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 ...
Best Grades | Must Pass | Latest Update | Correct Answers | 2024/ 2025
CHEM 219 EXAM 1 Questions and Correct
Answers | Latest Update
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
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
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, Best Grades | Must Pass | Latest Update | Correct Answers | 2024/ 2025
b. K and Cl
c. P and Cl
d. C and O
e. Na and Br
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.
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:
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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