Question 1

An isotope of which of the following elements is chosen as a standard in measuring atomic mass?

Accepted Answer

A)  Carbon
B)  Oxygen
C)  Hydrogen
D)  Neon
E)  HeliumF) A) and D)
G) C) and D)

Question 2

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

Question 3

Which one of the following statements about atoms and subatomic particles is correct?

Accepted Answer

A)  Rutherford discovered the atomic nucleus by bombarding gold foil with electrons.
B)  The proton and the neutron have identical masses.
C)  The neutron's mass is equal to that of a proton plus an electron.
D)  A neutral atom contains equal numbers of protons and electrons.
E)  An atomic nucleus contains equal numbers of protons and neutrons.F) A) and D)
G) A) and E)

Question 4

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

Accepted Answer

A)  Ba 2+ barium
B)  S 2− sulfate
C)  CN − cyanide
D)  ClO 4 − perchlorate
E)  HCO 3 − bicarbonateF) B) and D)
G) A) and D)

Question 5

The chemical symbol for potassium is

Accepted Answer

A)  P.
B)  Po.
C)  Pt.
D)  Pm.
E)  K.F) A) and D)
G) B) and C)

Question 6

What is the formula for magnesium sulfide?

Accepted Answer

A)  MgS
B)  MgS 2
C)  Mg 2S
D)  Mg 2S 3
E)  MgSO 4F) B) and C)
G) A) and C)

Question 7

Which of the following ions occurs commonly?

Accepted Answer

A)  N 3+
B)  S 6+
C)  O 2−
D)  Ca +
E)  Cl +F) A) and E)
G) B) and C)

Question 8

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 B)
G) B) and E)

Question 9

Which one of the following is a polyatomic cation?

Accepted Answer

A)  Nitrate
B)  Chromate
C)  Permanganate
D)  Hydronium
E)  PotassiumF) A) and C)
G) A) and D)

Question 10

A row of the periodic table is called a

Accepted Answer

A)  group.
B)  period.
C)  isotopic mixture.
D)  family.
E)  subshell.F) A) and B)
G) C) and E)

Question 11

What is the name of PCl3?

Accepted Answer

A)  Phosphorus chloride
B)  Phosphoric chloride
C)  Phosphorus trichlorate
D)  Trichlorophosphide
E)  Phosphorus trichlorideF) All of the above
G) A) and C)

Question 12

Millikan's oil-drop experiment

Accepted Answer

A)  established the charge on an electron.
B)  showed that all oil drops carried the same charge.
C)  provided support for the nuclear model of the atom.
D)  suggested that some oil drops carried fractional numbers of electrons.
E)  suggested the presence of a neutral particle in the atom.F) C) and E)
G) B) and E)

Question 13

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)  114.10 amu
C)  118.13 amu
D)  128.11 amu
E)  132.13 amuF) None of the above
G) A) and D)

Question 14

Bromine has two naturally occurring isotopes. 79Br has a mass of 78.9 amu and accounts for 50.3% of bromine atoms. If the atomic mass of bromine is 79.9 amu, what is the mass of an atom of the second bromine isotope?

Accepted Answer

A)  77.9 amu
B)  80.0 amu
C)  80.1 amu
D)  80.9 amu
E)  88.9 amuF) C) and D)
G) A) and B)

Question 15

What is the name of the acid formed when HClO4 liquid is dissolved in water?

Accepted Answer

A)  Hydrochloric acid
B)  Perchloric acid
C)  Chloric acid
D)  Chlorous acid
E)  Hydrochlorate acidF) None of the above
G) B) and D)

Question 16

The compound, P4S10, is used in the manufacture of safety matches. What is its name?

Accepted Answer

A)  Phosphorus sulfide
B)  Phosphoric sulfide
C)  Phosphorus decasulfide
D)  Tetraphosphorus decasulfide
E)  Phosphorus pentasulfideF) B) and C)
G) A) and D)

Question 17

The substance, CaSe, is used in materials which are electron emitters. What is its name?

Accepted Answer

A)  Calcium monoselenide
B)  Calcium(II) selenide
C)  Calcium selenide
D)  Calcium(I) selenide
E)  Calcium(II) seleniumF) B) and C)
G) D) and E)

Question 18

Barium sulfate is used in manufacturing photographic paper. What is its formula?

Accepted Answer

A)  BaSO 4
B)  Ba(SO 4) 2
C)  Ba 2SO 4
D)  Ba 2(SO 4) 3
E)  BaSO 3F) A) and B)
G) A) and C)

Question 19

The compound, BaO, absorbs water and carbon dioxide readily and is used to dry gases and organic solvents. What is its name?

Accepted Answer

A)  Barium oxide
B)  Barium(II) oxide
C)  Barium monoxide
D)  Baric oxide
E)  Barium peroxideF) A) and E)
G) All of the above

Question 20

Select the incorrect statement about elements and compounds.

Accepted Answer

A)  All ionic compounds are neutral.
B)  Some elements exist as molecules.
C)  The bonding in compounds may be covalent or ionic.
D)  The molecular formula of a compound provides more information than the structural formula.
E)  Among the elements, there are more metals than nonmetals.F) B) and D)
G) A) and B)

Exam 2: The Components of Matter

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

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

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Which one of the following is a polyatomic cation?

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The compound, P4S10, is used in the manufacture of safety matches. What is its name?

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Which of the following ions occurs commonly?

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A row of the periodic table is called a

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Which one of the following statements about atoms and subatomic particles is correct?

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The chemical symbol for potassium is

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The substance, CaSe, is used in materials which are electron emitters. What is its name?

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What is the name of the acid formed when HClO4 liquid is dissolved in water?

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Millikan's oil-drop experiment

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What is the formula for magnesium sulfide?

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An isotope of which of the following elements is chosen as a standard in measuring atomic mass?

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Barium sulfate is used in manufacturing photographic paper. What is its formula?

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What is the name of PCl3?

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Bromine has two naturally occurring isotopes. 79Br has a mass of 78.9 amu and accounts for 50.3% of bromine atoms. If the atomic mass of bromine is 79.9 amu, what is the mass of an atom of the second bromine isotope?

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

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The compound, BaO, absorbs water and carbon dioxide readily and is used to dry gases and organic solvents. What is its name?

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Select the incorrect statement about elements and compounds.

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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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The compound, P₄S₁₀, is used in the manufacture of safety matches. What is its name?

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What is the name of the acid formed when HClO₄liquid is dissolved in water?

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What is the name of PCl₃?

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Bromine has two naturally occurring isotopes. ⁷⁹Br has a mass of 78.9 amu and accounts for 50.3% of bromine atoms. If the atomic mass of bromine is 79.9 amu, what is the mass of an atom of the second bromine isotope?

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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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