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Science, Chemistry

10th

grade

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Chemical Equations and Reactions

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15 questions

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  • 1. Multiple Choice
    45 seconds
    1 pt

    Which of the following is true regarding the law of conservation of mass?

    It dictates that the number of molecules on each side of a chemical equation must be the same.

    It dictates that the number of atoms of each element must be the same on both sides of a chemical equation.

    It states that the mass of the reactants must remain constant in order for a chemical reaction to proceed.

    It does not apply to chemical reactions.

  • 2. Multiple Choice
    45 seconds
    1 pt

    Which of the following may indicate that a chemical reaction has occured?

    release of energy as light

    a color change

    gas bubble formation

    all of these

  • 3. Multiple Choice
    45 seconds
    1 pt

    Which of the following is a product in the reaction described by the word equation: iron + copper(II) sulfate --> iron(II) sulfate + copper

    iron(II) sulfate

    copper

    iron

    two of these are correct

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