Chemistry Final
Which of these substances would exhibit dipole forces? a .NCl3 b. Cl2 c. SiH4 d. CCl4 e. CO2
a .NCl3
What is the concentration in molarity when 3.00 grams of K3PO4 is dissolved in 350 mL of H2O? (molar mass of K3PO4 = 212.3 g/mol) a. 0.0404 M b. 0.0565 M c. 0.121 M d. 0.161 M e. 0.323 M
a. 0.0404 M
Which of these numbers has the four significant figures? a. 0.3211 b. 0.201d c. 6.02 × 10^23 d. 5100 e. 0.0103
a. 0.3211
How many square meters of photovoltaic cells would be required to provide sufficient energy to light a 60 W computer monitor? Photovoltaic cells are 15% efficient in converting 1000 W/m2 of solar energy to electricity. a. 0.40 m2 b. 2.5 m2 c. 14 m2 d. 9 m2 e. 400 m2
a. 0.40 m2
Ethane and oxygen react to form carbon dioxide and water. What mass of water is formed if 6 g of ethane react with 22.4 g of oxygen to produce 17.6 g of carbon dioxide? a. 10.8 g b. 11.6 g c. 16.4 g d. 23.6 g e. 28.4 g
a. 10.8 g
Solve the problem. 1.5 × 103 + 3.14 × 104− 1.21 × 102 = ? a. 3.28 × 10^4 b. 3.30 × 10^3 c. 3.3 × 10^−4 d. 3.30 × 10^5 e. 3.43 × 10^9
a. 3.28 × 10^4
Convert 89.5 meters to millimeters. a. 8.95 × 10^4 mm b. 8.95 × 10^−4 mm c. 8.95 × 10^2 mm d. 8.95 × 10^−2 mm e. None of these.
a. 8.95 × 10^4 mm
In electrochemical cells ____ occurs at the anode and ____ occurs at the cathode. a. oxidation, reduction b. reduction, oxidation c. oxidation, oxidation d. gain of mass, reduction e. loss of mass, oxidation
a. oxidation, reduction
Nitrogen-13 has a half-life of 10 minutes. How much of a 16 mg sample would remain after 40 minutes? a. 0.5 mg b. 1 mg c. 2 mg d. 4 mg e. 8 mg
b. 1 mg
Calculate the density with the correct number of significant figures of a 50.0 g sample of mercury with a volume of 3.66 mL. a. 13.66 g/mL b. 13.7 g/mL c. 183 g/mL d. 0.0732 g/mL e. 0.073 g/mL
b. 13.7 g/mL
Automotive air bags inflate when a sample of NaN3 (molar mass = 65 g/mol) is rapidly decomposed. What mass of NaN3 is required to produce 368 L of nitrogen gas (molar mass = 28 g/mol) with a density of 1.25 g/L? 2NaN3(s) → 2Na(s) + 3N2(g) a. 228 g b. 712 g c. 1709 g d. 2136 g e. 3203 g
b. 712 g
Chemical waste is often shipped in 55-gallon drums. What is the weight in pounds of a 55-gallon drum if the density of the waste is 1.5942 g/cm3? (454 g = 1 pound; 0.9463 L = 1 quart; 4 quarts = 1 gallon) a. 130 lbs b. 731 lbs c. 810 lbs d. 4.5 × 104 lbs e. 5.9 × 104 lbs
b. 731 lbs
How many kilograms of calcium are there in a 173 pounds of calcium? (1 pound = 454 grams) a. 1.1 kg b. 78.54 kg c. 1.1 × 102 kg d. 3.8 × 104 kg e. 7.85 × 104 kg
b. 78.54 kg
What is the approximate composition of the earth's atmosphere? a. 80 % oxygen and 20 % nitrogen b. 80 % nitrogen and 20 % oxygen c. 50 % nitrogen and 50 % oxygen d. 100 % oxygen e. 100 % nitrogen
b. 80 % nitrogen and 20 % oxygen
Which of these is the correct formula for aluminum oxide? a. Al2O2 b. Al2O3 c. AlO d. Al3O2 e. AlO2
b. Al2O3
Photovoltaic systems take solar energy and convert it into ____. a. heat b. electricity c. electrons d. solar thermal power e. steam
b. electricity
The processes by which an excited electron returns to its ground state with the emission of energy is known as ____. a. photodecomposition b. electronic relaxation c. spectroscopy d. electronic degradation e. microwave radiation
b. electronic relaxation
Which of these does not involve an increase in the random motion of a system? a. burning log b. freezing water c. exploding bomb d. hot skillet e. helium escaping from a balloon
b. freezing water
Photosynthesis: a. requires energy and is therefore exothermic. b. requires energy and is therefore endothermic. c. releases energy and is therefore exothermic. d. releases energy and is therefore endothermic. e. does not involve a change in energy.
