CHM 1040: Final 4/4

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kieu
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82732
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CHM 1040: Final 4/4
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2011-04-30 00:45:53
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CHM Final
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CHM 1040: Final 4/4
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  1. Suppose you are building bird houses. The bird houses require
    ten nails and four pieces of wood each. Which of the following is not an
    exact relationship (ratio) between the number of nails and the number
    of pieces of wood you would need to build more than one birdhouse?

    A) 40 nails, 16 pieces of wood
    B) 4 boxes of nails, 100 pieces of wood
    C) 70 nails, 28 pieces of wood
    D) 10 dozen nails, 4 dozen pieces of wood
    B) 4 boxes of nails, 100 pieces of wood

    
    (this multiple choice question has been scrambled)
  2. Consider the generic reaction A + B —? C. This is an example of a

    A) oxidation-reduction.
    B) precipitation.
    C) displacement.
    D) synthesis.
    D) synthesis.
    (this multiple choice question has been scrambled)
  3. In an acid-base reaction, a weak acid would not form as much water as the same amount of strong acid.

    A) True
    B) False
    B) False
  4. Calculate the number of atoms in 42.6 amu of nitrogen.

    A) 1.4 x 1022
    B)
    C)
    D)
    E) 1, exactly
    D)
    (this multiple choice question has been scrambled)
  5. What is a decomposition reaction?

    A) One reactant yielding product(s)
    B) Any reaction that breaks down reactants.
    C) A reaction that is explosive.
    D) A reaction that produces an odor.
    A) One reactant yielding product(s)
    (this multiple choice question has been scrambled)
  6. If you wanted to create laboratory workbooks and you had 15
    front covers, 21 back covers and 64 blank sheets of paper, how many
    workbooks could you assemble if 1 workbook = 1 front cover + 5 blank
    sheets + 1 back cover?

    A) 12
    B) 15
    C) 13
    D) 21
    E) 5
    A) 12
    (this multiple choice question has been scrambled)
  7. How many grams of iron (III) chloride may be formed when 43g of iron and 160g of Cl2 are reacted? 2Fe(s) + 3Cl2(s)-> 2FeCl3

    A) 125g
    B) 249g
    C) 107g
    D) 162g
    A) 125g
    (this multiple choice question has been scrambled)
  8. It is possible for only an oxidation to occur in a reaction.

    A) True
    B) False
    B) False

    Oxidation must occur with reduction.
  9. Which of the following reactions could be classified as a double-displacement reaction?

    A) Pb(NO3)2 (aq) + H2S (aq) --? 2HNO3 (aq) + PbS (s) (OK)
    B) Zn (s) + 2 HCl (aq) --? H2 (g) + ZnCl2 (aq)
    C) 2H2O2 --? 2H2O + O2
    D) 2C (s) + O2 (g) --? 2CO (g)
    A) Pb(NO3)2 (aq) + H2S (aq) --? 2HNO3 (aq) + PbS (s) (OK)

    
    (this multiple choice question has been scrambled)
  10. How many grams of hydrogen are required to form 180 grams of water?2H2 + O2 -> 2H2O

    A) 20
    B) 40
    C) 18
    D) 36
    A) 20
    (this multiple choice question has been scrambled)
  11. Calculate the mass, in grams, of 1.51 mol of carbon tetrachloride, CCl4.

    A) 4.31 x 10-3
    B) 232.25
    C) 6.50 x 10-3
    D) 153.8
    E) 189.84
    B) 232.25
    (this multiple choice question has been scrambled)
  12. It is not important to balance a chemical equation in order to see the number relationships.

    A) True
    B) False
    B) False

    In order to know how much of each substance reacts, it is very important to balance the equation.
  13. n an oxidation-reduction reaction,

    A) the non-metal loses electrons, and the metal gains electrons.
    B) heat is always generated.
    C) both the metal and the non-metal gain electrons.
    D) water is formed.
    E) metals lose electrons.
    E) metals lose electrons.
    (this multiple choice question has been scrambled)
  14. In the reaction: 2Fe(s) + 3Cl2(g) ->2FeCl3(s) (same as question 8), if 43 grams of iron were reacted, how many grams of Cl2 would be needed?

    A) 82
    B) 590
    C) 250
    D) 41
    A) 82
    (this multiple choice question has been scrambled)
  15. If 65g of iron react with 170g of Cl2, and the actual yield of FeCl3(s) was 43g, what would the percentage yield be? 2Fe(s) + 3Cl2(g) ->2FeCl3(s)

    A) 45
    B) 11
    C) 23
    D) 90
    C) 23
    (this multiple choice question has been scrambled)
  16. A compound containing magnesium and oxygen contains 43.2% Mg by mass. What is a possible formula for the compound?

