Question 1

Which of the following represents a pair of isotopes?
Atomic Number
Mass Number

Accepted Answer

A)  I 17 34 II 18 34
B)  I 7 14 II 8 14
C)  I 17 35 II 17 37
D)  I 17 37 II 18 38
E)  I 7 15 II 8 16F) A) and C)
G) B) and C) C

Question 2

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

Accepted Answer

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.F) A) and B)
G) A) and C)

Question 3

Which statement is incorrect concerning the formation of ionic compounds?

Accepted Answer

A)  Halogens tend to form anions with a charge of -1.
B)  Alkali metals tend to form cations with a charge of +1.
C)  Metals tend to form cations,while nonmetals tend to form anions.
D)  Transition metals tend to form cations with a charge of +3.
E)  Noble gases tend not to form ionic compounds.F) A) and B)
G) A) and C)

Question 4

Which of the following statements about different elements is incorrect?

Accepted Answer

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.F) C) and D)
G) A) and D)

Question 5

How many electrons does a sulfide ion have?

Accepted Answer

A)  13
B)  22
C)  16
D)  18
E)  2F) A) and D)
G) A) and C)

Question 6

The formula of the chlorite ion is

Accepted Answer

A)  Cl2O3-.
B)  ClO4-.
C)  Cl-.
D)  ClO2-.
E)  ClO3-.F) A) and B)
G) B) and C)

Question 7

The number of protons in a given nucleus determines the

Accepted Answer

A)  mass number.
B)  atomic number.
C)  number of electrons.
D)  number of protons.
E)  number of isotopes.F) B) and E)
G) A) and C)

Question 8

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?

Accepted Answer

A)  9.25%
B)  0.27%
C)  49.9%
D)  33.2%
E)  81.2%F) All of the above
G) A) and E)

Question 9

Which element belongs to the alkali metals?

Accepted Answer

A)  rubidium
B)  germanium
C)  barium
D)  iodine
E)  argonF) A) and B)
G) A) and C)

Question 10

Who discovered the electron?

Accepted Answer

A)  Bohr
B)  de Broglie
C)  Rutherford
D)  Heisenberg
E)  ThomsonF) A) and B)
G) B) and C) E

Question 11

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

Accepted Answer

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.F) All of the above
G) A) and E)

Question 12

The formula for the sulfide ion is

Accepted Answer

A)  SO32-.
B)  SO42-.
C)  S2O32-.
D)  S2-.
E)  HSO4-.F) C) and E)
G) A) and E)

Question 13

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

Accepted Answer

A)  200 amu.
B)  203 amu.
C)  199 amu.
D)  202 amu.
E)  201 amu.F) A) and B)
G) A) and D)

Question 14

Which of the following is an ionic compound?

Accepted Answer

A)  HOClO
B)  NH3
C)  CH3OH
D)  N2O3
E)  NH4CNF) C) and E)
G) A) and C)

Question 15

Choose the group containing the most reactive nonmetals.

Accepted Answer

A)  Group 5A
B)  Group 3A
C)  Group 7A
D)  Group 8A
E)  Group 1AF) All of the above
G) C) and D)

Question 16

The formula for potassium carbonate is

Accepted Answer

A)  P2C.
B)  K2CO3.
C)  Po2CO3.
D)  P2CO3.
E)  K2C.F) A) and B)
G) A) and C) B

Question 17

Which one of the following equations is properly balanced?

Accepted Answer

A)  Sn + 4HNO3 → SnO2 + 4NO2 + 2H2O
B)  2Na2SO4 + 3Bi(NO3) 3 → Bi2(SO4) 3 + 9NaNO3
C)  CH3CHO + 3O2 → 2CO2 + 2H2O
D)  NH4NO3 → 2H2O + N2
E)  Na2CO3 + 2H2SO4 → Na2SO4 + 2H2O + CO2F) B) and D)
G) C) and E)

Question 18

Which of the following molecules contains the alcohol functional group?

Accepted Answer

A)  C6H6
B)  CH3OH
C)  CH4
D)  CH3OCH3
E)  C2H2F) C) and D)
G) C) and E)

Question 19

Which of the following molecules contains the carboxylic acid functional group?

Accepted Answer

A)  CH3CH2CH2OH
B)  CH3CH2COCH2CH3
C)  CH3NHCH3
D)  CH3OCH2CH3
E)  CH3CH2CH2COOHF) B) and D)
G) B) and E)

Question 20

The empirical formula of a salt consisting of Ba2+ and OH- ions is

Accepted Answer

A)  Ba2+OH-.
B)  BaOH.
C)  Ba2OH.
D)  Ba2(OH) 3.
E)  Ba(OH) 2.F) A) and B)
G) A) and D)

Exam 2: Atoms, molecules, and Ions

Which of the following represents a pair of isotopes? Atomic Number Mass Number

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

Which statement is incorrect concerning the formation of ionic compounds?

Correct AnswerverifiedShow Answer

Which of the following statements about different elements is incorrect?

Correct AnswerverifiedShow Answer

How many electrons does a sulfide ion have?

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The formula of the chlorite ion is

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The number of protons in a given nucleus determines the

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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?

Correct AnswerverifiedShow Answer

Which element belongs to the alkali metals?

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Who discovered the electron?

Correct AnswerverifiedE

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

Correct AnswerverifiedShow Answer

The formula for the sulfide ion is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is an ionic compound?

Correct AnswerverifiedShow Answer

Choose the group containing the most reactive nonmetals.

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The formula for potassium carbonate is

Correct AnswerverifiedB

Which one of the following equations is properly balanced?

Correct AnswerverifiedShow Answer

Which of the following molecules contains the alcohol functional group?

Correct AnswerverifiedShow Answer

Which of the following molecules contains the carboxylic acid functional group?

Correct AnswerverifiedShow Answer

The empirical formula of a salt consisting of Ba2+ and OH- ions is

Correct AnswerverifiedShow Answer

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C

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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?

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E

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B

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The empirical formula of a salt consisting of Ba²⁺ and OH^- ions is

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