Chem 1205 Recitation #3

Recitation #3

Question 1 & 2: Complete the following table for each combination of ions. The first one has been
completed for reference:
Cation: Anion:
Cation
Charge
Anion
Charge
Combination Ratio
(cation:anion) Compound:
Sodium Chromate +1 -2 2:1 Na2CrO4
Magnesium Fluoride
Ammonium Cyanide
Platinum (IV) Oxide
Lithium Phosphate
Aluminum Carbonate
Question 3 & 4: Name each molecule & draw a Lewis Structure which satisfies the octet rule. Then
determine the shape around the central atom.
Molecule: CBr4 SiS2 SO2
Name:
Lewis Structure:
Shape:
(circle your answer)
Bent
Linear
Tetrahedral
Trigonal Planar
Trigonal Pyramidal
Bent
Linear
Tetrahedral
Trigonal Planar
Trigonal Pyramidal
Bent
Linear
Tetrahedral
Trigonal Planar
Trigonal Pyramidal
Chem 1205 Recitation #3
Question 5-9: Consider each structure & identify any polar bonds. Then determine if the molecule
is polar or nonpolar. The first one has been completed for reference:
Molecule: List any polar bonds: Is the molecule polar or nonpolar?
Example: HCl
H-Cl 1 polar bond = net dipole
The molecule is polar
N2
HCN
HBCl2
SO3
(For reasons not discussed in this
class, sulfur can exceed the octet)
CH3OH, methanol

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