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Old Exam 2 with Answer Key - Chemistry 1 - Introduction |, Exams of Chemistry

Albright CollegeChemistry

Material Type: Exam; Class: Chemistry 1 - Introduction; Subject: Chemistry; University: Albright College; Term: Forever 1989;

Typology: Exams

Pre 2010

Uploaded on 12/04/2009

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Chemistry 105B Exam II October 24, 2008
I certify I have not used a programming calculator for anything other than simple mathematical
operations.
_______________________________________ (Signature)
_______________________________________ (Printed name)
Multiple choice (3 pts. each) DARKEN THE CORRECT ANSWER ON THE ANSWER SHEET.
Remember there are also 4 problems given after the multiple-choice questions. Budget your time
accordingly.
1. Which of the following statements is(are) true concerning the First1 1L1a1w1 1o1f1
1T1h1e1r1m1o1d1y1n1a1m1i1c1s1?1
1a1)1 1E1n1e1r1g1y1 1i1s1 1c1o1n1s1e1r1v1e1d1.1
1b1)1 1M1a1t1t1e1r1 1i1s1 1c1o1n1s1e1r1v1e1d1.1
1c1)1 1T1h1e1 1e1n1e1r1g1y1 1l1o1s1t1 1b1y1 1t1h1e1 1s1y1s1t1e1m1 1m1u1s1t1 1b1e1
1g1a1i1n1e1d1 1b1y1 1t1h1e1 1s1u1r1r1o1u1n1d1i1n1g1s1.1
1d1)1 1a1 1a1n1d1 1c1
1e1)1 1a1l1l1 1o1f1 1t1h1e1 1a1b1o1v1e1
121.1 1W1h1i1c1h1 1o1f1 1t1h1e1 1f1o1l1l1o1w1i1n1g1 1h1a1s1 1a1 1DðH1f1o1 1o1f1 101
1k1J1/1m1o1l1 1a1t1 12151(1C1 1a1n1d1 1s1t1a1n1d1a1r1d1 1a1t1m1o1s1p1h1e1r1i1c1
1p1ressure?
a) Fe(l)
b) N2(g)
c) H2O(l)
d) NH3(g)
e) H(g)
3. The specific heat of aluminum is 0.90 EMBED Equation.DSMT4 µ §. How many joules of heat
would be required to raise the temperature of 4.6 g of aluminum from 22(C to 29(C?
a) 2.8 ( 10-2J b) 1.4 J
c) 36 J d) 29 J
4. When is (H approximately equal to (E?
When P(V is small.
When P(V is large.
When the pressure is constant.
d) When the pressure is large.
5. Suppose a process gave off 811 J of heat and did 37 J of work on the surroundings. What is the
change in internal energy associated with the process?
a) 774 J b) –848 J c) –774 J d) 848 J
6. Given the following information:
AgBr(s) + 1/2Cl2(g) ( AgCl(s) + 1/2Br2(l) (H = -27.6 kJ/mol
Which of the following statements concerning the reaction are true: (1) heat is released; (2) heat is
absorbed; (3) reaction is exothermic; (4) reaction is endothermic; (5) products have higher enthalpy
content than reactants; (6) reactants have higher enthalpy content than products.
pf3
pf4
pf5

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Download Old Exam 2 with Answer Key - Chemistry 1 - Introduction | and more Exams Chemistry in PDF only on Docsity!

Chemistry 105B Exam II October 24, 2008 I certify I have not used a programming calculator for anything other than simple mathematical operations. _______________________________________ (Signature) _______________________________________ (Printed name) Multiple choice (3 pts. each) DARKEN THE CORRECT ANSWER ON THE ANSWER SHEET. Remember there are also 4 problems given after the multiple-choice questions. Budget your time accordingly.

