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Which of these synthetic polymers is most closely related to the natural protein polymers? A. polyester B. nylon C. polystyrene D. polyvinyl chloride How are HDPE and LDPE different? A. Only one is a member of the “Big Six.” B. […]

Which of the following statements is true? A. Over-the-counter (OTC) drugs are not screened by the FDA. B. More than 700 OTC products were once only available by prescription. C. Drug manufacturers are against switching a prescription drug to OTC […]

CFCs were originally developed to replace which refrigerant compound(s)? A. ice B. HCFCs C. ammonia and sulfur dioxide D. propane Which would be classified as a ‘synthetic” polymer? A. cellulose B. wool C. rubber D. nylon Answer: D Which form […]

Thermal pollution is possible at water sources near 5-21-2013 A. coal-burning plants. B. nuclear plants. C. both coal-burning and nuclear plants. D. neither coal-burning nor nuclear plants. Which compound cannot exist as a pair of optical isomers? A. B. C. […]

Which functional group does this molecule contain? A. acid B. alcohol C. amine D. ester The “ozone layer” is found A. only around the equator. B. in the troposphere. C. in the stratosphere. D. in the mesosphere. Answer: C Calculate […]

Looking at the data in this chart, which observations are correct? I. The percentage of the population that are undernourished in developing countries has fallen steadily since 1969. II. The largest decline in undernourished population was in Asia and the […]

Which substances are regulated by the Kyoto Protocol? I. argon II. carbon dioxide III. nitrogen IV. nitrous oxide V. sulfur hexafluoride A. I, II, and III only B. I and III only C. II, IV, and V only D. II […]

Which is the cathode in this galvanic cell? A. the solid zinc electrode B. the Zn2+(aq) ions in the 1 M solution C. the solid silver electrode D. the Ag+(aq) ions in the 1 M solution A substance that can […]

Which functional groups are present in all amino acids? A. amine ( NH2) groups only B. acid ( COOH) groups only C. amine and acid groups D. single and double bonds between carbon atoms Which concentration is consistent with a […]

What is vitrification? A. Spent fuel elements or other mixed waste are encased in ceramic or glass. B. Spent fuel elements or other mixed waste are shot into space. C. Spent fuel elements or other mixed waste are buried beneath […]

Which of the following is a pure substance? A. Lemonade B. Concrete C. Gasoline D. Silver wire Morphine, opium and oxycodone are categorized into which”drug schedule”? A. I B. II C. III D. IV Answer: B Which of the following […]

Polyvinyl chloride (PVC) is used in A. water bottles. B. CD cases. C. milk cartons. D. plumbing pipe. There are approximately 2 x 1022 molecules and atoms in each breath we take and the concentration of CO in the air […]

Which does not contribute to your annual radiation dose? A. the type of structure you live in B. the amount of time you spend riding in jet planes C. the number of dental X-rays you get each year D. the […]

How many atoms are present in 0.375 mol of palladium (Pd) atoms? A. 1.61 1024 B. 6.02 1023 C. 2.26 1023 D. 2.12 1021 Which compound is insoluble in water? A. sodium carbonate B. potassium nitrate C. ammonium chloride D. […]

Semiconductors are more effective than metals as converters of solar radiation into electricity because A. it is easier for the atoms of a semiconductor to absorb solar energy and to move from place to place within the solid, thereby conducting […]

According to the graph below, the net United States import of petroleum drastically decreased during the years A. 1970 to 1977. B. 1973 to 1975. C. 1977 to 1982. D. 1985 to 1990. The primary structure of a protein is […]

DNA has four different nitrogen-containing bases. Which of the following are other structural characteristics of DNA? I. The bases are attached to the phosphate groups. II. The bases are attached to the sugar molecule, deoxyribose. III. The bases A and […]

Why are many drugs administered as salts rather than as the corresponding neutral compounds? A. Salts have greater water solubility and stability than the neutral compound. B. As a general rule, salts are more active than the neutral compounds. C. […]

Which symbol(s) represent(s) elements in the noble gas family? A. X and Z B. P and L C. Q D. Y The Montreal protocol is a A. treaty to protect against global warming. B. treaty to reduce the amount of […]

Numbers 1 through 4 are used to identify four different elements. Based on periodic table trends, which number identifies the element that is expected to have the greatest tendency to attract a shared pair of electrons? A. 1 B. 2 […]

Which is not a pure substance? A. helium B. copper wire C. air D. sucrose Which of these statements about biodiesel is not true? A. Biodiesel is made from renewable resources such as vegetable oils and animal fats. B. Biodiesel […]

