Chemistry and Society Final Exam
A compound that speeds up the rate of a chemical reaction without being used up itself is a(n) A) catalyst. B) oxidizing agent. C) reducing agent. D) antioxidant.
A
A cyclic hydrocarbon containing seven carbon atoms and two double bonds will have the formula A) C7H10. B) C7H16. C) C7H12. D) C7H14.
A
A device that generates an electrical current by taking advantage of a difference in the spontaneous tendency of substances to lose and gain electrons is called an A) electrochemical cell. B) electroplating cell. C) electrolyte cell. D) electrolysis cell.
A
A substance undergoing oxidation will A) lose electrons. B) gain hydrogen. C) lose oxygen. D) gain electrons
A
Aluminum is more reactive than iron is, but iron corrodes more quickly. This occurs because A) aluminum develops a coating of aluminum oxide, which protects it from further reaction. B) iron is exposed to both oxygen and water, while aluminum is rarely exposed to water. C) aluminum is reduced in the presence of oxygen while iron is oxidized. D) iron has a lower density than aluminum does.
A
Approximately what percentage of the earth's crust is composed of oxygen? 39) A) around 50% B) around 75% C) around 10% D) around 25%
A
The only natural process that produces oxygen is A) photosynthesis. B) catalysis. C) electrochemical cells. D) rainfall.
A
The oxidation number for Cl in Cl2 is A) 0. B) -2. C) +1. D) -1.
A
This substance is a powerful oxidizing agent and a harmful pollutant; yet a layer of it in the upper stratosphere serves as a shield from harmful ultraviolet radiation from the sun. A) O3 (ozone) B) SO3 C) O2 D) CO2
A
What is reduced in the following reaction? 2 Bi3+ + 3 Mg -> 2 Bi + 3 Mg2+ A) Bi3+ B) Mg C) Bi D) Mg2+
A
A battery in which a fuel is oxidized at the anode and oxygen is reduced at the cathode is a(n) A) lithium battery. B) fuel cell. C) alkaline battery. D) lead storage battery.
B
Antioxidants are A) water soluble. B) reducing agents found in foods. C) oxidizing agents found in foods. D) fat-soluble.
B
Human cells obtain energy by A) absorbing sunlight. B) oxidizing carbohydrates. C) reducing proteins. D) reducing carbon dioxide.
B
The most abundant element (by mass) in the human body is A) nitrogen. B) oxygen. C) water. D) carbon
B
When metals react with oxygen, they form A) metalloids. B) oxides. C) new elements. D) halides
B
With respect to volume, approximately what percentage of the air we breathe is composed of elemental nitrogen? 34) A) around 20% B) around 80% C) around 50% D) around 10%
B
ANFO is an explosive mixture of ammonium nitrate, NH4NO3, and fuel oil. When this mixture explodes, the ammonium nitrate undergoes A) oxidation. B) reduction. C) both oxidation and reduction. D) neither oxidation nor reduction.
C
Antiseptics are substances that A) are the same as anesthetics. B) relieve inflammation. C) kill microorganisms. D) are pain killers.
C
When hydrogen is added to a compound, which of the following can act as a catalyst? A) O B) N C) Pt D) C
C
An electrochemical cell is a device that converts chemical energy into A) light energy. B) nuclear energy. C) chemical energy. D) electrical energy.
D