Question 1

Identify the compound with the lowest magnitude of lattice energy.

Accepted Answer

A)  KCl 
B)  KBr 
C)  Mg S 
D)  Ba S 
A)  KCl 
B)  KBr 
C)  Mg S 
D)  Ba S

Question 2

Which of the following reactions is associated with the lattice energy of RbI (ΔH°latt)?

Accepted Answer

A)  Rb(s) +   I2(g) → RbI(s) 
B)  RbI(s) → Rb⁺(g) + I⁻(g) 
C)  RbI(s) → Rb(s) +   I2(g) 
D)  RbI(s) → Rb⁺(aq) + I⁻(aq) 
E)  Rb⁺(g) + I⁻(g) → RbI(s) 
A)  Rb(s) +   I2(g) → RbI(s) 
B)  RbI(s) → Rb⁺(g) + I⁻(g) 
C)  RbI(s) → Rb(s) +   I2(g) 
D)  RbI(s) → Rb⁺(aq) + I⁻(aq) 
E)  Rb⁺(g) + I⁻(g) → RbI(s)

Question 3

Which of the following elements has the least tendency to form an ion?

Accepted Answer

A)  Ac 
B)  Al 
C)  Ar 
D)  As 
A)  Ac 
B)  Al 
C)  Ar 
D)  As

Question 4

Which of the compounds C3H8,Mg Cl2,Zn(NO3)2,O Cl2 are expected to exist as molecules?

Accepted Answer

A)  only C3H8 
B)  C3H8 and O Cl2 
C)  C3H8, Zn(NO3)2, and O Cl2 
D)  Mg Cl2 and Zn(NO3)2 
A)  only C3H8 
B)  C3H8 and O Cl2 
C)  C3H8, Zn(NO3)2, and O Cl2 
D)  Mg Cl2 and Zn(NO3)2

Question 5

Which of the following contains BOTH ionic and covalent bonds?

Accepted Answer

A)  CaBr2 
B)  COS 
C)  BaSO4 
D)  SF6 
E)  None of the above contain both ionic and covalent bonds. 
A)  CaBr2 
B)  COS 
C)  BaSO4 
D)  SF6 
E)  None of the above contain both ionic and covalent bonds.

Question 6

Write the formula for calcium nitride.

Accepted Answer

A)  Ca3N2 
B)  Ca(NO3)2 
C)  CaN 
D)  Ca2N3 
E)  Ca(NO2)2 
A)  Ca3N2 
B)  Ca(NO3)2 
C)  CaN 
D)  Ca2N3 
E)  Ca(NO2)2

Question 7

Combustion analysis of 0.600 g of an unknown compound containing carbon,hydrogen,and oxygen produced 1.043 g of CO2 and 0.5670 g of H2O.What is the empirical formula of the compound?

Accepted Answer

A)  C2H5O 
B)  C2H5O2 
C)  C2H10O3 
D)  C3H8O2 
A)  C2H5O 
B)  C2H5O2 
C)  C2H10O3 
D)  C3H8O2

Question 8

Determine the molecular formula of a compound that is 49.48% carbon,5.19% hydrogen,28.85% nitrogen,and 16.48% oxygen.The molecular weight is 194.19 g/mol.

Accepted Answer

A)  C8H12N4O2 
B)  C4H5N2O 
C)  C8H10N4O2 
D)  C8H10N2O 
A)  C8H12N4O2 
B)  C4H5N2O 
C)  C8H10N4O2 
D)  C8H10N2O

Question 9

Which of the following is an ionic compound?

Accepted Answer

A)  LiBr 
B)  CO2 
C)  P Cl3 
D)  C Cl4 
E)  SeBr2 
A)  LiBr 
B)  CO2 
C)  P Cl3 
D)  C Cl4 
E)  SeBr2

Question 10

How many cations are there in 30.0 g of sodium phosphate?

Accepted Answer

A)  1.10 × 1023 cations 
B)  3.31 × 1023 cations 
C)  3.29 × 1024 cations 
D)  9.87 × 1024 cations 
A)  1.10 × 1023 cations 
B)  3.31 × 1023 cations 
C)  3.29 × 1024 cations 
D)  9.87 × 1024 cations

Question 11

What mass of xenon tetrafluoride,XeF4,has the same number of fluorine atoms as 25.0 g of oxygen difluoride,OF2?

Accepted Answer

A)  1.92 g 
B)  12.5 g 
C)  48.0 g 
D)  192 g 
A)  1.92 g 
B)  12.5 g 
C)  48.0 g 
D)  192 g

Question 12

Determine the name for N2O5.

Accepted Answer

A)  dinitrogen pentoxide 
B)  nitrogen oxide 
C)  nitrogen (IV) oxide 
D)  nitrogen (II) oxide 
E)  nitrogen tetroxide 
A)  dinitrogen pentoxide 
B)  nitrogen oxide 
C)  nitrogen (IV) oxide 
D)  nitrogen (II) oxide 
E)  nitrogen tetroxide

Question 13

Why aren't prefixes used in naming ionic compounds?

Accepted Answer

The charges on the ions dictat

Question 14

Give the formula for ferrous nitrate.

