Question 1

Which compound contains a central atom with an exception to the octet rule known as an expanded octet?

Accepted Answer

A) BeH2 
B) NO 
C) PF5 
D) CH4 
E) BF3 
A) BeH2 
B) NO 
C) PF5 
D) CH4 
E) BF3

Question 2

The hydrogen bonds between water and ammonia in a solution are intermolecular forces.

Accepted Answer

A) True 
 B)False

Question 3

The existence of resonance makes a molecule less stable than would otherwise be the case.

Accepted Answer

A) True 
 B)False

Question 4

Resonance occurs when two or more different,valid Lewis structures can be drawn for a molecule.

Accepted Answer

A) True 
 B)False

Question 5

Vehicle airbags inflate when the ionic compound sodium azide rapidly decomposes to the elements sodium and nitrogen.If the azide ion is a polyatomic ion with the formula N3−,what is the formula of sodium azide?

Accepted Answer

A) NaN3 
B) Na3N3 
C) Na3(N3)3 
D) Na3N 
E) Na(N3)3 
A) NaN3 
B) Na3N3 
C) Na3(N3)3 
D) Na3N 
E) Na(N3)3

Question 6

Which statement about general bonding characteristics is FALSE?

Accepted Answer

A) Bond energy is the amount of energy required to break a bond holding two atoms together. 
B) Bond length is the distance of separation of two nuclei in a covalent bond. 
C) Triple bonds have higher bond energies than double bonds. 
D) Single bonds are easier to break than double bonds. 
E) A triple bond is longer than a single bond. 
A) Bond energy is the amount of energy required to break a bond holding two atoms together. 
B) Bond length is the distance of separation of two nuclei in a covalent bond. 
C) Triple bonds have higher bond energies than double bonds. 
D) Single bonds are easier to break than double bonds. 
E) A triple bond is longer than a single bond.

Question 7

Which of the following is an essential feature of ionic bonding?

Accepted Answer

A) Elements with high ionization energy form bonds with elements with high electron affinity. 
B) Elements with high ionization energy form bonds with elements with low electron affinity. 
C) Elements with low ionization energy form bonds with elements with low electron affinity. 
D) Elements with low ionization energy form bonds with elements with high electron affinity. 
E) The ionization and electron affinity of elements does not determine bonding. 
A) Elements with high ionization energy form bonds with elements with high electron affinity. 
B) Elements with high ionization energy form bonds with elements with low electron affinity. 
C) Elements with low ionization energy form bonds with elements with low electron affinity. 
D) Elements with low ionization energy form bonds with elements with high electron affinity. 
E) The ionization and electron affinity of elements does not determine bonding.

Question 8

Which statement about compounds is FALSE?

Accepted Answer

A) Compounds consist of atoms of two or more different elements that are chemically bonded together. 
B) The elements in a compound cannot be separated or recovered by a physical process. 
C) Ionic compounds are composed of cations and anions. 
D) Covalent compounds are composed of metals and nonmetals. 
E) Intermolecular forces are attractive forces between molecules of a compound,and are responsible for the compound?s physical properties. 
A) Compounds consist of atoms of two or more different elements that are chemically bonded together. 
B) The elements in a compound cannot be separated or recovered by a physical process. 
C) Ionic compounds are composed of cations and anions. 
D) Covalent compounds are composed of metals and nonmetals. 
E) Intermolecular forces are attractive forces between molecules of a compound,and are responsible for the compound?s physical properties.

Question 9

Assuming reactions between the following pairs of elements,which pair is most likely to form an ionic compound?

Accepted Answer

A) copper and tin 
B) chlorine and oxygen 
C) cesium and iodine 
D) carbon and chlorine 
E) fluorine and iodine 
A) copper and tin 
B) chlorine and oxygen 
C) cesium and iodine 
D) carbon and chlorine 
E) fluorine and iodine

Question 10

What is the proper name for Mg(CN)2?

Accepted Answer

A) manganese carbon nitride 
B) manganese dicyanide 
C) magnesium dicarbon dinitride 
D) magnesium(II)dicyanide 
E) magnesium cyanide 
A) manganese carbon nitride 
B) manganese dicyanide 
C) magnesium dicarbon dinitride 
D) magnesium(II)dicyanide 
E) magnesium cyanide

Question 11

Ionic solids are amorphous.

Accepted Answer

A) True 
 B)False

Question 12

Formaldehyde is a covalent compound used as a preservative for biological specimens.Which statement concerning the Lewis structure of formaldehyde,shown below,is FALSE?

Accepted Answer

A) Four electrons are being shared between the carbon and oxygen atoms. 
B) The oxygen atom has four valence electrons that are not being shared. 
C) The oxygen and carbon atoms each have an octet of electrons in their valence shells. 
D) The hydrogen atoms have incomplete valence shells. 
E) There are a total of 12 valence electrons in formaldehyde. 
A) Four electrons are being shared between the carbon and oxygen atoms. 
B) The oxygen atom has four valence electrons that are not being shared. 
C) The oxygen and carbon atoms each have an octet of electrons in their valence shells. 
D) The hydrogen atoms have incomplete valence shells. 
E) There are a total of 12 valence electrons in formaldehyde.

