Grade 8 Ch 5 L 2: Types Of Chemical Reactions

14 Questions | Total Attempts: 1121

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Grade 8 Ch 5 L 2: Types Of Chemical Reactions

Questions and Answers
  • 1. 
    Which is the BEST indication that a chemical reaction has taken place?
    • A. 

      Blue powder turns water blue

    • B. 

      A white substance dissolving in water

    • C. 

      Metal bubbling when placed in an unknown liquid

  • 2. 
    What is an example of a synthesis reaction?
    • A. 

      CO2 breaking down to C + O2

    • B. 

      Zn + 2HCl -> ZnCl2 + H2

    • C. 

      Hydrogen and Oxygen combining to form water (2H2 + O2 -> 2H2O)

  • 3. 
    What kind of a reaction is this?  Please give an example.
    • A. 

      Double Replacement: NaCl + AgNO3 -> NaNO3 + AgCl

    • B. 

      Synthesis: C + O2 -> CO2

    • C. 

      Decomposition: 2H2O -> 2H2 + O2

  • 4. 
    What are the the products in the following reaction: CH4 + 2O2 -> CO2 + 2H20
    • A. 

      Carbon Dioxide and Water

    • B. 

      Carbon Monoxide and Hydroxide

    • C. 

      Salt and Vinegar

  • 5. 
    What kind of reaction is this?
    • A. 

      Single Replacement

    • B. 

      Double Replacement

    • C. 

      Synthesis

  • 6. 
    What is the following chemical reaction? Zn + 2HCl -> ZnCl2 + H2?
    • A. 

      Combustion

    • B. 

      Single Replacement

    • C. 

      Synthesis

  • 7. 
    Balance the equation: _H2 + _O2 -> _H2O
    • A. 

      3H2 + 5O2 -> H2O

    • B. 

      2H2 + _O2 -> 2H2O

  • 8. 
    Give an example of and draw a synthesis reaction
    • A. 

      NaCl + AgNO3 -> NaNO3 +AgCl

    • B. 

      CO2 -> C + O2

    • C. 

      Mg + 2OH -> Mg(OH)2

  • 9. 
    What kind of reaction occurs when the negative ions in 2 compounds switch?
    • A. 

      Decomposition

    • B. 

      Double-replacement

    • C. 

      Synthesis

  • 10. 
    What kind of reaction occurs when one element replaces another?
    • A. 

      Synthesis

    • B. 

      Combustion

    • C. 

      Single Replacement

  • 11. 
    What kind of reaction occurs when a compound breaks down?
    • A. 

      Decomposition

    • B. 

      Synthesis

    • C. 

      Combustion

  • 12. 
    What kind of reaction is opposite of decomposition?
    • A. 

      Single Replacement

    • B. 

      Decomposition

    • C. 

      Synthesis

  • 13. 
    What kind of reaction has only ONE reactant?
    • A. 

      Single Replacement

    • B. 

      Decomposition

    • C. 

      Synthesis

  • 14. 
    Which one is an example of combustion?
    • A. 

      Burning wood

    • B. 

      Making Salt

    • C. 

      Making salt water taffy