CHEM 219 MODULE 1 QUESTIONS AND ANSWERS

CHEM 219 MODULE 1 QUESTIONS AND ANSWERS

, CHEM 219 MODULE 1 QUESTIONS AND ANSWERS



On a piece of scratch paper write out the Lewis Dot Diagram for each of the listed
elements and for each listed element calculate the following: 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 listed pairs of atoms as ionic, covalent, or polar
covalent. Refer to the table of electronegativities below in making your 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 differing in the connectivity of atoms
in their structural formulae.



Explain, using specific evidence what makes the following two compounds