Question 1

What is the structure of the covalent compound formed by nitrogen and oxygen? Is this the only possibility? Explain.

Accepted Answer

Since nitrogen and oxygen are both nonmetals, they combine by sharing electrons. This can be done in multiple ways. Some possible compounds are N₂O, N₂O₃, NO₂.

Question 2

Which of the compounds, Na H , HS , C4H10, BrF3,are ionic compounds?

Accepted Answer

A) only C4H10 
B) only Na H  
C) Na H  and HS  
D) HS , C4H10, and BrF3 
A) only C4H10 
B) only Na H  
C) Na H  and HS  
D) HS , C4H10, and BrF3 B

Question 3

Combustion analysis of 1.200 g of an unknown compound containing carbon, hydrogen, and oxygen produced 2.086 g of CO2 and 1.134 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 D

Question 4

What is the mass of a single fluorine molecule, F2?

Accepted Answer

A) 3.155 × 10-23 g 
B) 6.310 × 10-23 g 
C) 19.00 g 
D) 38.00 g 
A) 3.155 × 10-23 g 
B) 6.310 × 10-23 g 
C) 19.00 g 
D) 38.00 g

Question 5

The compound CO is named

Accepted Answer

A) carbonate. 
B) carbonite. 
C) carbon dioxide. 
D) carbon(IV)oxide. 
A) carbonate. 
B) carbonite. 
C) carbon dioxide. 
D) carbon(IV)oxide.

Question 6

Determine the name for aqueous HBr.

Accepted Answer

A) bromic acid 
B) bromous acid 
C) hydrobromous acid 
D) hydrogen bromate 
E) hydrobromic acid 
A) bromic acid 
B) bromous acid 
C) hydrobromous acid 
D) hydrogen bromate 
E) hydrobromic acid

Question 7

What is the chemical formula for calcium hydroxide?

Accepted Answer

A) CaH2 
B) CaOH 
C) CaOH2 
D) Ca(OH)2 
A) CaH2 
B) CaOH 
C) CaOH2 
D) Ca(OH)2

Question 8

What is the empirical formula for C4H10O2?

Accepted Answer

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

Question 9

Give the mass percent of carbon in C14H19NO2.

Accepted Answer

A) 38.89% 
B) 72 .07% 
C) 5.17% 
D) 2.78% 
A) 38.89% 
B) 72 .07% 
C) 5.17% 
D) 2.78%

Question 10

How many moles of N2O3 contain 2.55 × 1024 oxygen atoms?

Accepted Answer

A) 1.41 moles N2O3 
B) 4.23 moles N2O3 
C) 12.7 moles N2O3 
D) 7.87 moles N2O3 
E) 2.82 moles N2O3 
A) 1.41 moles N2O3 
B) 4.23 moles N2O3 
C) 12.7 moles N2O3 
D) 7.87 moles N2O3 
E) 2.82 moles N2O3

Question 11

Which of the following has the smallest mass?

Accepted Answer

A) 3.50 × 1023 molecules of I2 
B) 85.0 g of Cl2 
C) 2.50 mol of F2 
D) 0.050 kg of Br2 
A) 3.50 × 1023 molecules of I2 
B) 85.0 g of Cl2 
C) 2.50 mol of F2 
D) 0.050 kg of Br2

Question 12

Which of the compounds, C4H10, BaCl2, Ni(NO3)2, SF6, are expected to exist as molecules?

Accepted Answer

A) only C4H10 
B) C4H10 and SF6 
C) C4H10, Ni(NO3)2, and SF6 
D) BaCl2 and Ni(NO3)2 
A) only C4H10 
B) C4H10 and SF6 
C) C4H10, Ni(NO3)2, and SF6 
D) BaCl2 and Ni(NO3)2

Question 13

What is the chemical formula for magnesium hydride?

Accepted Answer

A) MgH2 
B) MgOH 
C) MgOH2 
D) Mg(OH)2 
A) MgH2 
B) MgOH 
C) MgOH2 
D) Mg(OH)2

Question 14

Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g mL-1 and its molar mass is 86.17 g mol-1.

Accepted Answer

A) 8.59 mL 
B) 13.5 mL 
C) 7.40 mL 
D) 12.4 mL 
E) 11.6 mL 
A) 8.59 mL 
B) 13.5 mL 
C) 7.40 mL 
D) 12.4 mL 
E) 11.6 mL

Question 15

Determine the name for P4O10.

