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CHEMISTRY 1604.
GENERAL CHEMISTRY
(INTESIVE)
PRACTICE
FINAL EXAM
- A 50.0-g sample of a metal is heated to 98.7 °C and then placed in a calorimeter containing
395.0 g of water ( c = 4.18 J/g·°C) at 22.5 °C. The final temperature of the water is 24.5 °C.
Which metal was used?
A) Aluminum ( C = 0.89 J/g·°C)
B) Iron ( C = 0.45 J/g·°C)
C) Copper ( C = 0.20 J/g·°C)
D) Lead ( C = 0.14 J/g·°C)
E) None of these
- One mole of a liquid is vaporized at^ its boiling point, 65 °C and 1.00 atm.^ H vap for the
liquid is 43.8 kJ/mol at 65 °C. Calculate w.
A) 27.7 J
B) – 27.7 J
C) – 2.81 10
3 J
D) 2.81 10
3
J
E) None of these
- Consider a process carried out on 1.00 mol of a monatomic ideal gas by the following two
different pathways. The first pathway is A (3.00 atm, 20.0 L) to C (1.00 atm, 20.0 L) to D
(1.00 atm, 50.0 L); and the second pathway is A (3.00 atm, 20.0 L) to B (3.00 atm, 50.0 L) to
D (1.00 atm, 50.0 L). In each case, the gas is taken from state A to state D. Calculate ∆HABD.
A) 225 L·atm
B) – 225 L·atm
C) – 25 L·atm
D) – 475 L·atm
E) 25 L·atm
- Using the following data, calculate the standard heat of formation of ICl( g ) in kJ/mol.
H ° (kJ/mol)
Cl 2 ( g ) 2Cl( g ) 242.
I 2 ( g ) 2I( g ) 151.
ICl( g ) I( g ) + Cl( g ) 211.
I 2 ( s ) I 2 ( g ) 62.
A) – 211 kJ/mol
B) – 14.6 kJ/mol
C) 16.8 kJ/mol
D) 245 kJ/mol
E) 439 kJ/mol
- Consider^ the^ reaction 2N 2 O 5 ( g )^ 4NO 2 ( g ) + O 2 ( g ) at 25°C, for which the following^ data
are relevant:
H °f (kJ/mol) (^) S ° (J/K•mol)
N 2 O 5 11.29 355.
NO 2 33.15 239.
O 2? 204.
Which of the following is true for this reaction?
A) Both H ° and S ° favor the reaction's spontaneity.
B) Both H ° and S ° oppose the reaction's spontaneity.
C) H ° favors the reaction, but S ° opposes it.
D) H ° opposes the reaction, but S ° favors it.
E) The reaction cannot occur at room temperature.
- For the process moleene( l ) moleene( g ) at 1 atm, H vap = 37.6 kJ/mol and S vap = 67.
J/mol·K. Assuming these values are independent of T , what is the normal boiling point of
moleene?
A) 828 °C
B) 282 °C
C) 378 °C
D) – 282 °C
E) 555 °C
- Given the following standard free energies of formation:
G°f (kJ/mol)
C 2 H 2 ( g ) 209.
C 2 H 6 ( g ) – 32.
calculate K p at 298 K for C 2 H 2 ( g ) + 2H 2 ( g ) C 2 H 6 ( g ).
A) 9.07 10
B) 97.
C) 1.24 10
31
D) 2.72 10
42
E) None of these is within a factor of 10 of the correct answer.
- Water gas, a commercial fuel, is made by the reaction of hot coke carbon with steam:
C( s ) + H 2 O( g ) CO( g ) + H 2 ( g )
When equilibrium is established at 800 °C, the concentrations of CO, H 2 , and H 2 O are 4.00
- 2 mol/L, 4.00 10 - 2 mol/L, and 1.00 10 - 2 mol/L, respectively. Calculate the value of
G ° for this reaction at 800 °C.
A) 109 kJ
B) – 43.5 kJ
C) 193 kJ
D) 16.3 kJ
E) none of these
- Calculate the de Broglie wavelength of an electron moving at a speed of 5.82x
6
cm s
.
A) 1.3x
nm
B) 0.13 nm
C) 1.3 nm
D) 13. nm
E) None of these
- Consider the photoelectric effect in nickel. When UV light of wavelength 131 nm impinges
upon a clean nickel surface in vacuum, electrons having a kinetic energy of
7.04 x 10
- 19 J are ejected from the surface. Calculate the longest wavelength of light that will
eject electrons from the surface of nickel.
A) 895 nm
B) 282 nm
C) 244 nm
D) 110 nm
E) none of these
- Which of the following atoms or ions is not paramagnetic?
