Name: __________________________________ Period: __________ Date: ____________________
Exam Review for Bonding!
1. Covalent bonds involve the sharing of electrons.
Ionic bonds involve the transferring of electrons.
2. What types of elements form an ionic bond? What types form a covalent bond?
Metal + Non-metal = Ionic Bond
Non-metal + Non-metal = Covalent
3. What is the difference between a cation and anion? Which elements form cations/anions?
Cations are positive ions and Anions are negative ions. Metal atoms form cations and nonmetal atoms form anions.
4. Explain ionic bonds and the 2 types of covalent bonds (polar and non-polar) and the ranges of
Electronegativity values for all 3. Ionic bonds include EN value difference > 1.5
Polar covalent bonds have an EN difference between the range of 0.5 – 1.5 and Non polar
covalent have bonds have an EN difference between the range 0 – 0.5
5. Be able to compare/contrast properties of ionic and covalent compounds.
Ionic Compounds
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•
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ALWAYS crystalline solid at room temperature
VERY HIGH melting points and boiling points
Hard and brittle
Conduct electricity when melted or dissolved in water (ions – aqueous solution)
Usually very soluble in water (dissolves)
Covalent Compounds
Can be solid, liquid or gas at room temperature
Low melting and boiling points
Cannot conduct electricity
Insoluble in water
Polar Covalent bonds – electrons shared unequally and Non-polar covalent bonds –
electrons shared unequally.
6. What is a molecule? Covalent compounds
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•
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7. List the 7 diatomic elements: H2 N2 O2 F2 Cl2 Br2 I2
OR BrINClHOF !
Determine if the following compounds are ionic or covalent. Then name the compound or give the
formula.
Compound Name
I/C
Compound Formula
8. Sulfur trioxide
__C_
SO3
9. Calcium fluoride
__I__
CaF2
10. Tetraphosphorus decoxide
__C __
P4O10
11. Sodium hydroxide
__I___
NaOH
12. Bromine gas
__C___
Br2
13. Potassium acetate
__I_
KC2H3O2
14. Gold (I) oxalate
__I__
Au2C2O4
15. Dicarbon trisulfide
__C___
C2S3
16. Iron II nitride
___I__
Fe(NO3)2
17. Aluminum permanganate
___I__
Al2(MnO4)3
18. Calcium hydroxide
___I__
Ca(OH)2
19. Diboron hexasilicide
__C__
B2Si6
20. Stronitum nitride
__I__
Sr3N2
21. On the back of this paper, 1) draw the Lewis Dot Sharing, 2) use the electronegativity values
to determine the type of bond (Polar/Non-polar), 3) draw the structural formula, and 4)
determine the SHAPE of each of the following molecules.
a. H2O
b. H2CO
c. CH3F
b.
a.
C: 2.5
H: 2.1
H: 2.1
O: 3.5
O: 3.5
3.5 – 2.1 = 1.4 Polar
3.5 – 2.5 = 1.0 Polar
2.5 – 2.1 = 0.4 Non-polar
c.
H: 2.1
C: 3.5
F: 4.0
4.0 – 3.5 = 0.5 Polar
3.5 – 2.1 = 0.4 Non-Polar
22. On the back of this paper, 1) complete the following Lewis Dot Transfers, 2) write the chemical
formula, and 3) name each of the following compounds.
a. Mg and I
b. Ba and N
c. Fe (II) and O
Formula: MgI2
Name: Magnesium iodide
Formula: Ba3N2
Name: Barium nitride
Formula: FeO
Name: Iron II oxide