11 mark
In which of the following pairs is the first element expected to have a higher electronegativity than the second?
Li, Be
Mg, Sr
Be, Al
Br, Cl
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Chemical Bonding (College Board AP® Chemistry)
Exam Questions
13 mins13 questions21 mark
Which of the following is a non-polar molecule containing polar bonds?
CH3-CH3
CH3-CF3
CH2=CH2
CF2=CF2
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31 mark
Which of the following molecules are paired correctly with their property?
C2H6, good electrical conductivity
CaCl2, low boiling point
NH3, poor electrical conductivity
CuCl2, insoluble in water
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41 mark
Which statement is true about metallic solids?
Atoms are loosely packed into metallic lattices
Atoms lose valence electrons to become negative ions in a sea of delocalized electrons
Metals are held together by Coulombic forces of attraction between positive ions and delocalized electrons
The inner electrons of metal atoms dissociate leading to the formation of metal ions
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51 mark
Which of the following should be considered when determining the Coulombic force between ions?
I. The charge of the ions
II. The mass of the ions
III. The distance between the ions
I only
II only
I and II only
I and III only
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61 mark
Which of the following bonds is likely to have the least ionic character?
B-F
C-N
Mg-O
Si-Cl
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11 mark
The diagram below shows the potential energy as two chlorine atoms approach each other.
As the two chlorine atoms appraoch each other, there is a decrease in energy. This decrease is because
two nuclei are more strongly attracted to two electrons because their magnetic fields interact more strongly.
the effective nuclear charge increases as the atoms approach each other.
the additional attractive force between the two electrons and their opposite nuclei is greater than their repulsive forces.
the core shielding by the electrons diminishes as the two nuclei get closer.
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21 mark
Which statement best describes the intramolecular bonding in a carbonate ion, CO32-?
Only London forces
Electrostatic attraction between pairs of electrons and positively charged nuclei
Permanent dipole permanent dipole forces
Electrostatic attraction between separate carbonate ions
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31 mark
Which of the following compounds has the strongest force of attraction between the anion and cation?
RbI
CsI
CaO
SrS
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41 mark
Which of the following statements accounts for the difference in the polarity of the BF3 and NF3 molecules?
Bond order
Bond polarity
Bonding type
Molecular geometry
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51 mark
Element | Electronegativity |
|---|---|
H | 2.1 |
F | 4.0 |
Si | 1.8 |
S | 2.5 |
Sn | 2.0 |
Te | 2.1 |
Based on the information in the table, which of the following arranges the bonds in order of increasing polarity?
Si-H > S-F > Sn-Te
Sn-Te > S-F > Si-H
Si-H > Sn-Te > S-F
Sn-Te > Si-H > S-F
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11 mark
The graph below shows the potential energy as a function of internuclear distance for sulfur dioxide, SO2, and an unknown heteronuclear diatomic molecule, A-B.
Based on the data in the graph, which of the following correctly identifies the diatomic molecule A-B?
Br-F
Cl-Cl
N≡N
S=S
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21 mark
The graph below shows the potential energy as a function of internuclear distance for two unknown diatomic molecules, A and B.
Which pair of diatomic molecules best represents A and B?
Molecule A | Molecule B | |
|---|---|---|
A | N≡N | I-I |
B | O=O | Br-Br |
C | H-Cl | Cl-Cl |
D | C≡O | H-H |
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