A) Li
B) B
C) N
D) F
E) They are all paramagnetic
- Which of the following combinations of quantum numbers do represent permissible solutions
of the Schrodinger wave equation for the hydrogen atom?
n l ml ms
A) 3 0 1 - 1/
B) 2 2 0 +1/
C) 4 3 - 4 - 1/
D) 5 2 2 +1/
E) 3 2 - 2 - 3/
- For which of the following molecules or molecular ions does the central atom expected to
have sp
3 hybridization and tetrahedral geometry?
A) SF 4
B) CCl 4
C) ICl 4
D) XeF 4
E) all of these
- Which of the following must have a Lewis dot structure that violates the octet rule?
A) NO 2 B) SO 2 C) CO 2 D) all of these E) none of these
- Consider the best Lewis structures for carbonate ion (CO 3
2 - ), nitrate ion (NO 3
sulfur trioxide molecule (SO 3 ). Which of them can be best represented by two or more
resonance structures?
A) CO^3
2 -
B) NO^3
C) SO^3
D) CO^3
2 - and SO (^3)
E) CO 3
2 - , NO 3
- What is the formal charge on the nitrogen atom in the CNO- anion? The Lewis structure has
a triple CN bond and a single NO bond.
A) - 2
B) - 1
C) +
D) +
E) none of these
- Which of^ the^ following^ molecules^ or^ molecular^ ions^ is^ isoelectronic^ with^ N 2?
A) BF
B) NO
C) CN
-
D) all of these
E) none of these
- Which electronic configuration represents an excited state?
A) [He] 2 s
2 p
B) [Ne] 3 s
3 p
C) [Ar] 4 s
D) [Ne] 3 s
3 p
E) [He] 2s
2p
- According to molecular orbital theory, which of the following species is paramagnetic?
A) B 2
B) CN
C) O 2
D) All of these
E) None of these
- Which of the following molecular electron configurations yields a bond order of 2?
A) (1s)
2 (1s*)
1
B) (1s)
2
C) (1s)
2 (1s*)
2 (2s)
2 (2p*)
2
D) (1s)
2 (1s*)
2 (2s)
2 (2s*)
2 (2p*)
2
E) None of these
- Match the molecules (1,2,3) with their spectra (A,B,C) below?
A) A is 1; B is 2;C is 3
B) A is 1; B is 3;C is 2
C) A is 3; B is 1;C is 2
D) A is 3; B is 2;C is 1
E) A is 2; B is 3;C is 1
H
H
H C
C H
O
H
H
H
Br C C
Br C Br
Br H
H H
H H
C C
H C H
O
Molecule 1 C 2 H 4 O Molecule 2 C 3 H 4 Br 4 Molecule 3 C 3 H 6 O
Spectrum A
Molecule A Position, Structure of Relative
Chemical Peak Integral
Peaks Shift, ppm (Splitting) Value
1 9.8 quartet 1
2 2.2 doublet 3
10 8 6 4 2 0 PPM
Spectrum B
Molecule B
Peaks
Position,
Chemical Shift,
ppm
Structure of
Peak
(Splitting)
Relative
Integral
Value
1 2.2 singlet 1
(^3 ) PPM
1 0
Spectrum C
Molecule C Position, Structure of Relative
Chemical Shift, Peak Integral
Peaks ppm (Splitting) Value
1 3.2 triplet 1
2 6.0 triplet 1
7 6 5 4 3 2 1 0 PPM
- Water and oxygen are in the atmosphere and so potentially could contribute to the
greenhouse effect. Which of the following statements is correct?
A) Neither one has mid-IR absorption features, because of the molecular symmetries of
these species.
B) Only oxygen has strong mid-IR absorption features, because of the molecular symmetries
of these species.
C) Water, but not oxygen, has strong mid-IR absorption features, because of the molecular
symmetries of these species.
D) Both have only asymmetric stretch IR absorption features because of molecular
symmetry.
E) None of the above.
- The proton NMR spectrum of this compound is expected to give a single line
A) acetone,^ CH 3 COCH 3
B) CH 3 OD
C) Chloroform,^ CHCl 3
D) Methylene^ chloride,^ CH 2 Cl 2
E) All of the above
- Use the following initial rate data for the reaction in aqueous solution to determine the rate
law.
[Br 2
]
( M /s)
A) Rate^ =^ k[Br 2 ][H
]
B) Rate^ =^ k[CH 3 COCH 3 ][Br 2 ]
C) Rate^ =^ k[CH 3 COCH 3 ][H
]
D) Rate^ =^ k[CH 3 COCH 3 ][Br 2 ][H
]
E) Rate^ =^ k[CH 3 COCH 3 ][Br 2 ][H
]
2
- A first-order reaction is 43% complete at the end of 18 min. What is the value of the rate
constant?
A) 3.1 x 10
B) 0.21 min
C) 0.031 min
D) 4.7 10
-^2 min -^1
E) 1.4 10
[CH 3 COCH 3 ] 0 ( M ) [Br 2 ] 0 ( M ) [H
] 0 ( M ) t
