CHEM 101 Fall 09 Exam 1 (a)
On the answer sheet (scantron) write your name, student ID number, and recitation section
number. Choose the best (most correct) answer for each question and enter it on your answer
sheet.
Potentially useful data:
Avogadro’s number: 6.022 x 1023
Speed of light: c = 3.00 x 108 m/s
Planck constant: h = 6.626 x 10-34 J·s
E = hc/λ = hν
1. Please choose the letter “a” as your answer for this question.
2. All of the following properties of a substance can aid in its identification except:
a. density.
b. temperature.
c. reactivity.
d. melting point.
e. boiling point.
3. Which of the following is a chemical property of iron?
a. Iron conducts heat.
b. Iron conducts electricity.
c. Iron melts at 1535°C.
d. Iron can be bent into shapes.
e. Iron rusts on exposure to water and oxygen.
4. Which is the best definition of a pure substance?
a. A material that contains two or more types of atoms.
b. A material in the gas phase.
c. A material whose properties cannot be changed by further physical separation.
d. A material whose properties have been measured.
e. A material that has been heated.
5. All atoms of a given element are chemically identical. This is an example of:
a. The Law of Conservation of Mass.
b. Dalton's Atomic Theory.
c. The Law of Constant Composition.
d. The Law of Multiple Proportions.
e. The Law of Conservation of Energy.
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6. The Millikan oil drop experiment was used to determine
a. whether the atom was radioactive.
b. the electron distribution in the atom.
c. the atomic number of an atom.
d. the charge of an electron.
e. the nuclear character of the atom.
7. Calculate the number of grams in 0.928 moles of nitrogen molecules (N2).
a. 14.0 g
b. 28.0 g
c. 13.0 g
d. 26.0 g
e. 30.2 g
8. How many grams of argon (Ar) contain the same number of atoms as 27 g of aluminum (Al)?
a. 18 g
b. 27 g
c. 31 g
d. 40 g
e. 67 g
9. How many hydrogen atoms are in a 27.0 g sample of water (H2O)?
a. 1.50
b. 2.99
c. 4.98 × 10-24
d. 1.81 × 1024
e. 2.93 × 1026
10. Which sample contains the greatest number of atoms?
a. 50 g Ba
b. 50 g Br
c. 50 g Ca
d. 50 g Ti
e. 50 g P
11. Which element can be classified as a transition metal?
a. Ar
b. N
c. F
d. Co
e. Rb
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12. Which of the following is not an ionic compound?
a. TiO2
b. KMnO4
c. CH4
d. Na2SO3
e. Ca(CH3COO)2
13. What are the products of the dissolution of NaH2PO4(s) in water?
a. NaH23+ + PO43b. Na+ + 2H+ + P + 4O2c. Na+ + H2 + P + 2O2
d. Na+ + H2PO4e. Na+ + H+ + P + O4214. Determine the number of molecules in 325 mg of aspirin, C9H8O4.
a. 1.81 × 10-3
b. 1.09 × 1021
c. 3.34 × 1023
d. 1.09 × 1024
e. 3.34 × 1026
15. In the reaction given below, how many grams of sodium metal are consumed if 2.02 g of
a.
b.
c.
d.
e.
hydrogen gas are produced?
2 Na(s) + 2 H2O(l) → 2 NaOH(aq) + H2(g)
92.0 g
5.75 g
11.5 g
23.0 g
46.0 g
16. Classify the following reaction.
2 Al(s) + 3 CuSO4(aq) → Al2(SO4)3(aq) + 3 Cu(s)
a.
b.
c.
d.
e.
combination
decomposition
combustion
dissolution
displacement
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17. The Roman numerals in the reaction given represent the coefficients in the balanced chemical
equation. What are the values of the coefficients?
I CH3OH + II O2  III CO2 + IV H2O
I
a.
b.
c.
d.
e.
1
1
2
2
4
II
2
3
3
5
6
III
1
1
2
2
4
IV
2
2
4
2
8
18. How many moles of ammonia will be formed from the complete reaction of 45.0 g of H2?
N2 + 3 H2 → 2 NH3
a.
b.
c.
d.
e.
11.1 mol
14.9 mol
16.7 mol
7.43 mol
22.3 mol
19. How many grams of MgI2 are produced by the reaction of 25.0 g of Mg with 25.0 g of I2?
Mg + I2 → MgI2
a.
b.
c.
d.
e.
9.20 g
18.4 g
27.4 g
49.0 g
195 g
20. Which substance gets reduced in the reaction below?
Na2SO4 + 4 C → Na2S + 4 CO
a.
b.
c.
d.
e.
CO
C
Na2S
Na2SO4
this is not an oxidation-reduction reaction
3-
21. What is the oxidation number of P in PO4 ?
a. +5
b. +3
c. -2
d. -3
e. -5
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22. Which of the following reactions are oxidation reduction reactions?
I) Ca + 2 H2O → Ca(OH)2 + H2
II) CaO + H2O → Ca(OH)2
III) Ca(OH)2 + H3PO4 → Ca3(PO4)2 + H2O
IV) Cl2 + 2 KBr → Br2 + 2 KCl
a.
b.
c.
d.
e.
I and II
II and III
I and IV
III and IV
I and III
23. Determine the volume of solution that contains 15.0 g of AgNO3 if the solution is 0.375 M.
a. 31.5 mL
b. 33.1 mL
c. 235 mL
d. 447 mL
e. 956 mL
24. Dental lasers are based on neodymium yttrium aluminum garnet (Nd-YAG) crystal, with an
emission wavelength of 1066 nm. What is the frequency of this laser?
2.81 × 105 Hz
2.81 × 1014 Hz
3.20 × 1018 Hz
3.20 × 102 Hz
3.55 × 10-15 Hz
a.
b.
c.
d.
e.
25. Which statement below is false?
a. The wavelength of light is the distance between two corresponding points in the
b.
c.
d.
e.
wave pattern.
The frequency of light is the number of waves that pass a given point in a second.
The frequency of light increases as wavelength decreases.
The higher the frequency of light, the greater its energy.
The higher the frequency of light, the longer the wavelength.
26. Of the following, __________ radiation has the longest wavelength and __________ radiation
has the greatest energy.
gamma
a.
b.
c.
d.
e.
ultraviolet
ultraviolet, gamma
visible, ultraviolet
gamma, gamma
visible, gamma
gamma, visible
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visible
CHEM101 Exam 1
Answer Section
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