Chemistry Exam 3

A battery is a device that converts chemical energy into A) electrical energy B) chemical energy C) nuclear energy D) light energy

A

A bottle of an alcoholic beverage is labelled as ʺ60 proof.ʺ The percentage of ethanol by volume in this alcoholic beverage is A) 30% B) 15% C) 60% D) 20%

A

A major advantage of lead storage batteries is that they are A) rechargeable B) disposable C) lightweight D) all of the above

A

All of the following are known to be forms of ionizing radiation EXCEPT A) radio waves B) gamma rays C) X-rays D) ultraviolet radiation

A

Aspartame is a(n) A) artificial sweetener B) vitamin C) monosaccharide D) protein

A

Carbon-11 is used in medical imaging. The half-life of this radioisotope is 20.4 min. What percentage of a sample remains after 70.0 min? A) 9.27 B) 74.7 C) 29.1 D) 3.23 E) 3.43

A

Cosmic rays are A) high energy radiation produced by the sun B) high energy radiation produced in the ozone layer C) high energy radiation produced by the earthʹs core D) none of these

A

Fats are A) esters B) amides C) glycerols D) aldehydes

A

High-density lipoprotein is often called ʺgood cholesterolʺ because it A) transports cholesterol to the liver where it is processed and excreted B) carries cholesterol to the lungs where it is oxidized C) delivers cholesterol to the cells for use D) breaks down cholesterol in the bloodstream

A

If no additives were added to our food supply, which of the following would be most likely to occur? A) increased food spoilage, which could lead to a major reduction of the worldʹs food supply B) decreased food costs C) increased food nutrition D) fewer cases of food poisoning

A

In nuclear fusion, A) smaller, relatively stable, nuclei are forced together to create a larger nucleus with the release of binding energy B) large, relatively unstable, nuclei are split releasing binding energy C) small, relatively stable, nuclei are split releasing binding energy D) large unstable nuclei are fused together, and then split with the release of binding energy

A

In the photosynthesis reaction: 6 CO2 + 6 H2O → C6H12O6 + 6 O2, the substance that serves as the reducing agent is A) water B) carbon dioxide C) glucose, C6H12O6 D) sunlight

A

In the reaction N2 + 3 H2 → 2 NH3, nitrogenis A) an oxidizing agent B) a product C) a catalyst D) a reducing agent

A

LDPE finds applications as A) food wrap B) drain pipes C) rigid containers D) television cabinets

A

Low-density polyethylene is composed of A) primarily highly branched, non-linear chains of polyethylene in a diffuse packing arrangement B) a mixture of polyethylene and polystyrene C) polyethylene with low density plasticizers added to increase density D) primarily linear, unbranched chains of polyethylene in a close packing arrangement

A

Most household bleaches act as A) oxidizing agents B) proton donors C) reducing agents D) electron donors

A

Natural rubber can be made from the monomer A) isoprene B) propylene C) ethylene D) butadiene

A

Organic compounds that contain a benzene ring or possess certain properties similar to those of benzene are called ________ compounds. A) aromatic B) saturated C) alkaloid D) acidic

A

Persons with lactose intolerance A) lack the enzyme for the breakdown of lactose B) have a bitter taste response to lactose C) have a deficiency of lactose D) are allergic to lactose

A

Proteins are polymers of A) amino acids B) glucose C) maltose D) fructose

A

Technetium-99m is a radioisotope used in a variety of diagnostic tests. Technetium-99m has a short half-life (6 hr). The advantage of a short half-life for diagnostic purposes is A) the radioactivity does not linger in the body B) the chemical reactions induced by the technetium are more rapid C) the radioactivity is easier to monitor D) the radioactivity lasts for a long time.

