Che 1510 Practice Test 2

OCC AH-HL Chemistry

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  1. In a balanced chemical reaction the same number of atoms of each element are present on both sides of the reaction arrow. This practice is an implied statement of the law of:

    2. Your answer:
    gravity.
    conservation of elements.
    conservation of mass.
    conservation of energy.

  2. Respectively, granules of salt and sugar dropped into water and stirred will produce _______________ and _______________ solutions.

    3. Your answer:
    soluble, insoluble
    insoluble, soluble
    electrolyte, nonelectrolyte
    nonelectrolyte, electrolyte

  3. A chemical reaction in which an insoluble solid product is formed when two electrolyte solutions are mixed is classified as:

    4. Your answer:
    a redox reaction.
    a gas-releasing reaction.
    a neutralization reaction.
    a precipitation reaction.

  4. Respectvely, a(an) ________________ is a molecule or polyatomic ion that reacts with water to produce hydronium ions while a(an) ________________ is a molecule or ion that produces hydroxide ions in water.

    5. Your answer:
    acid, base
    base, acid
    acid, nonelectrolyte
    nonelectrolyte, acid

  5. The reaction between an acid and base is called:

    6. Your answer:
    a redox reaction.
    a gas-releasing reaction.
    a neutralization reaction.
    a precipitation reaction.

  6. Respectively, __________________ is the loss of electrons from an atom structure while __________________ is the gain of electrons by an atom structure.

    7. Your answer:
    reduction, oxidation
    oxidation, reduction
    deduction, conduction
    reduction, production

  7. In the reaction: Zn(s) + Cu2+(aq) -> Zn2+(aq) + Cu(s), what is the oxidizing agent? Enter the chemical formula and subscript for your answer.

    8. Your answer:
    Zn(s)
    Cu2+(aq)
    Zn2+(aq)
    Cu(s)

  8. When doing stoichiometic calculatons you must always:

    9. Your answer:
    convert any given moles to mass.
    make calculations based on a balanced equation.
    use Avogadro's number.
    convert any given mass to molarity.

  9. Chemists usually assess the completeness of a chemical reaction by calculating the reaction's:

    10. Your answer:
    actual yield.
    theoretical yield.
    percentage yield.
    annual yield.

  10. The species in a chemical reaction that controls the amount of product generated is called the:

    11. Your answer:
    limiting reactant.
    reactant in excess.
    least productive reactant.
    percentage yield reactant.

  11. What are the coefficients needed to balance the following skeletal equation: KClO3(s) -> KCl(s) + O2(g)? For this and similar questions, enter integers separated by commas.

    12. Your answer:
    1,1,3
    3,2,2
    1,2,2
    2,2,3

  12. What are the coefficients needed to balance the following skeletal equation: H3PO4(aq) + Na2CO3(aq) -> Na3PO4(aq) + CO2(g) + H2O(l) ?

    13. Your answer:
    3,3,2,2,3
    2,3,2,3,3
    3,2,2,3,3
    2,2,3,2,2

  13. What are the coefficients needed to balance the following word equation: hydrochloric acid reacts with aqueous calcium hydroxide to form aqueous calcium chloride and water?

    14. Your answer:
    1,2,1,1
    1,1,1,2
    2,1,1,2
    1,1,1,1

  14. What are the coefficients needed to balance the following word equation: aluminum metal reacts with sulfuric acid to form an aluminum sulfate precipitate plus hydrogen gas?

    15. Your answer:
    3,2,2,1
    2,3,1,3
    3,2,3,1
    1,3,2,2

  15. The net ionic equation for the reaction H2SO4(aq) + 2KOH(aq) -> K2SO4(aq) + 2H2O(l) is H1+(aq) + 2OH1-(aq) -> 2H2O(l). True or false?

    16. Your answer:
    TrueFalse

  16. KCl(aq) + AgNO3(aq) -> AgCl(s) + KNO3(aq) occurs, as determined from a solubility table. True or false?

    17. Your answer:
    TrueFalse

  17. 2NaBr(aq) + Ca(NO3)2(aq) -> CaBr2(s) + 2NaNO3(aq) occurs, as determined from a solubility table. True or false?

    18. Your answer:
    TrueFalse

  18. H3PO4(aq) + 3NaOH(aq) -> Na3PO4(aq) + 3H20(l) is a neutralization reaction. True or false?

    19. Your answer:
    TrueFalse

  19. 3Pb(NO3)2(aq) + 2Na3PO4(aq) -> Pb3(PO4)2(s) + 6NaNO3(aq) is a redox reaction. True or false?

    20. Your answer:
    TrueFalse

  20. Cu(s) + Ag1+(aq) -> Cu2+(aq) + Ag(s) is a precipitation reaction. True or false?

    21. Your answer:
    TrueFalse

  21. Use a periodic table to answer the following question. Given that H3PO4(aq) + 3KOH -> K3PO4(aq) + 3H2O(l), 12 grams of potassium hydroxide is needed to completely react with 0.22 mole of phosphoric acid. True or false?

    22. Your answer:
    TrueFalse

  22. Use a periodic table to answer the following question. Given that Fe2O3(s) + 3C(s) -> 2Fe(l) + 3CO2(g) when heated, 700 kg of iron is produced from 1000 kg of Fe2O3(s). True or false?

    23. Your answer:
    TrueFalse

  23. Use a periodic table to answer the following question. Given that P4(s) + 6Cl2(g) -> 4PCl3(g), a 16.4 gram sample of PCl3 was collected from the reaction of 5.00g of P4 with excess chlorine. The percentage yield of this reaction is 73.9%. True or false.

    24. Your answer:
    TrueFalse

  24. Use a periodic table to answer the following question. Given that CaO(s) + H2O(l) -> Ca(OH)2(s), 47.3 g of Ca(OH)2 is produced from a mixture of 35.5 g of CaO and 11.5 g of H2O. True or false?

    25. Your answer:
    TrueFalse

  25. There is no reason why the actual yield of a chemical reaction would not equal the theoretical yield if all reactants are correctly calculated and precisely weighed. True or false?

    26. Your answer:
    TrueFalse

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