Hiram College, Chem. 161 Fall 2007
Chemistry 161
Exam 1
September 21, 2007
Name:____________________________________
Useful Information
F = 9/5 (C) + 32
C = 5/9 (F -32)
1 in = 2.54 cm
1 m = 39.37 in
1 mi = 63,360 in = 1609 m
1 kg = 2.205 lb
1 lb = 453.6 g
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Hiram College, Chem. 161 Fall 2007
Part 1: Multiple Choice
Place the letter of the best answer in the space provided.
____1. PET scans using Tc-99 tracers can be used to detect abnormalities in bone tissue.
PET stands for
a.
b.
c.
d.
positron electrical tomography.
positron emission tomography.
positive electron topography.
positional electronic topography.
____2. The correct name for the formula Cu3(PO4)2 is
a.
b.
c.
d.
copper phosphate.
copper (I) phosphate.
copper (II) phosphate.
copper (III) phosphate.
____3. The average speed of a fastball thrown by “Black Jack” McDowell is 91 mi/h.
The best expression of this in km/h is
a.
b.
c.
d.
146.77 km/h.
1.47  102 km/h.
1.5  102 km/h.
1.50  102 km/h.
____4. A covalent compound differs from an ionic compound in that
a.
b.
c.
d.
covalent compounds have shared electrons.
covalent compounds have higher melting points.
covalent compounds have half-filled bonding orbitals.
covalent compounds have long half-lives.
____5. The correct electron configuration for the chloride ion is
a.
b.
c.
d.
1s22s23s22p63p5
1s22s22p63s23p5
1s22s23s22p63p6
1s22s22p63s23p6
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Hiram College, Chem. 161 Fall 2007
____6. Of the following sets of elements, which contain only elements essential for life?
a.
b.
c.
d.
N, Mg, K, Co, Sc
Ca, Fe, Mg, K, Zn
P, Fe, Mn, Zn, Li
C, H, I, Pb, Ca
____7. In the third row of the periodic table, there are
a.
b.
c.
d.
3 metals, 1 metalloid and 4 non-metals.
3 metals, 2 metalloids and 3 non-metals.
2 metals, 2 metalloids and 4 non-metals.
2 metals and 6 non-metals.
____8. Boron-11 is used in nuclear reactors to absorb excess neutrons because it is a
gamma emitter. When boron-11 undergoes gamma emission, what is the
resulting nucleus?
a.
b.
c.
d.
10
5B
11
5B
11
6B
11
6C
____9. In the covalent compound sulfur dioxide,
a.
b.
c.
d.
sulfur has 8 electrons, two bonds and two lone pairs of electrons.
sulfur has 8 electrons, four bonds and one lone pair of electrons.
sulfur has 10 electrons, two bonds and two lone pairs of electrons.
sulfur has 10 electrons, four bonds and one lone pair of electrons.
____10. Which of the following is not true for a silicon-28 atom (Si):
a.
b.
c.
d.
Silicon has 14 valence electrons.
Silicon has 2 electrons in the 1s orbital.
Silicon has 2 electrons in the 3p orbital.
Silicon has 6 electrons in the 2p orbital.
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Hiram College, Chem. 161 Fall 2007
Part 2: Matching
Place the letter of the description in column 2 with the proper item in column 1.
Column 1
Column 2
____Salt water
a. Form of energy
____Nuclear Fusion
b. Chemical property
____Liquid mercury
c. Physical property
____Magnesium sulfate
d. Physical change
____Concrete
e. Chemical change
____Silicon dioxide
f. Pure elemental substance
____Melting ice
g. Covalent compound
____Boiling point
h. Ionic compound
____Oxidizes in air
i. Homogeneous mixture
____Gamma radiation
j. Heterogeneous mixture
Part 3: Short answer
Give the best answer to the questions below. If doing a calculation, be sure to show all
work for full credit.
1. Phosphorous-32 is a radioactive isotope commonly used in nuclear medicine to detect
eye tumors. It has a half-life of approximately 14 d and decays by beta emission.
a. What is an isotope?
b. How many protons, neutrons and electrons does phosphorous-32 have?
c. Write the balanced nuclear equation for the beta emission decay of
phosphorous-32.
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Hiram College, Chem. 161 Fall 2007
d. Is the resulting nucleus stable? How do you know?
e. 0.68 mg is a typical dosage for an adult patient. How much phosphorous-32
is left in the patient after 21 days?
2. A child was rushed to the hospital by an ambulance traveling at 62 mi/h. The child
weighed 32 lb.
a. The hospital was 41 km from the child’s house. How long did it take the
ambulance to get to the hospital from the child’s house?
b. Normal body temperature is 98.6F. The body temperature of the child
was found to be 38.7C. Did the child have a fever?
c. The child was diagnosed with bronchitis and was ordered ammonium
carbonate as an expectorant. Write the formula for ammonium carbonate.
d. If the typical dosage of ammonium carbonate is 50 mg/kg, how much should
be administered to the child?
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Hiram College, Chem. 161 Fall 2007
3. Nitrogen triiodide is a shock sensitive explosive made from ammonia (NH3) and
elemental iodine (I2).
a. Is nitrogen triiodide ionic or covalent? How can you tell?
b. Write the valence electron configurations for nitrogen and iodine (only outer
shell electrons).
N
I
c. Give the formula for nitrogen triiodide.
d. Draw the Lewis electron dot structure of the compound?
e. What is the geometry around the central atom?
Bonus Question
If you could be anywhere else in the world right now, where would you be?
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