Question 1

Millikan's oil drop experiment determined the charge of the _____.

Accepted Answer

The answer of Millikan's oil drop experiment determined the charge...

Question 2

If 1.00 g of an unknown molecular compound contains 8.35 × 1021 molecules, what is its molar mass?

Accepted Answer

A)  44.0 g/mol 
B)  66.4 g/mol 
C)  72.1 g/mol 
D)  98.1 g/mol 
E)  132 g/mol 
A)  44.0 g/mol 
B)  66.4 g/mol 
C)  72.1 g/mol 
D)  98.1 g/mol 
E)  132 g/mol

Question 3

Which ionic compound has the stronger force of attraction between anions and cations: sodium bromide or potassium bromide?

Accepted Answer

The force of attraction is stronger for

Question 4

The atomic number of fluorine is _____.

Accepted Answer

A)  7 
B)  9 
C)  10 
D)  19 
E)  13 
A)  7 
B)  9 
C)  10 
D)  19 
E)  13

Question 5

The masses of isotopes and their abundances are determined experimentally using _____.

Accepted Answer

A)  a mass spectrometer 
B)  an analytical balance 
C)  a centrifuge 
D)  distillation 
E)  electrolysis 
A)  a mass spectrometer 
B)  an analytical balance 
C)  a centrifuge 
D)  distillation 
E)  electrolysis

Question 6

Elements that have the same number of protons, but differ in their number of neutrons are called _____.

Accepted Answer

The answer of Elements that have the same number of...

Question 7

Calculate the number of moles in 0.48 g of Cu.

Accepted Answer

A)  0.033 mol 
B)  0.48 mol 
C)  31 mol 
D)  7.6 × 10−3 mol 
E)  1.3 × 102 mol 
A)  0.033 mol 
B)  0.48 mol 
C)  31 mol 
D)  7.6 × 10−3 mol 
E)  1.3 × 102 mol

Question 8

Copper has an atomic weight of 63.55 u. If 69.17% of copper exists as 63Cu (62.93960 u), what is the identity and the atomic mass of the other isotope?

Accepted Answer

A)  Cu-64; 63.82 u 
B)  Cu-64; 64.16 u 
C)  Cu-65; 64.16 u 
D)  Cu-65; 64.92 u 
E)  Cu-66; 65.91 u 
A)  Cu-64; 63.82 u 
B)  Cu-64; 64.16 u 
C)  Cu-65; 64.16 u 
D)  Cu-65; 64.92 u 
E)  Cu-66; 65.91 u

Question 9

Which of the following is the correct formula for potassium dihydrogen phosphate?

Accepted Answer

A)  KH2PO4 
B)  K2HPO4 
C)  K2H2PO4 
D)  K3H2PO4 
E)  KH2P 
A)  KH2PO4 
B)  K2HPO4 
C)  K2H2PO4 
D)  K3H2PO4 
E)  KH2P

Question 10

Which of the following is the correct formula for calcium nitrate?

Accepted Answer

A)  CaN 
B)  Ca3N2 
C)  CaNO2 
D)  Ca3(NO3)2 
E)  Ca(NO3)2 
A)  CaN 
B)  Ca3N2 
C)  CaNO2 
D)  Ca3(NO3)2 
E)  Ca(NO3)2

Question 11

Silver has two stable isotopes with masses of 106.90509 u and 108.9047 u. The atomic weight of silver is 107.868 u. What is the percent abundance of each isotope?

Accepted Answer

A)  50.0% 107Ag and 50.0% 109Ag 
B)  51.8% 107Ag and 48.2% 109Ag 
C)  55.4% 107Ag and 44.6% 109Ag 
D)  48.2% 107Ag and 51.8% 109Ag 
E)  44.6% 107Ag and 55.4% 109Ag 
A)  50.0% 107Ag and 50.0% 109Ag 
B)  51.8% 107Ag and 48.2% 109Ag 
C)  55.4% 107Ag and 44.6% 109Ag 
D)  48.2% 107Ag and 51.8% 109Ag 
E)  44.6% 107Ag and 55.4% 109Ag

Question 12

Which of the following sets of ions is present in sodium sulfate, Na2SO4?

Accepted Answer

A)  Na+, S2−, and O2− 
B)  Na+, S2+, and O2− 
C)  Na+ and SO42− 
D)  Na+, S2−, and O2+ 
E)  Na+ and SO4− 
A)  Na+, S2−, and O2− 
B)  Na+, S2+, and O2− 
C)  Na+ and SO42− 
D)  Na+, S2−, and O2+ 
E)  Na+ and SO4−

Question 13

A 0.4272 g sample of an element contains 2.241 × 1021 atoms. What is the symbol of the element?

Accepted Answer

A)  In 
B)  Cs 
C)  Sb 
D)  Xe 
E)  Te 
A)  In 
B)  Cs 
C)  Sb 
D)  Xe 
E)  Te

Question 14

Which of the following atoms contains the least protons?

Accepted Answer

A)  232Th 
B)  231Pa 
C)  245Pu 
D)  238U 
E)  232Pa 
A)  232Th 
B)  231Pa 
C)  245Pu 
D)  238U 
E)  232Pa

Question 15

Which of the following is the common name for the compound PH3?

Accepted Answer

A)  Laughing gas 
B)  Hydrazine 
C)  Nitroglycerin 
D)  Ammonia 
E)  Phosphine 
A)  Laughing gas 
B)  Hydrazine 
C)  Nitroglycerin 
D)  Ammonia 
E)  Phosphine

Question 16

Which of the following is the correct formula for manganese(III) sulfate?

