Question 1

Which of the following is an ionic compound?

Accepted Answer

A)  S Br2 
B)  Mg3(PO4)2 
C)  Cl2O 
D)  CH2O 
E)  P Br5 
A)  S Br2 
B)  Mg3(PO4)2 
C)  Cl2O 
D)  CH2O 
E)  P Br5

Question 2

Na2S is named

Accepted Answer

A)  sodium disulfide. 
B)  sodium sulfide. 
C)  sodium(II) sulfide. 
D)  sodium sulfur. 
A)  sodium disulfide. 
B)  sodium sulfide. 
C)  sodium(II) sulfide. 
D)  sodium sulfur.

Question 3

Which one of the following is NOT an empirical formula?

Accepted Answer

A)  CHO 
B)  CH2O 
C)  C2H4O 
D)  C2H6O2 
A)  CHO 
B)  CH2O 
C)  C2H4O 
D)  C2H6O2

Question 4

An unknown compound contains only carbon and hydrogen.When it undergoes combustion analysis,it produces 3.767 g of CO2 and 0.616 g of H2O.What is the empirical formula?

Accepted Answer

A)  C5H4 
B)  C7H14 
C)  C2H3 
D)  CH 
E)  CH4 
A)  C5H4 
B)  C7H14 
C)  C2H3 
D)  CH 
E)  CH4

Question 5

How many atoms of oxygen are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.

Accepted Answer

A)  1.23 × 1023 O atoms 
B)  2.96 × 1024 O atoms 
C)  2.87 × 1025 O atoms 
D)  1.10 × 1024 O atoms 
E)  3.68 × 1023 O atoms 
A)  1.23 × 1023 O atoms 
B)  2.96 × 1024 O atoms 
C)  2.87 × 1025 O atoms 
D)  1.10 × 1024 O atoms 
E)  3.68 × 1023 O atoms

Question 6

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest,whole-number coefficients?
________ C3H8O (l)+ ________ O2(g)→ ________ CO2(g)+ ________ H2O(l)

Accepted Answer

A)  3 
B)  5 
C)  7 
D)  9 
A)  3 
B)  5 
C)  7 
D)  9

Question 7

What is the empirical formula for C8H16O4?

Accepted Answer

A)  C2H5O 
B)  CHO 
C)  C2H4O 
D)  CHO2 
E)  CH2O 
A)  C2H5O 
B)  CHO 
C)  C2H4O 
D)  CHO2 
E)  CH2O

Question 8

Which of the following is a molecular element?

Accepted Answer

A)  barium 
B)  argon 
C)  xenon 
D)  fluorine 
E)  sodium 
A)  barium 
B)  argon 
C)  xenon 
D)  fluorine 
E)  sodium

Question 9

Which of the following is a molecular element?

Accepted Answer

A)  argon 
B)  sodium 
C)  sulfur 
D)  calcium 
E)  titanium 
A)  argon 
B)  sodium 
C)  sulfur 
D)  calcium 
E)  titanium

Question 10

Give the formula for sulfurous acid.

Accepted Answer

A)  H2SO3 
B)  HSO3 
C)  H2SO4 
D)  HSO4 
A)  H2SO3 
B)  HSO3 
C)  H2SO4 
D)  HSO4

Question 11

Determine the mass percent (to the hundredths place)of Na in sodium bicarbonate (NaHCO3).

Accepted Answer

Question 12

Determine the empirical formula for a compound that is found to contain 10.15 mg P and 34.85 mg Cl.

Accepted Answer

A)  P3Cl 
B)  PCl 
C)  PCl2 
D)  P2Cl3 
E)  PCl3 
A)  P3Cl 
B)  PCl 
C)  PCl2 
D)  P2Cl3 
E)  PCl3

Question 13

Identify a hydrocarbon.

Accepted Answer

A)  CH3CH2SCH2CH3 
B)  CH3CH2Cl 
C)  CH3CH2PH2 
D)  CH3CH2CH2CH3 
E)  CH3COOH 
A)  CH3CH2SCH2CH3 
B)  CH3CH2Cl 
C)  CH3CH2PH2 
D)  CH3CH2CH2CH3 
E)  CH3COOH

Question 14

Which of the following represent the Lewis structure for Br⁻?

