CHM 1040: Final 3/4

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kieu
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82140
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CHM 1040: Final 3/4
Updated:
2011-04-30 01:00:03
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CHM Final
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CHM 1040: Final 3/4
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  1. Calculate the mass percent composition of calcium in Ca(NO3)2.

    A) 24.4%
    B) 39.2%
    C) 11.6%
    D) 16.2%
    E) 59.6%
    A) 24.4%
  2. What type of reaction is responsible when a free element is converted to a compound?

    A) Acid-Base
    B) Precipitation
    C) Aqueous
    D) Violent
    E) Oxidation-reduction
    E) Oxidation-reduction
    (this multiple choice question has been scrambled)
  3. 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) CH4N
    C) C4H4N
    D) C3H2N
    E) C5H3N2
    A) C5H5N
    (this multiple choice question has been scrambled)
  4. Which two compounds have the same empirical formula?

    A) C5H12 and C10H22
    B) CH2O and C6H12O
    C) Mg(OH)2 and Ca(OH)2
    D) C12H10O and C6H3OH
    E) C2H5OH and C6H18O3
    E) C2H5OH and C6H18O3
    (this multiple choice question has been scrambled)
  5. 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)
    B)
    C)
    D)
    B)
    (this multiple choice question has been scrambled)
  6. Which compound has a molar mass closest to 100 g/mol?

    A)
    B)
    C)
    D)
    E)
    D)
    (this multiple choice question has been scrambled)
  7. Which is a valid, general definition of a salt?

    A) The compound that is formed in an aqueous reaction.
    B) The compound besides water that is formed in an acid-base reaction.
    C) Any ion is a salt.
    D) NaCl
    B) The compound besides water that is formed in an acid-base reaction.
    (this multiple choice question has been scrambled)
  8. 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) 6
    B) 22
    C) 11
    D) 12
    D) 12
    (this multiple choice question has been scrambled)
  9. Which of the following reactions could be classified as a double-displacement reaction?

    A)
    B)
    C)
    D)
    A)
    (this multiple choice question has been scrambled)
  10. In one word, why do we use average atomic masses for the elements?

    A) variation
    B) history
    C) isotopes
    D) errors
    C) isotopes
    (this multiple choice question has been scrambled)
  11. 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) 1.5
    B) 13
    C) 0.38
    D) 0.77
    D) 0.77
    (this multiple choice question has been scrambled)
  12. .



    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: 1; F: 2
    B) Mg: 2; F: 1
    C) Mg: 2; F: 2
    D) Mg: 1; F: 1
    B) Mg: 2; F: 1
    (this multiple choice question has been scrambled)
  13. What is the net charge of a precipitate formed by two aqueous solutions?

    A) Neutral, because an insoluble salt compound is formed.
    B) +1, because water is negative.
    C) -1, because water is positive.
    D) It depends upon the situation.
    A) Neutral, because an insoluble salt compound is formed.
    (this multiple choice question has been scrambled)
  14. Consider the generic reaction A + B —? C. This is an example of a

    A) displacement.
    B) synthesis.
    C) oxidation-reduction.
    D) precipitation.
    B) synthesis.
    (this multiple choice question has been scrambled)
  15. Calculate the molar mass of lead(II) nitrate (in g/mol).

    A) 269.2
    B) 538.4
    C) 110.4
    D) 331.2
    E) 476.4
    D) 331.2
    (this multiple choice question has been scrambled)

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