Chemical Reactions and Equations Quiz
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Questions and Answers

How is a chemical reaction recognized?

  • By observing change in state, color, or evolution of gas (correct)
  • By measuring the pH level
  • By analyzing crystal structure
  • By observing change in weight

    • What is a chemical equation used to represent?

  • Biological reactions
  • Nuclear reactions
  • Chemical reactions (correct)
  • Physical changes

    • Why do we balance a chemical equation?

  • To increase the rate of the reaction
  • To make the equation look more complex
  • To ensure the number of atoms of each element remains the same (correct)
  • To change the nature of the reaction

    • What is used to represent a gaseous substance in a chemical equation?

    <p>(g)</p> Signup and view all the answers

    What type of reaction is represented by the formation of Ca(OH)2 from CaO and H2O?

    <p>Combination reaction</p> Signup and view all the answers

    What is used to represent a gaseous substance in a chemical equation?

    <p>(g)</p> Signup and view all the answers

    What is the purpose of balancing a chemical equation?

    <p>To ensure the conservation of mass and atoms</p> Signup and view all the answers

    What does the chemical equation 3 Fe(s) + 4H2O(g) $\rightarrow$ Fe2O3(s) + 4H2(g) represent?

    <p>Balanced chemical equation</p> Signup and view all the answers

    Which type of reaction is represented by the formation of Ca(OH)2 from CaO and H2O?

    <p>Combination reaction</p> Signup and view all the answers

    How can a chemical reaction be recognized?

    <p>By observing change in state, color, evolution of gas, or change in temperature</p> Signup and view all the answers

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