Chemistry Exam Green
CHEM 188 – Spring, 2013
Hour Exam 1 (Red)
February 14, 2011
Instructions:
Your scantron answer sheet must show your NAME, 7-DIGIT KU ID NUMBER, and LAB SECTION. (Begin these entries at the LEFT end of the space provided.)
In answering the questions, be careful to fill in the corresponding circles on the answer sheet according to the number of the question on the exam. USE A SOFT (No. 2) PENCIL.
((((((((((((((((((((((((((((((((((((((
Useful information:
Gas constant, R = 8.314 J/K ( mol
= 0.08206 L ( atm/K ( mol
Integrated Rate Laws:
[pic] Arrhenius equation: [pic]
[pic]
Relation of KP to KC: KP = KC(RT)(n
Quadratic formula: [pic]
1. Consider the reaction
4PH3(g) ( P4(g) + 6H2(g).
Suppose that, at a particular moment during the reaction, H2(g) is being formed at the rate of 0.624M/s. At what rate is P4(g) being formed?
A. 0.013 M/s B. 0.026 M/s C. 0.052 M/s D. 0.104 M/s E. 0.624 M/s
2. Consider the hypothetical reaction A + 2B ( products. Use the following data to determine the rate constant, k, for the reaction.
Expt. # [A]0 [B]0 Initial rate 1 0.20 0.20 2.19 M/min 2 0.20 0.40 2.19 M/min 3 0.40 0.20 4.38 M/min
A. 3.8 min-1 B. 7.3 min-1 C. 11 min-1 D. 22 min-1 E. 26 min-1
3. If concentration is expressed in units of molecules per cubic centimeter (molec/cm3) and time in units of seconds (s), the units of a zero-order rate constant are
A. molec cm( 3 s( 1 B. cm6 molec( 2 s( 1 C. s ( 1
D. s ( 2 E. cm3 molec( 1 s( 1
4. The chemical reaction A ( products is known to have a rate law of the general type
rate = k[A]n.
A plot of [A] versus time was found to give a straight line with a negative slope. What is n, the order of reaction?
A. zero B. first C. second D. third E.
Hour Exam 1 (Red)
February 14, 2011
Instructions:
Your scantron answer sheet must show your NAME, 7-DIGIT KU ID NUMBER, and LAB SECTION. (Begin these entries at the LEFT end of the space provided.)
In answering the questions, be careful to fill in the corresponding circles on the answer sheet according to the number of the question on the exam. USE A SOFT (No. 2) PENCIL.
((((((((((((((((((((((((((((((((((((((
Useful information:
Gas constant, R = 8.314 J/K ( mol
= 0.08206 L ( atm/K ( mol
Integrated Rate Laws:
[pic] Arrhenius equation: [pic]
[pic]
Relation of KP to KC: KP = KC(RT)(n
Quadratic formula: [pic]
1. Consider the reaction
4PH3(g) ( P4(g) + 6H2(g).
Suppose that, at a particular moment during the reaction, H2(g) is being formed at the rate of 0.624M/s. At what rate is P4(g) being formed?
A. 0.013 M/s B. 0.026 M/s C. 0.052 M/s D. 0.104 M/s E. 0.624 M/s
2. Consider the hypothetical reaction A + 2B ( products. Use the following data to determine the rate constant, k, for the reaction.
Expt. # [A]0 [B]0 Initial rate 1 0.20 0.20 2.19 M/min 2 0.20 0.40 2.19 M/min 3 0.40 0.20 4.38 M/min
A. 3.8 min-1 B. 7.3 min-1 C. 11 min-1 D. 22 min-1 E. 26 min-1
3. If concentration is expressed in units of molecules per cubic centimeter (molec/cm3) and time in units of seconds (s), the units of a zero-order rate constant are
A. molec cm( 3 s( 1 B. cm6 molec( 2 s( 1 C. s ( 1
D. s ( 2 E. cm3 molec( 1 s( 1
4. The chemical reaction A ( products is known to have a rate law of the general type
rate = k[A]n.
A plot of [A] versus time was found to give a straight line with a negative slope. What is n, the order of reaction?
A. zero B. first C. second D. third E.