b. requires energy and is therefore endothermic.
` A polymer that softens when heated or hardens when cooled is known as a(n) ____. a. copolymer b. thermoplastic c. condensation polymer d. addition polymer e. Elastomer
b. thermoplastic
A force which acts through a distance is known as ____. a. heat b. work c. energy d. enthalpy e. entropy
b. work
Given that 1 in = 2.54 cm, which of the following is true? a. 1 in2 = 2.54 cm2 b. 1 in2 = 5.08 cm2 c. 1 in2 = 6.45 cm2 d. 1 in2 = 1.27 cm2 e. None of these.
c. 1 in2 = 6.45 cm2
Rank these substances in increasing acidity (least acidic to most acidic). 1.0 M HCOOH, 1.0 M HCl, 1.0 M NH3 , 1.0 M NaOH a. 1.0 M HCOOH < 1.0 M HCl < 1.0 M NH3 < 1.0 M NaOH b. 1.0 M NH3 < 1.0 M HCOOH < 1.0 M NaOH < 1.0 M HCl c. 1.0 M NaOH < 1.0 M NH3 < 1.0 M HCOOH < 1.0 M HCl d. 1.0 M NaOH < 1.0 M HCOOH < 1.0 M NH3 < 1.0 M HCl e. 1.0 M NH3 < 1.0 M NaOH < 1.0 M HCOOH < 1.0 M HCl
c. 1.0 M NaOH < 1.0 M NH3 < 1.0 M HCOOH < 1.0 M HCl
A balloon contains 14.0 L of air at a pressure of 760 torr. What will be the volume of the air when the balloon is taken to a region with a pressure of 981 torr? a. 1.3 L b. 8.2 L c. 10.8 L d. 14.0 L e. 18 L
c. 10.8 L
What is the coefficient in front of oxygen when the equation is balanced? __CH3OH + __O2→ __CO2 + __H2O a. 1 b. 2 c. 3 d. 4 e. 6
c. 3
Determine the efficiency of a solar system which uses a focusing system covering 135 m2 and produces 41.0 kW of power. The solar power available is 1000 W/m2. a. 1.8% b. 14% c. 30% d. 55% e. 94%
c. 30%
An irregular shaped piece of metal with a mass of 85.5 g was placed in a graduated cylinder that contained 25.00 mL of water. This raised the water level to 45.35 mL. What is the density of the metal? a. 0.238 g/mL b. 2.3 g/mL c. 4.2 g/mL d. 5.16 g/mL e. 20.35 g/mL
c. 4.2 g/mL
Approximately what % of states that have legislated renewable portfolio standards as of 2007? a. 2% b. 25% c. 50% d. 75% e. 100%
c. 50%
Which of these is not an alkane? a. C2H6 b. C3H8 c. C5H10 d. C6H14 e. CH4
c. C5H10
Which of these equations best represents the reaction that takes place in the stomach when the antacid calcium carbonate is taken? a. NaHCO3→ H2O + CO b. CaCO3→ H2O + CO c. CO32- + 2H3O+→ 3H2O + CO2 d. Ca2+ + 2H3O+→ 3H2O + CaO e. CaCO3 + H3O+→ Ca(OH)2 + CO2
c. CO32- + 2H3O+→ 3H2O + CO2
Which nation leads the world in energy consumption per capita? a. Russia b. United States c. Canada d. Germany e. Nigeria
c. Canada
Which of these statements about chlorinated hydrocarbons is incorrect? a. Chlorinated hydrocarbons make good solvents. b. Chlorinated hydrocarbons are used as insecticides. c. Chlorinated hydrocarbons are relatively unstable and reactive. d. Chlorinated hydrocarbons decrease the flammability of hydrocarbons. e. Chlorinated hydrocarbons have been credited with depletion of the ozone.