Accepted Answer

A) phosphorus(IV)oxide 
B) diphosphorus pentoxide 
C) phosphorus oxide 
D) phosphorus(II)oxide 
E) tetraphosphorus decoxide 
A) phosphorus(IV)oxide 
B) diphosphorus pentoxide 
C) phosphorus oxide 
D) phosphorus(II)oxide 
E) tetraphosphorus decoxide

Question 16

An aqueous solution of H2S is named

Accepted Answer

A) hydrosulfuric acid. 
B) hydrosulfurous acid. 
C) sulfuric acid. 
D) sulfurous acid. 
A) hydrosulfuric acid. 
B) hydrosulfurous acid. 
C) sulfuric acid. 
D) sulfurous acid.

Question 17

How many C2H4 molecules are contained in 45.8 mg of C2H4? The molar mass of C2H4 is 28.05 g mol-1.

Accepted Answer

A) 9.83 × 1020 C2H4 molecules 
B) 7.74 × 1026 C2H4 molecules 
C) 2.71 × 1020 C2H4 molecules 
D) 3.69 × 1023 C2H4 molecules 
E) 4.69 × 1023 C2H4 molecules 
A) 9.83 × 1020 C2H4 molecules 
B) 7.74 × 1026 C2H4 molecules 
C) 2.71 × 1020 C2H4 molecules 
D) 3.69 × 1023 C2H4 molecules 
E) 4.69 × 1023 C2H4 molecules

Question 18

Identify the sulfite ion.

Accepted Answer

A) S O-23 
B) HS O-3 
C) S2- 
D) S O-24 
E) HSO-4 
A) S O-23 
B) HS O-3 
C) S2- 
D) S O-24 
E) HSO-4

Question 19

Identify the charge, X, on the phosphide ion PX

Accepted Answer

A) -4 
B) -3 
C) -2 
D) -1 
E) +1 
A) -4 
B) -3 
C) -2 
D) -1 
E) +1

Question 20

Which of the following is a molecular compound?

Accepted Answer

A) NaCN 
B) LiOH 
C) SrI2 
D) ZnS 
E) P4O10 
A) NaCN 
B) LiOH 
C) SrI2 
D) ZnS 
E) P4O10

Exam 3: Molecules, Compounds, and Nomenclature

What is the structure of the covalent compound formed by nitrogen and oxygen? Is this the only possibility? Explain.

Which of the compounds, Na H , HS , C4H10, BrF3,are ionic compounds?

Combustion analysis of 1.200 g of an unknown compound containing carbon, hydrogen, and oxygen produced 2.086 g of CO2 and 1.134 g of H2O. What is the empirical formula of the compound?

What is the mass of a single fluorine molecule, F2?

The compound CO is named

Determine the name for aqueous HBr.

What is the chemical formula for calcium hydroxide?

What is the empirical formula for C4H10O2?

Give the mass percent of carbon in C14H19NO2.

How many moles of N2O3 contain 2.55 × 1024 oxygen atoms?

Which of the following has the smallest mass?

Which of the compounds, C4H10, BaCl2, Ni(NO3)2, SF6, are expected to exist as molecules?

What is the chemical formula for magnesium hydride?

Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g mL-1 and its molar mass is 86.17 g mol-1.

Determine the name for P4O10.

An aqueous solution of H2S is named

How many C2H4 molecules are contained in 45.8 mg of C2H4? The molar mass of C2H4 is 28.05 g mol-1.

Identify the sulfite ion.

Identify the charge, X, on the phosphide ion PX

Which of the following is a molecular compound?

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding Ii: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallury

Transition Metals and Coordination Compounds

Filters

Which of the compounds, NaH, HS, C₄H₁₀, BrF₃,are ionic compounds?

Combustion analysis of 1.200 g of an unknown compound containing carbon, hydrogen, and oxygen produced 2.086 g of CO₂ and 1.134 g of H₂O. What is the empirical formula of the compound?

What is the mass of a single fluorine molecule, F₂?

What is the empirical formula for C₄H₁₀O₂?

Give the mass percent of carbon in C₁₄H₁₉NO₂.

How many moles of N₂O₃ contain 2.55 × 10²⁴ oxygen atoms?

Which of the compounds, C₄H₁₀, BaCl₂, Ni(NO₃)₂, SF_6, are expected to exist as molecules?

Determine the volume of hexane that contains 5.33 × 10²² molecules of hexane. The density of hexane is 0.6548 g mL^-1 and its molar mass is 86.17 g mol^-1.

Determine the name for P₄O₁₀.

An aqueous solution of H₂S is named

How many C₂H₄ molecules are contained in 45.8 mg of C₂H₄? The molar mass of C₂H₄ is 28.05 g mol^-1.

Identify the charge, X, on the phosphide ion P^X