Accounting
Anthropology
Archaeology
Art History
Banking
Biology & Life Science
Business
Business Communication
Business Development
Business Ethics
Business Law
Chemistry
Communication
Computer Science
Counseling
Criminal Law
Curriculum & Instruction
Design
Earth Science
Economic
Education
Engineering
Finance
History & Theory
Humanities
Human Resource
International Business
Investments & Securities
Journalism
Law
Management
Marketing
Medicine
Medicine & Health Science
Nursing
Philosophy
Physic
Psychology
Real Estate
Science
Social Science
Sociology
Special Education
Speech
Visual Arts
Science
Q:
A 1.4-g sample of washing soda, Na2CO3 - 10H2O, has carbon atoms. How many oxygen atoms are present in 1.4g of washing soda?A) B) C) D) E)
Q:
A sample of TNT, C7H5N3O6, has 7.68 x1021nitrogen atoms. How many hydrogen atoms are there in this sample of TNT?A) 1.54 x 1022B) 10.24 x 1021C) 1.28 x 1022D) 7.68 x 1021E) 1.79 x 1022
Q:
In a particular mass of KAu(CN)2, there are 8.87 x1020atoms of gold. What is the total number of atoms in this sample?A) 1.77 x 1021B) 2.66 x 1021C) 5.32 x 1021D) 4.44 x 1021E) 3.55 x 1021
Q:
Which of the following is/are information that is unique to a space-filling molecular model?
1) The model shows the relative sizes of each element.
2) The model shows the charge distribution.
3) The model shows the types of bonds (single or multiple) connecting the atoms.
A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1, 2, and 3
Q:
Which formula is best described as a (condensed) structural formula?
A) C2B10H12
B) C6H11Cl
C) CH3CH2CH2CH2Cl
D) C12H22O11
E) C2H6O
Q:
All of the following elements are best classified as metalloids except
A) Si.
B) Te.
C) As.
D) B.
E) Ga.
Q:
Which of the following is a metalloid?
A) oxygen
B) hydrogen
C) silicon
D) carbon
E) copper
Q:
Which of the following statements about different elements is/are true?
1) As is a metalloid and Se is a nonmetal.
2) Cu is a transition element and Ge is a metalloid.
3) Both F and I are halogens.
A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1, 2, and 3
Q:
Which element belongs to the transition metals?
A) palladium
B) sodium
C) calcium
D) iodine
E) helium
Q:
Choose the group containing the most reactive nonmetals.
A) Group 5A
B) Group 3A
C) Group 7A
D) Group 8A
E) Group 1A
Q:
The elements in groups 1A-8A or 1-2 and 15-18 are known as the
A) main group.
B) alkaline earth metals.
C) metalloids or semimetals.
D) halogens.
E) transition metals.
Q:
Which of the following statements is not true about the element calcium?A) It is a metal.B) It is an alkaline earth metal.C) It is in period 4.D) It has chemical and physical properties most similar to silver.E) It is in group IIA (group 2).
Q:
Which of the following statements about different elements is incorrect?
A) Potassium is an alkali metal.
B) Fluorine is a halogen.
C) Aluminum is a transition element.
D) Barium is an alkaline earth metal.
E) Helium is a noble gas.
Q:
The elements in a row of the periodic table are known as
A) metals.
B) a period.
C) metalloids.
D) a family.
E) a group.
Q:
A periodic law based on atomic masses would necessitate Te and I changing places in the periodic table. This was not done in the early periodic table because
A) a periodic law based on atomic masses is not valid.
B) it was thought that the atomic masses might be in error.
C) iodine behaves chemically like chlorine and bromine.
D) the tellurium samples could contain a heavy impurity.
E) iodine contains one naturally occurring isotope, whereas tellurium consists of several isotopes.
Q:
Which of the following concerning atomic mass is/are correct?
1) The atomic mass listed on a modern periodic table for each element is the mass of the most abundant isotope.
