Question 1

Which of the following is the correct name for the compound SrCl2?

Accepted Answer

A)  Strontium dichloride 
B)  Strontium dichlorine 
C)  Strontium(III) dichloride 
D)  Strontium chloride 
E)  Iodine strontide 
A)  Strontium dichloride 
B)  Strontium dichlorine 
C)  Strontium(III) dichloride 
D)  Strontium chloride 
E)  Iodine strontide

Question 2

A certain element consists of two stable isotopes. The first has a mass of 14.0031 amu and a percent natural abundance of 99.63%. The second has a mass of 15.001 amu and a percent natural abundance of 0.37%. What is the atomic weight of the element?

Accepted Answer

A)  13.95 amu 
B)  14.00 amu 
C)  14.01 amu 
D)  14.50 amu 
E)  19.50 amu 
A)  13.95 amu 
B)  14.00 amu 
C)  14.01 amu 
D)  14.50 amu 
E)  19.50 amu

Question 3

One atomic mass unit is equal to one-twelfth of the mass of an atom of _____.

Accepted Answer

A)  carbon with six protons and six neutrons 
B)  hydrogen with one proton and one neutron 
C)  oxygen with eight protons and eight neutrons 
D)  sodium with 11 atoms and 12 neutrons 
E)  magnesium with 12 atoms and 12 neutrons 
A)  carbon with six protons and six neutrons 
B)  hydrogen with one proton and one neutron 
C)  oxygen with eight protons and eight neutrons 
D)  sodium with 11 atoms and 12 neutrons 
E)  magnesium with 12 atoms and 12 neutrons

Question 4

Which of the following elements is not a metalloid?

Accepted Answer

A)  Boron 
B)  Selenium 
C)  Germanium 
D)  Arsenic 
E)  Silicon 
A)  Boron 
B)  Selenium 
C)  Germanium 
D)  Arsenic 
E)  Silicon

Question 5

A sample of an element consists of two isotopes. The percent abundance of one of the isotopes is 75.0%. What is the percent abundance of the other isotope?

Accepted Answer

A)  62.5% 
B)  37.5% 
C)  12.5% 
D)  75.0% 
E)  25.0% 
A)  62.5% 
B)  37.5% 
C)  12.5% 
D)  75.0% 
E)  25.0%

Question 6

Which of the following is the correct formula for an ionic compound that contains barium ions and carbonate ions?

Accepted Answer

A)  BaCO3 
B)  Ba(HCO3)2 
C)  Ba2CO3 
D)  Ba2C 
E)  Ba(CO3)2 
A)  BaCO3 
B)  Ba(HCO3)2 
C)  Ba2CO3 
D)  Ba2C 
E)  Ba(CO3)2

Question 7

What is the charge on the sodium ion in Na3P?

Accepted Answer

A)  3- 
B)  1- 
C)  0 
D)  1+ 
E)  3+ 
A)  3- 
B)  1- 
C)  0 
D)  1+ 
E)  3+

Question 8

The fully hydrated form of sodium sulfate is the decahydrate, Na2SO4⋅10H2O. This compound dehydrates (loses some waters of hydration) when heated. A sample of partially dehydrated sodium sulfate was found to have a molar mass of 232 g/mol. How many water molecules are found per formula unit in in this sample? (Determine n in Na2SO4⋅ nH2O).

Accepted Answer

A)  5 molecules of water 
B)  8 molecules of water 
C)  10 molecules of water 
D)  6 molecules of water 
E)  1 molecules of water 
A)  5 molecules of water 
B)  8 molecules of water 
C)  10 molecules of water 
D)  6 molecules of water 
E)  1 molecules of water

Question 9

Determine the empirical formula of an oxide of nitrogen that contains 46.67 % nitrogen by mass.

Accepted Answer

A)  N2O5 
B)  N 
C)  N2O 
D)  N22 
E)  NO 
A)  N2O5 
B)  N 
C)  N2O 
D)  N22 
E)  NO

Question 10

The numerical quantity of a mole, 6.022 × 1023, is defined as the number of atoms in a specific mass of an element. What is the mass and the identity of the element used to define one mole?

Accepted Answer

A mole is equal to t

Question 11

The building blocks of atoms (neutrons, protons, and electrons) are called _____ particles.

Accepted Answer

The answer of The building blocks of atoms (neutrons, protons,...

Question 12

An atom that has the same number of neutrons as nickel-59 is _____.

Accepted Answer

A)  ${ } ^ { 58 } \mathrm { Zn }$ 
B)  ${ } ^ { 58 } \mathrm { Co }$ 
C)  ${ } ^ { 57 } \mathrm { Cr }$ 
D)  ${ } ^ { 58 } \mathrm { Mn }$ 
E)  ${ } ^ { 59 } \mathrm { Zn }$ 
A)  ${ } ^ { 58 } \mathrm { Zn }$ 
B)  ${ } ^ { 58 } \mathrm { Co }$ 
C)  ${ } ^ { 57 } \mathrm { Cr }$ 
D)  ${ } ^ { 58 } \mathrm { Mn }$ 
E)  ${ } ^ { 59 } \mathrm { Zn }$

Question 13

What is the symbol for an ion of an element that has 12 protons and 10 electrons?