HCFCs have been developed to replace CFCs as refrigerants. Which property of these new compounds makes them environmentally superior to CFCs? A. Greater reactivity leads to decomposition at elevations below the stratospheric ozone concentration maximum. B. Lower reactivity makes them […]

Why is the mileage a vehicle gets less when burning E85 than 100% gasoline? A. It is not, they are the same. B. It is not, E85 gives better mileage per gallon burned. C. Ethanol has a lower heat of […]

In this molecule four different functional groups are circled. Which is the carboxylic acid functional group? A. I B. II C. III D. IV Which equation below shows the addition polymerization of ethylene? A. B. C. D. Answer: C Arrange […]

The ________ concentration in the air over the desert differs dramatically from that in the air in the tropical rainforest. A. N2 B. O2 C. CO2 D. H2O Identify possible consequences of global warming. I. A rise in sea level […]

Although greenhouse gases likely account for the problem of global warming, they are also responsible for making earth habitable. What would be the temperature on earth in the absence of the effects of carbon dioxide and water? A. 450C B. […]

Which country has the highest per capita emission of carbon dioxide? A. United States B. Germany C. Canada D. Saudi Arabia How many bromide ions can combine with one ion of aluminum to form an ionic compound? A. 3 B. […]

The MCL for drinking water is the legal limit for the concentration of a contaminant expressed in ppm or ppb. This is always a lower concentration than the MCLG value for the same contaminant. True False The MCL for drinking […]

The speed of light in air A. depends only on the frequency of the light. B. depends only on the wavelength of light. C. is independent of the wavelength and frequency of light. D. depends on both the wavelength and […]

A substance that can be broken down into two or more simpler substances by chemical methods is called a(n) A. compound. B. mixture. C. element. D. isotope. Which of these locations would be best suited to geothermal energy as a […]

Which bond represents the “peptide” bond? A. I B. II C. III D. IV The fact that carbon (C) is less electronegative than nitrogen (N) means that in a C N bond, the A. shared electrons are closer to the […]

Which of the following is a proper use for a calorimeter? A. Measuring heat of combustion B. Measuring temperature of a mixture C. Measuring the amount of oxygen consumed in a combustion reaction D. Measuring entropy of a reaction This […]

Which of the following is most biologically damaging type of radiation? A. UV-A B. UV-B C. UV-C D. Infrared The two main products of the combustion of gasoline in an automobile engine are A. oxygen and carbon monoxide. B. sulfur […]

Superglue is made from this monomer, cyanoacrylate. Which is a representation of the head-to-tail to head-to-tail arrangement of the polymer? A. B. C. D. Which compound has a correct formula? A. CaSO3 B. Ca2SO4 C. Mg(CO3)2 D. Na2PO4 Answer: C […]

Based on this graph, which group of economies is predicted to have the largest energy consumption in2025? A. Mature market economies B. Emerging economies C. Transitional economies D. No way to know Use the equation to help you calculate the […]

Which statement is not true? A. In forming a solution, the solute dissolves other substances that are called solvents. B. Water is the solvent in an aqueous solution. C. Pure water does not conduct electricity. D. Electrolytes dissolved in water […]

Which shows the Lewis structure of water with the correct partial charges and nonbonding electrons? A. B. C. D. How many bromide ions can combine with one ion of aluminum to form an ionic compound? A. 3 B. 6 C. […]

Consider these three compounds. Which are isomers? A. I and II only B. I and III only C. II and III only D. I, II, and III Yellow light has a wavelength of 580 nm. What is the frequency of […]

Which is not a component of a fuel cell? A. a timer B. an anode C. a cathode D. an electrolyte Which is the balanced chemical equation showing hydrogen peroxide (H2O2) decomposing into hydrogen (H2) and oxygen (O2)? A. H2O2 […]

Most polyatomic ions A. have a negative charge. B. are composed of a total of two atoms. C. are cations. D. contain sulfur atoms. Increasing wavelength of light goes in this order: A. ultraviolet > visible > infrared. B. visible […]

Which is not true concerning the discovery and development of the penicillin antibiotics? A. Alexander Fleming noted that the mold Penicillium notatum inhibited bacterial growth. B. The first step in the development of these drugs was the isolation of the […]

How do the interactions that are broken in water when it is boiled compare with those broken when water is electrolyzed? A. Boiling water breaks intermolecular attractions and electrolysis breaks covalent bonds. B. Boiling water breaks covalent bonds and electrolysis […]

Which is an advantage of using coal over petroleum as a source of energy in the United States? A. As a solid, coal is easier to transport than a liquid such as petroleum. B. Carbon makes up a smaller proportion […]