A

The amount of a radioactive isotope that remains after two half-lives have passed is A) 25% B) 75% C) 98% D) 50%

A

The body stores most excess glucose as A) fat B) protein C) cellulose D) glycogen

A

The compound below is a(n) (REFER TO QUESTION 39) A) aldehyde B) ketone C) alcohol D) carboxylic acid

A

The half-life of cobalt-60 is 5.20 yr. How many milligrams of a 2.000-mg sample remains after 6.55 years? A) 0.837 B) 1.163 C) 1.588 D) 4.779 E) 3.23 × 10-15

A

The hydrocarbon that is used in torches along with oxygen to produce very hot flames for cutting and welding is A) acetylene B) methane C) propane D) ethylene

A

The intoxicating alcohol in ʺalcoholicʺ beverages is A) ethanol B) propanol C) methanol D) a mixture of the above

A

The monomer used to make Teflon is A) F2C=CF2 B) Cl2C=CH2 C) H2C=CH2 D) H2C=CHCl

A

The number of different amino acids that combine to form human protein is generally recognized as A) 20 B) 45 C) 10 D) 35

A

The yellow-orange color of carrots is due primarily to A) β-carotene B) FD&C yellow C) BHA D) chlorophyll

A

There is some evidence that exercise increases A) HDL B) VLDL C) LDL D) all lipoproteins

A

This formula in which n can be a very large number represents which of the following polymers? (REFER TO QUESTION 52) A) polyvinyl chloride B) teflon C) polypropylene D) polyethylene

A

Thorium-234 undergoes beta decay: 234/90 Th → 0/1e + Q What is Q? A) 234 91 Pa B) 233 90 Th C) 234 89 Ac D) 233 91 Th

A

Vulcanization of rubber was discovered by A) Charles Goodyear B) Charles Firestone C) Charles Vulcan D) Charles Goodrich

A

What is the name of the compound with a formula CH3CH2CH3? A) propane B) ethane C) methane D) butane

A

What proportion of the human body is water? A) ≈ 2/3 B) ≈ 1/2 C) ≈1/4 D) ≈ 1/10

A

When your car rusts, the major chemical reaction is that between the iron from the steel in the car body with the oxygen from the air to form iron(III) oxide. When the reaction is balanced, the coefficient of iron is A) 4 B) 3 C) 2 D) 1

A

Which of the following is an alkyne? A) propyne B) propane C) xylene D) propene

A

Which of the following is required for the transport of oxygen by hemoglobin? A) iron(II) ions (Fe2+) B) sodium ions (Na+) C) calcium ions (Ca2+) D) chloride ions (Cl-)

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) O2 B) O3 (ozone) C) SO3 D) CO2

B

Very low-density lipoproteins are the blood carriers of A) fatty acids B) triglycerides C) cholesterol D) oxygen

B

Water soluble vitamins are A) nonpolar B) polar C) hydrophobic D) ionic

B

When polyester is formed as a film as opposed to a fiber, it is used in A) bulletproof vests B) party balloons C) artificial limbs D) floor tile

B

Which of the following compounds is saturated? A) butadiene B) butane C) propyne D) butene

B

Which of the following is a naturally occurring polymer? A) composites B) starch C) nylon D) None of the above is a naturally occurring polymer

B

A 2000 Calorie per day diet should contain not more than ________ grams of fat. A) 30 B) 50 C) 67 D) 11

C

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

Aldehydes and ketones share a common functional group. The group is the A) ether group B) phenol group C) carbonyl group D) hydroxyl group

C

Cholesterol that is present in the blood serum is closely associated with A) osteoporosis B) overactive kidneys C) hardening of the arteries D) diabetes

C

Complex carbohydrates are essentially polymers of A) glycerol B) nucleicacids C) glucose D) fatty acids

C

Describe what changes occur during alpha decay A) The mass number and atomic number increases B) The mass number and atomic number do not change C) The mass number and atomic number decreases D) The mass number is unchanged and the atomic number increases E) The mass number increases and the atomic number decreases

