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 B)
G) A) and C)

Question 2

Lead (Pb) is a main-group element.

Accepted Answer

A) True 
 B)False

Question 3

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) A) and E)
G) A) and C)

Question 4

What is the name of PCl3?

Accepted Answer

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

Question 5

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) B) and E)
G) A) and C)

Question 6

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) D) and E)
G) B) and D)

Question 7

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) None of the above
G) C) and E)

Question 8

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 D)
G) B) and E)

Question 9

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 10

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 C)
G) B) and C)

Question 11

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) A) and C)
G) A) and D)

Question 12

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) A) and E)
G) A) and C)

Question 13

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

Accepted Answer

A)   S2N4
B)   S4N2
C)   4SN2
D)   S4N
E)   S2NF) B) and E)
G) A) and E)

Question 14

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) C) and D)
G) C) and E)

Question 15

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) B) and E)
G) A) and E)

Question 16

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) A) and B)
G) A) and D)

Question 17

Ionic compounds may carry a net positive or negative charge.

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

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) B) and E)
G) C) and E)

Question 20

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 D)
G) B) and C)

Exam 2: The Components of Matter

Ionic compounds may carry a net positive or negative charge.

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

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

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Which of the following elements are the least reactive?

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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

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

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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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One amu is defined as

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

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

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

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

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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.

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

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What is the name of PCl3?

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

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Lead (Pb) is a main-group element.

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

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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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What is the name of PCl₃?

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