SUPeR Chemistry
CH 222 Practice Exam
This exam has been designed to help you practice working multiple choice
problems over the material that will be covered on the first CH 222 midterm.
The actual exams for each section of CH 222 will be different and you should
not assume that this practice exam is representative of those exams.
To get the maximum benefit out of this practice exam, treat it like a real exam.
Give yourself one hour to take the test and do not use any outside resources
except your calculator and a periodic table. Do not stop during the exam to
look up answers. When finished, grade yourself using the answer key.
SUPeR Chemistry Practice Exam
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Multiple Choice: Select the one best answer.
1. Based on electronegativity trends in the periodic table, predict which of the following
compounds will have the greatest % ionic character in its bonds.
A. KF
B. CCl4
C. CS2
D. CO2
E. ICl
2. Which type of chemical bonds holds the atoms together within a water molecule?
A. ionic bond
B. nonpolar covalent bond
C. polar covalent bond
D. metallic bond
3. The lattice energy for ionic crystals increases as the charge on the ions
of the ions
.
and the size
A. increases, decreases
B. increases, increases
C. decreases, increases
D. decreases, decreases
4. The lattice energy for CaF2 is the energy change for which one of the following processes?
A. CaF2(g) → Ca2+(s) + 2F-(g)
B. CaF2(s) → CaF2(g)
C. CaF2(s) → Ca(g) + 2F(g)
D. CaF2(s) → CaF2(aq)
E. CaF2(s) → Ca2+(g) + 2F-(g)
5. Which of the following bonds is the most polar?
A. H ⎯ Cl
B. H ⎯ S
C. H ⎯ C
D. H ⎯ F
E. H ⎯ O
6. Complete this statement to make it correct:
Elements with ________________ first ionization energies and ___________ electron affinities
generally form cations.
A. low, very negative
B. high, positive or slightly negative
C. low, positive or slightly negative
D. high, very negative
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•• • Cl
•• • The polarity is best
7. The BrCl molecule may be represented by the electronic formula •• Br
•• • •• •
represented as
A.
δ–
δ–
C.
δ+
δ+
B.
δ+
δ–
D.
δ–
δ+
8. Which type of hybrid orbital is used by carbon in CO2?
A. sp
B. sp2
C. sp3
E. spd2
D. sp3d
9. Calculate (in kJ/mol) the standard enthalpy change ΔH° for the formation of ammonia, as
represented by the reaction written below.
N2(g) + 3H2(g) → 2NH3(g)
Bond:
Bond energy (kJ/mol):
N≡N
945
N=N
418
N–N
160
H–H
432
N–H
391
A. -969
B. -204
C. -105
D. 204
E. 595
10. In which one of the following molecules/ions does the central atom have a formal charge of +2?
A. SF6
B. SO42-
C. O3
11. Which pair is geometrically similar?
A.
SO2 and CO2
C.
CO2 and OF2
B.
PH3 and BF3
D.
SO2 and O3
D. BeCl2
E. AlCl4-
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12. The bond type and molecular polarity of BrF5 are
A.
Bond Type
polar
Polarity of Molecule
nonpolar
B.
polar
polar
C.
nonpolar
polar
D.
nonpolar
nonpolar
13. The structure of the CO32 – ion can be described in the Lewis formulation by the structures
:O
C
O:
:
O:
:
C
2–
:O :
: :
:O
:
O:
:O :
: :
C
: :
: :
:O
2–
:
2–
:O:
which means that
A.
two CO bonds are single bonds, the third CO bond is a double bond.
B.
three independent forms of the CO32 – ion co-exist in equilibrium.
C.
the electrons must be rapidly exchanging among the three forms.
D.
the CO32 – ion exists in only one form which is a composite or average of the three
principal structures shown.
14. Which of the following molecules is nonpolar?
.
A. NH3
B. OF2
C. CH2Cl2
D. H2O
E. BeCl2
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15. What is the electron configuration of Fe3+?
A. [Ar] 3d64s2
D. [Ar] 3d5
B. [Ar] 3d34s2
E. [Ar] 3d6
C. [Ar] 3d44s1
16. A white crystalline compound is quite soluble in water and gives a solution that conducts an
electrical current. When melted, the molten state also conducts an electrical current. From this
evidence the bonding is
A. ionic
C. polar covalent
B. metallic
D. non-polar covalent
17. Which of the following atoms has the lowest 2nd ionization energy?
A. F
B. O
C. Na
D. Mg
E. Li
18. What is the shape of the ClF2– ion as predicted by the VSEPR theory?
A. linear
D. T-shaped
B. bent
E. trigonal planar
C. see-saw
19. The approximate H—C—H bond angle in ethylene, H2CCH2 is
A. 60°
B. 90°
C. 109°
D. 120°
20. Which of the following characteristics apply to the molecule BF3?
1)
trigonal planar molecular geometry
2)
one unshared pair of electrons on B
3)
sp2 hybridized boron atom
4)
polar molecule
5)
polar bonds
A. 2, 4, and 5
D. 1, 3 and 5
B. 1, 3 and 4
E. 3, 4 and 5
C. 1, 2 and 3
E. 180°
SUPeR Chemistry Practice Exam
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