Question 1

Protons and neutrons are examples of __________

Accepted Answer

A)  nuclei. 
B)  nuclides. 
C)  nucleons. 
D)  isotopes. 
E)  charged particles. 
A)  nuclei. 
B)  nuclides. 
C)  nucleons. 
D)  isotopes. 
E)  charged particles.

Question 2

Which has more mass, 1 g of CO2 gas or 1 g of CO gas?

Accepted Answer

A)  CO 
B)  CO2 
C)  Both have the same mass. 
D)  It depends on the density of these gases. 
E)  It depends on the volume of these gases. 
A)  CO 
B)  CO2 
C)  Both have the same mass. 
D)  It depends on the density of these gases. 
E)  It depends on the volume of these gases.

Question 3

Which of the following is most likely to exhibit covalent bonding?

Accepted Answer

A)  NaF 
B)  CaCl2 
C)  Cs2O 
D)  CO2 
E)  NaCl 
A)  NaF 
B)  CaCl2 
C)  Cs2O 
D)  CO2 
E)  NaCl

Question 4

Who discovered electrons?

Accepted Answer

A)  Robert Boyle 
B)  Robert Millikan 
C)  Joseph John Thomson 
D)  John Dalton 
E)  Albert Einstein 
A)  Robert Boyle 
B)  Robert Millikan 
C)  Joseph John Thomson 
D)  John Dalton 
E)  Albert Einstein

Question 5

What is the symbol for magnesium?

Accepted Answer

A)  M 
B)  Mg 
C)  Mn 
D)  Mo 
E)  Ma 
A)  M 
B)  Mg 
C)  Mn 
D)  Mo 
E)  Ma

Question 6

The average atomic mass of lithium is 6.941 amu. Lithium has two naturally occurring isotopes, 6Li (7.52%) and 7Li (92.48%). The mass of 6Li is 6.0151 amu. What is the mass of 7Li?

Accepted Answer

A)  7.016 amu 
B)  0.926 amu 
C)  6.001 amu 
D)  7.000 amu 
E)  6.941 amu 
A)  7.016 amu 
B)  0.926 amu 
C)  6.001 amu 
D)  7.000 amu 
E)  6.941 amu

Question 7

Enriched weapons-grade uranium consists of 80% uranium-235 (235.044 amu) and 20% uranium-238 (238.051 amu). What is the average atomic mass of weapons grade uranium assuming the percentages are exact?

Accepted Answer

A)  235.044 amu 
B)  236.547 amu 
C)  238.051 amu 
D)  235.645 amu 
E)  235.754 amu 
A)  235.044 amu 
B)  236.547 amu 
C)  238.051 amu 
D)  235.645 amu 
E)  235.754 amu

Question 8

Calcium is an example of __________

Accepted Answer

A)  an alkali metal. 
B)  a transition metal. 
C)  an alkaline earth metal. 
D)  a halogen. 
E)  a chalcogen. 
A)  an alkali metal. 
B)  a transition metal. 
C)  an alkaline earth metal. 
D)  a halogen. 
E)  a chalcogen.

Question 9

What is the chemical formula for manganese(IV) oxide?

Accepted Answer

The answer of What is the chemical formula for manganese(IV)...

Question 10

Which one of the following is a molecular compound? Molecular compounds also are known as covalent compounds.

Accepted Answer

A)  Na2O 
B)  CaO 
C)  FeO 
D)  CCl4 
E)  Fe2O3 
A)  Na2O 
B)  CaO 
C)  FeO 
D)  CCl4 
E)  Fe2O3

Question 11

A   atom has __________ protons, __________ neutrons, and __________ electrons.

Accepted Answer

A)  17, 18, 19 
B)  17, 20, 17 
C)  17, 17, 20 
D)  17, 18, 17 
E)  18, 17, 18 
A)  17, 18, 19 
B)  17, 20, 17 
C)  17, 17, 20 
D)  17, 18, 17 
E)  18, 17, 18

Question 12

Which would produce the larger mass of carbon dioxide, CO2, when combined with oxygen: 1 g of pure carbon or 1 g of pure octane (C8H14)? Assume that all the carbon is converted to carbon dioxide in both cases.

Accepted Answer

A)  C 
B)  C8H14 
C)  They would produce the same mass of CO2. 
D)  It depends on the densities of the carbon and octane. 
A)  C 
B)  C8H14 
C)  They would produce the same mass of CO2. 
D)  It depends on the densities of the carbon and octane.

Question 13

Which particle diagram is the best representation for a   atom?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 14

For each of the elements below, there are only two naturally occurring isotopes. Using information in your periodic table, identify the pair in which the lighter isotope is the more abundant one.

Accepted Answer

A) "6Li" and 7Li 
B) "79Br" and 81Br 
C) "10B" and 11B 
D) "191Ir" and 193Ir 
E) "50V" and 51V 
A) "6Li" and 7Li 
B) "79Br" and 81Br 
C) "10B" and 11B 
D) "191Ir" and 193Ir 
E) "50V" and 51V

Question 15

The emission of a F1F1F1S1F1F1F10 particle is associated with the __________

Accepted Answer

A)  conversion of a neutron to a proton. 
B)  conversion of a proton to a neutron. 
C)  increase in mass number. 
D)  decrease in mass number. 
E)  the formation of an isotope. 
A)  conversion of a neutron to a proton. 
B)  conversion of a proton to a neutron. 
C)  increase in mass number. 
D)  decrease in mass number. 
E)  the formation of an isotope.

