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ARC-Challenge / NCEOGA_2013_8_42 / Which shows one example of a physical change and one example of a chemical…

Problem

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question

Which shows one example of a physical change and one example of a chemical change?

choices

  • boiling water and melting wax
  • rusting iron and baking a cake
  • dissolving powder and shredding paper
  • freezing water and burning coal

Discussion

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Source and history

Official source

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