Q:

A certain pure substance, A, when heated is changed into two quite different pure substances, C and D. Which of the following statements must be true?

0

A certain pure substance, A, when heated is changed into two quite different

pure substances, C and D. Which of the following statements must be true?


  1. A is a compound.
  2. C and D are not elements.
  3. A, C and D are all compounds.
  4. C and D are elements.

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A: only this choice must be true. The others are just possible.

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