Question 1

How many oxygen atoms are there in 7.00 g of sodium dichromate,Na2Cr2O7?

Accepted Answer

A) 0.187 oxygen atoms 
B) 2.30 × 1021 oxygen atoms 
C) 1.60 × 1022 oxygen atoms 
D) 1.13 × 1023 oxygen atoms 
A) 0.187 oxygen atoms 
B) 2.30 × 1021 oxygen atoms 
C) 1.60 × 1022 oxygen atoms 
D) 1.13 × 1023 oxygen atoms D

Question 2

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 A

Question 3

The name of which compound ends in -ite?

Accepted Answer

A) HIO3  
B) Na2SO3  
C) H2SO3  
D) Na2CO3  
E) CaH2  
A) HIO3  
B) Na2SO3  
C) H2SO3  
D) Na2CO3  
E) CaH2  B

Question 4

Combustion analysis is one way to determine the simplest formula of some compounds.

Accepted Answer

A) True 
 B)False

Question 5

The complete combustion of 0.285 g of a pure hydrocarbon yielded 0.878 g CO2 and 0.405 g H2O.What is the mass % C in this hydrocarbon?

Accepted Answer

A) 27.3% 
B) 24.0% 
C) 84.1% 
D) 32.4% 
E) 72.7% 
A) 27.3% 
B) 24.0% 
C) 84.1% 
D) 32.4% 
E) 72.7%

Question 6

What is the empirical formula of a substance that contains 5.28 g of C,1.11 g of H,and 3.52 g of O?

Accepted Answer

A) C2H O5  
B) C2H4O2 
C) C2H4O3 
D) C3H4O4 
A) C2H O5  
B) C2H4O2 
C) C2H4O3 
D) C3H4O4

Question 7

In the following group,the compound with the greatest percentage of oxygen by mass is:

Accepted Answer

A) ClO2  
B) Na2CO3  
C) P4O6  
D) SO2  
E) As2O3  
A) ClO2  
B) Na2CO3  
C) P4O6  
D) SO2  
E) As2O3

Question 8

Rb2S is named:

Accepted Answer

A) rubidium disulfide 
B) rubidium sulfide 
C) rubidium(II)sulfide 
D) rubidium sulfur 
A) rubidium disulfide 
B) rubidium sulfide 
C) rubidium(II)sulfide 
D) rubidium sulfur

Question 9

In which set do all elements tend to form anions in binary ionic compounds?

Accepted Answer

A) C,S,Pb 
B) K,Fe,Br 
C) Li,Na,K 
D) N,O,I 
A) C,S,Pb 
B) K,Fe,Br 
C) Li,Na,K 
D) N,O,I

Question 10

Nitroglycerin,C3H5N3O3:

Accepted Answer

A) has equal amounts of C and N by mass 
B) has less than 50% O by mass 
C) has the same proportion of N to H atoms as does NH3  
D) has the same mass percent of C and N 
E) has higher mass percent of H than O 
A) has equal amounts of C and N by mass 
B) has less than 50% O by mass 
C) has the same proportion of N to H atoms as does NH3  
D) has the same mass percent of C and N 
E) has higher mass percent of H than O

Question 11

An organic compound contains C,H,and O.The percentages of H and C are 6.73% H,and 39.99% C by mass.The molecular mass is 60.06 u.What is the molecular formula of the compound?

Accepted Answer

A) CH2O 
B) C3H6O3 
C) C2H3O2  
D) C2H4O2  
E) C4H8O4  
A) CH2O 
B) C3H6O3 
C) C2H3O2  
D) C2H4O2  
E) C4H8O4

Question 12

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

Accepted Answer

Question 13

How many grams of Cr are found in 1.00 × 102 g of K2Cr2O7?

Accepted Answer

A) 35.4 g 
B) 24.3 g 
C) 12.2 g 
D) 48.6 g 
E) 33.8 g 
A) 35.4 g 
B) 24.3 g 
C) 12.2 g 
D) 48.6 g 
E) 33.8 g

Question 14

Aspartame,C14H18N2O5,a low-calorie sweetener,is about 200 times sweeter than sugar.How many molecules of aspartame are there in a one-gram packet of sweetener containing 36 mg aspartame?

Accepted Answer

A) 2.0 × 1018 molecules of aspartame 
B) 4.0 × 1020 molecules of aspartame 
C) 7.2 × 1025 molecules of aspartame 
D) 1.4 × 1022 molecules of aspartame 
E) 7.4 × 1019 molecules of aspartame 
A) 2.0 × 1018 molecules of aspartame 
B) 4.0 × 1020 molecules of aspartame 
C) 7.2 × 1025 molecules of aspartame 
D) 1.4 × 1022 molecules of aspartame 
E) 7.4 × 1019 molecules of aspartame

Question 15

What is the charge on the Cr ions in Cr2O3?

Accepted Answer

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

Question 16

What is the oxidation number of the sulfur atom in K2SO4?

Accepted Answer

A) -2 
B) +2 
C) +4 
D) +6 
A) -2 
B) +2 
C) +4 
D) +6

Question 17

Choose the INCORRECT name formula combination.

