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SCH4U Chapter 4 Quiz

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
What is the bond angle in a bent molecule, such as water?
A
90°
B
104.5°
C
107.3°
D
109.5°
E
120°
 

 2. 
What is the bond angle in a trigonal planar molecule?
A
90°
B
104.5°
C
107.3°
D
109.5°
E
120°
 

 3. 
Which of the following statements about ionic bonding is INCORRECT.
A
The force of attraction between oppositely charged ions (cations and anions) consitutes an ionic bond.
B
Ionic bonding occurs between atoms of elements that have large differences in electronegativity.
C
The units of ionic compounds can be seperated easily by direct heating of the crystal salt.
D
The ions that make up the ionic solid are arranged in a specific array of repeating units.
E
The ions that make up the ionic solid are arranged in a rigid lattice structure so that the cations and anions are arranged so that the system has the minimum possible energy.
 

 4. 
Which one of the following statements about covalent bonding is CORRECT.
A
Covalent bonding involves a balance between the forces of attraction and replusion that act between the nuclei and electrons of two or more atoms.
B
There is an optimum seperation between the individual atoms involved in a covalent bond at which the nucleus-electron repulsions, nucleus-nuclues attractions, and electron-electron attractions acheive a balance.
C
Lithium Sulfide is an example of a molecule with covalent bonds.
D
A covalent bond involves the formation a new orbital, caused by the overlapping of atomic orbitals.  The new orbital has energy levels that are higher than those of the original atomic orbitals.
E
In many cases, electron sharing enables each atom in a covalent bond to acquire full d orbital.
 

 5. 
Which of the following statements about the following structure and molecular polarity diagrams is INCORRECT.
mc005-1.jpg
A
AsH3 has the VSEPR notation AX3E
B
The molecular shape would be classificed as trigonal pyramidal.
C
The difference in electronegativity for As and H is basically zero.
D
The molecule would not have a overall dipole.
E
none of the above are incorrect
 

 6. 
Which of the following statements is CORRECT for two bonded atoms that have very different electronegativities.
A
The atom with the higher electronegativity attracts the shared electrons more strongly than the atom with the lower electronegativity.
B
The atom with the lower electronegativity attracts the shared electrons more strongly than the atom with the higher electronegativity.
C
If the DEN is greater than 0.4 and less than 1.7 the bond is considered polar.
D
both A and C are correct
E
only A is correct
 

 7. 
An expanded valence energy level can be defined as
A
an atom is 8 electons forming around a bonded atom
B
an atom with more than 8 electrons forming around a bonded atom
C
an atom with a maximum of 2 bond
D
an atom following the octect rule
E
none of the above
 

 8. 
The term that is used to refer to the ways in which groups of valence electrons are positioned around the central atom of a molecule.
A
molecular shape
D
bond energy
B
electron group arrangement
E
resonance structures
C
polar bonds
 

 9. 
Electron dot diagrams are used to represent the Lewis model of the arrangement of electrons in atoms. Which of the following statements regarding electron dot diagrams is INCORRECT?
A
It is made up of the chemical symbol and dots indicating the number of electrons in the valence energy level.
B
They can help us represent both atoms or their ions
C
They illustrate the theory that ionic bonds tend to produce full outer orbits of electrons: a configuration exactly the same as that of the noble gases.
D
Four valence orbitals are represented by the four sides of the element symbol.
E
Pairs of dots around the symbol represent the bonding capacity of the atom.
 

 10. 
Binary ionic compounds
A
contain two ions with charges of 2+ and 2–
B
are formed from the combination of two nonmetal ions
C
are composed of only two kinds of monatomic ions
D
contain a transition metal cation
E
contain double bonds
 

 11. 
A student records the following evidence in a lab book.
Unknown Substance
Pure State
Solubility in Water
Solution Conductivity
I
solid
high
low
II
solid
low
low
III
solid
high
none
IV
solid
high
high

Which of the substances shown in the table above is most likely an ionic compound?
A
I
D
IV
B
II
E
none of the above
C
III
 

 12. 
The number of valence electrons in a fluorine atom is
A
1
B
3
C
5
D
7
E
9
 

 13. 
According to the Lewis model of the atom, the number of bonding electrons in a nitrogen atom is
A
1
B
2
C
3
D
5
E
7
 

 14. 
Which of the following atoms is believed to contain three lone pairs of electrons?
A
H
B
Al
C
B
D
C
E
Cl
 

 15. 
Which of the following formulas does NOT represent a molecular compound?
A
CO2(g)
B
CoCl2(s)
C
SO2(g)
D
PCl5(g)
E
HCl(g)
 

 16. 
The concept of multiple covalent bonds is used to explain the molecular formula of
A
O2
B
NaCl
C
C2H6
D
F2
E
NaOH
 

 17. 
Which of the following is the proper electron dot diagram for NaCl?
A
mc017-1.jpg
C
mc017-3.jpg
E
mc017-5.jpg
B
mc017-2.jpg
D
mc017-4.jpg
 

 18. 
If XF2 is the correct formula for a metallic fluoride, then the formula for the oxide of X is
A
X2O
D
XO2
B
XO
E
X2O2
C
XO4
 

 19. 
A metallic element X forms a carbonate with the formula X(CO3)2. The corresponding fluoride compound of element X would have the formula
A
XF
D
X4F
B
XF2
E
XF4
C
X4F2
 

 20. 
When both electrons that make up a bond are provided by the same atom, the bond is called a _________________________ bond.
A
polar covalent
C
co-ordinate covalent
B
ionic bond
D
molecular
 



 
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