    A) Mg2O2
    B) MgO2
    C) MgO
    D) Mg20
    B) MgO2
    (this multiple choice question has been scrambled)
  17. What mass of oxygen contains the same number of atoms as 32.0 g of sulfur?

    A) 16.0 g
    B) 8.0 g
    C) 4.0 g
    D) 32.0 g
    E) 64.0 g
    A) 16.0 g
    (this multiple choice question has been scrambled)
  18. What evidence is there that ions separate in solution?

    A) Solids appear in solution.
    B) A color change occurs.
    C) Heat is generated.
    D) An explosion occurs.
    E) Charge may be carried by such a solution.
    E) Charge may be carried by such a solution.
    (this multiple choice question has been scrambled)
  19. A gross is a dozen dozen, or 144 items. Suppose you have 14
    1/2 gross of ping-pong balls in your warehouse. How many ping-pong balls
    is this?

    A) 144
    B) 20880
    C) 2088
    D) 216
    E) 174
    C) 2088
    (this multiple choice question has been scrambled)
  20. On the basis of the general solubility rules, which of the following compounds should be insoluble in water?

    A) KNO3
    B) NaS
    C) Fe(NO3)2
    D) FeS
    E) NaNO3
    D) FeS
    (this multiple choice question has been scrambled)
  21. What is the mass of nitrogen atoms in amu's? 1.2 x 10-24

    A)
    B)
    C)
    D)
    E)
    D)
    (this multiple choice question has been scrambled)
  22. Which of the following statements is false?

    A) The limiting reactant determines the amount of product formed.
    B) There may not be more than one limiting reactant.
    C) The limiting reactant is completely consumed in a reaction.
    D) If a reactant is left over after a reaction, it was the limiting reactant.
    D) If a reactant is left over after a reaction, it was the limiting reactant.
    (this multiple choice question has been scrambled)
  23. Which of the following is not one of the four "driving forces" that pull reactants to form products during chemical reactions?

    A) Formation of a product.
    B) Electron transfer
    C) Gas evolution
    D) Solid formation
    E) Water formation
    A) Formation of a product.
    (this multiple choice question has been scrambled)
  24. In one word, why do we use average atomic masses for the elements?

    A) history
    B) errors
    C) variation
    D) isotopes
    D) isotopes
    (this multiple choice question has been scrambled)
  25. On the basis of the solubility rules, which of the following should be soluble in water?

    A) KOH
    B) PbCO3
    C) Fe(OH)2
    D) PbS
    E) Ba(OH)2
    A) KOH
    (this multiple choice question has been scrambled)
  26. If 1000 HCl units and 1000 HCN units were dissolved in water,
    the relative amounts of species in solution would be shown as _____(HCN
    is a weak acid):

    A)
    B)
    C)
    D)
    E)
    A)
    (this multiple choice question has been scrambled)
  27. A store has oranges which are, on average, 2.3 oranges per
    pound. If navel oranges cost $0.79/lb, how many oranges (to the nearest
    whole orange, of course) will $5.00 buy?

    A) 7
    B) 21
    C) 4
    D) 15
    E) 6
    D) 15
    (this multiple choice question has been scrambled)
  28. If 65g of iron react with 170g of Cl2, how many grams of FeCl3(s) product could be formed? 2Fe(s) + 3Cl2(g) ->2FeCl3(s)

    A) 127
    B) 95
    C) 190
    D) 282
    C) 190
    (this multiple choice question has been scrambled)
  29. What is the net charge of a precipitate formed by two aqueous solutions?

    A) +1, because water is negative.
    B) -1, because water is positive.
    C) Neutral, because an insoluble salt compound is formed.
    D) It depends upon the situation.
    C) Neutral, because an insoluble salt compound is formed.
    (this multiple choice question has been scrambled)
  30. Which two compounds have the same empirical formula?

    A) C2H5OH and C6H18O3
    B) C12H10O and C6H3OH
    C) CH2O and C6H12O
    D) C5H12 and C10H22
    E) Mg(OH)2 and Ca(OH)2
    A) C2H5OH and C6H18O3
    (this multiple choice question has been scrambled)
  31. Which of the following reactions could be classified as an oxidation-reduction reaction?

    A) H+ + OH- --? H2O
    B) Zn (s) + 2 HCl (aq) --? H2 (g) + ZnCl2 (aq)
    C) Pb(NO3)2 (aq) + H2S (aq) --? 2HNO3 (aq) + PbS (s)
    D) FeSO4 (aq) + CuCl2 (aq) --? FeCl2 (aq) + Cu(SO4)2 (aq)
    B) Zn (s) + 2 HCl (aq) --? H2 (g) + ZnCl2 (aq)
    (this multiple choice question has been scrambled)
  32. How many moles of K2CO3 would be formed by the complete reaction of 0.75 moles of KO2 in the reaction: 4KO2(s) + 2CO2(g) -> 2K2CO3(s) +3O2?