C

From your bodyʹs perspective, glucose is A) a source of structural material B) an oxidizing agent C) a fuel D) all of the above

C

In general, CFCs are A) solids with low melting points B) liquids with high boiling points C) gases or liquids with low boiling points D) solids with high melting points

C

In the reaction Cu+ + Fe → Cu + Fe2+ (Note: The reaction is not balanced.) A) Cu is the reducing agent B) Cu+ is the reducing agent C) Fe is the reducing agent D) Fe2+ is the reducing agent

C

Iron plays a central role in A) bones B) protein synthesis C) hemoglobin structure and oxygen transport D) nucleic acid replication

C

Low calorie sweeteners have A) low calorie structures B) fewer atoms than natural sweeteners C) greater sweet taste per molecule D) all of the above

C

Monomers are A) small polymers B) ethylene C) small building blocks of polymers D) all of the above

C

Nuclear fission is a process by which the nucleus of an atom A) splits into two or more fragments spontaneously B) combines with another nucleus to produce a larger nucleus C) is induced to split into two or more fragments by some external source D) loses a proton with the release of a large amount of energy

C

Phenols are often used as A) fragrances B) insecticides C) disinfectants D) anesthetics

C

The compound below is a(n) (REFER TO QUESTION 13) A) aldehyde B) alcohol C) ketone D) carboxylic acid

C

The formula for cyclopropane is A) C7H16 B) C7H12 C) C3H6 D) C3H8

C

The formula of benzene is A) C4H4 B) C6H12 C) C6H6 D) C2H2

C

Which of the following is an alkene? A) propane B) propyne C) propene D) xylene

C

Which of the following is currently the mostdesirable method to minimize the problem of disposal of plastics? A) Incinerate them B) Use biodegradable plastics C) Recycle them D) Deposit them in a landfill

C

Which of the following statements about the use of radioisotopes to irradiate foods is NOT true? A) Irradiation has been used for years in some countries B) Radioisotopes kill microorganisms that cause food spoilage C) The taste and appearance of irradiated food undergoes a major change D) There is no residual radiation left in the food after irradiation

C

Which one of the following is most penetrating? A) He nucleus B) beta particle C) gamma ray D) visible light

C

Which one of the following radioactive isotopes is useful in the investigation of thyroid problems? A) Uranium-235 B) Cesium-145 C) Iodine-131 D) Barium-120

C

After one half-lives, what percentage of the original radioactive isotope remains in a sample? A) 75% B) 25% C) 0% D) 50%

D

Alcohols are characterized by which functional group? A) halide B) ester C) carboxyl D) hydroxyl

D

Arteriosclerosis is a condition affecting the A) brain B) heart C) lungs D) arteries

D

Compounds with a hydroxyl group attached directly to a benzene ring are called A) ethers B) aromatic hydrocarbons C) alcohols D) phenols

D

Consider the following reaction: 2 Fe + 3 Mg2+ → 2 Fe3+ + 3 Mg The half-reaction for the oxidation in this reaction is A) Mg → Mg2+ + 2 e- B) Fe3+ + 3 e- → Fe C) Mg2+ + 2 e- → Mg D) Fe → Fe3+ + 3 e

D

Consider the following unbalanced half-reaction: MnO4- → MnO2. The oxidation number of Mn changes from ________, and the Mn is ________. A) +4 to +7, oxidized B) +7 to +4, oxidized C) +4 to +7, reduced D) +7 to +4, reduced

D

Gamma rays can be stopped by A) a sheet of paper B) a block of wood C) a thin aluminum sheet D) several centimeters of lead

D

HDPE finds applications in A) garbage bags B) food wrap C) squeeze bottles D) rigid containers

D

Identify the symptom that is not from radiation exposure A) death B) increased cancer risk C) weaker immune systems D) increased white cell count E) genetic effects

D

Iodine is an important mineral in the proper functioning of the A) brain B) intestines C) heart D) thyroid