c. Chlorinated hydrocarbons are relatively unstable and reactive.
Which of these is currently the most cost competitive at creating fuel to replace fossil fuels? I.solar power tower II.parabolic trough III.dish engine a. I only b. II only c. I, II and III d. I and II e. I and III
c. I, II and III
Which of these is the correct normal decimal notation for 5.23 × 10−4? a. 0.0523 b. 0.00523 c. 0.0000523 d. 0.000523 e. 52,300
d. 0.000523
Which of these is not equivalent to one mole? a. 6.022 × 1023 marbles b. 12 grams of carbon c. Avogadro's number d. 12 grams of magnesium e. 28 grams of nitrogen, N2
d. 12 grams of magnesium
A sample of helium occupies 1.40 L at 0o C and 760 torr. What pressure will the same gas exert in a 0.500 L vessel at 100o C? a. 371 torr b. 624 torr c. 1.56 x 103 torr d. 2.91 x 103 torr e. 4.05 x 103 torr
d. 2.91 x 103 torr
Analysis of a sodium chloride (NaCl) sample indicated that it contained 15 g of sodium and 23.1 g of chlorine. Determine the mass of chlorine in a sample of NaCl if the mass of sodium is 22.5 g. a. 14.6 g b. 30.0 g c. 34.1 g d. 34.7 g e. 41.6 g
d. 34.7 g
An irregular shaped piece of metal with a mass of 105 g was placed in a graduated cylinder that contained 25.00 mL of water. This raised the water level to 45.35 mL What is the density of the metal? a. 0.238 g/mL b. 2.3 g/mL c. 4.2 g/mL d. 5.16 g/mL e. 20.35 g/mL
d. 5.16 g/mL
The atomic mass of fluorine (F) is 19.00. Which of the following is not true? a. An atom of F has a mass of 19.00 amu. b. One mole of F has a mass of 19.00 g. c. 6.02 x 1023 atoms of F has a mass of 19.00 g. d. 6.02 x 1023 atoms of F has a mass of 19.00 amu.
d. 6.02 x 1023 atoms of F has a mass of 19.00 amu.
The half-life of protactinium-231 is 3.25 x 104 years. How long will it take for 10.4 grams of Pa-231 to decay to 2.7 grams? a. 8.1 x 10^6 years b. 4.0 x 10^5 years c. 1.3 x 10^5 years d. 6.2 x 10^4 years e. 1.5 x 10^4 years
d. 6.2 x 10^4 years
Which of the following is true about ozone? a. Its Lewis structure is best represented with resonance structures. b. It reduces the amount of ultraviolet radiation that reached the earth's surface. c. It can be broken down by ultraviolet radiation. d. All of the above. e. None of the above.
d. All of the above.