  1. Which of the following statements is(are) true concerning the First 1 1 L 1 a 1 w 1 1 o 1 f 1 1 T 1 h 1 e 1 r 1 m 1 o 1 d 1 y 1 n 1 a 1 m 1 i 1 c 1 s 1? 1 1 a 1 ) 1 1 E 1 n 1 e 1 r 1 g 1 y 1 1 i 1 s 1 1 c 1 o 1 n 1 s 1 e 1 r 1 v 1 e 1 d 1. 1 1 b 1 ) 1 1 M 1 a 1 t 1 t 1 e 1 r 1 1 i 1 s 1 1 c 1 o 1 n 1 s 1 e 1 r 1 v 1 e 1 d 1. 1 1 c 1 ) 1 1 T 1 h 1 e 1 1 e 1 n 1 e 1 r 1 g 1 y 1 1 l 1 o 1 s 1 t 1 1 b 1 y 1 1 t 1 h 1 e 1 1 s 1 y 1 s 1 t 1 e 1 m 1 1 m 1 u 1 s 1 t 1 1 b 1 e 1 1 g 1 a 1 i 1 n 1 e 1 d 1 1 b 1 y 1 1 t 1 h 1 e 1 1 s 1 u 1 r 1 r 1 o 1 u 1 n 1 d 1 i 1 n 1 g 1 s 1. 1 1 d 1 ) 1 1 a 1 1 a 1 n 1 d 1 1 c 1 1 e 1 ) 1 1 a 1 l 1 l 1 1 o 1 f 1 1 t 1 h 1 e 1 1 a 1 b 1 o 1 v 1 e 1
  2. 1 1 W 1 h 1 i 1 c 1 h 1 1 o 1 f 1 1 t 1 h 1 e 1 1 f 1 o 1 l 1 l 1 o 1 w 1 i 1 n 1 g 1 1 h 1 a 1 s 1 1 a 1 1 DðH 1 f 1 o 1 1 o 1 f 1 101 1 k 1 J 1 / 1 m 1 o 1 l 1 1 a 1 t 1 12151 ( 1 C 1 1 a 1 n 1 d 1 1 s 1 t 1 a 1 n 1 d 1 a 1 r 1 d 1 1 a 1 t 1 m 1 o 1 s 1 p 1 h 1 e 1 r 1 i 1 c 1 1 p 1 ressure? a) Fe(l) b) N2(g) c) H2O(l) d) NH3(g) e) H(g)
  3. The specific heat of aluminum is 0.90 EMBED Equation.DSMT4 μ §. How many joules of heat would be required to raise the temperature of 4.6 g of aluminum from 22(C to 29(C? a) 2.8 ( 10-2J b) 1.4 J c) 36 J d) 29 J
  4. When is (H approximately equal to (E? When P(V is small. When P(V is large. When the pressure is constant. d) When the pressure is large.
  5. Suppose a process gave off 811 J of heat and did 37 J of work on the surroundings. What is the change in internal energy associated with the process? a) 774 J b) –848 J c) –774 J d) 848 J
  6. Given the following information: AgBr(s) + 1/2Cl2(g) ( AgCl(s) + 1/2Br2(l) (H = -27.6 kJ/mol Which of the following statements concerning the reaction are true: (1) heat is released; (2) heat is absorbed; (3) reaction is exothermic; (4) reaction is endothermic; (5) products have higher enthalpy content than reactants; (6) reactants have higher enthalpy content than products.