Question 13

How many total valence electrons are in SO42- ?

Accepted Answer

A) 2 
B) 64 
C) 32 
D) 12 
E) 16 
A) 2 
B) 64 
C) 32 
D) 12 
E) 16

Question 14

Which combination of atoms is most likely to form an ionic compound if they are allowed to react with each other?

Accepted Answer

A) metal and metal 
B) metal and nonmetal 
C) nonmetal and nonmetal 
D) metalloid and metalloid 
E) All combinations are likely to form an ionic compound. 
A) metal and metal 
B) metal and nonmetal 
C) nonmetal and nonmetal 
D) metalloid and metalloid 
E) All combinations are likely to form an ionic compound.

Question 15

Which Lewis symbol for an ion is incorrect?

Accepted Answer

A) Na+ 
B) Ca2+ 
C) Sn4+ 
D) 
  
E) 
  
A) Na+ 
B) Ca2+ 
C) Sn4+ 
D) 
  
E)

Question 16

What is the formula of the ionic compound sodium carbonate?

Accepted Answer

A) NaCO2 
B) Na2CO2 
C) Na2CO3 
D) Na(CO3)2 
E) Na3CO3 
A) NaCO2 
B) Na2CO2 
C) Na2CO3 
D) Na(CO3)2 
E) Na3CO3

Question 17

In determining properties such as solubility,melting point,and boiling point,intramolecular forces are more important than intermolecular forces.

Accepted Answer

A) True 
 B)False

Question 18

The ionic compound iron(II)sulfate is used in iron-containing supplements.What does the (II)in the name of this compound specifically indicate?

Accepted Answer

A) There are two iron ions in this compound. 
B) The charge on the iron ion is 2+. 
C) The charge on the sulfate ion is 2−. 
D) Iron has two valence electrons. 
E) There are two sulfate ions in this compound. 
A) There are two iron ions in this compound. 
B) The charge on the iron ion is 2+. 
C) The charge on the sulfate ion is 2−. 
D) Iron has two valence electrons. 
E) There are two sulfate ions in this compound.

Question 19

In Lewis symbols,the chemical symbol of an element represents both the nucleus and the lower energy (nonvalence)electrons.

Accepted Answer

A) True 
 B)False

Question 20

What is the name of the compound whose formula is CCl4?

Accepted Answer

A) carbon tetrachloride 
B) carbon(IV)chloride 
C) carbon chloride 
D) carbotetrachloride 
E) carbonate tetrachloride 
A) carbon tetrachloride 
B) carbon(IV)chloride 
C) carbon chloride 
D) carbotetrachloride 
E) carbonate tetrachloride

Exam 3: Structure and Properties of Ionic and Covalent Compounds

Which compound contains a central atom with an exception to the octet rule known as an expanded octet?

The hydrogen bonds between water and ammonia in a solution are intermolecular forces.

The existence of resonance makes a molecule less stable than would otherwise be the case.

Resonance occurs when two or more different,valid Lewis structures can be drawn for a molecule.

Vehicle airbags inflate when the ionic compound sodium azide rapidly decomposes to the elements sodium and nitrogen.If the azide ion is a polyatomic ion with the formula N3−,what is the formula of sodium azide?

Which statement about general bonding characteristics is FALSE?

Which of the following is an essential feature of ionic bonding?

Which statement about compounds is FALSE?

Assuming reactions between the following pairs of elements,which pair is most likely to form an ionic compound?

What is the proper name for Mg(CN)2?

Ionic solids are amorphous.

Formaldehyde is a covalent compound used as a preservative for biological specimens.Which statement concerning the Lewis structure of formaldehyde,shown below,is FALSE?

How many total valence electrons are in SO42- ?

Which combination of atoms is most likely to form an ionic compound if they are allowed to react with each other?

Which Lewis symbol for an ion is incorrect?

What is the formula of the ionic compound sodium carbonate?

In determining properties such as solubility,melting point,and boiling point,intramolecular forces are more important than intermolecular forces.

The ionic compound iron(II)sulfate is used in iron-containing supplements.What does the (II)in the name of this compound specifically indicate?

In Lewis symbols,the chemical symbol of an element represents both the nucleus and the lower energy (nonvalence)electrons.

What is the name of the compound whose formula is CCl4?

Chemistry - Methods and Measurement

The Structure of the Atom and the Periodic Table

Calculations, chemical Changes, and the Chemical Equation

States of Matter: Gases, liquids, and Solids

Solutions

Energy,rate and Equilibrium

Acids and Bases

The Nucleus, radioactivity, and Nuclear Medicine

An Introduction to Organic Chemistry

The Unsaturated Hydrocarbons: Alkenes, alkynes, and Aromatics

Alcohols, phenols, thiols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Carboxylic Acid Derivatives

Amines and Amides

Carbohydrates

Lipids and Their Functions in Biochemical Systems

Protein Structure and Function

Enzymes

Introduction to Molecular Genetics

Carbohydrate Metabolism

Aerobic Respiration and Energy Production

Fatty Acid Metabolism

Filters

What is the proper name for Mg(CN)₂?

How many total valence electrons are in SO₄^2- ?

What is the name of the compound whose formula is CCl₄?