Which of these molecules will have a tetrahedral electron geometry and a tetrahedral molecular geometry? a. PCl3 b. H2O c. C2H2 d. CH3Cl e. SO2
d. CH3Cl
Which of these elements are the primary components in "hard water"? I.magnesium II.iron III.calcium IV.sodium a. I only b. III only c. II and III d. I and III e. II and IV
d. I and III
Which of these processes occur(s) when phosphates are introduced into natural waters? I. Fish and marine life may undergo mutation. II. Fertilized algae grows into extremely large blooms. III. A large number of oxidation reactions deplete the oxygen supply. a. I only b. II only c. I and III d. II and III e. I and II
d. II and III
Which of these processes occur(s) when phosphates are introduced into natural waters? I.Fish and marine life may undergo mutation. II.Fertilized algae grows into extremely large blooms. III.A large number of oxidation reactions deplete the oxygen supply. a. I only b. II only c. I and III d. II and III e. I and II
d. II and III
Which of these equations correctly represents the Haber process? a. 3H2 + N2→ 2NH3 b. Cu2O + C → 2Cu + CO c. Fe2O3 + 3CO → 2Fe + CO2 d. C6H12O6 + 6O2→ 6CO2 + 6H2O e. 6CO2 + 6H2O → C6H12O6 + 6O2
a. 3H2 + N2→ 2NH3
What is the frequency of light emitted by a helium-neon laser with a wavelength of 632.8 nm and a speed of 3 × 108 m/s? a. 4.74 × 1014 s−1 b. 4.74 × 105 s−1 c. 1.58 × 10−3 s−1 d. 2.11 × 10−15 s−1 e. 1.58 × 10−15 s−1
a. 4.74 × 1014 s−1
How many square meters of photovoltaic cells would be required to provide sufficient energy to light a 100 W light bulb? Photovoltaic cells are 15% efficient in converting 1000 W/m2 of solar energy to electricity. a. 6.6 x 10-1 m2 b. 15 m2 c. 67 m2 d. 200 m2 e. 275 m2
a. 6.6 x 10-1 m2
Which of these statements about acid rain is incorrect? a. Acid rain has little effect on visibility. b. Acid rain slows the rate of tree growth. c. Acid rain accelerates the rusting process. d. Acid rain can effectively remove nutrients from soil. e. Acid rain has destroyed all marine life in entire lakes.
a. Acid rain has little effect on visibility.
Which of these is the best definition of a Bronsted-Lowry acid? a. Any substance that donates H+ ions in solution. b. Any substance that produces OH ions in solution. c. Any substance that accepts a lone pair of electrons. d. Any substance that neutralizes a base in solution. e. Any substance that accepts H+ ion in solution.
a. Any substance that donates H+ ions in solution.
Which of these statements about atoms is incorrect? a. Atoms are the smallest visible amount of an element. b. Atoms are composed of protons, neutrons, and electrons. c. Atoms are the building blocks of all matter. d. Atoms are the smallest identifiable unit of an element. e. There are 91 different naturally occurring atoms.
a. Atoms are the smallest visible amount of an element.
Which of these pollutants diminishes the bloods ability to carry oxygen? a. CO b. PM-2.5 c. SO2 d. O3 e. Pb
a. CO
Which of these is the most likely identity of element A in the Lewis dot structure? a. Ca b. Li c. Al d. Cs e. P
a. Ca
Which of these ions found in hard water will reduce the effectiveness of soap? a. Ca2+ b. C4− c. F− d. Ag+ e. Hg2+
a. Ca2+
Which of these substances is a base? a. NaHCO3 b. HCl c. HNO3 d. H3PO4 e .CH3COOH
a. NaHCO3
Which of these is the general formula for a carboxylic acid? a. RCOOH b. RCOR c. RCOH d. ROR e. RCOHR
a. RCOOH
Which of these colors of visible light has the lowest energy? a. Red b. Orange c. Yellow d. Blue e. Violet
a. Red
The dominant intermolecular attractive force between CH3Cl molecules is a. dipole forces. b. dispersion forces. c. hydrogen bonding. d. London forces. e. volatile forces.
a. dipole forces.
