(use SF, units; show all work; answers in box)
1: For each pair of elements determine whether they will exhibit ionic or covalent bonding.
Then write the empirical formula and name of a reasonable resulting compound.
a: Sr and Cl
b: Si and Br
2: Write the Lewis dot symbols of the reactants and products in the following balanced reactions.
a: 2 K + H2 2 KH
b: 6 Rb + N2 2 Rb3N
c: 3 Ca + 2 P Ca3P2
d: 4 Ga + 3 O2 2 Ga2O3
3: Using only a periodic table, list the following bonds from least polar to most polar:
I - F, K - C, P - P, Si - I
4: Write the Lewis structure for these molecules.
e: HOBrO (structural)
f: PF2OH (structural)
5: Classify these bonds as nonpolar (covalent), polar covalent, or ionic. Briefly explain why.
If it is polar or ionic, state which element it is polar towards.
a: Cd - S
b: S - Si
c: N – S
d: H – P
6: Write the Lewis dot structures for these substances and find the formal charges:
b: NH2 1-
c: NO +
7: Find the Lewis dot structure. Find the formal charges.
8: Draw all the resonance structures for the NO21- ion. For each structure, find the formal charges.
9: Write the Lewis dot structure for TeF2, TeF4 and TeF6. Is the octet rule satisfied for Te?
10: a) Do the LDS for IO31- (the iodate ion). Explain why IO31- is stable but FO31- (fluorate) does not exist.
10. b) Find the Lewis Dot Structure (LDS) of each of the following substances.
(Hint: Structural formula is BrO3OBrO3.)
(Hint: Structural formula is (CH3)2CCHCN.)
11: For each of the following substances find the LDS, then draw the line structure.
Then write the approximate angle(s).
12: For each of the following substances find the LDS, then write the name of the geometry.
Then write the hybridization.
13: For each of the following substances find the LDS, then draw the line structure.
Then determine if it is polar or nonpolar.
(O is central)
14: Describe the geometry around each of the 3 central atoms in the CH3COCN molecule.
(Hint: O is external.)
15: Arrange the following molecules in order of increasing polarity. Show work!
16: Arrange the following molecules in order of increasing dipole moment. Show work!
17: Arrange the following molecules in order of increasing polarity. Show work!
18: How many sigma and pi bonds are there in each of these molecules?
19: Draw Lewis dot structures and give requested information.
polar or nonpolar?
name the geometry
show dipole direction
20: a: The XeOF2 molecule has two different isomers (forms). Do the LDS of XeOF2.
b: Do both line structures. Do they have the same polarity? (Xenon, by coincidence,
has similar electronegativity as other elements in its diagonal.)
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