Chapter 4_ Atoms and Elements by hcj


									Hall                                                         Chemical Structures and Interactions                                                      GHAMAS

                                                    Chapter 6 – Chemical Composition
             Students should take notes on the following topics/concepts. Notes can be handwritten or electronic. Notes are not collected or graded.

Section 6.1 How Much Sodium?
             No notes required from this section. However, a “mole map” diagram will be provided in class.

Section 6.2 Counting Nails by the Pound
       1.    “With atoms, however….”

Section 6.3 Counting Atoms by the Gram
       2.    Define:
                  a.  mole (mol)
                  b.  Avogadro’s number
       3.    Write the two conversion factors used to convert between moles and number of atoms.
       4.    Examples of mole:particle conversions (provided in class)
       5.    Define:
                 a. molar mass (In addition, copy the rest of the indented paragraph from the middle of p. 167 of textbook.)
       6.    Examples of mole:gram conversions (provided in class)
       7.    Examples of gram:particle conversions (provided in class)

Section 6.4 Counting Molecules by the Gram
       8.    “For compounds, the molar…in atomic mass units.)

Section 6.5 Chemical Formulas as Conversion Factors
       9.    Copy the three conversions between O (oxygen) and CO 2 from the top half of page 173 of textbook.
       10.   Copy “Example 6.5” from pages 173-4 of your textbook.
       11.   “The conversions between…..inherent in the chemical formula.”
       12.   Copy “Example 6.6” from pages 175-6 of your textbook.

Section 6.6 Mass Percent Composition of Compounds
       13. Define:
               a. mass percent composition (aka mass percent)
       14. Copy the formula for mass percent from the top of page 177 of the textbook.
       15. “Mass percent composition….grams of the compound.”
       16. Copy “Example 6.7” from page 178 of the textbook.

Section 6.7 Mass Percent From a Chemical Formula
       17. Copy the first paragraph of this section and the formula for “mass percent of element X”.
       18. Examples of calculations of mass percent from a chemical formula (provided in class).

Section 6.8 Calculating Empirical Formulas for Compounds
       19. Define:
               a. empirical formula
               b. molecular formula
       20. “We can get a chemical …. represent a molecule.”
       21. Copy the table from the lower half of page 182 of the textbook. (Omit the “molecule” column.)
       22. “Notice in some cases….where n = 1, 2, 3 ….”
       23. Copy the margin note from page 183 of the textbook.
       24. Copy the steps (left column) for “Obtaining an Empirical Formula From Experimental Data” from the tan shaded box
           on pages 183-4 of the textbook.
       25. Examples of calculations of empirical formulas from experimental data (provided in class).

                                                                          Page 1 of 2
 Hall                                                   Chemical Structures and Interactions                                          GHAMAS

Section 6.9 Calculating Molecular Formulas for Compounds
        26. “…the molecular formula is always a whole number multiple of the empirical formula.”
        27. Define:
                a. empirical formula molar mass
        28. Examples of calculating molecular formulas for a compound (provided in class).

Please note: Homework is collected and graded. For any problems requiring calculations, you must show the work/set for the problem.

            Section                   Problems/Questions Assigned

               6.1         none

               6.2         none
                           3, 4, 5, 7, 17, 18, 23, 24, 25a&b, 27, 32, 33
                           8, 6, 37, 38, 41, 42

               6.5         45, 49

               6.6         11, 53, 55, 57, 59

               6.7         64, 65

               6.8         69, 71, 72, 77

               6.9         79, 80

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