Chapter 7- Chemical Reactions

21 Questions | Total Attempts: 317

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Chapter 7- Chemical Reactions

Students will be assessed on their understanding of chemical reactions, chemical and physical changes, writing chemical formulas and balancing chemical equations.


Questions and Answers
  • 1. 
    The process in which one or more substances change to make one or more new substances is called?
    • A. 

      Chemical change

    • B. 

      Chemical reaction

    • C. 

      Chemical process

    • D. 

      Chemical explosion

  • 2. 
    How can you tell when a chemical reaction is taking place? (check all that apply)
    • A. 

      A gas forms

    • B. 

      Substance turns to a liquid

    • C. 

      Energy is given off

    • D. 

      There is a color change

  • 3. 
    Angela has been given an unknown substance. She has been asked to determine if this substance will react chemically with water. Which of the following best illustrates that a chemical change has happened?
    • A. 

      When added to the water, the substance settled to the bottom of the beaker.

    • B. 

      The substance dissolved in the water. When the water evaporated, the unknown substance remained.

    • C. 

      The substance floated on the surface of the water.

    • D. 

      When mixed with water, bubbles and heat were generated.

  • 4. 
    Why is charcoal burning in a grill an example of a chemical change?
    • A. 

      New atoms are created.

    • B. 

      New substances are produced.

    • C. 

      Chemical bonds are not broken.

    • D. 

      Charcoal changes from a solid to a gas.

  • 5. 
    What evidence in the photo supports the claim that a chemical reaction is taking place?
    • A. 

      Color change

    • B. 

      Liquid is boiling

    • C. 

      Gas produced

    • D. 

      Precipitate

  • 6. 
    A ______________________ is a shorthand way to use chemical symbols and numbers to represent a substance.
  • 7. 
    The starting materials in a chemical reaction are called the ______________________.
  • 8. 
    A _____________________________________ uses symbols and formulas as a shortcut to describe a chemical reaction.
  • 9. 
    The ____________________________ are the substances that are formed after a chemical reaction takes place.
  • 10. 
    The __________________________________________ says that mass cannot be created or destroyed.
  • 11. 
    Mowing the lawn
    • A. 

      Chemical change

    • B. 

      Physical change

  • 12. 
    burning match
    • A. 

      Chemical change

    • B. 

      Physical change

  • 13. 
    rusting bicycle chain
    • A. 

      Chemical change

    • B. 

      Physical change

  • 14. 
    making ice cream
    • A. 

      Chemical change

    • B. 

      Physical change

  • 15. 
    Ice cube melting
    • A. 

      Chemical change

    • B. 

      Physical change

  • 16. 
    Write the chemical formula for dinitrogen monoxide.
  • 17. 
    Is the chemical equation balanced?                            Na        +       Cl2   ------------------->    NaCl
    • A. 

      Yes

    • B. 

      No

  • 18. 
    Is the chemical equation balanced?                    3Mg      +     N2 ------------->   Mg3N2
    • A. 

      Yes

    • B. 

      No

  • 19. 
    Write the chemical formula for dinitrogen tetroxide.
  • 20. 
    Write the chemical formula for carbon monoxide.
  • 21. 
    Write the chemical formula for trisulfur hexachloride.