Accepted Answer

A)  Fe(NO2)3 
B)  Fe(NO3)3 
C)  Fe(NO3)2 
D)  Fe(NO2)2 
E)  Fe2(NO2) 
A)  Fe(NO2)3 
B)  Fe(NO3)3 
C)  Fe(NO3)2 
D)  Fe(NO2)2 
E)  Fe2(NO2)

Question 15

What is the mass of 9.00 × 1022 molecules of NH3?

Accepted Answer

A)  0.00 878 g 
B)  0. 393 g 
C)  2. 55 g 
D)  114 g 
A)  0.00 878 g 
B)  0. 393 g 
C)  2. 55 g 
D)  114 g

Question 16

Identify the compound with ionic bonding.

Accepted Answer

A)  Na F 
B)  K 
C)  H2O 
D)  He 
E)  S 
A)  Na F 
B)  K 
C)  H2O 
D)  He 
E)  S

Question 17

How many oxygen atoms are there in 3.00 g of sodium dichromate,Na2Cr2O7?

Accepted Answer

A)  0. 0802 oxygen atoms 
B)  9.85 × 1020 oxygen atoms 
C)  6.90 × 1021 oxygen atoms 
D)  4.83 × 1022 oxygen atoms 
A)  0. 0802 oxygen atoms 
B)  9.85 × 1020 oxygen atoms 
C)  6.90 × 1021 oxygen atoms 
D)  4.83 × 1022 oxygen atoms

Question 18

Place the following in order of decreasing magnitude of lattice energy. KF Mg S RbI

Accepted Answer

A)  RbI > KF > Mg S 
B)  RbI > Mg S > KF 
C)  Mg S > RbI > KF 
D)  KF > RbI > Mg S 
E)  Mg S > KF > RbI 
A)  RbI > KF > Mg S 
B)  RbI > Mg S > KF 
C)  Mg S > RbI > KF 
D)  KF > RbI > Mg S 
E)  Mg S > KF > RbI

Question 19

Use Lewis theory to determine the chemical formula for the compound formed between Na and Br.

Accepted Answer

A)  Na Br2 
B)  Na 2Br 
C)  Na Br 
D)  Na 2Br2 
A)  Na Br2 
B)  Na 2Br 
C)  Na Br 
D)  Na 2Br2

Question 20

An ionic bond is best described as

Accepted Answer

A)  the sharing of electrons. 
B)  the transfer of electrons from one atom to another. 
C)  the attraction that holds the atoms together in a polyatomic ion. 
D)  the attraction between 2 nonmetal atoms. 
E)  the attraction between 2 metal atoms. 
A)  the sharing of electrons. 
B)  the transfer of electrons from one atom to another. 
C)  the attraction that holds the atoms together in a polyatomic ion. 
D)  the attraction between 2 nonmetal atoms. 
E)  the attraction between 2 metal atoms.

Exam 5: Molecules and Compounds

Identify the compound with the lowest magnitude of lattice energy.

Which of the following reactions is associated with the lattice energy of RbI (ΔH°latt)?

Which of the following elements has the least tendency to form an ion?

Which of the compounds C3H8,Mg Cl2,Zn(NO3)2,O Cl2 are expected to exist as molecules?

Which of the following contains BOTH ionic and covalent bonds?

Write the formula for calcium nitride.

Combustion analysis of 0.600 g of an unknown compound containing carbon,hydrogen,and oxygen produced 1.043 g of CO2 and 0.5670 g of H2O.What is the empirical formula of the compound?

Determine the molecular formula of a compound that is 49.48% carbon,5.19% hydrogen,28.85% nitrogen,and 16.48% oxygen.The molecular weight is 194.19 g/mol.

Which of the following is an ionic compound?

How many cations are there in 30.0 g of sodium phosphate?

What mass of xenon tetrafluoride,XeF4,has the same number of fluorine atoms as 25.0 g of oxygen difluoride,OF2?

Determine the name for N2O5.

Why aren't prefixes used in naming ionic compounds?

Give the formula for ferrous nitrate.

What is the mass of 9.00 × 1022 molecules of NH3?

Identify the compound with ionic bonding.

How many oxygen atoms are there in 3.00 g of sodium dichromate,Na2Cr2O7?

Place the following in order of decreasing magnitude of lattice energy. KF Mg S RbI

Use Lewis theory to determine the chemical formula for the compound formed between Na and Br.

An ionic bond is best described as

Essentials: Units, Measurements, and Problem Solving

Atoms

The Quantum Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I

Chemical Bonding Ii

Chemical Reactions and Chemical Quantities

Introduction to Solutions and Aqueous Reactions

Thermochemistry

Gases

Liquids, Solids, and Intermolecular Forces

Crystalline Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Transition Metals and Coordination Compounds

Filters

Which of the following reactions is associated with the lattice energy of RbI (ΔH°_latt)?

Which of the compounds C₃H₈,Mg Cl₂,Zn(NO₃)₂,O Cl₂ are expected to exist as molecules?

Combustion analysis of 0.600 g of an unknown compound containing carbon,hydrogen,and oxygen produced 1.043 g of CO₂ and 0.5670 g of H₂O.What is the empirical formula of the compound?

What mass of xenon tetrafluoride,XeF₄,has the same number of fluorine atoms as 25.0 g of oxygen difluoride,OF₂?

Determine the name for N₂O₅.

What is the mass of 9.00 × 10²² molecules of NH₃?

How many oxygen atoms are there in 3.00 g of sodium dichromate,Na₂Cr₂O₇?