Unit 7 - Chemical Reactions And Energy

5 Questions

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Chemical Reaction Quizzes & Trivia

Chemical reactions are the processes that lead to the transformation of one set of chemical substances to another. Energy is a physical property that must be transferred to an object in order to perform work on or to heat it.


Questions and Answers
  • 1. 
    Which of the following is a chemical reaction?
    • A. 

      Rust forming on a car body

    • B. 

      Water evaporating from salt water leaving salt crystals

    • C. 

      Water freezing into ice

    • D. 

      Dew forming on grass

  • 2. 
    When iron combines with oxygen and water in the air to form rust, what substance in the reaction is the product?
    • A. 

      Rust

    • B. 

      Iron

    • C. 

      Oxygen

    • D. 

      Water

  • 3. 
    As a result of the experiment of Lavoisier, you know that in a chemical reaction the mass of the products ______.
    • A. 

      Is twice as great as the mass of the reactants

    • B. 

      Is less than the mass of the reactants

    • C. 

      Always equals the mass of the reactants

    • D. 

      Cannot be predicted based on the mass of the reactants

  • 4. 
    Which of the following symbols in a chemical equation means "produces"?
    • A. 

      +

    • B. 

      [p]

    • C. 

      (aq)

    • D. 
  • 5. 
    A(n) ______ is a substance that speeds up a chemical reaction without being permanently changed itself.
    • A. 

      Catalyst

    • B. 

      Inhibitor

    • C. 

      Exotherm

    • D. 

      Endotherm