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CHEM 219 EXAM 1 Questions with Correct Answers.
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CHEM 219 EXAM 1Questions with Correct
Answers
Denning [Date] [Course title]
, On a piece of scratch paper, write out the Lewis Dot Diagram for each of the indicated elements and
determine the following for each:
a) The number of Lone Pairs the atom possesses in its valence shell.
b) The number of Unpaired Electrons the atom possesses in its valence shell.
c) The number of bonds the atom will form.
Oxygen
Carbon
Hydrogen
Nitrogen - Correct Answers: Oxygen - a) 2 b) 2 c) 2
Carbon - a) 0 b) 4 c) 4
Hydrogen- a) 0 b) 1 c) 1
Nitrogen - a) 1 b) 3 c) 3
Classify the bonding between the given pairs of atoms as ionic, covalent, or polar covalent. Use the table
of electronegativities shown below to help with the classification.
a. Br and Br
b. K and Cl
c. P and Cl
d. C and O
e. Na and Br - Correct Answers: a. Br-Br: Electronegativity difference () = 0 = COVALENT (or pure
covalent)
b. K-Cl: () = 2.2 = IONIC
c. P-Cl: ()= 0.9 = POLAR COVALENT
d. C-O: ()= 1.0 = POLAR COVALENT
e. Na-Br: () = 1.8 = POLAR COVALENT
Define the term constitutional isomer. - Correct Answers: Two (or more) different chemical compounds
with the same molecular formula but different connectivity between the atoms in their structural
formulae.
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