Question 16

Which statement best describes isotopes?

Accepted Answer

A)  They have the same atomic mass. 
B)  They have the same total number of protons and neutrons. 
C)  They have the same number of neutrons but a different number of protons. 
D)  They have the same number of protons but a different number of neutrons. 
E)  They have very different chemical reactivity. 
A)  They have the same atomic mass. 
B)  They have the same total number of protons and neutrons. 
C)  They have the same number of neutrons but a different number of protons. 
D)  They have the same number of protons but a different number of neutrons. 
E)  They have very different chemical reactivity.

Question 17

Iron can form two sulfides: FeS and Fe2S3. Use Dalton's law of multiple proportions to predict the ratio of the two masses of sulfur that combine with 100 g of iron in each case to form these compounds.

Accepted Answer

A)  1:1 
B)  1:3 
C)  1:2 
D)  2:3 
E)  3:4 
A)  1:1 
B)  1:3 
C)  1:2 
D)  2:3 
E)  3:4

Question 18

Which stellar nuclear reaction is not correctly written?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 19

Aqua regia is a mixture of hydrochloric acid and nitric acid that is capable of dissolving gold. What are the formulas of these acids?

Accepted Answer

A)  HClO, HNO4 
B)  HClO4, HNO3 
C)  HCl, HNO2 
D)  HCl, HNO3 
E)  HCl, HNO 
A)  HClO, HNO4 
B)  HClO4, HNO3 
C)  HCl, HNO2 
D)  HCl, HNO3 
E)  HCl, HNO

Question 20

Write the complete atomic symbol with both a superscript and a subscript for a sodium ion that contains 11 protons, 10 electrons, and 12 neutrons.

Accepted Answer

The answer of Write the complete atomic symbol with both...

Exam 2: Atoms, Ions, and Compounds

Protons and neutrons are examples of __________

Which has more mass, 1 g of CO2 gas or 1 g of CO gas?

Which of the following is most likely to exhibit covalent bonding?

Who discovered electrons?

What is the symbol for magnesium?

The average atomic mass of lithium is 6.941 amu. Lithium has two naturally occurring isotopes, 6Li (7.52%) and 7Li (92.48%). The mass of 6Li is 6.0151 amu. What is the mass of 7Li?

Enriched weapons-grade uranium consists of 80% uranium-235 (235.044 amu) and 20% uranium-238 (238.051 amu). What is the average atomic mass of weapons grade uranium assuming the percentages are exact?

Calcium is an example of __________

What is the chemical formula for manganese(IV) oxide?

Which one of the following is a molecular compound? Molecular compounds also are known as covalent compounds.

A atom has __________ protons, __________ neutrons, and __________ electrons.

Which would produce the larger mass of carbon dioxide, CO2, when combined with oxygen: 1 g of pure carbon or 1 g of pure octane (C8H14)? Assume that all the carbon is converted to carbon dioxide in both cases.

Which particle diagram is the best representation for a atom?

For each of the elements below, there are only two naturally occurring isotopes. Using information in your periodic table, identify the pair in which the lighter isotope is the more abundant one.

The emission of a  particle is associated with the __________

Which statement best describes isotopes?

Iron can form two sulfides: FeS and Fe2S3. Use Dalton's law of multiple proportions to predict the ratio of the two masses of sulfur that combine with 100 g of iron in each case to form these compounds.

Which stellar nuclear reaction is not correctly written?

Aqua regia is a mixture of hydrochloric acid and nitric acid that is capable of dissolving gold. What are the formulas of these acids?

Write the complete atomic symbol with both a superscript and a subscript for a sodium ion that contains 11 protons, 10 electrons, and 12 neutrons.

Matter, Energy, and the Origins of the Universe

Chemical Reactions and Earths Composition

Solution Chemistry and the Hydrosphere

Thermochemistry

Properties of Gases: the Air We Breathe

Electrons in Atoms and Periodic Properties

Chemical Bonding and Climate Change

Molecular Geometry and Bonding Theories

Forces Between Ions and Molecules

Solutions and Their Colligative Properties

The Chemistry of Solids

Organic Chemistry: Fuels, Pharmaceuticals, and Materials

Thermodynamics: Spontaneous Processes, Entropy, and Free Energy

Chemical Kinetics

Chemical Equilibrium

Equilibrium in the Aqueous Phase

The Colorful Chemistry of Metals

Electrochemistry and the Quest for Clean Energy

Biochemistry: the Compounds of Life

Nuclear Chemistry

Life and the Periodic Table

Filters

Which has more mass, 1 g of CO₂ gas or 1 g of CO gas?

The average atomic mass of lithium is 6.941 amu. Lithium has two naturally occurring isotopes, ⁶Li (7.52%) and ⁷Li (92.48%). The mass of ⁶Li is 6.0151 amu. What is the mass of ⁷Li?

A atom has protons, neutrons, and __ electrons.

Which would produce the larger mass of carbon dioxide, CO₂, when combined with oxygen: 1 g of pure carbon or 1 g of pure octane (C₈H₁₄)? Assume that all the carbon is converted to carbon dioxide in both cases.

Iron can form two sulfides: FeS and Fe₂S₃. Use Dalton's law of multiple proportions to predict the ratio of the two masses of sulfur that combine with 100 g of iron in each case to form these compounds.