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Chemical Reactions Pre-assessment

14 Questions
Chemical Quizzes & Trivia
Questions and Answers
  • 1. 
    Chemical reactions
    • A. 

      Occur only in living organisms.

    • B. 

      Create and destroy atoms.

    • C. 

      Only occur outside living organisms.

    • D. 

      Produce new substances.

  • 2. 
    A net ionic equation
    • A. 

      Shows the spectator ions.

    • B. 

      Shows only those particles involved in the reaction.

    • C. 

      Is not necessarily balanced with respect to mass or charge.

    • D. 

      Shows dissolved ionic compounds as dissociated free ions.

  • 3. 
    What does the  triangle symbol  above the arrow in a chemical equation mean?
    • A. 

      Heat is supplied to the reaction.

    • B. 

      A catalyst is needed in the reaction.

    • C. 

      Electricity is need in the reaction.

    • D. 

      A precipitate will form during the reaction.

  • 4. 
                         Which of the following combinations of symbol and explanation of symbol is correct when used in a chemical equation?
    • A. 

      (g), grams

    • B. 

      (l), liters

    • C. 

      (aq), dissolved in water

    • D. 

      (s), solid product

  • 5. 
    In the chemical equation    H<sub>2</sub>O<sub>2</sub>  à  H<sub>2</sub>O   +  O<sub>2</sub>f       the  O<sub>2</sub>  is a ____.
    • A. 

      Catalyst

    • B. 

      Solid

    • C. 

      Product

    • D. 

      Reactant

  • 6. 
    Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?
    • A. 

      P (s) + O2(g) -->P O2 (g)

    • B. 

      P(s) + O2(g) --> P5 O2 (g)

    • C. 

      P(s) + O2(g) -->P2 O5 (s)

    • D. 

      P2 O5 (s) --> P2 (s) + O2 (g)

  • 7. 
    When the equation    Fe  +  Cl2   à FeCl3 is balanced, what is the coefficient for Cl ?
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 8. 
    When the following equation is balanced, what is the coefficient for HCl? Mg(s)  +  HCl (aq) à   MgCl2 (aq) + H2 (g)
    • A. 

      6

    • B. 

      3

    • C. 

      1

    • D. 

      2

  • 9. 
    Which of the following statements is true about what happens in all chemical reactions?
    • A. 

      The ways in which atoms are joined together is not changed.

    • B. 

      New atoms are formed as products.

    • C. 

      The final substances are called reactants.

    • D. 

      Bonds between atoms are broken and new bonds are formed.

  • 10. 
                        When the equation   KClO3 (s)  à  KCl (s) +  O2 (g)  is balanced, the coefficient of KClO3 is
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 11. 
                         In a combustion reaction, one of the reactants is
    • A. 

      Hydrogen

    • B. 

      Nitrogen

    • C. 

      Oxygen

    • D. 

      Metal

  • 12. 
                    The reaction 2Fe  + 3Cl2   --> 2FeCl3 is an example of which type of reaction?
    • A. 

      Combustion reaction

    • B. 

      Single-replacement reaction

    • C. 

      Combination reaction

    • D. 

      Decomposition reaction

  • 13. 
    The equation Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g) is an example of which type of reaction?
    • A. 

      Combination reaction

    • B. 

      Single-replacement reaction

    • C. 

      Decomposition reaction

    • D. 

      Double-replacement reaction

  • 14. 
    The equation H3PO4 + 3KOH  --> K3PO3 + 3H2O is an example of which type of reaction?
    • A. 

      Double-replacement reaction

    • B. 

      Combination reaction

    • C. 

      Decomposition reaction

    • D. 

      Single-replacement reaction

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