CHEM 219 EXAM 1 QUESTIONS AND
ANSWERS GRADED A+
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 ato...
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 - Answer✔✔-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. - Answer✔✔-Two (or more) different chemical
compounds with the same molecular formula but different connectivity between the atoms in
their structural formulae.
Explain (using specific evidence) what makes the following two compounds constitutional
isomers of one another: - Answer✔✔-Both compounds have a MF of C3H6O - same MF.
Compound "a" has a 3-carbon chain with a C=O in the middle. No H atom connected to C of
C=O.
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