Chemical Reactions and Equations Chapter 1 Quiz
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Questions and Answers

What is one of the examples given in the text where a chemical change occurs?

  • Leaving milk at room temperature during summers
  • Burning magnesium ribbon (correct)
  • Respiring
  • Cooking food

    • What is the nature of the initial substance when a chemical change occurs?

  • It completely changes
  • It partially changes (correct)
  • It becomes unrecognizable
  • It remains the same

    • What is the purpose of burning magnesium ribbon in the activity described in the text?

  • To create ash for another experiment
  • To produce heat
  • To measure the energy produced
  • To observe a chemical change (correct)

    • Which statement best describes the difference between physical and chemical changes?

    <p>Physical changes involve a change in chemical composition, while chemical changes do not.</p> Signup and view all the answers

    How does the text suggest recognizing when a chemical reaction has taken place?

    <p>By observing a change in color or odor</p> Signup and view all the answers

    What would be an example of a physical change based on the given text?

    <p>Melting ice</p> Signup and view all the answers

    What is the chemical name of the white powder formed when magnesium ribbon burns in air?

    <p>Magnesium oxide</p> Signup and view all the answers

    Which of the following observations helps to determine whether a chemical reaction has taken place?

    <p>Change in state</p> Signup and view all the answers

    In a word-equation, where are the reactants written?

    <p>On the left-hand side with a plus sign between them</p> Signup and view all the answers

    What is the chemical equation for the reaction between magnesium and oxygen?

    <p>Mg + O → MgO</p> Signup and view all the answers

    What can make chemical equations more concise and useful?

    <p>Using chemical formulae instead of words</p> Signup and view all the answers

    What substance is formed when lead nitrate solution is mixed with potassium iodide solution?

    <p>Lead iodide</p> Signup and view all the answers

    What is formed by the action of dilute sulphuric acid on zinc?

    <p>Hydrogen gas</p> Signup and view all the answers

    Which of the following is NOT an observation that helps determine whether a chemical reaction has taken place?

    <p>$5(7 + 3)$</p> Signup and view all the answers

    $2 \times 3$

    <p>$6$</p> Signup and view all the answers

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