The element with the highest electronegativity is _________. a. fluorine b. hydrogen c. helium d. neon
a. fluorine
Which of these forms of alternate power does not get its energy from the sun either directly or indirectly? a. geothermal b. hydroelectric c. wind d. biomass e. solar
a. geothermal
Soap functions in the dissolution of grease when its ____ interacts with the nonpolar grease while its ____ interacts with water. a. hydrocarbon tail, ionic head b. ionic head, hydrocarbon tail c. micelle, hydrocarbon tail d. hydrocarbon tail, micelle e. ionic head, micelle
a. hydrocarbon tail, ionic head
Which of these is the correct molecular geometry of CO2? a. linear b. trigonal planar c. tetrahedral d. pyramidal e. Bent
a. linear
Arrange these spectral regions in order of increasing frequency (x-rays, microwaves, ultraviolet, visible). a. microwaves < visible < ultraviolet < x-rays b. microwaves < visible < x-rays < ultraviolet c. ultraviolet < x-rays < visible < microwaves d. ultraviolet < visible < x-rays < microwaves e. x-rays < microwaves < ultraviolet < visible
a. microwaves < visible < ultraviolet < x-rays
During oxidation-reduction reactions, the substance which loses electrons is ____ and the substance which gains electrons is ____. a. oxidized, reduced b. reduced, oxidized c. reduced, dissolved d. reduced, accelerated e. oxidized, dissolved
a. oxidized, reduced
Which of these has the greatest [H3O+]? a. pH = 2 b. pH = 5 c. pH = 7 d. pH = 11 e. pH = 13
a. pH = 2
The exact frequency which causes a transition in a nucleus is known as the ____. a. resonance frequency b. absorption frequency c. relaxation time d. emission frequency e. resonance imaging
a. resonance frequency
Liquids which vaporize easily and have high vapor pressures are known as ____. a. volatile liquids b. nonvolatile liquids c. explosive liquids d. cohesive liquids e. adhesive liquids
a. volatile liquids
Nuclear chemistry involves changes a. within the nucleus. b. of valence electrons. c. in bond number. d.of inner electrons. e. in photons.
a. within the nucleus.
The volume of 350. mL of gas at 25.0o C is decreased to 125 mL at constant pressure. What is the final temperature of the gas? a. -167 C b. -126 C c. 70 C d. 89 C e. 147 C
a.-167 C
Which of these statements concerning the 1st law of thermodynamics is incorrect? a. Energy is neither created nor destroyed. b. A perpetual motion machine cannot exist. c. The total energy of the universe is constant. d. Chemical energy can be converted to thermal energy. e. Energy is transferred from the system to the surroundings.
b. A perpetual motion machine cannot exist.
Which of these statements about alkanes is not correct? a. Alkanes are nonpolar. b. Alkanes are nonflammable. c. Carbon must always form four bonds. d. Alkanes have a general formula CnH2n +2. e. There are no carbon to carbon double bonds.
b. Alkanes are nonflammable.
Which substance is reduced in this redox equation? HF + Cl2→ F2 + HCl a. HF b. Cl2 c. F d. HCl e. none of these
b. Cl2
Which of these atoms has the most stable nuclei? a. Ca b. Co c. Mg d. Ne
b. Co
Which of these statements about covalent compounds is incorrect? a. Covalent bonds involve the combination of two nonmetals. b. Covalent compounds dissolve in water to form electrolyte solutions. c. Covalent compounds contain atoms which share electrons to gain stability. d. Molecules are represented by a specific kind of chemical formula. e. Electrons in covalent compounds are not always equally shared between atoms.
b. Covalent compounds dissolve in water to form electrolyte solutions.
Which of these statements about heat is incorrect? a. Heat is essentially energy. b. Entropy is another name for heat. c. Heat is random molecular motion. d. Heat is measured in units of joules. e. Heat involves the transfer of energy from a warmer body to a cooler one.
b. Entropy is another name for heat.