Accepted Answer

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

Question 15

Which of the following represent the Lewis structure for Ca2⁺?

Accepted Answer

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

Question 16

What is the empirical formula for Hg2(NO3)2?

Accepted Answer

A)  Hg2(NO3)2 
B)  HgNO3 
C)  Hg(NO3)2 
D)  Hg2NO3 
E)  Hg4(NO3)4 
A)  Hg2(NO3)2 
B)  HgNO3 
C)  Hg(NO3)2 
D)  Hg2NO3 
E)  Hg4(NO3)4

Question 17

What is the mass (in kg)of 6.89 × 1025 molecules of CO2? The molar mass of CO2 is 44.01 g/mol.

Accepted Answer

A)  3.85 kg 
B)  5.04 kg 
C)  2.60 kg 
D)  3.03 kg 
E)  6.39 kg 
A)  3.85 kg 
B)  5.04 kg 
C)  2.60 kg 
D)  3.03 kg 
E)  6.39 kg

Question 18

Which ionic compound would be expected to have the highest lattice energy?

Accepted Answer

A)  Na Cl 
B)  Mg Cl2 
C)  Al Cl3 
D)  C Cl4 
A)  Na Cl 
B)  Mg Cl2 
C)  Al Cl3 
D)  C Cl4

Question 19

When drawing out Lewis structures,how many electrons surround the most stable element?

Accepted Answer

A)  1 
B)  3 
C)  6 
D)  8 
E)  10 
A)  1 
B)  3 
C)  6 
D)  8 
E)  10

Question 20

Write a possible molecular formula for C4H4O.

Accepted Answer

A)  C16H16O4 
B)  C12H12O2 
C)  C2H2O 
D)  C8H8O 
A)  C16H16O4 
B)  C12H12O2 
C)  C2H2O 
D)  C8H8O

Exam 5: Molecules and Compounds

Which of the following is an ionic compound?

Na2S is named

Which one of the following is NOT an empirical formula?

An unknown compound contains only carbon and hydrogen.When it undergoes combustion analysis,it produces 3.767 g of CO2 and 0.616 g of H2O.What is the empirical formula?

How many atoms of oxygen are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest,whole-number coefficients? ________ C3H8O (l)+ ________ O2(g)→ ________ CO2(g)+ ________ H2O(l)

What is the empirical formula for C8H16O4?

Which of the following is a molecular element?

Which of the following is a molecular element?

Give the formula for sulfurous acid.

Determine the mass percent (to the hundredths place)of Na in sodium bicarbonate (NaHCO3).

Determine the empirical formula for a compound that is found to contain 10.15 mg P and 34.85 mg Cl.

Identify a hydrocarbon.

Which of the following represent the Lewis structure for Br⁻?

Which of the following represent the Lewis structure for Ca2⁺?

What is the empirical formula for Hg2(NO3)2?

What is the mass (in kg)of 6.89 × 1025 molecules of CO2? The molar mass of CO2 is 44.01 g/mol.

Which ionic compound would be expected to have the highest lattice energy?

When drawing out Lewis structures,how many electrons surround the most stable element?

Write a possible molecular formula for C4H4O.

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

Na₂S is named

An unknown compound contains only carbon and hydrogen.When it undergoes combustion analysis,it produces 3.767 g of CO₂ and 0.616 g of H₂O.What is the empirical formula?

How many atoms of oxygen are contained in 47.6 g of Al₂(CO₃)₃? The molar mass of Al₂(CO₃)₃is 233.99 g/mol.

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest,whole-number coefficients? C₃H₈O(l)+ O₂(g)→ CO₂(g)+ H₂O(l)

What is the empirical formula for C₈H₁₆O₄?

Determine the mass percent (to the hundredths place)of Na in sodium bicarbonate (NaHCO₃).

Which of the following represent the Lewis structure for Ca²⁺?

What is the empirical formula for Hg₂(NO₃)₂?

What is the mass (in kg)of 6.89 × 10²⁵molecules of CO₂? The molar mass of CO₂ is 44.01 g/mol.

Write a possible molecular formula for C₄H₄O.