D

Most fats are A) diglycerides B) monoglycerides C) pentaglycerides D) triglycerides

D

Nitrogen-13 has a half-life of 10 minutes. How much of a 128 mg sample would remain after 40 minutes? A) 32 mg B) 16 mg C) 4 mg D) 8 mg

D

Polyvinyl chloride is used for drain pipes in plumbing applications. It has replaced traditional cast iron pipe for this purpose. The major advantage of PVC in replacing cast iron for this application (particularly if you are a plumber or homeowner) is that PVC A) is easier to handle and cut B) is of lighter weight C) is more resistant to corrosion D) All of the above are advantages of PVC

D

Some of the fat-laden foods are cream, butter, margarine and ________. A) fish B) celery C) fruit D) salad oils

D

The U.S. government agency charged with keeping our food safe is the A) NCAA B) OSHA C) EPA D) FDA

D

The compound CH3NH2 is called A) dimethylamine B) methyl ammonia C) trimethylamine D) methylamine

D

The following nuclear reaction is an example of 226 88 Ra → 4 2 He + 222 86 Rn A) beta decay B) an impossible reaction C) gamma decay D) alpha decay.

D

The main ingredient in most antifreezes is A) glycerol B) gasoline C) ethanol D) ethylene glycol

D

The monomer used to make PVC is A) F2C=CF2 B) Cl2C=CH2 C) H2C=CH2 D) H2C=CHCl

D

The salts of carboxylic acids, such as sodium benzoate, are often used in foods as A) colorings B) flavor enhancers C) sweeteners D) preservatives

D

This formula in which n can be a very large number represents which of the following polymers? (REFER TO QUESTION 11) A) polyethylene B) polypropylene C) polyvinyl chloride D) Teflon

D

Vitamins can be grouped into two broad categories A) acids and esters B) the B complex and the rest C) esters and amines D) fat soluble and water soluble.

D

What is Teflon used for? A) film B) garbage bags C) bullet-proof vests D) nonstick cookware

D

When oil and water are mixed vigorously, the oil is broken up into tiny droplets that are dispersed throughout the water. This dispersed mixture is a(n) A) organophosphate B) lipoprotein C) bile mixture D) emulsion

D

When radium-223 undergoes alpha decay, what other product is formed? A) radium-224 B) actinium-224 C) radium-219 D) radon-219

D

Which of the following compounds is an amine? A) CH3CH2CH2CH2CO2CH3 B) CH3CH2CH2CH2Br C) CH3COOH D) (CH3CH2)2NH E) CH3OCH3

D

Which of the following is a definition of reduction? A) Reduction is the gain of BOTH electrons AND oxygen B) Reduction is the loss of hydrogen C) Reduction is the loss of electrons D) Reduction is the loss of oxygen.

D

Determine the identity of the daughter nuclide from the alpha decay of 210/84 Po. A) 211/85 At B) 212/88 Ra C) 208/80 Hg D) 206/86 Rn E) 206/82 Pb

E

Identify the following diagnostic procedure that gives the highest dose of radiation A) mammogram B) chest x-ray C) dental x-ray -- panoramic D) upper gastrointestinal tract x-ray E) thallium heart scan

E

A deficiency of vitamin A may cause A) cardiac arrest B) blindness C) schizophrenia D) stroke

B

A disease or condition that vitamin C is known to cure is A) beriberi B) scurvy C) rickets D) rickets

B

A serving of a low fat cream cheese contains 6 g of fat and 3 g of protein. What percentage of calories comes from fat?(1 g fat = 9 kcal) (1 g protein = 4 kcal) A) 23% B) 82% C) 73% D) 50%

B

A substance undergoing oxidation will A) lose oxygen B) lose electrons C) gain hydrogen D) gain electrons

B

Benzoic acid serves as a A) moisturizer B) preservative C) flavoring D) oxidizing agent

