Quiz: Take The Ultimate Chemistry Exam Test!
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- 1.Which one of the following is most likely to be an ionic compound?
- A.
CH4
- B.
O2
- C.
CaCl2
- D.
NH3
- 2.Which of the following compounds has the greatest lattice energy?
- A.
KBr
- B.
KCl
- C.
KI
- D.
KF
- 3.Based on the tendency of atoms to gain or lose electrons to fulfill the octet rule, which of the following ions has an incorrect charge?
- A.
Na+
- B.
O2-
- C.
Ca2-
- D.
Cl-
- 4.Which of the following diatomic molecules has the longest bond length?
- A.
N==N
- B.
Br-Br
- C.
F-F
- D.
O==O
- 5.The measure of an atoms ability to attract electrons towards itself in a chemical bond is known as?
- A.
Electronegativity
- B.
Bond strength
- C.
Electron affinity
- D.
Bond order
- 6.Which of the following compounds has the greatest bond polarity?
- A.
Cl-Br
- B.
Cl-Cl
- C.
NH3
- D.
H-F
- 7.Calculate the oxidation number of the nitrogen atom in NH3.
- A.
0
- B.
+1
- C.
-1
- D.
-3
- 8.Which metal would most likely have the highest melting point?
- A.
Li
- B.
Na
- C.
Ca
- D.
K
- 9.Which bond type best describes the type of bond that will form between O and H?
- A.
Nonpolar convalent
- B.
Mostly ionic
- C.
Mostly covalent
- D.
Polar covalent
- 10.Based on your knowledge of bond energy, which of the following compounds would release the most energy during combustion?
- A.
CH4
- B.
C2H6
- C.
C3H8
- D.
C2OH6
- 11.Use VSEPR theory to predict the geometry of the SF6 molecule.
- A.
T-shaped
- B.
Trigonal bipyramidal
- C.
Tetrahedral
- D.
Octaheadral
- 12.The bond angles found in a molecule with AX5 geometry are?
- A.
90 degrees
- B.
120 degrees
- C.
90 and 120 degrees
- D.
109.5 degrees
- 13.Which of the following bonds has the most ionic character
- A.
C-H
- B.
H-F
- C.
Na-I
- D.
K-F
- 14.What is the CN bond order in H3CCN (assume all atoms obey the octet rule)?
- A.
-1
- B.
+1
- C.
0
- D.
+3
- 15.What is the formal charge on the nitrogen in hydroxylamine, H2NOH?
- A.
-1
- B.
0
- C.
+1
- D.
+5
- 16.Which of the following has the smallest bond angles?
- A.
CO2
- B.
NH3
- C.
SO3
- D.
XeF4
- 17.Which molecule has no dipole moment?
- A.
BrF3
- B.
SO2
- C.
XeBr4
- D.
H2O
- 18.Which of the following molecules is linear?
- A.
NH3
- B.
H2O
- C.
H2S
- D.
CO2
- 19.Which of the following statements is true of methane, CH4?
- A.
It is a tetrahedral molecule
- B.
It is a polar molecule
- C.
It contains single and double bonds
- D.
It contains 60% nitrogen by weight
- 20.Using the bond energies, calculate the enthalpy change for the following combustion reaction.
- A.
-92 kJ/mol
- B.
+921 kJ/mol
- C.
-621 kJ/mol
- D.
+621 kJ/mol
- 21.In the Lewis structure of nitrogen dioxide, NO2, how many pairs of electrons are bonding and how many are non-bonding?
- A.
5 pairs bonding, 4 pairs non-bonding
- B.
3 pairs bonding, 4 pairs non-bonding
- C.
4 pairs bonding, 4 pairs non-bonding
- D.
2 pairs bonding, 2 pairs non-bonding
- 22.Indicate the molecular geometry and the net dipole moment of H3CF
- A.
Tetrahedral, AX4; net dipole moment arrow pointing to the right
- B.
Pyramidal; net dipole moment arrow point to the left
- C.
Bent; net dipole moment arrow pointing to the right
- D.
Planar tetrahedral; net dipole moment arrow pointing to the right
- 23.Briefly explain why Co2 is non-polar and OCS is polar.
- A.
CO2; O==C==O no dipole moment, cancels each out; OCS; O==C==S, contains a dipole moment,does not cancel each out
- B.
CO2 O==C==O contains a dipole moment, does not cancel each other out; OCS O==C==) no dipole moment, cancel each out
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