Question 1

How many molecules of butane are contained in 25.0 mL of butane? The density of butane is 0.6011 g mL-1 and the molar mass is 58.12 g mol-1.

Accepted Answer

A)  2.59 × 1023 molecules butane 
B)  1.46 × 1027 molecules butane 
C)  6.87 × 1023 molecules butane 
D)  1.56 × 1023 molecules butane 
E)  7.14 × 1025 molecules butane 
A)  2.59 × 1023 molecules butane 
B)  1.46 × 1027 molecules butane 
C)  6.87 × 1023 molecules butane 
D)  1.56 × 1023 molecules butane 
E)  7.14 × 1025 molecules butane

Question 2

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

Accepted Answer

A)  Ca 
B)  K 
C)  Kr 
D)  Se 
A)  Ca 
B)  K 
C)  Kr 
D)  Se

Question 3

How many molecules are in 16.61 g of acetic acid, C2H4O2?

Accepted Answer

A)  6.007 × 1026 
B)  6.0375 × 1023 
C)  1.666 × 1023 
D)  6.0375 × 1020 
E)  6.004 × 10-24 
A)  6.007 × 1026 
B)  6.0375 × 1023 
C)  1.666 × 1023 
D)  6.0375 × 1020 
E)  6.004 × 10-24

Question 4

Identify the name for SnO.

Accepted Answer

A)  tin(I) oxide 
B)  tin(II) oxide 
C)  tin(III) oxide 
D)  tin(IV) oxide 
A)  tin(I) oxide 
B)  tin(II) oxide 
C)  tin(III) oxide 
D)  tin(IV) oxide

Question 5

A sample of pure lithium nitrate contains 10.1% lithium by mass. What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample?

Accepted Answer

A)  5.05% 
B)  10.1% 
C)  20.2% 
D)  40.4% 
A)  5.05% 
B)  10.1% 
C)  20.2% 
D)  40.4%

Question 6

Identify the compound with (an) ionic bond(s).

Accepted Answer

A)  SO2 
B)  CO 
C)  O2 
D)  H2O 
E)  KBr 
A)  SO2 
B)  CO 
C)  O2 
D)  H2O 
E)  KBr

Question 7

Which one of the following contains 39% carbon by mass?

Accepted Answer

A)  C2H2 
B)  CH4 
C)  CH3NH2 
D)  CO2 
A)  C2H2 
B)  CH4 
C)  CH3NH2 
D)  CO2

Question 8

A typical cup of coffee has about 100. mg of caffeine. Calculate the number of caffeine molecules in 100. mg C8H10N4O2.

Accepted Answer

A)  3.22 × 10-21 
B)  3.10 × 1020 
C)  1.17 × 1025 
D)  3.10 × 1022 
E)  3.10 × 1025 
A)  3.22 × 10-21 
B)  3.10 × 1020 
C)  1.17 × 1025 
D)  3.10 × 1022 
E)  3.10 × 1025

Question 9

Hematite is the mineral form of iron(III) oxide. Calculate the number of iron ions in 20.0 kg of pure hematite.

Accepted Answer

A)  1.51 × 1026  
B)  7.54 × 1025 
C)  3.77 × 1017 
D)  6.63 × 10-27 
E)  9.62 × 1021 
A)  1.51 × 1026  
B)  7.54 × 1025 
C)  3.77 × 1017 
D)  6.63 × 10-27 
E)  9.62 × 1021

Question 10

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 11

The compound ClO is named ________.

Accepted Answer

A)  chlorite 
B)  hypochlorite 
C)  chlorine monoxide 
D)  chlorine ( II) oxide 
A)  chlorite 
B)  hypochlorite 
C)  chlorine monoxide 
D)  chlorine ( II) oxide

Question 12

What is the mass of 9.44 × 1024 molecules of NO2? The molar mass of NO2 is 46.01 g mol-1.

Accepted Answer

A)  205 g 
B)  294 g 
C)  721 g 
D)  341 g 
E)  685 g 
A)  205 g 
B)  294 g 
C)  721 g 
D)  341 g 
E)  685 g

Question 13

The solid compound Na2CO3 contains ________.

Accepted Answer

A)  Na+, C4+, and O2- ions 
B)  Na+ and CO3 -2 ions 
C)  Na2+ and CO3 -2 ions 
D)  Na2CO3 molecules 
A)  Na+, C4+, and O2- ions 
B)  Na+ and CO3 -2 ions 
C)  Na2+ and CO3 -2 ions 
D)  Na2CO3 molecules

Question 14

Determine the name for Cl2O.

