Question 1

Identify the ions and their charges in Na2SO4.

Accepted Answer

A)  Na+,SO4− 
B)  Na+,SO42− 
C)  Na+,SO4− 
D)  Na2+,SO4− 
E)  Na2+,SO42− 
A)  Na+,SO4− 
B)  Na+,SO42− 
C)  Na+,SO4− 
D)  Na2+,SO4− 
E)  Na2+,SO42−

Question 2

All of the following statements are true EXCEPT

Accepted Answer

A)  all atoms of a given element have the same mass number. 
B)  for any neutral element,the number of electrons is equal to the number of protons. 
C)  the mass number is the sum of the number of protons and neutrons. 
D)  isotopes of atoms contain the same number of protons but a different number of neutrons. 
E)  the atomic number equals the number of protons in an atom. 
A)  all atoms of a given element have the same mass number. 
B)  for any neutral element,the number of electrons is equal to the number of protons. 
C)  the mass number is the sum of the number of protons and neutrons. 
D)  isotopes of atoms contain the same number of protons but a different number of neutrons. 
E)  the atomic number equals the number of protons in an atom.

Question 3

Of the naturally occurring elements in group 14,how many are nonmetals,metalloids,and metals?

Accepted Answer

A)  0 nonmetals,3 metalloids,and 2 metals 
B)  1 nonmetal,2 metalloids,and 2 metals 
C)  2 nonmetals,2 metalloids,and 1 metal 
D)  2 nonmetals,1 metalloid,and 2 metals 
E)  3 nonmetals,0 metalloids,and 2 metals 
A)  0 nonmetals,3 metalloids,and 2 metals 
B)  1 nonmetal,2 metalloids,and 2 metals 
C)  2 nonmetals,2 metalloids,and 1 metal 
D)  2 nonmetals,1 metalloid,and 2 metals 
E)  3 nonmetals,0 metalloids,and 2 metals

Question 4

What is the correct name for H2SO4(aq)?

Accepted Answer

A)  sulfuric acid 
B)  sulfide acid 
C)  sulfurous acid 
D)  hydrogen sulfate acid 
E)  hydrogen sulfide acid 
A)  sulfuric acid 
B)  sulfide acid 
C)  sulfurous acid 
D)  hydrogen sulfate acid 
E)  hydrogen sulfide acid

Question 5

What is the correct formula for sulfur dichloride?

Accepted Answer

A)  SCl 
B)  SCl2 
C)  S2Cl 
D)  S2Cl2 
E)  S4Cl2 
A)  SCl 
B)  SCl2 
C)  S2Cl 
D)  S2Cl2 
E)  S4Cl2

Question 6

What is the identity of ${ }_{25}^{55} \mathrm{X}$ ?

Accepted Answer

A)  zinc 
B)  silver 
C)  iridium 
D)  cesium 
E)  manganese 
A)  zinc 
B)  silver 
C)  iridium 
D)  cesium 
E)  manganese

Question 7

What is the correct name for N2O3?

Accepted Answer

A)  nitrogen oxide 
B)  nitrogen(II)oxide 
C)  nitrogen(III)oxide 
D)  trioxygen dinitride 
E)  dinitrogen trioxide 
A)  nitrogen oxide 
B)  nitrogen(II)oxide 
C)  nitrogen(III)oxide 
D)  trioxygen dinitride 
E)  dinitrogen trioxide

Question 8

Group 1 elements are also known as

Accepted Answer

A)  alkaline earth metals. 
B)  alkali metals. 
C)  chalcogens. 
D)  halogens. 
E)  noble gases. 
A)  alkaline earth metals. 
B)  alkali metals. 
C)  chalcogens. 
D)  halogens. 
E)  noble gases.

Question 9

Which of the following atoms contains the fewest protons?

Accepted Answer

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

Question 10

Using the laws of constant composition and the conservation of mass,complete the molecular picture of hydrogen molecules (circles)reacting with chlorine molecules (squares)to give hydrogen chloride (HCl).

Accepted Answer

A)    
B)    
C)    
D)    
E)  None of these are correct. 
A)    
B)    
C)    
D)    
E)  None of these are correct.

Question 11

Sodium sulfate has the chemical formula Na2SO4.Based on this information,the formula for chromium(III)sulfate is ____.

Accepted Answer

A)  CrSO4 
B)  Cr(SO4)3 
C)  Cr2(SO4)3 
D)  Cr2SO4 
E)  Cr3(SO4)2 
A)  CrSO4 
B)  Cr(SO4)3 
C)  Cr2(SO4)3 
D)  Cr2SO4 
E)  Cr3(SO4)2

Question 12

What is the correct formula for aluminum selenide?

Accepted Answer

A)  AlSe 
B)  AlSe2 
C)  Al2Se 
D)  Al2Se3 
E)  Al3Se2 
A)  AlSe 
B)  AlSe2 
C)  Al2Se 
D)  Al2Se3 
E)  Al3Se2

Question 13

Which of the following is a nonelectrolyte in water?

