Chemical Reactions Quiz
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Questions and Answers

What is the indication of a chemical change?

  • Change in the nature and identity of the initial substance (correct)
  • Change in temperature only
  • Change in physical state
  • Change in weight only

    • What is the outcome of burning a magnesium ribbon?

  • Change in color to black
  • Formation of ash (correct)
  • No change observed
  • Release of a foul odor

    • What is the purpose of cleaning the magnesium ribbon with sandpaper?

  • To change the color of the ribbon
  • To prevent the ribbon from burning
  • To remove impurities and ensure better burning (correct)
  • To soften the ribbon for burning

    • What is the significance of collecting the ash formed after burning the magnesium ribbon?

    <p>To analyze the products of the chemical reaction</p> Signup and view all the answers

    How can we determine if a chemical reaction has taken place?

    <p>When a change in the nature and identity of the initial substance occurs</p> Signup and view all the answers

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