Exam - Faculty.utep.edu

130) Which of the following correctly gives the best coefficients for the reaction below
N2H4 + H2O2 ¬ N2 + H2O
A) 1, 1, 1 ,1 B) 1, 2, 1, 4 C) 2, 4, 2, 8 D) 1, 4, 1, 4 E) 2, 4, 2, 4
131) What coefficient is placed in front of O2 to complete the balancing of the following equation
C5H8 + O2 ¬ 5CO2 + 4H2O
A) 1 B) 3 C) 5 D) 7 E) 9
132) What is the coefficient of hydrogen, H2, when the following equation is balanced
Al + H2SO4 ¬ Al2(SO4) 3 + H2
A) 1 B) 2 C) 3 D) 4 E) 5
Pentane (C5H12) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) according to the following reaction. Answer
the next three questions about this reaction.
C5H12 + O2 ¬ CO2 + H2O
133) What is the coefficient for oxygen in the balanced equation
A) 2 B) 4 C) 5 D) 6 E) 8
134) What is the coefficient for carbon dioxide in the balanced equation
A) 2 B) 4 C) 5 D) 6 E) 8
135) What is the coefficient for water in the balanced equation
A) 2 B) 4 C) 5 D) 6 E) 8
136) The following reaction takes place when an electric current is passed through water. It is an example of a
_____ reaction.
2H2O electricity 2H2 + O2
A) combination
B) single replacement
C) combustion
D) decomposition
E) double replacement
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