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Final Exam Fall 2007, Exams of Chemistry

City University of New York (CUNY) - Kingsborough Community CollegeChemistry

20 multiple-choice questions without solution manual.

Typology: Exams

Pre 2010

Uploaded on 02/11/2022

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General Chemistry I (CHM 11) Final Exam
Fall 2007 Section D01BG
Part 1: Answer all 20 multiple-choice questions. 3.5 points each, 70 points in total.
1. How many centimeters are in 2.45 feet? (2.54 cm/inch, 12 inches/foot)
a. 6.22 b. 0.518 c. 29.4 d. 74.7 e. 11.6
2. The number of significant figures in the answer to the following calculation is___.
12.011 g – 11.11 g + 2.412 g =
a. 1 b. 2 c. 3 d. 4 e. 5
3. Write the chemical formula for the compound formed from Cr3+ and SO4
2–- ions.
a. Cr3SO4 b. Cr3(SO4)2 c. Cr3SO4 d. Cr2(SO4)3
e. Cr2(SO4)2
4. Consider the balanced equation: 2CH4 + 4O2 Æ 2CO2 + 4H2O
If 2.50 mol of each reactant is mixed together, how many moles of CO2 will be produced?
a. 2.50 b. 5.00 c. 1.25 d. 4.00 e. 2.00
5. How many carbon atoms are in 115.00 g of glucose, C6H12O6?
a. 115 b. 6.02 x 1023 c. 0.638 d. 3.84 x 1023 e. 2.30 x 1024
6. In the reaction, K2SO4(aq) + Ba(NO3)2(aq) → BaSO4(s) + 2 KNO3(aq), which ions are the
spectator ions?
a. Ba2+ and SO4
2- b. Ba2+ and K+
c. Ba2+ and NO3
- d. K+ and SO4
2-
e. K+ and NO3
-
7. 66.7 mL of 18.0 molar sulfuric acid solution was dissolved in enough water to make 500 mL of
solution. The molarity of the diluted mixture is
a. 2.40 molar b. 0.135 molar
c. 36.0 molar d. 9.00 molar
e. 0.00741 molar
8. Which of these equations does not represent an oxidation-reduction reaction?
a. 3Al + 6HCl → 3H2 + AlCl3
b. 2H2O → 2H2 + O2
c. 2NaCl + Pb(NO3)2 → PbCl2 + 3NaNO3
d. 2NaI + Br2 → 2NaBr + I2
e. Cu(NO3)2 + Zn → Zn(NO3)2 + Cu
9. A 500.0 gram sample of aluminum is initially at 25.0 oC. It absorbs 32.60 kJ of heat from its
surroundings. What is its final temperature, in oC? (specific heat = 0.9930 J g-1 oC-1 for
aluminum)
a. 40.4
oC b. 64.7 oC c. 65.7 oC d. 89.7 oC
e. 90.7
oC
pf3
pf4

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General Chemistry I (CHM 11) Final Exam

Fall 2007 Section D01BG

Part 1: Answer all 20 multiple-choice questions. 3.5 points each, 70 points in total.

  1. How many centimeters are in 2.45 feet? (2.54 cm/inch, 12 inches/foot) a. 6.22 b. 0.518 c. 29.4 d. 74.7 e. 11.
  2. The number of significant figures in the answer to the following calculation is___. 12.011 g – 11.11 g + 2.412 g =

