Chemical Formulas and Chemical Compounds – tseeley – home

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                                                         CHAPTER 7 REVIEW

                  Chemical Formulas and Chemical Compounds

          MIXED REVIEW
        SHORT ANSWER                      Answer the following questions in the space provided.

          1. Write formulas for the following compounds:

                                                           a. copper(II) carbonate

                                                           b. sodium sulfite

                                                           c. ammonium phosphate

                                                           d. tin(IV) sulfide

                                                           e. nitrous acid

          2. Write the Stock names for the following compounds:

                                                                                a. Mg(ClO4)2

                                                                                b. Fe(NO3)2

                                                                                c. Fe(NO2)3

                                                                                d. CoO

                                                                                e. dinitrogen pentoxide

          3.                                               a. How many atoms are represented by the formula Ca(HSO4)2?

                                                           b. How many moles of oxygen atoms are in a 0.50 mol sample of this
                                                              compound?

                                                           c. Assign the oxidation number to sulfur in the HSO4 anion.

          4. Assign the oxidation number to the element specified in each of the following:

                              a. hydrogen in H2O2

                              b. hydrogen in MgH2

                               c. sulfur in S8

                              d. carbon in (CO3)2

                               e. chromium in Na2Cr2O7

                               f. nitrogen in NO2



        MODERN CHEMISTRY                                                                              CHAPTER 7 MIXED REVIEW   61
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  MIXED REVIEW continued

  PROBLEMS Write the answer on the line to the left. Show all your work in the
  space provided.

   5.                        Following are samples of four different compounds. Arrange them in
                             order of increasing mass, from smallest to largest.
                             a. 25 g of oxygen gas                    c. 3  1023 molecules of C2H6
                             b. 1.00 mol of H2O                       d. 2  1023 molecules of C2H6O2




   6.                        a. What is the formula for sodium hydroxide?

                             b. What is the formula mass of sodium hydroxide?




                             c. What is the mass in grams of 0.25 mol of sodium hydroxide?




   7.                        What is the percentage composition of ethane gas, C2H6, to the nearest
                             whole number?




   8.                        Ribose is an important sugar (part of RNA),with a molar mass of
                             150.15 g/mol. If its empirical formula is CH2O, what is its molecular
                             formula?




  62     CHAPTER 7 MIXED REVIEW                                                            MODERN CHEMISTRY
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          9. Butane gas, C4H10, is often used as a fuel.

                                                           a. What is the mass in grams of 3.00 mol of butane?




                                                           b. How many molecules are present in that 3.00 mol sample?




                                                           c. What is the empirical formula of the gas?




        10.                                                Naphthalene is a soft covalent solid that is often used in mothballs. Its
                                                           molar mass is 128.18 g/mol and it contains 93.75% carbon and 6.25%
                                                           hydrogen. Determine the molecular formula of napthalene from this
                                                           data.




        11. Nicotine has the formula CxHyNz. To determine its composition, a sample is burned in excess
            oxygen, producing the following results:
               1.0 mol of CO2
               0.70 mol of H2O
               0.20 mol of NO2
               Assume that all the atoms in nicotine are present as products.

                                                           a. Determine the number of moles of carbon present in the products
                                                              of this combustion.




        MODERN CHEMISTRY                                                                         CHAPTER 7 MIXED REVIEW          63
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                                 b. Determine the number of moles of hydrogen present in
                                    the combustion products.




                                  c. Determine the number of moles of nitrogen present in the
                                     combustion products.




                                 d. Determine the empirical formula of nicotine based on your
                                    calculations.




                                  e. In a separate experiment, the molar mass of nicotine is found to be
                                     somewhere between 150 and 180 g/mol. Calculate the molar mass
                                     of nicotine to the nearest gram.




  12. When MgCO3(s) is strongly heated, it produces solid MgO as gaseous CO2 is driven off.

                                               a. What is the percentage loss in mass as this
                                                  reaction occurs?




                                               b. Assign the oxidation number to each atom in MgCO3?




                                               c. Does the oxidation number of carbon change upon
                                                  forming CO2?



  64     CHAPTER 7 MIXED REVIEW                                                                MODERN CHEMISTRY
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        Name                                                                          Date                    Class


                                                         CHAPTER 7 REVIEW

                  Chemical Formulas and Chemical Compounds

          MIXED REVIEW
        SHORT ANSWER                      Answer the following questions in the space provided.

          1. Write formulas for the following compounds:
                              CuCO3                        a. copper(II) carbonate
                             Na2SO3                        b. sodium sulfite
                          (NH4)3PO4                        c. ammonium phosphate
                                SnS2                       d. tin(IV) sulfide
                              HNO2                         e. nitrous acid

          2. Write the Stock names for the following compounds:
                         magnesium perchlorate                                  a. Mg(ClO4)2
                                 iron(II) nitrate                               b. Fe(NO3)2
                                 iron(III) nitrite                              c. Fe(NO2)3
                                cobalt(II) oxide                                d. CoO
                              nitrogen(V) oxide                                 e. dinitrogen pentoxide

          3.                13 atoms                       a. How many atoms are represented by the formula Ca(HSO4)2?
                             4.0 mol                       b. How many moles of oxygen atoms are in a 0.50 mol sample of this
                                                              compound?
                                 6                         c. Assign the oxidation number to sulfur in the HSO4 anion.

          4. Assign the oxidation number to the element specified in each of the following:
                  1           a. hydrogen in H2O2
                   1          b. hydrogen in MgH2
                    0          c. sulfur in S8
                  4           d. carbon in (CO3)2
                   6           e. chromium in Na2Cr2O7
                   4           f. nitrogen in NO2



        MODERN CHEMISTRY                                                                              CHAPTER 7 MIXED REVIEW   61
        HRW material copyrighted under notice appearing earlier in this work.
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