2) The atomic mass listed on a modern periodic table is a relative atomic mass, based on the definition that 12C equals 12 amu.
3) Relative atomic masses can only be determined with a mass spectrometer.
A) 1 only
B) 2 only
C) 1 and 2
D) 2 and 3
E) 1, 2, and 3
Q:
An element, X, has the following isotopic composition: X-200, 90%; X-199, 8.0%; and X-202, 2.0%. Its average atomic mass is closest to
A) 200 amu.
B) 203 amu.
C) 199 amu.
D) 202 amu.
E) 201 amu.
Q:
Neon has three naturally occuring isotopes. The abundance of 20Ne is 90.48% and 22Ne is 9.25%. What is the percent abundance of 21Ne?
A) 9.25%
B) 0.27%
C) 49.9%
D) 33.2%
E) 81.2%
Q:
Naturally occurring element X exists in three isotopic forms: X-28 (27.977amu, 92.21% abundance), X-29 (28.976 amu, 4.70% abundance), and X-30 (29.974 amu, 3.09% abundance). Calculate the atomic weight of X.
A) 29.09 amu
B) 28.09 amu
C) 35.29 amu
D) 86.93 amu
E) 25.80 amu
Q:
The average atomic mass of Eu is 151.96 amu. There are only two naturally occurring isotopes of europium, 151Eu with a mass of 151.0 amu and 153Eu with a mass of 153.0 amu. The natural abundance of the 131Eu isotope must be approximately
A) 60%.
B) 20%.
C) 50%.
D) 80%.
E) 40%.
Q:
A certain element is listed as having an atomic mass of 63.5 amu. It is probably true that this element contains
A) a mixture of isotopes.
B) a mixture of neutrons.
C) a mixture of isomers.
D) a mixture of allotropes.
E) a mixture of ions.
Q:
Lithium has two naturally occurring isotopes, 6Li and 7Li . The average atomic mass of lithium is 6.941. Which of the following statements concerning the relative abundance of each isotope is correct?
A) The abundance of 7Li is greater than 6Li.
B) The abundance of 7Li is less than 6Li.
C) The abundance of 6Li is equal to the abundance of 7Li.
D) Not enough data is provided to determine the correct answer.
E) Based on the atomic mass, only 7Li occurs naturally.
Q:
The mass spectrum of an element with two naturally occurring isotopes is shown below. Its average atomic mass would be best estimated as A) less than 26 amu but greater than 25 amu.
B) less than 25 amu but greater than 24 amu.
C) equal to 24 amu.
D) equal to 25 amu.
E) greater than 26 amu.
Q:
The mass spectrum of an element with two naturally occurring isotopes is shown below. What is the best estimate of the element's atomic mass? A) 10 amu
B) 11 amu
C) 10.8 amu
D) 10.2 amu
E) 10.5 amu
Q:
Which of the following elements has the largest atomic mass?
A) rhenium
B) manganese
C) thallium
D) argon
E) fluorine
Q:
Which of the following has 62 neutrons, 46 protons, and 46 electrons?
A) B) C) D) E)
Q:
What is the symbol of the nuclide having 15 protons and 16 neutrons?
A) B) C) D) E)
Q:
The neutral atoms of all the isotopes of the same element have
A) different numbers of protons.
B) the same number of neutrons.
C) the same number of electrons.
D) the same mass.
E) the same mass number.
Q:
Which of the following about the isotopes of a particular element is not true?
A) Each unique isotope has a different atomic mass.
B) Each unique isotope has a different atomic number.
C) Each unique isotope has a different number of neutrons.
D) Each unique isotope has the same number of protons.
E) In neutral atoms of each unique isotope, the number of electrons equals the number of protons.
Q:
There are three isotopes of carbon differing with respect to
A) electron configuration.
B) nuclear charge.
C) number of neutrons.
D) number of protons.
E) atomic number.
Q:
Which of the following represents a pair of isotopes? Atomic Number Mass Number A)I1736II1836B)I715II815C)I1735II1737D)I1737181838E)I716II817
Q:
Which of the following atomic symbols represents an isotope of ?
