Unit 3 Quiz--Limiting Reactants--Thurston High Chemistry

Multiple Choice (Choose the best answer.)

  1. Pretend you have a job building tricycles. If you had 100 handle bars, 150 wheels, 250 pedals, and 75 seats, how many tricycles could you build?

    50

    75

    120

    125

    None of these are correct.

  2. In problem 1, what is the limiting reactant?

    handle bars

    wheels

    pedals

    seats

    None of these are correct.

  3. In problem 1, how many pedals are left over after you have built the tricycles?

    0

    100

    150

    200

    None of these are correct.

  4. Hydrogen and nitrogen react to form ammonia according to the reaction, 3 H2 + N2 2 NH3. If 4.0 moles of H2 with 2.0 mol of N2 are reacted, how do you know this is a limiting reactant problem?

    Mass is conserved in the problem.

    Moles are not conserved in the problem.

    The mass of two reactants are given.

    More than one of the above are correct.

    None of the above are correct.

  5. In problem 3, how many moles of NH3 would be produced?

    0.38 moles

    2.0 moles

    2.7 mol

    4.0 mol

    None of these are correct.

  6. What reactant is the limiting reactant in problem 3?

    H2

    N2

    NH3

    None of these is the limiting reactant.

    More than one is the limiting reactant.

  7. How many moles of what reactant is left over?

    0.7 mol of N2

    1.3 mol of N2

    2 mol H2

    6 mol H2

    2.7 mol NH3

  8. In the reaction, Zn + 2 HCl ZnCl2 + H2, 25.0 grams of Zn are reacted with 17.5 g of HCl. How many grams of H2 will be produced?

    0.382 g of H2

    0.479 g H2

    0.765 g H2

    25.0 g H2

    None of these are correct.

  9. In problem 8, which substance is the limiting reactant?

    Zn

    HCl

    ZnCl2

    H2

    None of these are correct.

  10. How many grams of what substance is left over?

    0.285 g of HCl

    7.5 g of Zn

    15.7 g Zn

    9.3 g Zn

    None of these are correct.

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