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ICSE Class 8 Physical and Chemical Changes — practice questions

Explore 10 free Physical and Chemical Changes questions in ICSE Class 8 Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Physical and Chemical Changes questions and exercises with answers

Showing questions 1–10 of 10.

Paper is torn without burning. Which description fits?Read the answer and worked solution →Crystal shape changes, but composition does not. The change is?Read the answer and worked solution →A candle's wax melts and its vapour burns. These changes are?Read the answer and worked solution →After a candle is put out, liquid wax sets. What is reversed?Read the answer and worked solution →Why is milk becoming curd a chemical change?Read the answer and worked solution →Compare an egg cracking and its contents rotting. They are?Read the answer and worked solution →Iron becomes magnetised without reacting. What changes?Read the answer and worked solution →A pendulum repeats its motion at regular intervals. It is?Read the answer and worked solution →Water is split into hydrogen and oxygen. Why is this chemical?Read the answer and worked solution →Rust is scraped off iron. Has scraping reversed rust formation?Read the answer and worked solution →

Worked practice questions

Paper is torn without burning. Which description fits?

  1. Chemical and easy to undo
  2. Physical and hard to undo
  3. Chemical and hard to undo
  4. Physical with a new substance
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Correct answer: B. Physical and hard to undo

Tearing alters a sheet's size and shape without making a new substance, even though restoring it is difficult.

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Crystal shape changes, but composition does not. The change is?

  1. Chemical because a solid forms
  2. Chemical because crystals differ
  3. Physical because composition stays
  4. Chemical because shape changes
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Correct answer: C. Physical because composition stays

Different crystal shapes can represent the same chemical substance, so a shape change alone is physical.

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A candle's wax melts and its vapour burns. These changes are?

  1. Physical, then chemical
  2. Chemical, then physical
  3. Both chemical changes
  4. Both physical changes
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Correct answer: A. Physical, then chemical

Melting changes wax's state, while burning combines its vapour with oxygen to form new substances.

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