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30 May, 17:41

Which of the following examples is a sign

that a chemical change is occurring?

A. the substance seems to have disappeared

B. the state of the matter has changed

C. the production of heat, light, and smoke

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Answers (2)
  1. 30 May, 18:06
    0
    The answer is C. Heat is an indicator that energy is being released, which occurs during a chemical change. Light and smoke can also be factors
  2. 30 May, 18:29
    0
    Answer: C. The production of heat, light and smoke

    Explanation: In a chemical reaction taking place several evidence are the presence of light emission and heat is generated in the reaction. Smoke is also an indication when a chemical reaction is happening such as combustion reaction.
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