Physical and Chemical Changes Quiz - ICSE Class 6 Chemistry
Free practice quiz: Physical and Chemical Changes (ICSE Class 6 Chemistry). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following is an example of a physical change where no new substance is formed?
- Burning of wood
- Rusting of iron
- Melting of ice
- Digestion of food
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Answer: C. Melting of ice
Melting of ice is a physical change because water changes its state from solid to liquid, but its chemical composition (H2O) remains the same. Burning wood, rusting of iron, and digestion of food involve the formation of new substances.
Which of the following changes results in the formation of a gas and a new substance?
- Melting of wax
- Freezing of water
- Dissolving sugar in water
- Burning of a candle
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Answer: D. Burning of a candle
Burning a candle is a chemical change where the wax reacts with oxygen, producing new substances like carbon dioxide, water vapor, and ash, and releasing heat and light. It can also produce smoke (fine particles). Melting of wax, freezing of water, and dissolving sugar are physical changes.
Which of the following is an example of a change in which no new substance is formed, but the appearance changes?
- Rusting of iron
- Cooking an egg
- Shredding paper
- Digestion of food
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Answer: C. Shredding paper
Shredding paper is a physical change. The paper is cut into smaller pieces, changing its form and appearance, but it remains paper (cellulose). Rusting, cooking, and digestion involve chemical reactions and the formation of new substances.
The change in the state of matter from solid to liquid is called melting. This is a:
- Chemical change
- Physical change
- Irreversible change
- Combustion
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Answer: B. Physical change
Melting is a physical change because the substance changes its state from solid to liquid but its chemical composition remains the same. For example, ice (solid water) melts into liquid water, and both are H2O.
Which of the following is an example of a change that occurs due to heat and is chemical in nature?
- Melting of ice
- Boiling water
- Burning of paper
- Evaporation of water
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Answer: C. Burning of paper
Burning of paper is a chemical change that involves combustion, producing new substances like ash, carbon dioxide, and water vapor, along with heat and light. Melting, boiling, and evaporation are physical changes.