Name: ________ANSWER KEY________________________ Date: ____________________________ Period: _______
Unit 7 Test Study Guide
Chemical Bonding – Lewis Structures & VSEPR Theory
Concepts
 Determine valence electrons using the periodic table
 Draw the lewis dot diagrams for neutral atoms and ions
 Distinguish between lone pairs and bonds in lewis structures
 Draw the lewis structures for different compounds
 Define polarity and electronegativity
 Determine and identify the polarity of different bonds (
)
 Identify a central atom (*)
 Determine the molecular geometry of a central atom using the VSEPR Reference Sheet
Example/Practice Questions
1. Draw the Lewis Dot Diagrams for the following atoms/ions:
a. Cl
b. Zn+2 Zn c. P
2. Complete the following table:
d. O
e. Ca
f. Se2-
Shape
(Geometry)
Polar or Nonpolar?
HF
Linear
P
BH3
Trigonal Planar
NP
SO2
Bent
P
H2O
Bent
P
PI5
Trigonal
bipyramidal
NP
CH2Cl2
Tetrahedral
Depends on how you
arranged the Hs and
Cls
NO3 -
Trigonal planar
P
Formula
Lewis Structure
Has resonance structures
3. How does electronegativity relate to polarity? Answers will vary – Review your notes & Quiz Study Guide
Chemical Bonding – Naming and Writing Chemical Compounds
Concepts
 Recognize ionic vs covalent (molecular) vs metallic bonds
 Define and recognize cation vs anion, relate to metal vs nonmetal
 Distinguish between chemical formulas, ion symbols, polyatomic ions, and chemical nomenclature
 Determine ion charges using periodic table
 Know the 9 Polyatomic ions
 Apply rules to Name ionic compounds
 Apply rules to write ionic compound chemical formulas
 Apply rules to Name molecular compounds
 Apply rules to write molecular compound chemical formulas
 Show writing names from formulas, and formulas from names for both types of compounds
Example/Practice Questions
4. Identify whether the following are made up of ionic (I) or covalent (C) or metallic (M) bonds
a. sodium chloride I
b. aluminum foil M c. iron(II) oxide I
d. CH4 C
5. Write the name of each ion and identify if it is anion or cation
a. Na+ Sodium ion (cation)
d. N-3 nitride ion (anion)
b. Cl Chloride ion (anion)
e. Fe+3 iron (III) ion (cation)
c. Mg+2 Magnesium ion (cation)
f. PO43- phosphate ion (anion)
6. Circle the molecular compounds below and box the ionic compounds.
a. C2H4
b. C6H12O6 (sugar)
c. K2O
d. H2O
e. NH3
f. CO2
g. AlCl3
7. Identify whether the following are ionic (I), molecular (M) and name each
a. NO2
b. TiCl3
c. HCl
M – nitrogen dioxide
I – Titanium chloride
I – hydrogen chloride (hydrochloric acid)
d. SCl4
e. HNO3
f. Ba(OH)2
M – sulfur tetrachloride
I – Hydrogen nitrate
I – barium hydroxide
8. Write the corresponding chemical formula
a. ammonium nitrate NH4NO3
c. nitrous acid - DON’T DO
b. dinitrogen tetrafluoride
N2F4
d. calcium hydroxide Ca(OH)2
9. Write the name of the following ions and identify as cation or anion:
a. Ca+2 Calcium ion (cation)
b. Fe+2 Iron (II) ion (cation)
c. Br-1 Bromide ion (anion)
d. CO3-2 Carbonate ion (anion)
10. Write the symbol and charge of the following ions and identify as cation or anion:
a. Nitride ion N3- (anion) b. Nitrate ion NO3- (anion)
c. Manganese (II) ion Mn2+ (cation)
11. Write the chemical formula and name for each ionic compound.
Ion
P3CO32OH3+
Al
AlP
Al2(CO3)3
Al(OH)3
12. Identify whether each of the following compounds are ionic (I) or covalent (C). If provided with the
chemical formula, write the chemical name for the compound (remember to use roman numerals on our
transition metals). If provided with the chemical name, write the chemical formula for the compound.
a. Sodium Phosphide I - Na3P
h. Ag2O
I - Silver Oxide
b. Iron (III) Sulfide
I – Fe2S3
i. Zinc Bromide
I - ZnBr2
c. CO2
C – carbon dioxide
j. Lithium Oxalate I – Li2C2O4
d. Aluminum Carbonate I - Al2(CO3)3
k. KCN
I - Potassium cyanide
e. P2O5
C – diphosphorous pentoxide
l. NO3
C – nitrogen trioxide
f. Carbon Tetrafluoride C – CF4
m. Ammonium Fluoride
I – NH4F
g. CuCl2
I – Copper (II) Chloride
n. Manganese (II) Sulfide MnS