Structures and Bonding Test #2
Name:_____________
Exp 3.4
1. Which of the following will have a higher melting point?[3 marks]
A) ClHF2 or KCH3COO B) C(trigonal planar) or Al2O3
C) Cl2 or Br2
__________
___________
________
2. Which of the following would most likely be a gas at room temperature?
[2 marks]
A) ClF3 or PHF2
B) CCl4 or PH3
__________
__________
3. Which of the following would have a lower boiling point?[2 marks]
C) N2H4 or C2H4
D) PCl3 or BCl3
__________
___________
4. Choose one of the following: [6 marks, provide verification]
a) Explain the expected difference in lustre of Iron and coal (C)
b) Explain the expected difference in hardness between calcium sulfate
and Lead.
6. Identify any intermolecular and intramolecular attractions in 1.0 g
samples of each of the substances below. [7 marks]
a) H3N
Inter____________ Intra_____________
b) PHAt2
Inter____________ Intra_____________
Exp 2.1
1. Match the following terms with their descriptions [10 marks]
___1. ionic solid
A) 3-D attraction of non-metals
___2. non-polar molecular solid B) delocalized electrons
___3. Covalent network
C) strongest intermolecular attraction
___4. metallic solid
D) weakest of attractions
___ 5. Dipole-dipole
E) attracted by instantaneous dipole
___ 6. Instantaneous Dipole (LD)F) 3-D lattice of ions
___ 7. Hydrogen bonding
G) produces two regions of charge
___ 8. Pure covalent bond
H) common with polar molecules
___ 9. Polar covalent bond
I) electrons equally attracted to 2 nuclei
___ 10. Triple bond
J) 3 shared electron pairs
Exp 2.3
2. Explain using the molecule H2AsF3 how VSEPR can be employed to explain
molecular polarity. [6 marks]
3. a) Use the concept of hybridization to explain the shape of C2H2. [4
marks]
B) Differentiate between sigma and pi bonds. Label each both on your
molecular diagram. [5 marks]
4.i) Using your knowledge of VSEPR predict and name the shapes of the
following molecules. Justify your answer. [9 marks]
ii) Identify those molecules that contain coordinate covalent bonding.
A) SeOCl4
C) Krl2
D) PO33-
E) BrF2 1-
F) PO2
G) SO32-
5. Choose one of the following: [4 marks]
A) Explain how it is possible for S to form SF2, SF4 , and SF6
B) Explain why XeF4 and SF4 do not have the same 3-D shape
Exp 2.4
+
6. Rank the following molecules according to the strength of their
intermolcular attractions and provide your reasoning. [6 marks]
SiOCl, SeH3Cl3, PHO
7. Based on your knowledge of molecular polarity, rank the following
substances from most soluble to least soluble in the solvent hexane (C6H14).
Show your reasoning. [6 marks]
A) XeCl4
B) IF5
C) CSH2
D) Cl2Te
Exp 2.5
Predict the properties (state, solubility in water, hardness) of the products
formed in the following after the reaction and isolation of the products has
occurred.
a) sulfuric acid is reacted with magnesium.
b)