Accepted Answer

A)  chlorine oxide 
B)  dichlorine monoxide 
C)  chlorine(I) oxide 
D)  chlorine(II) oxide 
E)  chlorate 
A)  chlorine oxide 
B)  dichlorine monoxide 
C)  chlorine(I) oxide 
D)  chlorine(II) oxide 
E)  chlorate

Question 15

Identify the formula for strontium nitride.

Accepted Answer

A)  Sr3N2 
B)  Sr(NO3)2 
C)  SrN 
D)  Sr2N3 
E)  Sr(NO2)2 
A)  Sr3N2 
B)  Sr(NO3)2 
C)  SrN 
D)  Sr2N3 
E)  Sr(NO2)2

Question 16

What is the empirical formula of a compound that is 66.6% C, 11.2% H, and 22.2% O by mass?

Accepted Answer

A)  C5H10O2 
B)  C8HO4 
C)  C6H12O2 
D)  C4H8O 
E)  C4H2O 
A)  C5H10O2 
B)  C8HO4 
C)  C6H12O2 
D)  C4H8O 
E)  C4H2O

Question 17

The chemical formula for the selenite ion is ________.

Accepted Answer

A)  Se- 
B)  Se2- 
C)  SeO32- 
D)  SeO42- 
A)  Se- 
B)  Se2- 
C)  SeO32- 
D)  SeO42-

Question 18

What mass of phosphorus pentafluoride, PF5, has the same number of fluorine atoms as 25.0 g of oxygen difluoride, OF2?

Accepted Answer

A)  0.933 g 
B)  10.0 g 
C)  23.3 g 
D)  146 g 
A)  0.933 g 
B)  10.0 g 
C)  23.3 g 
D)  146 g

Question 19

What is the chemical formula for iron( III) sulfate?

Accepted Answer

A)  Fe3S 
B)  Fe3SO4 
C)  Fe2S3 
D)  Fe2( SO4)3 
A)  Fe3S 
B)  Fe3SO4 
C)  Fe2S3 
D)  Fe2( SO4)3

Question 20

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

Exam 3: Molecules, Compounds, and Nomenclature

How many molecules of butane are contained in 25.0 mL of butane? The density of butane is 0.6011 g mL-1 and the molar mass is 58.12 g mol-1.

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

How many molecules are in 16.61 g of acetic acid, C2H4O2?

Identify the name for SnO.

A sample of pure lithium nitrate contains 10.1% lithium by mass. What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample?

Identify the compound with (an) ionic bond(s).

Which one of the following contains 39% carbon by mass?

A typical cup of coffee has about 100. mg of caffeine. Calculate the number of caffeine molecules in 100. mg C8H10N4O2.

Hematite is the mineral form of iron(III) oxide. Calculate the number of iron ions in 20.0 kg of pure hematite.

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

The compound ClO is named ________.

What is the mass of 9.44 × 1024 molecules of NO2? The molar mass of NO2 is 46.01 g mol-1.

The solid compound Na2CO3 contains ________.

Determine the name for Cl2O.

Identify the formula for strontium nitride.

What is the empirical formula of a compound that is 66.6% C, 11.2% H, and 22.2% O by mass?

The chemical formula for the selenite ion is ________.

What mass of phosphorus pentafluoride, PF5, has the same number of fluorine atoms as 25.0 g of oxygen difluoride, OF2?

What is the chemical formula for iron( III) sulfate?

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

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 Metallurgy

Transition Metals and Coordination Compounds

Filters

How many molecules of butane are contained in 25.0 mL of butane? The density of butane is 0.6011 g mL^-1 and the molar mass is 58.12 g mol^-1.

How many molecules are in 16.61 g of acetic acid, C₂H₄O₂?

A typical cup of coffee has about 100. mg of caffeine. Calculate the number of caffeine molecules in 100. mg C₈H₁₀N₄O₂.

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

The compound ClOis named ________.

What is the mass of 9.44 × 10²⁴ molecules of NO₂? The molar mass of NO₂ is 46.01 g mol^-1.

The solid compound Na₂CO₃ contains ________.

Determine the name for Cl₂O.

What mass of phosphorus pentafluoride, PF₅, has the same number of fluorine atoms as 25.0 g of oxygen difluoride, OF₂?

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