Which of these is/are not molecular force(s) that holds hair strands together? I. Disulfide linkages II. Hydrogen bonds III. Nonpolar hydrocarbon tails a. I only b. III only c. I and II d. I and III e. I, II, and III
b. III only
Which of these is the correct formula for potassium phosphate? a. KPO4 b. K3PO4 c. K(PO4)3 d. K2(PO4)3 bK3PO4e. K3P
b. K3PO4
A statement which summarizes the data obtained from a series of observations is known as a(n) ____. a. observation b. Law c. theory d. conclusion e. experiment
b. Law c. theory b & c
Element A has an electronegativity of 0.8 and element B has an electronegativity of 2.0. Which statement best describes the bonding in A3B? a. The AB bond is largely covalent with a δ− on A. b. The AB bond is largely covalent with a δ+ on A. c. The compound is largely ionic with no polar bonds. d. The compound is largely covalent with no polar bonds. e. There is insufficient information.
b. The AB bond is largely covalent with a δ+ on A.
Which of these is the primary difference in lasers? a. The color of the light. b. The nature of the lasing medium. c. The intensity of the light emitted. d. The wavelength of the light emitted. e. The speed at which the light emitted travels.
b. The nature of the lasing medium.
The smallest unit of a chemical compound is a. an atom. b. a molecule. c. a nucleus. d. an alpha particle. e. None of the above are true.
b. a molecule.
Which of these is not a problem associated with geothermal energy? a. It has limited availability. b. Vented steam usually contains sulfurous and ammonia gases. c. Global warming results because of the high levels of CO2 produced. d. Condensed steam from the earth's crust is corrosive to mechanical parts. e. All of these are problems with geothermal energy.
c. Global warming results because of the high levels of CO2 produced.
Which of these interactions between keratin strands is/are broken and reformed to "permanently" curl hair?I. Salt bridges II. Hydrogen bonds III. Disulfide linkages a. I only b. II only c. III only d. I and III e. I, II, and III
c. III only
Which of the following is true for sodium? a. It is most stable as an atom. b. It is most stable as a negatively charged ion. c. It is most stable as a positively charged ion. d. All forms of sodium are very stable. e. All forms of sodium are very unstable.
c. It is most stable as a positively charged ion.
Which of these health concerns are most common with increased radon exposure? a. thyroid cancer b. breast cancer c. Lung cancer d. Birth defects e. leukemia
c. Lung cancer
What are the units of molarity? a. Grams per mole b. Grams per liter c. Moles per liter d. Molecules per liter e. Molecules per mole
c. Moles per liter
Which of these substances is the active ingredient in drain opener? a. HCl b. Bleach c. NaOH d. Sebum e. Zeolite
c. NaOH
The most abundant element in the earth's crust by mass is: a. Hydrogen b. Carbon c. Oxygen d. Silicon e. Nitrogen
c. Oxygen
Covalent bonds are formed when electrons are: a. Transferred b. Split c. Share d. Destroyed e. heated
c. Share
Which of these statements about the sun is incorrect? a. The Sun radiates 1026 watts of energy constantly into space. b. The earth receives approximately 1 part per billion of the suns energy. c. The main problem with solar energy is that it is not energetic enough for use. d. Using solar energy is a problem because of its relatively low concentration. e. All of these are correct statements.
c. The main problem with solar energy is that it is not energetic enough for use.
The difference between the experimentally determined mass and the sum of the masses of all protons and neutrons of an atom is known as the ____. a. nuclear mass b. molar mass c. mass defect d. decay mass e. isotopic mass
c. mass defect
Soap molecules can cluster together and form structures called: a. polymers. b. detergents. c. micelles. d. colloids. e. surfactants.
c. micelles
Which of these statements concerning pH is incorrect? a. pH is based on the [H3O+] in solution. b. If [H3O+] = 1.0 x 10-13, then the solution is basic. c. pH = 3.0 is ten times more acidic than pH = 2. d. If the pH > 7 then the solution is basic. e. Pure water has [H3O+] = 1.0 x 10-7.
c. pH = 3.0 is ten times more acidic than pH = 2.