A) B) C) D) E)
Q:
Which of the following statements is true concerning the two nuclides and ?
A) They have the same number of neutrons.
B) They are isotopes.
C) They have the same relative atomic mass.
D) They have the same mass number.
E) They have different chemical properties.
Q:
Suppose atom 1 has the same number of protons as atom 2, and atom 2 has the same number of neutrons as atom 3. Atom 1 does not have the same number of neutrons as atom 3. Which of the following statements is true?
A) Atom 3 must have the same number of protons as atom 2.
B) Atoms 1 and 2 must be isotopes.
C) Atoms 1 and 3 must be isotopes.
D) Atom 2 must have the same number of neutrons as atom 1.
E) Atom 3 must have the same number of protons as atom 1.
Q:
How many neutrons are there in 6 molecules of ?
A) 204
B) 102
C) 6
D) 396
E) 192
Q:
Which of the following nuclides contains more protons than neutrons?
A) B) C) D) E)
Q:
The species that has the same number of neutrons as is
A) .
B) .
C) .
D) .
E) .
Q:
Which combination of protons, neutrons, and electrons correctly represents a 56Fe nuclide?
A) 26 protons, 30 neutrons, 56 electrons
B) 26 protons, 30 neutrons, 30 electrons
C) 26 protons, 30 neutrons, 26 electrons
D) 56 protons, 26 neutrons, 56 electrons
E) 56 protons, 26 neutrons, 26 electrons
Q:
An atom that has the same number of neutrons as is
A) .
B) .
C) .
D) .
E) .
Q:
How many neutrons are there in the cobalt-59 nuclide?
A) 27
B) 2
C) 86
D) 59
E) 32
Q:
How many protons are there in the chromium-52 nuclide?
A) 29
B) 76
C) 23
D) 24
E) 28
Q:
How many electrons does the ion have?
A) 18
B) 36
C) 16
D) 34
E) 19
Q:
Which nuclide has the same number of protons as ?
A) B) C) D) E)
Q:
The number of protons in a given nucleus determines the
A) mass number.
B) atomic number.
C) number of electrons.
D) number of protons.
E) number of isotopes.
Q:
If two different nuclides have the same mass number, it must mean that
A) the combined number of protons and neutrons are the same.
B) both have the same number of neutrons.
C) both have the same number of electrons.
D) both have the same number of protons.
E) they are isotopes.
Q:
If two different nuclides have the same atomic number, it must mean that
A) they have the same atomic mass.
B) they have the same mass number.
C) they have the same number of protons.
D) they have the same number of electrons.
E) they have the same number of neutrons.
Q:
The nucleus of a 208Pb nuclide contains
A) 208 neutrons and 290 electrons.
B) 82 protons and 208 neutrons.
C) 208 protons and 126 electrons.
D) 208 protons, 82 neutrons, and 208 electrons.
E) 82 protons and 126 neutrons.
Q:
If the Thomson model of the atom had been correct, Rutherford would have observed
A) alpha particles bouncing off the foil.
B) alpha particles going through the foil with little or no deflection.
C) alpha particles greatly deflected by the metal foil.
D) positive particles formed in the foil.
E) None of the above observations is consistent with the Thomson model of the atom.
Q:
Who discovered the nucleus of an atom?
A) Thomson
B) de Broglie
C) Rutherford
D) Bohr
E) Heisenberg
Q:
Which of the following conclusions regarding Rutherford's gold foil experiment is not consistent with the observations?
A) The nucleus occupies only a small portion of the space of an atom.
B) Most alpha particles travel straight through the gold foil.
C) The nucleus occupies a large amount of the atom space.
D) The nucleus, like the alpha particles used to bombard the gold foil, is positively charged.
E) Wide angle deflections result from a collision of an alpha particle and a gold atom nucleus.
Q:
Who discovered the electron?
