Che 1000 Practice Test 4

OCC AH Chemistry

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  1. The energy needed to initiate a chemical reaction is known as the:

    2. Your answer:
    kinetic energy.
    activation energy.
    potential energy.
    transmission energy.

  2. A reaction that absorbs heat is known as ______________ while a reaction that liberates heat is known as ____________

    3. Your answer:
    exothermic, endothermic
    endothermic, exothermic
    endothermic, pyrothermic
    cryothermic, pyrothermic

  3. Which one of the following cannot be used as evidence of a double-displacement reaction?

    4. Your answer:
    evolution of heat
    production of gas bubbles
    production of noticeable odor
    formation of an insoluble precipitate

  4. Pick the correct reactants and products of photosynthetic reactions.

    5. Your answer:
    Reactants: C02, H20, light energy; Products: C6H1206, H20
    Reactants: C6H1206, light energy, C02; Products: C02, 02
    Reactants: C02, H20, light energy; Products: C6H1206, 02
    Reactants: C02, 02, light energy; Products: C6H1206, H20

  5. Which one of the following is not considered a significant greenhouse gas?

    6. Your answer:
    CO2
    NH3
    H2O
    CH4

  6. Per year, what is likely the source that contributes the least amount of C02 to the atmosphere?

    7. Your answer:
    volcanic eruptions
    burning of fossil fuels
    C02 released from carbonated beverages
    slash-and-burn agricultural field preparation

  7. C02(g) + H20(l) --> H2C03(aq) is a combination reaction. True or false?

    8. Your answer:
    TrueFalse

  8. ZnCI2(aq) + KOH(aq)-> Zn(OH)2(s) + 2KCI(aq) is a combination reaction. True or false?

    9. Your answer:
    TrueFalse

  9. 2AlI3(aq) + 3Cl2(g) --> 2AlCl3(aq) + 3I2(g) is a decomposition reaction. True or false?

    10. Your answer:
    TrueFalse

  10. 2Pb02(s) --> 2PbO(s) + 02(g) is a decomposition reaction. True or false?

    11. Your answer:
    TrueFalse

  11. (NH4)2S(aq) + 2HCl(aq) --> H2S(g) + 2NH4Cl(aq) is a double displacement reaction. True or false?

    12. Your answer:
    TrueFalse

  12. Examine the following metal activity list: K>Na>Mg>Al>Zn>Fe>Pb>H>Cu>Ag>Hg>Au. Does K(s) + AgNO3(aq) --> Ag(s) + KNO3(aq)actually take place?

    13. Your answer:
    TrueFalse

  13. Examine the following metal activity list: K>Na>Mg>Al>Zn>Fe>Pb>H>Cu>Ag>Hg>Au. Does 2Al + 3H2O(l) --> Al2O3(s) + 3H2O(g)occur?

    14. Your answer:
    TrueFalse

  14. Examine the following metal activity list: K>Na>Mg>Al>Zn>Fe>Pb>H>Cu>Ag>Hg>Au. Does 2Ag(s) + 2HCl(l) --> 2AgCl(s) + H2(g)take place?

    15. Your answer:
    TrueFalse

  15. Examine the following metal activity list: K>Na>Mg>Al>Zn>Fe>Pb>H>Cu>Ag>Hg>Au. Does Hg(s) + CuSO4(aq) --> HgSO4(aq) + Cu(s)occur?

    16. Your answer:
    TrueFalse

  16. Examine the following metal activity list: K>Na>Mg>Al>Zn>Fe>Pb>H>Cu>Ag>Hg>Au. Does Fe(s) + H2SO4(aq) --> FeSO4(aq) + H2(g)take place?

    17. Your answer:
    TrueFalse

  17. Write the coefficients (separated by commas) needed to balance H3P04(aq) + MgCO3(aq) --> Mg3 (P04)2(s) + C02(g) + H20(l). For example 6,2,3,1,5

    18. Your answer:

  18. If 20.0 g of carbon dioxide is produced, calculate the number of moles of magnesium carbonate used. You must use a Periodic Table of the Elements. Round your answer to 0.01 mol.

    19. Your answer:

  19. If 50.0 g of magnesium carbonate react completely with H3P04, calculate the number of grams of carbon dioxide produced. You must use a Periodic Table of the Elements. Round your answer to 0.1 g.

    20. Your answer:

  20. How many moles of MgCO3 are needed to react to produce 6.0 moles of Mg (P04)2? You must use a Periodic Table of the Elements. Round your answer to the nearest whole mole.

    21. Your answer:

  21. For the reaction CS2(l) + 3O2(g) --> 2SO2(g) + CO2(g) how many grams of SO2 will result when 152g of CS2 and 64g of O2 are combined? You must use a Periodic Table of the Elements. Round your answer to the nearest whole gram.

    22. Your answer:

  22. For the reaction CS2(s) + 3O2(g) --> 2SO2(g) which substance is the limiting reactant? Enter the correct formula.

    23. Your answer:

  23. For the reaction CS2(s) + 3O2(g) --> 2SO2(g) by how much is the other reactant in excess? Round your answer to the nearest whole gram.

    24. Your answer:

  24. C2H4 gas is combusted in the presence of 02. If C02 is one of the products, write the coefficients (separated by commas) needed to balance this equation. For example 6,2,3,1

    25. Your answer:

  25. How many grams of C02 can be produced by the reaction of 2.0 g C2H4 and 5.0 g 02? You must use a Periodic Table of the Elements. Round your answer to the nearest 0.1 gram.

    26. Your answer:

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