemical reaction. 3. Substances formed in a chemical reaction. 4. A reaction that releases heat. 5. Another name for chemical change.
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Answer: 1. Sublimation; 2. Reactants; 3. Products; 4. Exothermic reaction; 5. Chemical reaction.
Teacher's Note:
F. Classification
9. Classify into physical and chemical changes: burning of paper, photosynthesis, breaking a glass tumbler, sublimation of camphor, curdling of milk, digestion, cooking of food, conversion of liquid water into vapour, rotting of eggs, ripening of fruit, decaying of leaf.
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Answer: Physical: breaking a glass tumbler, sublimation of camphor, conversion of liquid water into vapour. Chemical: burning of paper, photosynthesis, curdling of milk, digestion, cooking of food, rotting of eggs, ripening of fruit, decaying of leaf.
Teacher's Note: Ask: is a new substance formed?
G. Answer the Following
1. What is a physical change? Give two examples.
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Answer: A change in which only physical properties such as shape, size, colour or state change and no new substance is formed. Examples: melting of ice and dissolving sugar in water.
Teacher's Note:
2. Define sublimation. Why is the sublimation of camphor a physical change?
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Answer: Sublimation is the change of a solid directly into a gas on heating without becoming a liquid. On cooling, the vapour becomes solid camphor again, so no new substance is formed; it is therefore a physical change.
Teacher's Note:
3. What is a chemical reaction? Give an example.
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Answer: A chemical reaction is a process in which one or more substances are changed into new substances. Example: iron + oxygen + water gives rust (hydrated iron oxide).
Teacher's Note:
4. Explain how the total mass remains unchanged in a chemical change.
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Answer: In a chemical change atoms are only rearranged; none are created or destroyed. So the total mass of the reactants equals the total mass of the products. This is the law of conservation of mass.
Teacher's Note:
5. Write any three characteristics each of physical and chemical changes.
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Answer: Physical: temporary, usually reversible, no new substance. Chemical: permanent, a new substance forms, energy is absorbed or released, and often there is a colour change, gas, heat or light.
Teacher's Note:
6. Differentiate between physical and chemical change.
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Answer:
| Physical change | Chemical change |
|---|---|
| No new substance forms | A new substance forms |
| Usually reversible | Usually not reversible |
| Little or no energy change | Large energy change |
| Example: melting of wax | Example: burning of wax |
Teacher's Note:
Free study material for Science
Physical and Chemical Changes Printable Worksheets and Exercises for Class 8 Science
Download Chapter Worksheets: Class 8 Science
Access structured practice worksheets for Physical and Chemical Changes aligned with the 2026 CBSE curriculum. These downloadable exercises for Class 8 Science help students build accuracy and reinforce core concepts for upcoming school tests.
Concept Clarification for Physical and Chemical Changes
Built using official NCERT guidelines for Class 8 Science, these practice sheets provide reliable academic support. Cross-reference your completed work with our detailed solutions to learn standard answer-writing formats for CBSE exams.
Effective Revision Strategies for School Exams
Follow up your worksheet practice by attempting the interactive online MCQ tests for Physical and Chemical Changes to evaluate your execution speed. All printable assignments and revision sheets on our platform are updated for the 2026 session and available free of charge.
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