    A) 2.0
    B) 1.5
    C) 0.75
    D) 0.5
    E) 3.0
    B) 1.5
    (this multiple choice question has been scrambled)
  33. From the number of grams of a single product formed in a balanced chemical reaction, you may determine

    A) How many total grams of all reactants were used up.
    B) Only how many moles of reactants were present at the start of the reaction.
    C) How many grams of a single reactant were left over.
    D) The molar mass of only a single reactant
    A) How many total grams of all reactants were used up.
    (this multiple choice question has been scrambled)
  34. Knowing the percent yield and the actual yield (in grams), one could determine:

    A) A & C
    B) The limiting reactant.
    C) B & C
    D) The amount of each reactant used.
    E) The theoretical yield.
    C) B & C
    (this multiple choice question has been scrambled)
  35. Calculate the mass percent composition of calcium in Ca(NO3)2.

    A) 39.2%
    B) 59.6%
    C) 16.2%
    D) 24.4%
    E) 11.6%
    D) 24.4%
    (this multiple choice question has been scrambled)
  36. Determine the number of vanadium atoms in 1.2 x 10-24 g of vanadium.

    A) 2.36 x 10-6
    B) 4.24 x 105
    C) 6.02 x 1023
    D) 1.4 x 1018
    E) 2.72 x 10-22
    D) 1.4 x 1018
    (this multiple choice question has been scrambled)
  37. In the reaction: 2Fe(s) + 3Cl2(g) ->2 FeCl3(s), if 43 grams of iron were reacted, how many moles of iron were reacted?

    A) 0.77
    B) 13
    C) 0.38
    D) 1.5
    A) 0.77
    (this multiple choice question has been scrambled)
  38. What type of reaction is responsible when a free element is converted to a compound?

    A) Violent
    B) Aqueous
    C) Precipitation
    D) Oxidation-reduction
    E) Acid-Base
    D) Oxidation-reduction
    (this multiple choice question has been scrambled)
  39. A compound with molar mass of approximately 80 g/mol has the
    following composition (mass percent): C: 75.9%, H: 6.4%, and N: 17.7%.
    What is its molecular formula?

    A) C5H5N
    B) C5H3N2
    C) CH4N
    D) C3H2N
    E) C4H4N
    A) C5H5N
    (this multiple choice question has been scrambled)
  40. In the reaction: 2Fe(s) + 3Cl2(g) ->2FeCl3(s) (same as question 8), if 43 grams of iron were reacted, how many grams of FeCl3 could be produced?

    A) 125
    B) 43
    C) 62
    D) 250
    A) 125
    (this multiple choice question has been scrambled)
  41. The mass of hydrogen is 1g/mol, so in the reaction:2H2(g) + C(s) -> CH4(g), 2 grams of hydrogen will fully react with one gram of carbon.

    A) True
    B) False
    B) False
  42. A certain acid-base reaction resulted in the formation of the salt, RbNO3, in addition to water. Which acid-base pair could have been used?

    A) RbOH, H2SO4
    B) NaNO3, RbCl
    C) RbOH, HNO3
    D) RbCl, HCl
    E) RbOH, HCl
    C) RbOH, HNO3
    (this multiple choice question has been scrambled)
  43. Eleven moles of water are produced by the reaction of hydrogen and oxygen: 2H2 + O2 -> 2H2O. How many moles of oxygen were used?

    A) 22
    B) 1
    C) 11
    D) 5.5
    D) 5.5
    (this multiple choice question has been scrambled)
  44. How many moles of water may be formed when 12 moles of
    hydrogen gas are mixed with 11 moles of oxygen gas and are allowed to
    react? 2H2 + O2 --> 2H2O

    A) 22
    B) 11
    C) 12
    D) 6
    C) 12
    (this multiple choice question has been scrambled)
  45. Which compound has the highest percent by mass magnesium?

    A) MgBr2
    B) MgSO4
    C) Mg(NO3)2
    D) MgCl2
    E) MgO
    E) MgO
    (this multiple choice question has been scrambled)
  46. 46.



