CHEM 101 Fall 08 Exam I(a)
On the answer sheet (scantron) write you 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
1. What is the letter in parentheses at the end of the title line?
a. a
b. b
c. c
d. d
e. e
2. A statement devised to explain some initial observations, which is subject to disproof, is called a
____________.
a. law
b. model
c. qualitative statement
d. hypothesis
e. theory
3. Which below is not a physical property?
a. The substance melts at a particular temperature.
b. The substance expands a certain amount for each degree of temperature elevation.
c. The substance reacts with oxygen to form particular compounds.
d. The substance, in the solid state, is a particular color.
e. All of the above.
4. A sample of gold has a mass of 63.49 g. What is its volume? (Density of gold = 19.3 g/mL)
a. 1225 mL
b. 63.5 mL
c. 44.2 mL
d. 3.29 mL
e. 0.304 mL
5. Which of the following is a metal?
a. helium (He, atomic number 2)
b. nitrogen (N, atomic number 7)
c. sodium (Na, atomic number 11)
d. selenium (Se, atomic number 34)
e. carbon (C, atomic number 6)
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6. What are the products of the dissolution of KHCO3(s) in water?
a. KH2+ + CO32b. K+ + H+ + C + O32c. KH2+ + C + O32d. K+ + HCO3e. K+ + H+ + C + 3 O27. Which of the following statements concerning the atom is false?
a. Chemical reactions involve only the electrons.
b. The atom contains protons, neutrons and electrons.
c. Electrons are found in orbits about the nucleus.
d. The nucleus contains only neutrons.
e. Most of the mass of the atom is found in the nucleus.
8. How many microliters are in 89.63 L?
a. 8.963 1010 µL
b. 8.963 107 µL
c. 8.963 104 µL
d. 8.963 10-4 µL
e. 8.963 10-7 µL
9. Electromagnetic radiation having a wavelength of 475 nm is in the blue region of the visible
spectrum. Converting this wavelength into centimeters yields:
a. 4.75 10-7 cm.
b. 4.75 10-6 cm.
c. 4.75 10-5 cm.
d. 1.86 10-4 cm.
e. 1.86 10-3 cm.
10. Which of the following represent a pair of isotopes ?
37
17
Cl
I
a.
b.
c.
d.
e.
37
18
Ar
II
17
8
O
III
17
9
F
IV
I and II
I and III
I and IV
II and V
III and IV
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40
18
Ar
V
11. An element that has 32 protons and 52 neutrons has an approximate atomic weight of:
a. 20 amu.
b. 32 amu.
c. 52 amu.
d. 60 amu.
e. 84 amu.
12. Which sample contains the fewest atoms?
a. 50 g Xe
b. 25 g Ca
c. 50 g Li
d. 125 g Fe
e. 225 g C
13. Three elements that are likely to have similar chemical properties are:
a. B, C, Ni
b. Ca, Co, Cr
c. Cs, Ba, Ti
d. Cl, Br, I
e. Si, P, S
14. How many grams of Al2O3 will be produced from the reaction of 10 g Al and 20 g MnO?
2 Al(s) + 3 MnO(s)
a.
b.
c.
d.
e.
Al2O3(s) + 3 Mn(s)
0.09 g
5.0 g
9.5 g
19 g
680 g
15. A sample contains 52.0 g of elemental phosphorus, P4. Determine the number of moles of P4 and the
number of atoms of phosphorus present in the sample.
a. 0.419 moles, 2.52 1023 atoms
b. 1.68 moles, 1.01 1024 atoms
c. 0.419 moles, 1.01 1024 atoms
d. 1.68 moles, 4.04 1024 atoms
e. 0.419 moles, 2.79 10-24 atoms
16. In a particular hydrocarbon, 79.89% of the mass is carbon and the remainder is hydrogen. Determine
the empirical formula of the compound.
a. C2H5
b. CH3
c. C3H8
d. C4H10
e. C5H12
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17. How many grams of TiCl4 are needed to produce 0.132 moles of MgCl2 via the reaction?
2 Mg + TiCl4
a.
b.
c.
d.
e.
Ti + 2 MgCl2
6.26 g
12.5 g
5.45 g
25.0 g
50.1 g
18. Classify the following reaction.
C6H12O6(s) + 6 O2(g)  6 CO2(g) + 6 H2O(g)
a.
b.
c.
d.
e.
combustion
exchange
combination
decomposition
displacement
19. The Roman numerals in the reaction given represent the coefficients in the balanced chemical
equation. What are the values of the coefficients?
I BaCl2 + II AgNO3
I
a.
b.
c.
d.
e.
1
1
2
1
1
II
2
1
1
1
2
III
2
2
1
1
1
III Ba(NO3) 2 + IV AgCl
IV
1
2
1
2
2
20. What is the oxidation number of N in NO?
a. -2
b. -1
c. 0
d. +1
e. +2
21. What is being oxidized in the reaction below?
Zn(s) + CuSO4(aq)
a.
b.
c.
d.
e.
ZnSO4(aq) + Cu(s)
Zn
Cu2+
CuSO4
Zn2+
SO42-
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22. Which one of the following is not a redox reaction?
a. Se + O2
SeO2
b. GeO2 + 2H2
Ge + 2H2O
c. Mg + CuCl2
Cu + MgCl2
d. SO2 + H2O
H2SO3
e. 2 CrCl2 + Cl2
2 CrCl3
23. How many grams of KCl are in 125.0 mL of 0.375 M KCl?
a. 3.49 g
b. 0.0469 g
c. 3.49 10-3 g
d. 46.9 g
e. 0.938 g
24. Light has a frequency of 5.45
a. 1.82 106 nm
b. 1.82 10-3 nm
c. 1.82 105 nm
d. 5.50 10-7 nm
e. 550 nm
1014 hertz. What is its wavelength?
25. What is the phenomenon that occurs when certain metals emit electrons when illuminated by
particular wavelengths of light?
a. Planck's constant
b. photoelectric effect
c. line spectrum
d. quantum theory
e. electromagnetic spectrum
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CHEM101 Exam 1
Answer Section
MULTIPLE CHOICE
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