Which of these processes is represented by the equation? 6H2O + 6CO2 + energy → C6H12O6 + 6O2 a. nitrogen fixation b. combustion c. photosynthesis d. respiration e. ozone depletion
c. photosynthesis
Which of these acts as a pollutant in the troposphere, but as a UV shield in the stratosphere? a. CO b. PM-2.5 c. SO2 d. O3
d. O3
Which of the following has the same molecular formula as hexane? a. 3-methylpentane b. 2,2-dimethylbutane c. cyclohexane d. a and b e. All of the above
d. a and b
A mixture where one substance in a finely divided state is dispersed throughout another is known as a ____. a. polymer b. surfactant c. micelle d. colloidal suspension e. Soap
d. colloidal suspension
Atoms or molecules with unpaired electrons are called: a. Inert b. radiation c. oxidizers d. free radicals e. Antioxidants
d. free radicals
Which of these is the most common type of semiconductor found in photovoltaic cells? a. arsenic b. carbon c. uranium d. silicon e. Hydrogen
d. silicon
Electronegativity is: a. the ability of an atom to form positively charged ions. b. the ability of an atom to form negatively charged ions. c. also called a dipole d. the ability of an atom to attract bonding electrons. e. the ability of an atom to form polar molecules.
d. the ability of an atom to attract bonding electrons.
The most acidic rainfall in the United States occurs in: a. the northwest region. b. the southwest region c. the southeast region d. the northeast region e. the midwest.
d. the northeast region
When multiplying and dividing, the number of significant figures in the answer is determined by: a. the most precise number b. the least precise number c. the number with the most significant figures in the calculation d. the number with the fewest significant figures in the calculation
d. the number with the fewest significant figures in the calculation
Arrange these spectral regions in order of increasing wavelength (infrared, radio waves, ultraviolet, visible). a. radio waves < infrared < visible < ultraviolet b. radio waves < visible < infrared < ultraviolet c. ultraviolet < infrared < visible < radio waves d. ultraviolet < visible < infrared < radio waves e. infrared < radio waves < ultraviolet < visible
d. ultraviolet < visible < infrared < radio waves
Which one of these is a major problem for controlled energy generation by fission? a. air pollution b. acid rain c. greenhouse gases d. waste disposal e. low energy yield per pound
d. waste disposal
Determine the mass in grams of 3.45 × 1025 molecules of oxygen, O2. a. 0.556 grams b. 57.2 grams c. 458 grams d. 916 grams e. 1.83 × 103 grams
e. 1.83 × 103 grams
What is the coefficient in front of carbon dioxide when the equation is balanced? __C8H18 + __O2→ __CO2 + __H2O a. 2 b. 5 c. 10 d. 12 e. 16
e. 16
Normal body temperature is 98.6o F. What is the temperature in Kelvin? a. 23 K b. 37 K c. 119 K d. 177 K e. 310. K
e. 310. K
h3c---CH--CH3--CH--CH3 ==C---CH3 Which of these is the correct name for the structure represented? a. 4-propyl-2-butyne b. 2,3-dimethylhexene c. 2,3-dimethylhexyne d. 1,2,3-trimethylhexyne e. 4,5-dimethyl-2-hexyne
e. 4,5-dimethyl-2-hexyne
Nitrogen and oxygen react to form nitrous oxide. What mass of nitrous oxide is produced when 28.0 g of nitrogen react with 64.0 g of oxygen? a. 0.438 g b. 2.29 g c. 28 g d. 36 g e. 92 g
e. 92 g
38. Which of the following molecules is non-polar? a. CO2 b. N2 c. CH4 d. CCl4 e. All of the above
e. All of the above
Which of these statements is correct? a. Alkanes are saturated hydrocarbons. b. Alkenes have a general formula CnH2n. c. Alkynes are hydrocarbon chains which contain a triple bond. d. Unsaturated hydrocarbons contain at least one multiple bond. e. All of the above
e. All of the above
Which of the following is true for a hydrocarbon? a. It consists of carbon and hydrogen atoms. b. It can form a ring structure. c. It is a good fuel for combustion reactions. d. It can contain double or triple bonds. e. All of the above.
e. All of the above.
