Question 1

Calculate the molar mass of Ca3(PO4)2.

Accepted Answer

A) 87.05 g mol-1 
B) 215.21 g mol-1 
C) 310.18 g mol-1 
D) 279.21 g mol-1 
E) 246.18 g mol-1 
A) 87.05 g mol-1 
B) 215.21 g mol-1 
C) 310.18 g mol-1 
D) 279.21 g mol-1 
E) 246.18 g mol-1

Question 2

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium.How much calcium is contained in 40.0 g of calcium fluoride?

Accepted Answer

A) 2.27 g 
B) 7.70 g 
C) 15.0 g 
D) 20.5 g 
A) 2.27 g 
B) 7.70 g 
C) 15.0 g 
D) 20.5 g

Question 3

Which of the following exists as a polyatomic molecule?

Accepted Answer

A) He 
B) C 
C) P 
D) Na 
E) Ne 
A) He 
B) C 
C) P 
D) Na 
E) Ne

Question 4

Which of the following compounds is ethanol?

Accepted Answer

A) C2H6 
B) C2H5OH 
C) CH3CO2H 
D) CH3CO2CH3 
E) CH3-O-CH3 
A) C2H6 
B) C2H5OH 
C) CH3CO2H 
D) CH3CO2CH3 
E) CH3-O-CH3

Question 5

Which one of the following is not an empirical formula?

Accepted Answer

A) CHO 
B) CH2O 
C) C2H4O 
D) C2H4O2 
A) CHO 
B) CH2O 
C) C2H4O 
D) C2H4O2

Question 6

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 7

How many sodium ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g mol-1.

Accepted Answer

A) 1.52 × 1027 sodium ions 
B) 4.76 × 1020 sodium ions 
C) 2.10 × 1021 sodium ions 
D) 1.05 × 1021 sodium ions 
E) 9.52 × 1020 sodium ions 
A) 1.52 × 1027 sodium ions 
B) 4.76 × 1020 sodium ions 
C) 2.10 × 1021 sodium ions 
D) 1.05 × 1021 sodium ions 
E) 9.52 × 1020 sodium ions

Question 8

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

Question 9

Methane and oxygen react to form carbon dioxide and water.What mass of water is formed if 0.80 g of methane reacts with 3.2 g of oxygen to produce 2.2 g of carbon dioxide?

Accepted Answer

A) 1.8 g 
B) 2.2 g 
C) 3.7 g 
D) 4.0 g 
A) 1.8 g 
B) 2.2 g 
C) 3.7 g 
D) 4.0 g

Question 10

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 11

How many molecules are in 0.1339 kg of ethanol,C2H6O?

Accepted Answer

A) 1.750 × 1024 
B) 3.715 × 1027 
C) 5.712 × 10-25 
D) 9.763 × 1019 
E) 9.763 × 1022 
A) 1.750 × 1024 
B) 3.715 × 1027 
C) 5.712 × 10-25 
D) 9.763 × 1019 
E) 9.763 × 1022

Question 12

Which of the compounds,C5H12,MgBr2,Mn(NO3)2,PCl3, are expected to exist as molecules?

Accepted Answer

A) only C5H12 
B) C5H12 and PCl3 
C) C5H12,Mn(NO3)2,and PCl3 
D) MgBr2 and Mn(NO3)2 
A) only C5H12 
B) C5H12 and PCl3 
C) C5H12,Mn(NO3)2,and PCl3 
D) MgBr2 and Mn(NO3)2

Question 13

Calculate the number of oxygen atoms in 1.187 g of nickel(II)carbonate.

Accepted Answer

A) 1.807 × 1026 
B) 5.535 × 1023 
C) 6.022 × 1021 
D) 1.282 × 1022 
E) 1.807 × 1022 
A) 1.807 × 1026 
B) 5.535 × 1023 
C) 6.022 × 1021 
D) 1.282 × 1022 
E) 1.807 × 1022

Question 14

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

Accepted Answer

A) CO2 
B) H2O2 
C) CH4 
D) LiBr 
E) H2 
A) CO2 
B) H2O2 
C) CH4 
D) LiBr 
E) H2

Question 15

Identify the formula for copper (II)sulfate pentahydrate.

Accepted Answer

A) Cu2SO3∙H5 
B) Cu2S∙H2O 
C) CuS∙5H2O 
D) (CuSO4)5 
E) CuSO4∙5H2O 
A) Cu2SO3∙H5 
B) Cu2S∙H2O 
C) CuS∙5H2O 
D) (CuSO4)5 
E) CuSO4∙5H2O

Question 16

Identify the name for aqueous H2SO4.

Accepted Answer

A) sulfuric acid 
B) persulfurous acid 
C) sulfurous acid 
D) hyposulfurous acid 
E) persulfuric acid 
A) sulfuric acid 
B) persulfurous acid 
C) sulfurous acid 
D) hyposulfurous acid 
E) persulfuric acid

Question 17

Formaldehyde,CH2O,is the simplest aldehyde and is commonly used as an embalming fluid.Calculate the mass of 8.16 × 1024 molecules of formaldehyde.

Accepted Answer

A) 451 g 
B) 407 g 
C) 0.451 g 
D) 246 g 
E) 24.6 g 
A) 451 g 
B) 407 g 
C) 0.451 g 
D) 246 g 
E) 24.6 g

Question 18

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 19

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 20

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 50.00 g sample of the alcohol produced 95.50 g of CO2 and 58.70 g of H2O.What is the empirical formula of the alcohol?

Accepted Answer

Exam 3: Molecules,compounds,and Nomenclature

Calculate the molar mass of Ca3(PO4)2.

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium.How much calcium is contained in 40.0 g of calcium fluoride?

Which of the following exists as a polyatomic molecule?

Which of the following compounds is ethanol?

Which one of the following is not an empirical formula?

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

How many sodium ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g mol-1.

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

Methane and oxygen react to form carbon dioxide and water.What mass of water is formed if 0.80 g of methane reacts with 3.2 g of oxygen to produce 2.2 g of carbon dioxide?

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 0.1339 kg of ethanol,C2H6O?

Which of the compounds,C5H12,MgBr2,Mn(NO3)2,PCl3, are expected to exist as molecules?

Calculate the number of oxygen atoms in 1.187 g of nickel(II)carbonate.

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

Identify the formula for copper (II)sulfate pentahydrate.

Identify the name for aqueous H2SO4.

Formaldehyde,CH2O,is the simplest aldehyde and is commonly used as an embalming fluid.Calculate the mass of 8.16 × 1024 molecules of formaldehyde.

An aqueous solution of H2S is named

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

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 50.00 g sample of the alcohol produced 95.50 g of CO2 and 58.70 g of H2O.What is the empirical formula of the alcohol?

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

Calculate the molar mass of Ca₃(PO₄)₂.

How many sodium ions are contained in 99.6 mg of Na₂SO₃? The molar mass of Na₂SO₃is 126.05 g mol^-1.

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

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 0.1339 kg of ethanol,C₂H₆O?

Which of the compounds,C₅H₁₂,MgBr₂,Mn(NO₃)₂,PCl_3, are expected to exist as molecules?

Identify the name for aqueous H₂SO₄.

Formaldehyde,CH₂O,is the simplest aldehyde and is commonly used as an embalming fluid.Calculate the mass of 8.16 × 10²⁴ molecules of formaldehyde.

An aqueous solution of H₂S is named

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 50.00 g sample of the alcohol produced 95.50 g of CO₂ and 58.70 g of H₂O.What is the empirical formula of the alcohol?