a. 1 b. 2 c. 3 d. 4 e. 5

  1. Write the chemical formula for the compound formed from Cr 3+^ and SO 4 2–-^ ions. a. Cr 3 SO 4 b. Cr 3 (SO 4 ) 2 c. Cr 3 SO 4 d. Cr 2 (SO 4 ) 3 e. Cr 2 (SO 4 ) (^2)
  2. Consider the balanced equation: 2CH 4 + 4O 2 Æ 2CO 2 + 4H 2 O If 2.50 mol of each reactant is mixed together, how many moles of CO 2 will be produced? a. 2.50 b. 5.00 c. 1.25 d. 4.00 e. 2.
  3. How many carbon atoms are in 115.00 g of glucose, C 6 H 12 O 6? a. 115 b. 6.02 x 10^23 c. 0.638 d. 3.84 x 10^23 e. 2.30 x 10 24
  4. In the reaction, K 2 SO 4 ( aq ) + Ba(NO 3 ) 2 ( aq ) → BaSO 4 ( s ) + 2 KNO 3 ( aq ), which ions are the spectator ions? a. Ba2+^ and SO 4 2-^ b. Ba2+^ and K+ c. Ba2+^ and NO 3 -^ d. K+^ and SO 4 2- e. K+^ and NO 3 -
  5. 66.7 mL of 18.0 molar sulfuric acid solution was dissolved in enough water to make 500 mL of solution. The molarity of the diluted mixture is a. 2.40 molar b. 0.135 molar c. 36.0 molar d. 9.00 molar e. 0.00741 molar
  6. Which of these equations does not represent an oxidation-reduction reaction? a. 3Al + 6HCl → 3H 2 + AlCl (^3) b. 2H 2 O → 2H 2 + O 2 c. 2NaCl + Pb(NO 3 ) 2 → PbCl 2 + 3NaNO 3 d. 2NaI + Br 2 → 2NaBr + I (^2) e. Cu(NO 3 ) 2 + Zn → Zn(NO 3 ) 2 + Cu
  7. A 500.0 gram sample of aluminum is initially at 25.0 o^ C. It absorbs 32.60 kJ of heat from its surroundings. What is its final temperature, in o^ C? (specific heat = 0.9930 J g-1^ oC-1^ for aluminum) a. 40.4 o^ C b. 64.7 o^ C c. 65.7 o^ C d. 89.7 o^ C e. 90.7 o^ C
  1. According to the kinetic theory of gases, the average kinetic energy of the gas particles in a gas sample is directly proportional to the a. pressure b. Volume c. Temperature d. molar mass e. number of moles of gas
  2. What is the wavelength of electromagnetic radiation which has a frequency of 4.464 x 10^14 s-1^? a. 1.338 x 10^23 m b. 1.489 x 10 -6^ m c. 6.716 x 10-7^ nm d. 671.6 nm e. 7.472 x 10-15^ nm
  3. What is the wavelength, in nm, of radiation which has an energy of 3.371 x 10-19^ joules per photon? a. 655.9 nm b. 152.5 nm c. 170.0 nm d. 589.3 nm e. 745.1 nm
  4. Given the following sets of quantum numbers for n l ml ms , which one of these sets is not a possible set for an electron in an atom?

n l ml m (^) s a. 3 2 2 -½ b. 3 1 -1 ½ c. 4 3 2 ½ d. 4 3 -2 -½ e. 5 2 3 ½

  1. The atoms in the oxygen molecule, O 2 , are held together by a. a single covalent bond b. a double covalent bond c. a triple covalent bond d. an ionic bond e. a magnetic dipole bond
  2. Based on the position in the periodic table, which one of the following atoms would you expect to be the most electronegative? a. Cl b. Ge c. P d. Se e. Sn
  3. Indicate the type of hybrid orbitals used by the central atom in PCl 3. a. sp b. sp^2 c. sp^3 d. sp^3 d e. sp^3 d^2
  4. Which one of the following substances will have both dispersion forces and dipole-dipole forces? a. HCl b. BCl 3 c. Br 2 d. H 2 e. CO 2
  5. According to VSEPR theory, which one of the following molecules should be nonlinear? a. CO 2 b. C 2 H 2 c. SO 2 d. BeCl 2 e. KrF (^2)
  6. Calculate the molality of a solution containing 14.3 g of NaCl in 42.2 g of water. a. 2.45 × 10 -4^ m b. 5.80 × 10-4^ m c. 2.45 × 10 -1^ m d. 103 m e. 5.80 m

2ClF (g) + O 2 (g) Æ Cl 2 O (g) + F 2 O (g) ∆H°rxn = 167.4 kJ/mol 2ClF 3 (g) + 2O 2 (g) Æ Cl 2 O (g) + 3F 2 O (g) ∆H°rxn = 341.4 kJ/mol 2F 2 (g) + O 2 (g) Æ 2F 2 O (g) ∆H°rxn = -43.4 kJ/mol At the same temperature, use Hess’ law to calculate ∆H° (^) rxn for the following reaction:

ClF (g) + F 2 (g) Æ ClF 3 (g)

  1. What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100 g of benzene by 0.47°C? Kf of benzene is 5.12°C/m.
  2. This is not a multiple-choice question, answer all of parts:
    1. According to the VSEPR theory, the geometrical structure of PF 5 is _________
      1. Draw a Lewis structure for PF 5 that shows the correct atomic arrangement.______
      2. PF 5 is (polar; nonpolar). (Circle one)