Chemical Reactions and Equations Quiz for 10th Graders
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Questions and Answers

Which of the following statements is true about chemical reactions?

  • They only occur in the presence of heat
  • They always result in the formation of a gas
  • They can only happen in a laboratory setting
  • They involve the formation or breaking of chemical bonds (correct)

    • What is the purpose of balancing a chemical equation?

  • To make the equation look more symmetrical
  • To ensure that the equation obeys the law of conservation of mass (correct)
  • To indicate the stoichiometric coefficients of the reactants and products
  • To make the equation easier to understand

    • Which of the following is an example of a chemical reaction?

  • Dissolving salt in water
  • Boiling water
  • Melting ice
  • Burning wood (correct)

    • Which of the following is true about chemical reactions?

    <p>Chemical reactions involve the breaking and formation of chemical bonds.</p> Signup and view all the answers

    Which of the following is an example of a chemical reaction?

    <p>Burning of wood</p> Signup and view all the answers

    What is the purpose of balancing a chemical equation?

    <p>To ensure that the number of atoms is conserved in the reaction</p> Signup and view all the answers

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