A) Bohr
B) de Broglie
C) Rutherford
D) Heisenberg
E) Thomson
Q:
Experiments were carried out in which a beam of cathode rays was first bent by a magnetic field and then bent back by an electrostatic field until the beam hit the screen exactly where it had been hitting before the fields were applied. This experiment permitted the direct measurement of
A) the ratio of mass to charge of an electron.
B) the charge on the nucleus of an atom.
C) the charge on the electron.
D) the mass of the atom.
E) the mass of the electron.
Q:
A subatomic particle is
A) a piece of an atom.
B) only found in the nucleus of an atom.
C) always positively charged.
D) larger than the nucleus of an atom.
E) always negatively charged.
Q:
Cathode rays are
A) anions.
B) protons.
C) cations.
D) positrons.
E) electrons.
Q:
Which of the following pairs of compounds can be used to illustrate the law of multiple proportions?
A) H2O and HCl
B) NO and NO2
C) NH4and NH4Cl
D) ZnO2and ZnCl2
E) CH4and CO2
Q:
According to the law of multiple proportions:
A) the total mass is the same after a chemical change as before the change.
B) it is not possible for the same two elements to form more than one compound.
C) the ratio of the masses of the elements in a compound is always the same.
D) if the same two elements form two different compounds, they do so in the same ratio.
E) none of these
Q:
A series of silicon"hydrogen compounds with the general formula SinH2n+2can be represented by the known compounds SiH4, Si2H6, and Si3H8. This best illustrates the law of
A) multiple proportions.
B) conservation of charge.
C) definite composition.
D) conservation of mass.
E) conservation of atoms.
Q:
Which of the following is the atomic symbol for the element cobalt?
A) CO
B) Co
C) C
D) co
E) All of the above
Q:
The names of the elements whose symbols are Si, P, Mn, and S are, respectively,
A) silicon, phosphorus, manganese, and sulfur.
B) silicon, potassium, magnesium, and sulfur.
C) silver, phosphorus, magnesium, and sodium.
D) silver, potassium, manganese, and sodium.
E) silicon, potassium, manganese, and sulfur.
Q:
Which of the following lists gives the atomic symbols for potassium, magnesium, beryllium, and sodium?
A) Po, Mn, Br, Na
B) P, Mn, Be, Se
C) K, Mg, Be, Na
D) Pt, Mg, Be, Sc
E) K, Mn, Br, Na
Q:
Which one of the following lists gives the correct symbols for the elements phosphorus, potassium, silver, chlorine, and sulfur?
A) P, Po, Ag, Cl, S
B) K, Ag, Po, Cl, S
C) P, K, Ag, Cl, S
D) Ph, K, Ag, S, Cl
E) Ph, Po, Ag, Cl, S
Q:
What is the symbol for the element phosphorus?
A) Po
B) P
C) Pt
D) K
E) Pr
Q:
The symbol for tin is
A) T.
B) Tn.
C) Si.
D) Ti.
E) Sn.
Q:
Which of the following is not a correct name"symbol combination?A) cobalt, CoB) vanadium, VC) neon, NeD) scandium, ScE) titanium, Mg
Q:
The daily dietary energy requirement for an adult is 2.00 x103kcal (1 cal = 4.184 J). This is equivalent toA) 8.37 x 103J.B) 8.37 x 103kJ.C) 478 kJ.D) 2.00 x 103kJ.E) 47.8 x 104kJ.
