4.E: Valence Electrons and Bonding (Exercises)

Exercises

1: Identify whether each compound(s) is/are ionic.

1. NaI
2. Au₂CO₃
3. N₂O
4. SiO₂

Answer

Only answers (a) and (b) are ionic compounds. Both formulas begin with a metal (atom from the left side of the periodic table) ion.

2: Identify whether each compound(s) is/are covalent.

1. SiH₃
2. C₆H₅Cl
3. KC₂H₃O₂
4. Ca(OH)₂

Answer

Only answers (a) and (b) are covalent compounds. Both formulas begin with nonmetals and/or metalloids (atoms from the right side of the table)

3: Write the formula for each ionic compound.

1. magnesium sulfite
2. aluminum nitride
3. mercury II hydroxide
4. ammonium oxide

Answer

a. MgSO₃ b. AlN c) Hg(OH)₂ d) (NH₄)₂O

4: Write the formula for each covalent compound.

1. iodine trichloride
2. disulfur dibromide
3. arsenic trioxide
4. xenon hexafluoride

Answer

a. ICl₃ b. S₂Br₂ c. AsO₃ d. XeF₆

5: Which covalent species would be considered free radicals?

1. hydrogen monoxide
2. carbon dioxide
3. phosphorus disulfide
4. ammonia (NH₃)

Answer

1. silicon tetrafluoride
2. nitrogen dioxide
3. carbon disulfide
4. diphosphorus pentoxide

Answers

1.

2.

3.

4.

9. 1. ICl₃
   2. S₂Br₂
   3. AsO₃
   4. XeF₆

11. H₂O and NH₃ (water and ammonia) (answers will vary)