Unit 7 - Chemical Reactions And Energy

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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

    Correct Answer
    A. Rust forming on a car body
    Explanation
    Rust forming on a car body is a chemical reaction because it involves a chemical change. Rust is formed when iron reacts with oxygen in the presence of moisture, resulting in the formation of iron oxide. This process is known as oxidation and is a chemical reaction.

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  • 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

    Correct Answer
    A. Rust
    Explanation
    When iron combines with oxygen and water in the air, it undergoes a chemical reaction to form rust. Rust is the product of this reaction, which means it is the substance that is produced as a result of the reaction.

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  • 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

    Correct Answer
    C. Always equals the mass of the reactants
    Explanation
    In the experiment conducted by Lavoisier, it was observed that the mass of the products formed in a chemical reaction is always equal to the mass of the reactants. This observation is known as the law of conservation of mass, which states that mass is neither created nor destroyed in a chemical reaction. Therefore, the correct answer is that the mass of the products always equals the mass of the reactants.

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  • 4. 

    Which of the following symbols in a chemical equation means "produces"?

    • A.

      +

    • B.

      [p]

    • C.

      (aq)

    • D.
    Correct Answer
    D.
    Explanation
    The symbol "+" in a chemical equation means "produces".

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  • 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

    Correct Answer
    A. Catalyst
    Explanation
    A catalyst is a substance that speeds up a chemical reaction without being permanently changed itself. It works by lowering the activation energy required for the reaction to occur, allowing the reaction to proceed at a faster rate. Catalysts can be used in various industries such as the production of chemicals, pharmaceuticals, and energy. They are essential in increasing the efficiency and reducing the cost of many chemical processes.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 10, 2013
    Quiz Created by
    Haszshe
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