Unit 7 - Chemical Reactions Test

25 Questions

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Unit 7 - Chemical Reactions Test

In this scientific quiz, we’ll be putting you up against a gauntlet of questions regarding chemical reactions – the process of transformation from one set of chemical substances to another. Think you have the right brain chemistry for the task?


Questions and Answers
  • 1. 
    Substances that prevent certain chemical reactions are called _____.
    • A. 

      Endothermics

    • B. 

      Catalyst

    • C. 

      Inhibitors

    • D. 

      Products

  • 2. 
    When one element replaces another element in a compound, the reaction is a ____ reaction.
    • A. 

      Synthesis

    • B. 

      Single-displacement

    • C. 

      Decomposition

    • D. 

      Double-displacement

  • 3. 
    Each substance to the right of the arrow in a chemical equation is a _____.
    • A. 

      Catalyst

    • B. 

      Precipitate

    • C. 

      Reactant

    • D. 

      Product

  • 4. 
    A chemical reaction in which the energy released is primarily in the form of heat is ____.
    • A. 

      Flammable

    • B. 

      Exothermic

    • C. 

      Endothermic

    • D. 

      Endergonic

  • 5. 
    A substance that speeds up a chemical reaction without undergoing a permanent change itself is a(n) _____.
    • A. 

      Inhibitor

    • B. 

      Coeffient

    • C. 

      Reactant

    • D. 

      Catalyst

  • 6. 
    Numbers that precede symbols and formulas in a chemical equation are called ____.
    • A. 

      Subscripts

    • B. 

      Superscripts

    • C. 

      Fractions

    • D. 

      Coeffients

  • 7. 
    A chemical reaction in which two or more substances combine to form another substance is a _____ reaction.
    • A. 

      Synthesis

    • B. 

      Decomposition

    • C. 

      Reactant

    • D. 

      Product

  • 8. 
    The breaking down of a substance into two or more substances is ______.
    • A. 

      Displacement

    • B. 

      Synthesis

    • C. 

      Decomposition

    • D. 

      Endothermic

  • 9. 
    Each substance on the left side of the arrow in a chemical equation is a ______.
    • A. 

      Reactant

    • B. 

      Product

    • C. 

      Coefficient

    • D. 

      Catalyst

  • 10. 
    If energy in the form of heat is required for a chemical reaction to take place, the reaction is ______.
    • A. 

      Exothermic

    • B. 

      Reactant

    • C. 

      Balanced

    • D. 

      Endothermic

  • 11. 
    Accoriding to the law of conservation of mass, how does the mass of the products in a chemical reaction compare with the mass of the reactants?
    • A. 

      The mass of the products is greater.

    • B. 

      The mass of the reactants is greater.

    • C. 

      There is no relationship.

    • D. 

      The masses are equal.

  • 12. 
    Which of the following could represent a single-displacement reaction?
    • A. 

      Element + element = compound

    • B. 

      Compound = element + element

    • C. 

      Element + compound = element + compound

    • D. 

      Compound + compound = compound + compound

  • 13. 
    A(n) _____ chemical equation has the same number of atoms of each element on both sides of the equation.
    • A. 

      Simple

    • B. 

      Balanced

    • C. 

      Unbalanced

    • D. 

      Complex

  • 14. 
    According to the law of conservation of mass, if two atoms of hydrogen are used as a reactant, how many atoms of hydrogen must be part of the product?
    • A. 

      2

    • B. 

      0

    • C. 

      1

    • D. 

      4

  • 15. 
    What is an insoluble solid that forms as the result of a double-displacement reaction called?
    • A. 

      A precipitate

    • B. 

      An inhibitor

    • C. 

      A coefficient

    • D. 

      A catalyst

  • 16. 
    What information is useful for predicting whether metal will replace another metal in a compound?
    • A. 

      A coefficient

    • B. 

      A subscript

    • C. 

      An activity series

    • D. 

      Atomic mass values

  • 17. 
    An example of a balanced chemical equation is _______.
    • A. 

      AgNO3 + NaCl   4AgCl + 2NaNO3

    • B. 

      2AgNO3 + 2NaCl   3AgCl + 2NaNO3

    • C. 

      AgNO3 + NaCl AgCl + NaNO3

    • D. 

      AgNO3 + 2NaCl + AgCl AgCl + 3NaNO3

  • 18. 
    What type of reaction is shown in the chemical equation NH3 + HCl  NH4Cl?
    • A. 

      Synthesis

    • B. 

      Decomposition

    • C. 

      Single-displacement

    • D. 

      Double-displacement

  • 19. 
    What type of chemical reaction is shown in the equation 2H2O 2H2 + O2?
    • A. 

      Synthesis

    • B. 

      Decomposition

    • C. 

      Single-displacement

    • D. 

      Double-displacement

  • 20. 
    Study the following equation and choose the term that correctly describes the part identified. The big 2 in “2H2O” is a:
    • A. 

      Coefficient

    • B. 

      Reactants

    • C. 

      Products

    • D. 

      Subscript

  • 21. 
    Study the following equation and choose the term that correctly describes the part identified. The left side of the equation:
    • A. 

      Coefficient

    • B. 

      Reactants

    • C. 

      Products

    • D. 

      Subscript

  • 22. 
    Study the following equation and choose the term that correctly describes the part identified. The right side of the equation:
    • A. 

      Coefficient

    • B. 

      Reactants

    • C. 

      Products

    • D. 

      Subscript

  • 23. 
    Study the following equation and choose the term that correctly describes the part identified. The small 2 in “2H2O” is a:
    • A. 

      Coefficient

    • B. 

      Reactants

    • C. 

      Products

    • D. 

      Subscript

  • 24. 
    Balance the following equation:
    • A. 

      3, 1, 3, 1

    • B. 

      3, 3, 2, 3

    • C. 

      3, 2, 3, 1

    • D. 

      1, 2, 1, 2