CHEM 219 Module 1 problem set with
absolute resolutions
, 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.w
Oxygen
Carbon
Hydrogen
Nitrogen - correct ans: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 ans: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
absolute resolutions
, 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.w
Oxygen
Carbon
Hydrogen
Nitrogen - correct ans: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 ans: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
