Unit 5 FRQ Practice Questions with Answers Rated A
1. #1(a) The type of chemical bond present in the Cl2 molecule is a nonpolar
What type of chemical covalent bond. Due to the Cl atoms having no ditterence in elec-
bond is present in the Cl2 tronegativity, there will be no net dipole moment present.
molecule?
2. #1(b) A molecule that is likely to react with Sr in a similar way to how Cl2
Cl2 reacts with the ele- reacts with Sr would be Br2. Elements in the same group (7A) on the
ment Sr to form an ionic periodic table share similar properties as well as the same number
compound. Based on peri- of valence electrons (7).
odic properties, identify a
molecule, X2, that is likely
to react with Sr in a way
similar to how Cl2 reacts
with Sr. Justify your choice.
3. #1(c) Checklist for graph:
A graph of potential ener- - Make dotted and label it
gy versus internuclear dis- - It's negative peak should be closer to the 0-axis.
tance for two Cl atoms is - Peak be shifted to the right
given below. On the same
graph, carefully sketch a
curve that corresponds to
potential energy versus
internuclear distance for
two Br atoms.
4. #1(d) Checklist:
In the box below, draw - Show valence electron work in lined space provided (maybe ok if in
a complete Lewis elec- box, but i asked and she said "if they give you the space you should
tron-dot diagram for the probably show it there")
C2Cl4 molecule - Two central carbon atoms
- Each carbon has two chlorine
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, Unit 5 FRQ Practice Questions with Answers Rated A
- Carbon-carbon is a double bond
- Carbon-chlorine is a single bond
- Each chlorine atom has 3 lone pairs (6 electrons) along with bonds
5. #1(e_i) The hybridization of the C atoms in C2Cl4 is sp^2. Based ott of the
What is the hybridization Lewis electron-dot diagram drawn above, each C atoms is surround-
of the C atoms in C2Cl4? ed by 3 electron domains.
6. #1(e_ii) The approximate chlorine-carbon-chlorine bond angle in C2Cl4 is
What is the ap- 120 degrees (use degree symbol). Based ott of the Lewis elec-
proximate chlorine-car- tron-dot diagram drawn above, each C atom is surrounded by 3 elec-
bon-chlorine bond angle tron regions with 0 of which being lone pairs. This gives a molecular
in C2Cl4 structure of trigonal planar and a bond angle of 120 degrees.
7. #1(e_iii) The C2Cl4 molecule is not polar. Based ott of the Lewis electron-dot
Is the C2Cl4 molecule po- diagram drawn above, we can see that the dipoles electron density is
lar? greater towards the Cl atoms. However, since the trigonal geometry of
the molecule is symmetrical, the individual dipoles cancel out leaving
no net dipole moment.
8. #2(a) Out of there molecules, I2 has the longest bond length. For the listed
The molecular formula of halogens, n increases going down a group with having the largest
diaotmic bromine, chlo- n-value (n=5). Thus I has the largest orbital size out of the halogens
rine, fluorine, and iodine listed. This means the outer electrons for I are the furthers away,
are written below. Circle giving I the largest atomic radius. A larger atomic radius results in
the formula of the mole- a longer bond length between the I atoms.
cule that has the longest
2/8
1. #1(a) The type of chemical bond present in the Cl2 molecule is a nonpolar
What type of chemical covalent bond. Due to the Cl atoms having no ditterence in elec-
bond is present in the Cl2 tronegativity, there will be no net dipole moment present.
molecule?
2. #1(b) A molecule that is likely to react with Sr in a similar way to how Cl2
Cl2 reacts with the ele- reacts with Sr would be Br2. Elements in the same group (7A) on the
ment Sr to form an ionic periodic table share similar properties as well as the same number
compound. Based on peri- of valence electrons (7).
odic properties, identify a
molecule, X2, that is likely
to react with Sr in a way
similar to how Cl2 reacts
with Sr. Justify your choice.
3. #1(c) Checklist for graph:
A graph of potential ener- - Make dotted and label it
gy versus internuclear dis- - It's negative peak should be closer to the 0-axis.
tance for two Cl atoms is - Peak be shifted to the right
given below. On the same
graph, carefully sketch a
curve that corresponds to
potential energy versus
internuclear distance for
two Br atoms.
4. #1(d) Checklist:
In the box below, draw - Show valence electron work in lined space provided (maybe ok if in
a complete Lewis elec- box, but i asked and she said "if they give you the space you should
tron-dot diagram for the probably show it there")
C2Cl4 molecule - Two central carbon atoms
- Each carbon has two chlorine
1/8
, Unit 5 FRQ Practice Questions with Answers Rated A
- Carbon-carbon is a double bond
- Carbon-chlorine is a single bond
- Each chlorine atom has 3 lone pairs (6 electrons) along with bonds
5. #1(e_i) The hybridization of the C atoms in C2Cl4 is sp^2. Based ott of the
What is the hybridization Lewis electron-dot diagram drawn above, each C atoms is surround-
of the C atoms in C2Cl4? ed by 3 electron domains.
6. #1(e_ii) The approximate chlorine-carbon-chlorine bond angle in C2Cl4 is
What is the ap- 120 degrees (use degree symbol). Based ott of the Lewis elec-
proximate chlorine-car- tron-dot diagram drawn above, each C atom is surrounded by 3 elec-
bon-chlorine bond angle tron regions with 0 of which being lone pairs. This gives a molecular
in C2Cl4 structure of trigonal planar and a bond angle of 120 degrees.
7. #1(e_iii) The C2Cl4 molecule is not polar. Based ott of the Lewis electron-dot
Is the C2Cl4 molecule po- diagram drawn above, we can see that the dipoles electron density is
lar? greater towards the Cl atoms. However, since the trigonal geometry of
the molecule is symmetrical, the individual dipoles cancel out leaving
no net dipole moment.
8. #2(a) Out of there molecules, I2 has the longest bond length. For the listed
The molecular formula of halogens, n increases going down a group with having the largest
diaotmic bromine, chlo- n-value (n=5). Thus I has the largest orbital size out of the halogens
rine, fluorine, and iodine listed. This means the outer electrons for I are the furthers away,
are written below. Circle giving I the largest atomic radius. A larger atomic radius results in
the formula of the mole- a longer bond length between the I atoms.
cule that has the longest
2/8
