2 MODULE UNIT 3
Assignment Part A
1.
a. Explain how electronegativity changes when you move down a group
(column) of the periodic table, from the top to the bottom. 2 marks
- Electronegativity changes when you move down a group of a periodic table by
decreasing as you get further down the group.
b. Explain how electronegativity changes when you move across a period
(row) of the periodic table, from left to right.
2 marks
- Electronegativity changes when you move across a period of a periodic table by
increasing as you move from left to right.
2.
Calculate the difference in electronegativity between the atoms
participating covalent in bonds for each of the following compounds. Then, select
the choice corresponding to the correct structural diagram, including the polarity
of the bonds, for each compound.
a)
HBr Difference: 0.7
i.
b) CH4 Difference: 0.9
i.
Note:
The molecule of CH4 and a few others dont follow the rule weve
established to determine the order of atoms in the formula. According to
our rule, hydrogen should appear first in the formula CH4.
c) NF3 Difference: 1.0
i)
d) Ol2 Difference: 1.0
i)
8 marks
Total 12 marks
Submission Instructions
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