Accepted Answer

A)  NaCl 
B)  SF6 
C)  KNO3 
D)  MgS 
E)  NH4Cl 
A)  NaCl 
B)  SF6 
C)  KNO3 
D)  MgS 
E)  NH4Cl

Question 14

The average molar mass of lithium is 6.941.A sample of lithium consists of two isotopes with masses of 6.01512 amu and 7.01600 amu.Determine the percent abundance of each isotope.

Accepted Answer

A)  7.49% Li-6 and 92.51% Li-7 
B)  8.45% Li-6 and 91.55% Li-7 
C)  12.49% Li-6 and 87.51% Li-7 
D)  91.55% Li-6 and 8.45% Li-7 
E)  92.51% Li-6 and 7.49% Li-7 
A)  7.49% Li-6 and 92.51% Li-7 
B)  8.45% Li-6 and 91.55% Li-7 
C)  12.49% Li-6 and 87.51% Li-7 
D)  91.55% Li-6 and 8.45% Li-7 
E)  92.51% Li-6 and 7.49% Li-7

Question 15

Which element is most likely to form an ion with a −2 charge?

Accepted Answer

A)  K 
B)  Mg 
C)  P 
D)  Br 
E)  S 
A)  K 
B)  Mg 
C)  P 
D)  Br 
E)  S

Question 16

What is the symbol for an element which contains 57 neutrons and has a mass number of 101?

Accepted Answer

A)  Er 
B)  Ru 
C)  Md 
D)  La 
E)  Os 
A)  Er 
B)  Ru 
C)  Md 
D)  La 
E)  Os

Question 17

Two isotopes of chlorine are found in nature,Cl-35 and Cl-37.The average mass of chlorine is 35.45 amu.The more abundant isotope of Cl has

Accepted Answer

A)  17 protons,17 electrons,and 18 neutrons. 
B)  17 protons,17 electrons,and 18.45 neutrons. 
C)  17 protons,17 electrons,and 20 neutrons. 
D)  18 protons,18 electrons,and 17 neutrons. 
E)  19 protons,19 electrons,and 16 neutrons. 
A)  17 protons,17 electrons,and 18 neutrons. 
B)  17 protons,17 electrons,and 18.45 neutrons. 
C)  17 protons,17 electrons,and 20 neutrons. 
D)  18 protons,18 electrons,and 17 neutrons. 
E)  19 protons,19 electrons,and 16 neutrons.

Question 18

What element is in the fourth period in Group 3A?

Accepted Answer

A)  Sb 
B)  Ga 
C)  In 
D)  Si 
E)  Tl 
A)  Sb 
B)  Ga 
C)  In 
D)  Si 
E)  Tl

Question 19

For a nonmetal in Group 16 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)  +3 
A)  -3 
B)  -2 
C)  -1 
D)  +1 
E)  +3

Exam 2: Atoms, molecules, and Ions

Identify the ions and their charges in Na2SO4.

All of the following statements are true EXCEPT

Of the naturally occurring elements in group 14,how many are nonmetals,metalloids,and metals?

What is the correct name for H2SO4(aq)?

What is the correct formula for sulfur dichloride?

What is the identity of 2555X{ }_{25}^{55} \mathrm{X}2555​X ?

What is the correct name for N2O3?

Group 1 elements are also known as

Which of the following atoms contains the fewest protons?

Using the laws of constant composition and the conservation of mass,complete the molecular picture of hydrogen molecules (circles)reacting with chlorine molecules (squares)to give hydrogen chloride (HCl).

Sodium sulfate has the chemical formula Na2SO4.Based on this information,the formula for chromium(III)sulfate is ____.

What is the correct formula for aluminum selenide?

Which of the following is a nonelectrolyte in water?

The average molar mass of lithium is 6.941.A sample of lithium consists of two isotopes with masses of 6.01512 amu and 7.01600 amu.Determine the percent abundance of each isotope.

Which element is most likely to form an ion with a −2 charge?

What is the symbol for an element which contains 57 neutrons and has a mass number of 101?

Two isotopes of chlorine are found in nature,Cl-35 and Cl-37.The average mass of chlorine is 35.45 amu.The more abundant isotope of Cl has

What element is in the fourth period in Group 3A?

For a nonmetal in Group 16 of the periodic table,the most common monatomic ion will have a charge of ____.

Matter and Measurements

Mass Relations in Chemistry;stoichiometry

Reactions in Aqueous Solution

Gases

Electronic Structure and the Periodic Table

Covalent Bonding

Thermochemistry

Liquids and Solids

Solutions

Rate of Reaction

Gaseous Chemical Equilibrium

Acids and Bases

Equilibria in Acid-Base Solutions

Complex Ion and Precipitation Equilibria

Spontaneity of Reaction

Electrochemistry

Nuclear Reactions

Complex Ions

Chemistry of the Metals

Chemistry of the Nonmetals

Organic Chemistry

Organic Polymers, natural and Synthetic

Filters

Identify the ions and their charges in Na₂SO₄.

What is the correct name for H₂SO₄(aq)?

What is the identity of ${ }_{25}^{55} \mathrm{X}$ ?

What is the correct name for N₂O₃?

Sodium sulfate has the chemical formula Na₂SO₄.Based on this information,the formula for chromium(III)sulfate is ____.