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16 February, 12:34

Which of the following is a clue of a chemical change?

A. iron changes color when heated

B. gas bubbles form in boiling water

C. balls of wax form when melted wax is poured into ice water

D. a gas forms when vinegar and baking soda are mixed

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Answers (1)
  1. 16 February, 14:46
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    The answer is D. When you mix the two ingredient it forms another by chemical reaction.
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