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15 October, 21:43

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns? Select one: A new substance is produced. Coal is made up of more than one element The shape of the coal changes. Oxygen is present.

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Answers (2)
  1. 15 October, 21:47
    0
    A new substance is produced
  2. 15 October, 22:05
    0
    When the coal turns white
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