    _______ ions are those that do not participate directly in a reaction.

    A) Spectator
    B) Wasted
    C) Deviant
    D) Armchair quarterback
    E) Left-over
    A) Spectator
    (this multiple choice question has been scrambled)
  47. If 65g of iron react with 170g of Cl2, which reactant is limiting? 2Fe(s) + 3Cl2(g) ->2FeCl3(s)

    A) Cl3
    B) Fe
    C) Cl2
    B) Fe
    (this multiple choice question has been scrambled)
  48. Which has the greatest percent by mass of nitrogen: 100 g of ammonia, or 1 kg of ammonia?

    A) 100 g NH3
    B) They both have the same mass percent composition of nitrogen.
    C) 1 kg NH3
    B) They both have the same mass percent composition of nitrogen.
    (this multiple choice question has been scrambled)
  49. Which compound has a molar mass closest to 100 g/mol?

    A) H2O
    B) PbSO4
    C) C2H5OH
    D) C7H10
    E) CaSO4
    D) C7H10
    (this multiple choice question has been scrambled)
  50. When oxalate ion is mixed with a calcium sulfate solution,
    solid calcium oxalate is formed. Identify the net ionic equation for
    this reaction.

    A) CaSO4 (aq) + H2C2O4 (aq) --? CaC2O4 (s) + H2SO4 (aq)
    B) Ca2+ (aq) + CO4-(aq) --? Ca(CO4)2(s)
    C) Ca2+ (aq) + CO32-(aq) --? CaCO3 (s)
    D) Ca2+ (aq) + C2O42-(aq) --? CaC2O4 (s) (OK)
    D) Ca2+ (aq) + C2O42-(aq) --? CaC2O4 (s) (OK)
    (this multiple choice question has been scrambled)
  51. If
    magnesium were to react with the non-metal fluorine, how many electrons
    would each Mg atom lose, and how many would each F atom gain?

    A) Mg: 2; F: 2
    B) Mg: 1; F: 1
    C) Mg: 1; F: 2
    D) Mg: 2; F: 1
    D) Mg: 2; F: 1
    (this multiple choice question has been scrambled)
  52. Which statement about empirical formulas is false?

    A) An empirical formula may represent different compounds.
    B) Two compounds with the same mass percent of elements must share an empirical formula.
    C) No two compounds may have the same empirical formula.
    D) The empirical formula may be the same as the molecular formula.
    C) No two compounds may have the same empirical formula.
    (this multiple choice question has been scrambled)
  53. Calculate the molar mass of lead(II) nitrate (in g/mol).

    A) 538.4
    B) 476.4
    C) 110.4
    D) 331.2
    E) 269.2
    D) 331.2
    (this multiple choice question has been scrambled)
  54. Which is a valid, general definition of a salt?

    A) Any ion is a salt.
    B) The compound besides water that is formed in an acid-base reaction.
    C) The compound that is formed in an aqueous reaction.
    D) NaCl
    B) The compound besides water that is formed in an acid-base reaction.
    (this multiple choice question has been scrambled)
  55. Fill in the blanks with the words or phrases that make the
    most sense: "If a certain sample of an element contains ____ atom(s),
    the sample weighs _____."

    A) Avogadro's number of ... the atomic mass
    B) Avogadro's number of ... the molar mass
    C) 1 ... molar mass
    D) 1 ... 12.01 amu.
    B) Avogadro's number of ... the molar mass
    (this multiple choice question has been scrambled)
  56. Given the balanced reaction: CCl4 + 2HF -? 2HCl + CCl2F2, identify which statement is incorrect.

    A) 100 CCl2F2 molecules are formed when 200 HF molecules react.
    B) Two HF molecules are required to react with one CCl4 molecule.
    C) One mole of CCl4 will fully react with two moles of HF.
    D) A product mixture containing 20g of HCl indicates 20g of HF reacted.
    E) One molecule of carbon tetrachloride will produce two HCl molecules.
    D) A product mixture containing 20g of HCl indicates 20g of HF reacted.
    (this multiple choice question has been scrambled)
  57. Suppose
    a gross of ping-pong balls weighs 3 kilograms. A client wants to fill
    his truck with ping-pong balls, and his truck will transport only 1000
    kg. How many ping-pong balls may he carry?

    A) 430
    B) 333
    C) 50,000
    D) 4,900
    C) 50,000
  58. In the reaction 2Fe(s) + 3Cl2(g) -> 2FeCl3(s), Which of the following statements is incorrect?

    A) 24 moles of iron will exactly react with 36 moles of Cl2(g).
    B) 6 moles of chlorine gas will produce 9 moles of FeCl2 (s).
    C) 5 moles of iron (III) chloride will be produced from 7 1/2 moles chlorine gas.
    D) 2 moles solid iron require 3 moles gaseous chlorine.
    B) 6 moles of chlorine gas will produce 9 moles of FeCl2 (s).
    (this multiple choice question has been scrambled)

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