Accepted Answer

A) CaH2 calcium hydroxide 
B) SiO2 silicon dioxide 
C) HClO hypochlorous acid 
D) Cu3(PO4)2 copper(II)phosphate 
E) AlCl3 aluminum chloride 
A) CaH2 calcium hydroxide 
B) SiO2 silicon dioxide 
C) HClO hypochlorous acid 
D) Cu3(PO4)2 copper(II)phosphate 
E) AlCl3 aluminum chloride

Question 18

The explosive,trinitrotoluene,TNT,C6H3N3O6,has the same proportion of:

Accepted Answer

A) N to H atoms as does NH3  
B) H to O atoms as does H2O 
C) N to O atoms as does NO2  
D) C to H atoms as does C6H6  
E) C to O atoms as does CO2  
A) N to H atoms as does NH3  
B) H to O atoms as does H2O 
C) N to O atoms as does NO2  
D) C to H atoms as does C6H6  
E) C to O atoms as does CO2

Question 19

Fumaric acid,C4H4O4,can be extracted from plants and can be used as a substitute for citrus acid in fruit drinks.The percent composition by mass of fumaric acid is ________.

Accepted Answer

A) C 33.33% H 33.33% O 33.33% 
B) C 39.80% H 6.68% O 53.52% 
C) C 40.00% H 6.67% O 53.33% 
D) C 41.39% H 3.47% O 55.14% 
E) C 0.25% H 0.25% O 0.50% 
A) C 33.33% H 33.33% O 33.33% 
B) C 39.80% H 6.68% O 53.52% 
C) C 40.00% H 6.67% O 53.33% 
D) C 41.39% H 3.47% O 55.14% 
E) C 0.25% H 0.25% O 0.50%

Question 20

How many anions are there in 2.50 g of MgBr2?

Accepted Answer

A) 8.18 × 1021 anions 
B) 1.64 × 1022 anions 
C) 4.43 × 1025 anions 
D) 8.87 × 1025 anions 
A) 8.18 × 1021 anions 
B) 1.64 × 1022 anions 
C) 4.43 × 1025 anions 
D) 8.87 × 1025 anions

Exam 3: Chemical Compounds

How many oxygen atoms are there in 7.00 g of sodium dichromate,Na2Cr2O7?

An aqueous solution of H2S is named:

The name of which compound ends in -ite?

Combustion analysis is one way to determine the simplest formula of some compounds.

The complete combustion of 0.285 g of a pure hydrocarbon yielded 0.878 g CO2 and 0.405 g H2O.What is the mass % C in this hydrocarbon?

What is the empirical formula of a substance that contains 5.28 g of C,1.11 g of H,and 3.52 g of O?

In the following group,the compound with the greatest percentage of oxygen by mass is:

Rb2S is named:

In which set do all elements tend to form anions in binary ionic compounds?

Nitroglycerin,C3H5N3O3:

An organic compound contains C,H,and O.The percentages of H and C are 6.73% H,and 39.99% C by mass.The molecular mass is 60.06 u.What is the molecular formula of the compound?

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

How many grams of Cr are found in 1.00 × 102 g of K2Cr2O7?

Aspartame,C14H18N2O5,a low-calorie sweetener,is about 200 times sweeter than sugar.How many molecules of aspartame are there in a one-gram packet of sweetener containing 36 mg aspartame?

What is the charge on the Cr ions in Cr2O3?

What is the oxidation number of the sulfur atom in K2SO4?

Choose the INCORRECT name formula combination.

The explosive,trinitrotoluene,TNT,C6H3N3O6,has the same proportion of:

Fumaric acid,C4H4O4,can be extracted from plants and can be used as a substitute for citrus acid in fruit drinks.The percent composition by mass of fumaric acid is ________.

How many anions are there in 2.50 g of MgBr2?

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

How many oxygen atoms are there in 7.00 g of sodium dichromate,Na₂Cr₂O₇?

An aqueous solution of H₂S is named:

The complete combustion of 0.285 g of a pure hydrocarbon yielded 0.878 g CO₂ and 0.405 g H₂O.What is the mass % C in this hydrocarbon?

Rb₂S is named:

Nitroglycerin,C₃H₅N₃O₃:

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

How many grams of Cr are found in 1.00 × 10² g of K₂Cr₂O₇?

Aspartame,C₁₄H₁₈N₂O₅,a low-calorie sweetener,is about 200 times sweeter than sugar.How many molecules of aspartame are there in a one-gram packet of sweetener containing 36 mg aspartame?

What is the charge on the Cr ions in Cr₂O₃?

What is the oxidation number of the sulfur atom in K₂SO₄?

The explosive,trinitrotoluene,TNT,C₆H₃N₃O₆,has the same proportion of:

Fumaric acid,C₄H₄O₄,can be extracted from plants and can be used as a substitute for citrus acid in fruit drinks.The percent composition by mass of fumaric acid is ________.

How many anions are there in 2.50 g of MgBr₂?