CHEM 101 Final: CHEM 101 Drexel CHEM 101 Final Exam WINTER 09 10 with answers
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CHEM 101 WINTER 09-10 FINAL EXAM
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.
Avogadro’s Number: 6.022 × 1023 mol-1 P1V1 / n1T1 = P2V2 / n2T2
Speed of Light: c = 3.00 x 108 m s-1 PV = nRT
Planck’s Constant: h = 6.626 x 10-34 J s d = PM / RT
Rydberg Constant: R = 2.179 x 10-18 J R = 0.0821 L atm mol-1 K-1
E = hc/λ = hυ 1 atm = 760 Torr = 760 mm Hg
q = mcΔT Specific Heat of Water = 4.184 J g-1 °C-1
h1d1 = h2d2 C1V1 = C2V2
1. Please chose the letter “a” as your answer for this question.
2. Which of the following represents either a chemical property or a change in a chemical property?
a. Br2 (l) → Br2 (g)
b. Gold is both very malleable and very ductile.
c. High purity water has a resistance ≥ 18.2 M
Ω
·cm
d. A metal more easily conducts electricty at a low temperature.
e. 2 H2O (l) → 2 Η2 (g) + Ο2 (g)
3. Which of the following compounds can be dissolved in water to give a solution that conducts electricity?
a. C8H18 (2,2,4,-trimethylpentane)
b. C6H12O6 (glucose)
c. CHCl3 (chloroform)
d. KClO4 (potassium perchlorate)
e. (CH3)2CHOH (isopropyl alcohol)
4. Which of the following is not a metal?
a. cobalt (Co, atomic number 27)
b. indium (In, atomic number 49)
c. selenium (Se, atomic number 34)
d. lithium (Li, atomic number 3)
e. beryllium (Be, atomic number 4)
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5. When neutral atoms gain one or more electrons, ____ are formed.
a. hadrions
b. cations
c. fermions
d. deuterions
e. anions
6. Which two of the following represent a pair of isotopes?
P P P S S
I. II. III. IV. V.
a. I and IV
b. III and IV
c. I and III
d. I and II
e. II and V
7. Which of the following consists of a pair of allotropes?
a. air and oxygen
b. phosgene, O=C–(Cl)2 and phosphine, PH3
c. red phosphorus and white phosphorus
d. carbon tetrachloride and carbon tetrabromide
e. yellow sulfur and yellow phosphorus
8. An element that has 24 protons, 24 electrons, and 28 neutrons has a molar mass of ______.
a. 76 amu.
b. 56 amu.
c. 52 amu.
d. 48 amu.
e. 84 amu.
9. Three elements that are likely to have similar chemical and physical properties are:
a. Ca, Co, Cr
b. H, He, Ne
c. Pb, Bi, Po
d. B, C, Si
e. Na, K, Li
10. Which formula and name combination is incorrect?
a. SF6 and sulfur hexafluoride
b. N2O3 and dinitrogen tetraoxide
c. P4O10 and tetraphosphorus decaoxide
d. AsBr5 and arsenic pentabromide
e. SeF4 and selenium tetrafluoride
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11. What is the correct general formula for a straight-chain alkene?
a. CnH2n+2
b. CnHn+2
c. CnHn
d. CnH2n−2
e. CnH2n
12. Determince the correct combination of protons and electrons for the phosphide ion, P3–.
a. 18 protons and 10 electrons
b. 16 protons and 12 electrons
c. 15 protons and 18 electrons
d. 15 protons and 12 electrons
e. 12 protons and 24 electrons
13. Determine the number of moles of water in a liter of water (density = 1000. g / L), and the Molarity of
water, respectively
a. 56 and 74
b. 18 and 56
c. 18 and 18
d. 18 and 74
e. 56 and 56
14. Which statement regarding the complete combustion of a hydrocarbon is incorrect?
a. The hydrocarbon is consumed in the reaction and must be shown in the balanced chemical
equation.
b. Heat is produced in the reaction but does not need to be shown in the balanced chemical
equation.
c. Balancing the chemical equation requires knowledge of the physical state of each reactant
and each product.
d. Oxygen is the oxidizing agent and must be shown in the balanced chemical equation.
e. Carbon dioxide and water are produced in the reaction and must be shown in the balanced
chemical equation.
15. Assuming an excess of aluminum, how many moles of aluminum tribromide can be produced from 111
moles of bromine?
2 Al + 3 Br2 2 AlBr3
a. 167
b. 56
c. 111
d. 148
e. 74
16. Classify the following reaction.
Ni(ClO4)2 (aq) + K2S (aq) 2 KClO4 (aq) + NiS (s)
a. decomposition
b. exchange
c. combustion
d. displacement
e. combination
