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CHEM 219 EXAM 1 QUESTIONS AND ANSWERS
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CHEM 219 EXAM 1 QUESTIONS AND ANSWERS
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CHEM 219 EXAM 1 QUESTIONS AND ANSWERSOn 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 - answer- 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 - 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.
Compound "b" has a 3-carbon chain with a C=O at the end. There is an H attached to
the C of the C=O.
What is the relationship between the compounds shown? Are they the same compound,
constitutional isomers, or two different compounds that are not related to one another?
Explain. - answer- Different compounds that are not related. They have different MF -
(a) C3H8O, (b) C3H6O.
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