Unit 2 Balancing and Identifying Reactions Quiz -- Thurston High Chemistry

Multiple Choice (Choose the best answer.)

  1. Which of the following shows a correct way to balance the chemical equation:

    Fe + O2 Fe2O3

    4 Fe + 3 O2 2 Fe2O3

    2 Fe + 3 O2 Fe2O6

    4 Fe + O6 2 Fe2O3

    2 Fe + 3/2 O2 Fe2O3

    More than one of the above are possible.

  2. Which is the incorrect way to interpret the balanced reaction below:

    2 KBrO3 2 KBr + 3 O2

    The reactants and products contain 2 atoms of K, 2 atoms of Br, and 6 atoms of O.

    The reactants and products both contain 334 g.

    2 molecules of 2 KBrO3 produce 2 molecules of 2 KBr and 3 molecules of O2.

    2 moles of 2 KBrO3 produce 2 moles of 2 KBr and 3 moles of O2.

    All of the above are correct.

  3. The reaction shown in problem 1 can be thought of as a:

    decomposition

    combination

    combustion

    decomposition and combustion

    combination and combustion

  4. The reaction shown in problem 2 can be thought of a

    combination

    decomposition

    single replacement

    double replacement

    combustion

  5. If the reaction shown below is a single replacement, what will the reaction be when it is balanced?

    Ba + HCl ?

    Ba + 2 HCl BaH2 + Cl2

    Ba + HCl BaHCl

    Ba + 2 HCl H2 + BaCl2

    Ba + 2 HCl 2 H + BaCl2

    2 Ba + 2 HCl H2 + 2 BaCl

  6. If the reaction below is a double replacement, what will the reaction be when it is balanced?

    AlCl3 + AgNO3 ?

    AlCl3 + AgNO3 AlAg + Cl3NO3

    AlCl3 + AgNO3 AlNO3 + AgCl3

    AlCl3 + AgNO3 Al(NO3)3 + 3 AgCl

    AlCl3 + 3 AgNO3 Al(NO3)3 + 3 AgCl

    None of the above are correct.

  7. When a hydrocarbon undergoes complete combustion the products are:

    carbon dioxide and water

    carbon dioxide and hydrogen

    carbon dioxide and oxygen

    carbon and hydrogen

    carbon and oxygen

  8. Which of the following is true in a balanced chemical reaction?

    Atoms are conserved.

    Mass is conserved.

    Molecules are conserved.

    A and B are both correct.

    B and C are both correct.

  9. What will be the balanced product(s) of the following reaction?

    CH4 + 2 O2 ?

    CH4O4

    CO2 + 2 H2O

    C + H4O4

    C + H2 + O2

    C + 2 H2 + 2 O2

  10. Which of the following symbols is not a correct indication of the phase of a substance in a reaction?

    (s) = solid

    (g) = grams

    (aq) = aqueous or dissolved in water

    (l) = liquid

    All of the above are correct.

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