Q:
A sample of milk is found to have arsenic at a concentration of 3.57g/L. What is the concentration in ounces per gallon?1 qt = 946.4 mL1 gal = 4 qt16 oz = 1 lb1 lb = 0.4536 kgA) 2.68 x 103oz/galB) 4.77 x 10-7oz/galC) 2.46 oz/galD) 3.84 x 10-4oz/galE) 3.32 x 10-8oz/gal
Q:
A barleycorn is an English unit of length equal to 1/3 of an inch. What is the height of the Sears Tower (527m) expressed in barleycorn? (2.54 cm = 1 in)A) 4.02 x105barleycornB) 6.92 x103barleycornC) 6.22 x104barleycornD) 4.46 x104barleycornE) 6.92 x10-1barleycorn
Q:
How many rundlets are there in 237in3? Some conversion factors that may be useful are given below:_ 1.00 barrel = 42.0 gal_ 1.00 gal = 231 in3_ 1.00 gal = 3.78 L_ 1.00 rundlet = 6.81 x104mL_ 1.00 L = 1000.0 mL_ 1.00 barrel = 4.00 firkinsA) 0.569B) 14,100,000C) 26,400D) 986,000E) 0.0569
Q:
The SI unit for the diffusion coefficient is m2/s, but older texts sometimes report diffusion coefficients in units of in2/min. What is the value of a diffusion coefficient of 25.5in2/min expressed in SI units? (2.54 cm = 1 in exactly)A) 1.08 x 10-2m2/sB) 3.89 x 105m2/sC) 16.7 m2/sD) 6.59 x 102m2/sE) 2.74 x 10-4m2/s
Q:
A lightminute is a unit of length equal to the distance that light travels in 1 minute. What is 1lightminute expressed in units of meters? The speed of light is 3.00 x108m/s.A) 5.00 x 106mB) 1.80 x 1010mC) 3.00 x 108mD) 2.00 x 10-7mE) 5.56 x 10-11m
Q:
A barn is an atomic unit of area equal to 10-28m2. What is the surface area of the Earth expressed in units of barn? Assume the Earth is a sphere with a radius of 6380km. (The surface area of a sphere is 4r2.)A) 5.12 x 1042barnB) 5.12 x 10-20barnC) 5.12 x 1036barnD) 5.12 x 10-14barnE) 5.12 x 1030barn
Q:
A hogshead is an old English unit of volume equal to 238.48L. What is the volume of a cube with an edge length of 49.7m expressed in units of hogshead? (1000 L = 1 m3)A) 5.15 x 105hogsheadB) 5.15 x 102hogsheadC) 5.15 x 10-1hogsheadD) 2.93 x 1010hogsheadE) 2.93 x 104hogshead
Q:
How many joules are there in 9.55 kcal? (1 calorie = 4.184 J)A) 4.00 x 10-2JB) 4.00 x 104JC) 40 JD) 2.28 x 103JE) 2.28 J
Q:
How many liters are in 14.7 fluid ounces of a soft drink? (1floz=28.35mL)A) 5.19 x 10-4LB) 5.19 x 102LC) 4.17 x 105LD) 4.17 x 102LE) 0.417 L
Q:
A certain substance makes up 2.2 x10-4 percent by mass of a normal healthy human being. How many grams of that substance would be found in the body of a person weighing 160lb? (1.0 kg = 2.2 lb)A) 1.6 gB) 0.16 gC) 350 gD) 160 gE) 0.8 g
Q:
How many cubic micrometers equal one cubic meter?A) 104B) 10-18C) 106D) 1018E) 10-6
Q:
Express the volume 166.7cm3 in liters.A) 1.667 LB) 0.01667 LC) 0.1667 LD) 16.67 LE) 166.7 L
Q:
The density of a particular solid is 5.81g/cm3at 25ºC. What is its density in kilograms per cubic meter (kg/m3)?A) 5.81 x 1010B) 5.81 x 101C) 5.81 x 10-2D) 5.81 x 103E) 5.81 x 107
Q:
How many milligrams of ammonium nitrate are equivalent to 3.77x10-5kg of ammonium nitrate?A) 3.77 x 1010B) 3.77 x 104C) 3.77 x 107D) 3.77 x 10-7E) 3.77 x 101
Q:
The enthalpy of combustion of n-octane, C8H18, is -4.79 x107J/kg. What is the enthalpy of combustion expressed in kJ/g?A) -4.79 x1010kJ/gB) -4.79 x107kJ/gC) -4.79 x103kJ/gD) -4.79 x101kJ/gE) -4.79 x104kJ/g