Che 121 Problem Paper 4 Chemistry Worksheet With Answers Page 3
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712. Give the formula and name for the binary ionic compound that would form
between each of the following pairs of atoms:
a. Na and Cl
b. Na and O
c. Mg and P
d. Ca and O
(a) NaCl, sodium chloride (b) NaO, sodium oxide (c) Mg
P
, magnesium
3
2
phosphide (d) CaO, calcium oxide
13. Calculate the formula weight for the ionic compounds predicted to form
between the following ions:
a. Oxide ions and strontium ions
b. Chloride ions and sodium ions
c. Sodium ions and sulfide ions
-1
(a) SrO, FW = 87.62 + 15.9994 = 64.0648 gmol
-1
(b) NaCl, FW = 22.98977 + 35.4527 = 58.44247 gmol
-1
(c) Na
S, FW = 22.98977 x 2 + 32.066 = 78.04554 gmol
2
14. Give the Lewis structure and identify the molecular geometry (using the
appropriate name of the shape) for the following:
a. Sulfate ion
b. NH
3
c. N
2
(a)
-
S
6e
-
3O
18e
-
2-
2e
-
26e
4 e- regions 0 lone pairs ∴ tetrahedral
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