Which of these methods is not a mechanism currently being explored for storing solar energy? a. light capture b. heat storage c. battery storage d. creation of chemical bonds e. All of these are acceptable methods.
e. All of these are acceptable methods.
Which of these statements about science is incorrect? a. Science influences culture and society. b. Science reveals knowledge not attainable by other means. c. Science is a fundamental way to understand the world around us. d. Decisions involving scientific principles are often made by nonscientists. e. All of these are correct statements.
e. All of these are correct statements.
Which of these is not a problem associated with soap in hard water? a. Nonbiodegrable products b. Expensive c. Formation of curd d. Decreased effectiveness of soap e. Both A and B are not problems.
e. Both A and B are not problems.
Which of these substances is an acid? a. NaHCO3 b. NaOH c. NH3 d. KOH e. CH3COOH
e. CH3COOH
Which of these molecules contains two double bonds?a. PCl3 b. N2 c. SO2 d. H2O e. CO2
e. CO2
A group of soap molecules will form a micelle to minimize which of these? a. Exposure of surfactants to grease. b. Exposure of micelles to each other. c. Exposure of the ionic head to water. d. Exposure of the ionic head to grease. e. Exposure of the hydrocarbon tail to water.
e. Exposure of the hydrocarbon tail to water.
Which of these is an organic contaminant? a. lead b. mercury c. asbestos d. nitrates e. Gasoline
e. Gasoline
Which of these series correctly orders the values given from smallest to largest?I.100 cmII.1 kmIII.10 mIV.100,000 mm a. I < II < III < IV b. II < I < IV < III c. I < II = III < IV d. I < IV < III < II e. I < III < IV < II
e. I < III < IV < II
Which of these statements concerning pressure and weather are correct? I. Low pressure in a region tends to draw in storms. II. High pressure in a region usually indicates clear weather. III. Changes in pressure from region to region are responsible for winds. a. I only b. III only c. I and II d. I and III e. I, II and III
e. I, II and III
Which of these are properties of bases? I. sour II. turn litmus blue III. dissolve some metals IV. slippery a. I only b. III only c. I and II d. I and III e. II and IV
e. II and IV
Which of these statements about fossil fuels is incorrect? a. Fossil fuels are highly energetic. b. Fossil fuels are primarily hydrocarbons. c. The energy of fossil fuels is released by combustion reactions. d. The energy within fossil fuels ultimately came from photosynthesis. e. The energy of fossil fuels was formed as a result of exothermic reactions in prehistoric plants.
e. The energy of fossil fuels was formed as a result of exothermic reactions in prehistoric plants.
Which of these was the first organic compound ever synthesized from an inorganic one? a. alkane b. aspirin c. alcohol d. gasoline e. Urea
e. Urea
Which of these colors of visible light has the shortest wavelength? a. Red b. Green c. Yellow d. Blue e. Violet
e. Violet
Which of these factors influence the biological effectiveness of radiation? a. chemical nature of the radioactive isotope b. amount of the radioisotope c. type of tissue exposed d. smoking e. all of these
e. all of these
Which of these is most significant problem in developing fusion controlled energy? a. limited resources b. air pollution c. low energy yield d. excessive radioactivity e. containment for high temperature reactions
e. containment for high temperature reactions
Which of these is not a possible unit for pressure? a. in.Hg b. psi c. torr d. mmHg e. lb/s
e. lb/s