B

Blood sugar is A) fructose B) glucose C) lactose D) galactose

B

Compounds that have two alkyl groups attached to an oxygen atom are called A) esters B) ethers C) alcohols D) phenols

B

Consider the following unbalanced equation between copper(I) ions and iron to produce copper metal and iron(II) ions: Cu+ + Fe → Cu + Fe2+ What is oxidized in this reaction? A) copper B) iron C) copper(I) ion D) iron(II) ion

B

Esters have been widely used as A) insecticides B) fragrances C) refrigerants D) disinfectants

B

Excess intake of sodium chloride (salt) can cause A) beriberi B) hypertension C) phenylketonuria D) goiter

B

Fiber in the diet A) is rich in vitamins B) makes a person feel full and therefore take in less food C) is readily converted to fat D) provides quick energy

B

Gadolinium-153 is the most widely used radioisotope in medicine. It is used for the detection of A) obstructions in blood flow B) osteoporosis C) tumors D) heart disease.

B

High-density polyethylene is composed of A) primarily highly branched, non-linear chains of polyethylene in a diffuse packing arrangement B) primarily linear, unbranched chains of polyethylene in a close packing arrangement C) a mixture of polyethylene and polystyrene D) polyethylene with high density plasticizers added to increase density

B

In organic chemistry, compounds are generally classified by A) state B) functional group C) color D) odor

B

In the late stages of extended starvation or fast, the body uses what as a source of energy? A) carbohydrate B) protein C) fat D) glycogen

B

Ketosis is a condition that develops during A) overeating B) starvation C) exercise D) stress

B

Kwashiorkor is a disease caused by A) iron deficiency B) extreme lack of protein and vitamins C) sedentary life style D) lack of iodine

B

Many organic solvents are no longer used for large-scale extraction of chemicals from plants. Why are organic solvents being replaced? A) Organic solvents do not extract most low polarity compounds B) Organic solvents are often mutagenic or carcinogenic C) Organic solvents are safer, but more expensive D) Organic solvents generate smaller volumes of waste.

B

One serving of chunk light tuna in water contains 0.5 g of fat. The total food calories in one serving is 60. What percentage of calories come from fat? A) 15% B) 7.5% C) <1% D) 75%

B

Plants incorporate carbon as long they live. Once a plant dies, it takes how many years for 99.9% of the carbon-14 to decay (half-life of C-14 is 5730 years)? A) 2865 yrs B) 57300 yrs C) 573 yrs D) 5730 yrs

B

Polyunsaturated fats have A) primarily C-C bonds B) a large proportion of C=C bonds C) one or more C===C bonds D) an odd number of carbon atoms

B

Saturated fats have A) a large proportion of C=C bonds B) primarily C-C bonds C) an odd number of carbon atoms D) one or more C===C bonds

B

Silver is plated on copper by immersing a piece of copper into a solution containing silver ions. In the plating reaction, silver ions A) are reduced and are the reducing agent B) arereduced and are the oxidizing agent C) are oxidized and are the reducing agent D) are oxidized and are the oxidizing agent

B

The class of foods that has the highest caloric value is A) carbohydrates B) fats C) vitamins D) protein

B

The compound below is classified as a(n) A) aldehyde B) carboxylic acid C) ester D) ketone

B

The condensed structural formula for the molecule below is (REFER TO QUESTION 20) A) CH3CH2CH2CH2CH2CH3 B) CH3CH2CH(CH3)2 C) CH3CH2C(CH3)2CH3 D) none of the above

B

The fat soluble vitamins are A) A, B, C, K B) A, D, E, K C) A, C, D, K D) B, C, D, E

B

The use of new and greener solvents has resulted in all of the following EXCEPT A) reduced production of waste materials B) more hazardous reaction conditions C) safer reaction conditions D) lower risk of fires

B

Thermoplastic polymers may be A) heated, but not reformed B) heated and reformed C) decomposed by heating D) changed in color by heating

B