Accepted Answer

A)  Mg2+ 
B)  Mg2- 
C)  Ne2+ 
D)  Ne2- 
E)  Ti2+ 
A)  Mg2+ 
B)  Mg2- 
C)  Ne2+ 
D)  Ne2- 
E)  Ti2+

Question 14

An ionic compound has the formula MCl2. The mass of 0.3011 mol of the compound is 62.69 grams. What is the identity of the metal?

Accepted Answer

A)  Nickel (Ni) 
B)  Copper (Cu) 
C)  Tin (Sn) 
D)  Mercury (Hg) 
E)  Barium (Ba) 
A)  Nickel (Ni) 
B)  Copper (Cu) 
C)  Tin (Sn) 
D)  Mercury (Hg) 
E)  Barium (Ba)

Question 15

How many protons are there in an atom of scandium-45?

Accepted Answer

A)  25 
B)  66 
C)  20 
D)  21 
E)  24 
A)  25 
B)  66 
C)  20 
D)  21 
E)  24

Question 16

Which of the following elements belongs to the alkaline earth metals series?

Accepted Answer

A)  Barium 
B)  Potassium 
C)  phosphorus 
D)  Bromine 
E)  Argon 
A)  Barium 
B)  Potassium 
C)  phosphorus 
D)  Bromine 
E)  Argon

Question 17

Calculate the number of moles of aluminum oxide in 6.83 g of Al2O3.

Accepted Answer

A)  6.70 × 10-2 mol 
B)  6.96 × 102 mol 
C)  0.253 mol 
D)  0.127 mol 
E)  1.56 × 10-3 mol 
A)  6.70 × 10-2 mol 
B)  6.96 × 102 mol 
C)  0.253 mol 
D)  0.127 mol 
E)  1.56 × 10-3 mol

Question 18

The mass spectrum of an element with two naturally occurring isotopes is shown below. What is the best estimate of the element's (average) atomic weight?

Accepted Answer

A)  10 amu 
B)  11 amu 
C)  10.8 amu 
D)  10.2 amu 
E)  10.5 amu 
A)  10 amu 
B)  11 amu 
C)  10.8 amu 
D)  10.2 amu 
E)  10.5 amu

Question 19

Which of the following is the correct molar mass of calcium chloride hexahydrate?

Accepted Answer

A)  75.53 g/mol 
B)  111.0 g/mol 
C)  117.0 g/mol 
D)  183.6 g/mol 
E)  219.1 g/mol 
A)  75.53 g/mol 
B)  111.0 g/mol 
C)  117.0 g/mol 
D)  183.6 g/mol 
E)  219.1 g/mol

Question 20

For a nonmetal in Group 6A of the periodic table, the most common monatomic ion will have a charge of _____.

Accepted Answer

A)  3- 
B)  2- 
C)  1- 
D)  1+ 
E)  2+ 
A)  3- 
B)  2- 
C)  1- 
D)  1+ 
E)  2+

Exam 3: Atoms, Molecules, and Ions

Which of the following is the correct name for the compound SrCl2?

A certain element consists of two stable isotopes. The first has a mass of 14.0031 amu and a percent natural abundance of 99.63%. The second has a mass of 15.001 amu and a percent natural abundance of 0.37%. What is the atomic weight of the element?

One atomic mass unit is equal to one-twelfth of the mass of an atom of _____.

Which of the following elements is not a metalloid?

A sample of an element consists of two isotopes. The percent abundance of one of the isotopes is 75.0%. What is the percent abundance of the other isotope?

Which of the following is the correct formula for an ionic compound that contains barium ions and carbonate ions?

What is the charge on the sodium ion in Na3P?

Determine the empirical formula of an oxide of nitrogen that contains 46.67 % nitrogen by mass.

The numerical quantity of a mole, 6.022 × 1023, is defined as the number of atoms in a specific mass of an element. What is the mass and the identity of the element used to define one mole?

The building blocks of atoms (neutrons, protons, and electrons) are called _____ particles.

An atom that has the same number of neutrons as nickel-59 is _____.

What is the symbol for an ion of an element that has 12 protons and 10 electrons?

An ionic compound has the formula MCl2. The mass of 0.3011 mol of the compound is 62.69 grams. What is the identity of the metal?

How many protons are there in an atom of scandium-45?

Which of the following elements belongs to the alkaline earth metals series?

Calculate the number of moles of aluminum oxide in 6.83 g of Al2O3.

The mass spectrum of an element with two naturally occurring isotopes is shown below. What is the best estimate of the element's (average) atomic weight?

Which of the following is the correct molar mass of calcium chloride hexahydrate?

For a nonmetal in Group 6A of the periodic table, the most common monatomic ion will have a charge of _____.

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

What is the charge on the sodium ion in Na₃P?

The numerical quantity of a mole, 6.022 × 10²³, is defined as the number of atoms in a specific mass of an element. What is the mass and the identity of the element used to define one mole?

An ionic compound has the formula MCl₂. The mass of 0.3011 mol of the compound is 62.69 grams. What is the identity of the metal?

Calculate the number of moles of aluminum oxide in 6.83 g of Al₂O₃.