A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?
A Heat is added to the sugar crystals.
B The sugar melts and becomes a liquid.
C The temperature of the sugar increases.
D Gas is produced as the sugar turns black.



My answer to that is letter B. The chemical reaction is the transformation of solid to liquid form that is illustrated in the given question.
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