Accepted Answer

A)  MnSO4 
B)  Mn2SO4 
C)  Mn3(SO4)2 
D)  Mn2(SO4)3 
E)  Mn(SO4)2 
A)  MnSO4 
B)  Mn2SO4 
C)  Mn3(SO4)2 
D)  Mn2(SO4)3 
E)  Mn(SO4)2

Question 17

If two different isotopes have the same atomic number, it means that _____.

Accepted Answer

A)  they have the same atomic mass 
B)  they have the same atomic 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 
A)  they have the same atomic mass 
B)  they have the same atomic 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

Question 18

Which of the following is the correct molar mass of sodium sulfate?

Accepted Answer

A)  55.06 g/mol 
B)  119.1 g/mol 
C)  78.05 g/mol 
D)  142.0 g/mol 
E)  110.0 g/mol 
A)  55.06 g/mol 
B)  119.1 g/mol 
C)  78.05 g/mol 
D)  142.0 g/mol 
E)  110.0 g/mol

Question 19

A 0.0050 g sample of boron contains _____ boron atoms.

Accepted Answer

A)  4.6 × 10-4 
B)  7.7 × 10-28 
C)  2.8 × 1020 
D)  3.1 × 1021 
E)  3.3 × 1022 
A)  4.6 × 10-4 
B)  7.7 × 10-28 
C)  2.8 × 1020 
D)  3.1 × 1021 
E)  3.3 × 1022

Question 20

Which of the following is the correct mass percent of each element in sulfuric acid, H2SO4?

Accepted Answer

A)  2.055% H, 32.69% S, and 65.25% O 
B)  1.028% H, 32.69% S, and 66.28% O 
C)  28.57% H, 14.29% S, and 57.17% O 
D)  1.028% H, 33.72% S, and 65.25% O 
E)  2.016% H, 32.07% S, and 65.91% O 
A)  2.055% H, 32.69% S, and 65.25% O 
B)  1.028% H, 32.69% S, and 66.28% O 
C)  28.57% H, 14.29% S, and 57.17% O 
D)  1.028% H, 33.72% S, and 65.25% O 
E)  2.016% H, 32.07% S, and 65.91% O

Exam 3: Atoms, Molecules, and Ions

Millikan's oil drop experiment determined the charge of the _____.

If 1.00 g of an unknown molecular compound contains 8.35 × 1021 molecules, what is its molar mass?

Which ionic compound has the stronger force of attraction between anions and cations: sodium bromide or potassium bromide?

The atomic number of fluorine is _____.

The masses of isotopes and their abundances are determined experimentally using _____.

Elements that have the same number of protons, but differ in their number of neutrons are called _____.

Calculate the number of moles in 0.48 g of Cu.

Copper has an atomic weight of 63.55 u. If 69.17% of copper exists as 63Cu (62.93960 u), what is the identity and the atomic mass of the other isotope?

Which of the following is the correct formula for potassium dihydrogen phosphate?

Which of the following is the correct formula for calcium nitrate?

Silver has two stable isotopes with masses of 106.90509 u and 108.9047 u. The atomic weight of silver is 107.868 u. What is the percent abundance of each isotope?

Which of the following sets of ions is present in sodium sulfate, Na2SO4?

A 0.4272 g sample of an element contains 2.241 × 1021 atoms. What is the symbol of the element?

Which of the following atoms contains the least protons?

Which of the following is the common name for the compound PH3?

Which of the following is the correct formula for manganese(III) sulfate?

If two different isotopes have the same atomic number, it means that _____.

Which of the following is the correct molar mass of sodium sulfate?

A 0.0050 g sample of boron contains _____ boron atoms.

Which of the following is the correct mass percent of each element in sulfuric acid, H2SO4?

Basic Concepts of Chemistry

Lets Review: the Tools of Quantitative Chemistry

Chemical Reactions

Stoichiometry: Quantitative Information About Chemical Reactions

Principles of Chemical Reactivity: Energy and Chemical Reactions

The Structure of Atoms

The Structure of Atoms and Periodic Trends

Bonding and Molecular Structure

Bonding and Molecular Structure Orbital Hybridization and Molecular Orbitals

Gases and Their Properties

Intermolecular Forces and Liquids

The Solid State

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Chemical Reactivity: Equilibria

Principles of Chemical Reactivity: the Chemistry of Acids and Bases

Principles of Chemical Reactivity: Other Aspects of Aqueous Equilibria

Principles of Chemical Reactivity: Entropy and Free Energy

Principles of Chemical Reactivity: Electron Transfer Reactions

Environmental Chemistry: Earths Environment, Energy, and Sustainability

The Chemistry of the Main Group Elements

The Chemistry of the Transition Elements

Carbon: Not Just Another Element

Biochemistry

Nuclear Chemistry

Filters

If 1.00 g of an unknown molecular compound contains 8.35 × 10²¹ molecules, what is its molar mass?

Copper has an atomic weight of 63.55 u. If 69.17% of copper exists as ⁶³Cu (62.93960 u), what is the identity and the atomic mass of the other isotope?

Which of the following sets of ions is present in sodium sulfate, Na₂SO₄?

A 0.4272 g sample of an element contains 2.241 × 10²¹ atoms. What is the symbol of the element?

Which of the following is the common name for the compound PH₃?

Which of the following is the correct mass percent of each element in sulfuric acid, H₂SO₄?