Grade 7 Chemistry

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Questions and Answers

Which of the following is NOT a characteristic of matter?

  • It has mass and takes up space
  • It does not undergo any changes (correct)
  • It can exist in three states: solid, liquid, and gas
  • It can be broken down into simpler substances

Which of the following is an example of a chemical change?

  • Mixing of salt and water
  • Boiling of water
  • Melting of ice
  • Burning of wood (correct)

Which of the following is an example of a physical change?

  • Rusting of iron
  • Burning of paper
  • Mixing of sugar and water
  • Cooking an egg (correct)

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Study Notes

Characteristics of Matter

  • Matter has mass, which is a measure of its amount
  • Matter takes up space and has volume
  • Matter can exist in different states (solid, liquid, gas)

Chemical Change

  • A chemical change is a process that alters the chemical composition of a substance
  • Examples: burning, rusting, cooking, and digestion

Physical Change

  • A physical change is a process that alters the physical properties of a substance, but not its chemical composition
  • Examples: melting, freezing, boiling, and condensation

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