Question 1

Which of the following elements are the least reactive?

Accepted Answer

A)   alkali metals
B)   noble gases
C)   halogens
D)   alkaline earth metals
E)   metalloidsF) A) and E)
G) B) and E)

Question 2

Ionic compounds may carry a net positive or negative charge.

Accepted Answer

A) True 
 B)False

Question 3

Tetrasulfur dinitride decomposes explosively when heated. What is its formula?

Accepted Answer

A)   S2N4
B)   S4N2
C)   4SN2
D)   S4N
E)   S2NF) None of the above
G) B) and E)

Question 4

Who is credited with first measuring the charge of the electron?

Accepted Answer

A)   Dalton
B)   Gay-Lussac
C)   Thomson
D)   Millikan
E)   RutherfordF) A) and B)
G) B) and E)

Question 5

Which one of the following groups does not contain any metals?

Accepted Answer

A)   C, S, As, H
B)   Cu, P, Se, Kr
C)   N, Ne, Nd, Np
D)   Xe, Hg, Ge, O
E)   Cl, Al, Si, ArF) D) and E)
G) A) and B)

Question 6

Which, if any, of the following elements do not occur in the major classes of organic compounds?

Accepted Answer

A)   H
B)   C
C)   N
D)   O
E)   All the above elements occur in the major classes of organic compounds.F) A) and D)
G) C) and D)

Question 7

Lead (Pb) is a main-group element.

Accepted Answer

A) True 
 B)False

Question 8

What is the name of PCl3?

Accepted Answer

A)   phosphorus chloride
B)   phosphoric chloride
C)   phosphorus trichlorate
D)   trichlorophosphide
E)   phosphorus trichlorideF) A) and E)
G) C) and D)

Question 9

Which one of the following combinations of names and formulas of ions is incorrect?

Accepted Answer

A)   O2- oxide
B)   Cd2+ cadmium
C)   ClO3- chlorate
D)   HCO3- hydrogen carbonate
E)   NO2- nitrateF) A) and E)
G) A) and D)

Question 10

Diiodine pentaoxide is used as an oxidizing agent that converts carbon monoxide to carbon dioxide. What is its chemical formula?

Accepted Answer

A)   I2O5
B)   IO5
C)   2IO5
D)   I5O2
E)   (IO5) 2F) A) and E)
G) A) and D)

Question 11

Atoms X, Y, Z, and R have the following nuclear compositions: 
 
Which two are isotopes?

Accepted Answer

A)   X & Y
B)   X & R
C)   Y & R
D)   Z & R
E)   X & ZF) B) and C)
G) A) and B)

Question 12

Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope bromine-81,  . Select the combination which lists the correct atomic number, neutron number, and mass number, respectively.

Accepted Answer

A)   35, 46, 81
B)   35, 81, 46
C)   81, 46, 35
D)   46, 81, 35
E)   35, 81, 116F) None of the above
G) B) and C)

Question 13

When an atom is represented by the symbol  , the value of A is the

Accepted Answer

A)   number of neutrons in the atom.
B)   number of protons in the atom.
C)   atomic mass of the element.
D)   total number of electrons and neutrons in the atom.
E)   total number of protons and neutrons in the atom.F) C) and D)
G) B) and E)

Question 14

Ammonium sulfate, (NH4) 2SO4, is a fertilizer widely used as a source of nitrogen. Calculate its molecular mass.

Accepted Answer

A)   63.07 amu
B)   114.l0 amu
C)   118.13 amu
D)   128.11 amu
E)   132.13 amuF) B) and E)
G) B) and D)

Question 15

One amu is defined as

Accepted Answer

A)   the mass of a proton.
B)   1/12 the mass of an atom of 12C.
C)   the mass of an atom of 1H.
D)   1/20 the mass of an atom of 20Ne.
E)   1/16 the mass of an atom of 16O.F) B) and C)
G) C) and D)

Question 16

State the two important experimental results (and the names of the responsible scientists) which enabled the mass of the electron to be determined.

Accepted Answer

Thomson measured m/e, the mass...

Question 17

What is the name of the acid formed when H2S gas is dissolved in water?

Accepted Answer

A)   sulfuric acid
B)   sulfurous acid
C)   hydrosulfuric acid
D)   hydrosulfurous acid
E)   sulfidic acidF) A) and E)
G) None of the above

Question 18

All neutral atoms of tin have 50 protons and 50 electrons.

Accepted Answer

A) True 
 B)False

Question 19

Determine the molecular mass of iron (III)  bromide hexahydrate, a substance used as a catalyst in organic reactions.

Accepted Answer

A)   403.65 amu
B)   355.54 amu
C)   317.61 amu
D)   313.57 amu
E)   295.56 amuF) B) and E)
G) B) and C)

Question 20

Calcium hydroxide is used in mortar, plaster and cement. What is its formula?

Accepted Answer

A)   CaOH
B)   CaOH2
C)   Ca2OH
D)   Ca(OH) 2
E)   CaHO2F) B) and E)
G) C) and D)

Exam 2: The Components of Matter

Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope bromine-81, . Select the combination which lists the correct atomic number, neutron number, and mass number, respectively.

Correct AnswerverifiedShow Answer

Atoms X, Y, Z, and R have the following nuclear compositions: Which two are isotopes?

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Lead (Pb) is a main-group element.

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Which one of the following groups does not contain any metals?

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Determine the molecular mass of iron (III) bromide hexahydrate, a substance used as a catalyst in organic reactions.

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What is the name of PCl3?

Correct AnswerverifiedShow Answer

State the two important experimental results (and the names of the responsible scientists) which enabled the mass of the electron to be determined.

Correct AnswerverifiedThomson measured m/e, the mass...View AnswerShow Answer

Ionic compounds may carry a net positive or negative charge.

Correct AnswerverifiedShow Answer

All neutral atoms of tin have 50 protons and 50 electrons.

Correct AnswerverifiedShow Answer

When an atom is represented by the symbol , the value of A is the

Correct AnswerverifiedShow Answer

What is the name of the acid formed when H2S gas is dissolved in water?

Correct AnswerverifiedShow Answer

Ammonium sulfate, (NH4) 2SO4, is a fertilizer widely used as a source of nitrogen. Calculate its molecular mass.

Correct AnswerverifiedShow Answer

Diiodine pentaoxide is used as an oxidizing agent that converts carbon monoxide to carbon dioxide. What is its chemical formula?

Correct AnswerverifiedShow Answer

Which one of the following combinations of names and formulas of ions is incorrect?

Correct AnswerverifiedShow Answer

Which of the following elements are the least reactive?

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Which, if any, of the following elements do not occur in the major classes of organic compounds?

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Tetrasulfur dinitride decomposes explosively when heated. What is its formula?

Correct AnswerverifiedShow Answer

Who is credited with first measuring the charge of the electron?

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One amu is defined as

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Calcium hydroxide is used in mortar, plaster and cement. What is its formula?

Correct AnswerverifiedShow Answer

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What is the name of PCl₃?

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Thomson measured m/e, the mass...
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What is the name of the acid formed when H₂S gas is dissolved in water?

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Ammonium sulfate, (NH₄) ₂SO₄, is a fertilizer widely used as a source of nitrogen. Calculate its molecular mass.

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