a) 1, 3, and 5 b) 1, 3, and 6 c) 2, 4, and 6 d) 1 and 3 e) 2, 4, and 5

  1. The units of heat capacity are a) EMBED Equation.DSMT4 μ § b) EMBED Equation.DSMT4 μ § c) EMBED Equation.DSMT4 μ § d) EMBED Equation.DSMT4 μ § e) EMBED Equation.DSMT4 μ §
  2. Consider the following reactions and their associated values of 22222222222222222222222222222222222222222222222222222222222222222222222222222222 22222222222222222222222222222222222222222222222222222222222222222222222222222222 22222222222222222222222222222222222222222 DðH 2 ° 2. 2 2 2 222 C 222 H 262 2 ( 2 g 2 ) 2 2 + 2 272 O 222 ( 2 g 2 ) 2 2 ®ð ð4 2 C 2 O 222 ( 2 g 2 ) 2 2 + 2 262 H 222 O 2 ( 2 l 2 ) 2 2 DðH 2 ° 2 2 = 2 2 - 232122232 2 k 2 J 2 2 2 222 C 222 H 222 2 ( 2 g 2 ) 2 2 + 2 252 O 222 ( 2 g 2 ) 2 2 ®ð ð4 2 C 2 O 222 ( 2 g 2 ) 2 2 + 2 222 H 222 O 2 ( 2 l 2 ) 2 2 DðH 2 ° 2 2 = 2 2 - 222620222 2 k 2 J 2 2 H 222 ( 2 g 2 ) 2 2 + 2 212 / 222 O 222 ( 2 g 2 ) 2 2 ( 2 2 H 222 O 2 ( 2 l 2 ) 2 2 ( 2 H 2 ( 2 2 = 2 2 - 2228262 2 k 2 J 2 2 2 2 2 2 2 2 W 2 h 2 a 2 t 2 2 i 2 s 2 2 t 2 h 2 e 2 2 v 2 a 2 l 2 u 2 e 2 2 o 2 f 2 2 DðH 2 ° 2 2 f 2 o 2 r 2 2 t 2 h 2 e 2 2 e 2 q 2 u 2 a 2 t 2 i 2 o 2 n 2 2 s 2 h 2 o 2 w 2 n 2 2 b 2 e 2 l 2 o 2 w 2? 2 2 2 2 C 222 H 222 ( 2 g 2 ) 2 2 + 2 222 H 222 2 ( 2 g 2 ) 2 2 ®ð 2 C 222 H 262 ( 2 g 2 ) 2 2 2 2 2 a 2 ) 2 22232 5 kJ b) -25.5 kJ c) –311.5 kJ d) 311.5 kJ
  3. Passing an electrical current through argon gas contained in a partially evacuated vessel yields which of the following. a continuous spectrum white light a line spectrum d) no visible change e) (a) and (b)
  4. What is the wavelength (in nm) of electromagnetic radiation emitted by an electronic transition from n=5 to n=2 in a hydrogen atom? (RH = 2.18 x 10-18 J, c = 3.0 x 108 m/s, h = 6.63 x 10-34J · s.) a) 304 nm b) 3.6 nm c) 23 nm d) 434 nm
  5. In iron, which of the following electrons, characterized by the four quantum numbers, has the lowest energy? a) n = 3, l = 2, ml = 0, ms = + EMBED Equation.3 μ § b) n = 3, l = 2, ml = 1, ms = - EMBED Equation.3 μ § c) n = 3, l = 1, ml = 0, ms = + EMBED Equation.3 μ § d) n = 4, l = 0, ml = 0, ms = + EMBED Equation.3 μ §
  6. Which of these orbitals is possible when l = 2? a)1 b) 2 & 3 c) 1, 2, & 3 d) 4 & 5 e) all of the above
  7. How many electrons in an atom can possess an n = 3 principal quantum number?

larger, smaller smaller, larger smaller, smaller d) larger, larger

  1. Determine which of the following isoelectronic series is arranged in order of increasing size. Ca, K, Cl, S, P N3-, O2-, F-, Na+, Mg+ P3-, S2-, Cl-, K+, Ca2+ Mg2+, Na+, F-, O2-, N3-
    1. Which one of the elements below has the largest effective nuclear charge (Zeff)? a) Zn b) Ga c) Ca d) Cr e) Br
  2. The first periodic chart was organized in order of increasing ____________. a) atomic number b) atomic weight c) effective nuclear charge d) size YOU MUST SHOW YOUR WORK ON THE ANSWER SHEET FOR THE FOLLOWING PROBLEMS
    1. (8 pts.) What is the standard enthalpy of formation of NO(g) given that the enthalpy of formation of NO2(g) is 32 kJ/mol and the enthalpy of reaction for 2NO(g) + O2(g) ( 2NO2(g) is -116 kJ at standard state conditions.
    2. (10 pts.) 50.0 ml of 0.95 M HCl is added to 50.0 ml of 0.95 M KOH in a "coffee cup" calorimeter and stirred. A change in temperature is observed from 26.0(C to 32.6(C. What is the heat of reaction per mole of HCl? Assume the specific heat of the solution is the same as that of pure water ( 4.18 J/g((C), the density of each solution is 1g/ml, and that no heat is lost to the "coffee cup" and surroundings.
  3. (10 pts.) Write the electron configurations for the ground states of Ni and Sn using longhand notation. Label both the core electrons and the valence electrons. How many unpaired electrons are present?
  4. (9 pts.) Explain what is meant by degeneracy in atomic orbital theory. Provide an example along with your definition.

ANSWER KEY

  1. d
  2. b