Chapter 12 Test Review: Chemical Bonding

Is the bond formed in a Cl₂ molecule ionic, non polar covalent or polar covalent? Defend your answer.

non polar covalent. the bond is being shared by two identical nonmetals

Is the bond formed between S and Cl ionic, non polar covalent or polar covalent? Defend your answer.

polar covalent. the bond is being shared by two nonmetals

What force holds atoms together in a covalent bond?

valence electrons being shared

When two nitrogen atoms combine to form a nitrogen molecule, how many electrons are shared to give each atom a complete octet?

3

Which atom is the least electronegative, that is, the atom that is least able to attract valence electrons to itself: - Mg - Ba - Cl

Ba

What is a resonance structure? If a molecule has resonance structures, what can you infer about the types of bonds in that molecule?

If one or more Lewis Structure can be drawn for the molecule. There are multiple bonds possible (double, triple bonds).

How many electrons does each of the atoms below need to transfer or share to complete its octet? a. O b. Si c. As

a. O = 2- b. Si = 4- c. As = 3-

How many electrons does each of the atoms below need to gain, lose or share to achieve a noble gas valence electron configuration? a. S b. Mg c. C

a. S = 2- b. Mg = 2+ c. C = 4-

Which of these compounds would *not* have covalent bonds? a. NO₂ b. K₂O c. N₂O₂ d. H₂O₂

b. K₂O