Name: _____________________
Exam 2: Chemical vs. Physical Changes
Draw the following ionic bonds using a Lewis Dot Structure. (9 points)
K+F
Mg + I
Be + S
Draw the following covalent bonds. (9 points)
F+F
C+O
H+O
Name the following ionic compounds. (6 points)
1. NaCl: _____________________________________________________________________
2. FeS: ______________________________________________________________________
3. CaCO3 : ____________________________________________________________________
Name the following binary covalent compounds. (6 points)
1. SO2 : ______________________________________________________________________
2. N2 O: _______________________________________________________________________
3. H2 O: _______________________________________________________________________
In the boxes below, please draw a particle model for water in a solid, liquid, and gas state.
(3 points)
Solid
Liquid
Gas
Below is a list of ionic vs. molecular compound properties. Assign the properties to the correct
side of the chart. (12 Points)
Ionic Compounds
• Transfers Electrons Between Atoms
• Between Atoms
Molecular Compounds
• Low Boiling Point
• Good Conductivity • Nonmetals Only
• Shares pairs of Electrons
• High Boiling Point
• Typically High Solubility • Only Solids at Room Temperature
• Poor Conductivity
• Gas, Liquid, or Solid at Room Temperature • Variable Solubility • Metal vs. Nonmetal
What mass of solute will dissolve in 100mL of water at the following temperatures? (4 points)
a. KNO at 70° = ____________
b. NaCl at 100°C = ____________
c. NH at 90°C = ____________
d. Which of the above substances is most soluble in water at °C 15? = ____________