Question 1

Formic acid, HCOOH, is a major component in ant bites. Calculate the mass, in grams, of 3.14 × 1023 molecules of formic acid.

Accepted Answer

A) 0.0113 g 
B) 0.0417 g 
C) 24.0 g 
D) 11.3 g 
E) 0.0799 g 
A) 0.0113 g 
B) 0.0417 g 
C) 24.0 g 
D) 11.3 g 
E) 0.0799 g

Question 2

Identify the cyanide ion.

Accepted Answer

A)  MnO-4 
B) HCO-3 
C)  CO-23 
D) HCN 
E) CN- 
A)  MnO-4 
B) HCO-3 
C)  CO-23 
D) HCN 
E) CN-

Question 3

The ion IO2- is named

Accepted Answer

A) iodate ion. 
B) iodite ion. 
C) iodine dioxide ion. 
D) iodine(II)oxide ion. 
A) iodate ion. 
B) iodite ion. 
C) iodine dioxide ion. 
D) iodine(II)oxide ion.

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

The molecular weight of sucrose ( C12H22O11 ), table sugar, is ________ amu (rounded to one decimal place).

Accepted Answer

A) 330.3 
B) 29.0 
C) 342.3 
D) 45.0 
E) 182.0 
A) 330.3 
B) 29.0 
C) 342.3 
D) 45.0 
E) 182.0

Question 6

Which of the following is an acid in aqueous solution?

Accepted Answer

A) NH3 
B) NaF 
C) Ca(C2H3O2)2 
D) HI 
E) KCl 
A) NH3 
B) NaF 
C) Ca(C2H3O2)2 
D) HI 
E) KCl

Question 7

How many moles of PCl3 contain 3.68 × 1025 chlorine atoms?

Accepted Answer

A) 61.1 moles PCl3 
B) 20.4 moles PCl3 
C) 16.4 moles PCl3 
D) 54.5 moles PCl3 
E) 49.1 moles PCl3 
A) 61.1 moles PCl3 
B) 20.4 moles PCl3 
C) 16.4 moles PCl3 
D) 54.5 moles PCl3 
E) 49.1 moles PCl3

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

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 10

Which of the following is an ionic compound?

Accepted Answer

A) LiCl 
B) NO2 
C) PCl3 
D) CF4 
E) SeBr2 
A) LiCl 
B) NO2 
C) PCl3 
D) CF4 
E) SeBr2

Question 11

How many Fe(II)ions are there in 20.0 g of FeSO4?

Accepted Answer

A) 2.19 × 10-25 iron(II)ions 
B) 7.92 × 1022 iron(II)ions 
C) 4.57 × 1024 iron(II)ions 
D) 1.82 × 1027 iron(II)ions 
A) 2.19 × 10-25 iron(II)ions 
B) 7.92 × 1022 iron(II)ions 
C) 4.57 × 1024 iron(II)ions 
D) 1.82 × 1027 iron(II)ions

Question 12

Identify the name for 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 13

An ionic bond is best described as

Accepted Answer

A) the sharing of electrons. 
B) the transfer of electrons from one atom to another. 
C) the attraction that holds the atoms together in a polyatomic ion. 
D) the attraction between two nonmetal atoms. 
E) the attraction between two metal atoms. 
A) the sharing of electrons. 
B) the transfer of electrons from one atom to another. 
C) the attraction that holds the atoms together in a polyatomic ion. 
D) the attraction between two nonmetal atoms. 
E) the attraction between two metal atoms.

Question 14

Calculate the mass percent composition of lithium in Li3PO4.

Accepted Answer

A) 26.75% 
B) 17.98% 
C) 30.72% 
D) 55.27% 
E) 20.82% 
A) 26.75% 
B) 17.98% 
C) 30.72% 
D) 55.27% 
E) 20.82%

Question 15

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 16

What is the molar mass of nitrogen gas?

Accepted Answer

A) 14.0 g mol-1 
B) 28.0 g mol-1 
C) 6.02 × 1023 g mol-1 
D) 1.20 × 1023 g mol-1 
A) 14.0 g mol-1 
B) 28.0 g mol-1 
C) 6.02 × 1023 g mol-1 
D) 1.20 × 1023 g mol-1

Question 17

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

Accepted Answer

A) CO2 
B) H2O 
C) CH4 
D) LiBr 
E) H2 
A) CO2 
B) H2O 
C) CH4 
D) LiBr 
E) H2

Question 18

Match the following.

-iodine

Accepted Answer

A) H(g) 
B) Ca2(s) 
C) I(s) 
D) Ne2(g) 
E) I2(s)
F)Ne(g)
G)Cl2(g)
H)Cl(g)
I)Ca(s)
J)H2(g)
K)O(g)
L)O2(g) 
A) H(g) 
B) Ca2(s) 
C) I(s) 
D) Ne2(g) 
E) I2(s)
F)Ne(g)
G)Cl2(g)
H)Cl(g)
I)Ca(s)
J)H2(g)
K)O(g)
L)O2(g)

Question 19

How many cations are there in 10.0 g of sodium phosphate?

Accepted Answer

A) 3.67 × 1022 cations 
B) 1.10 × 1023 cations 
C) 9.87 × 1024 cations 
D) 2.96 × 1025 cations 
A) 3.67 × 1022 cations 
B) 1.10 × 1023 cations 
C) 9.87 × 1024 cations 
D) 2.96 × 1025 cations

Question 20

What is the empirical formula of a substance that contains 2.64 g of C, 0.887 g of H, and 3.52 g of O?

Accepted Answer

A) CH4O  
B) C2H4O2 
C) C2H4O3 
D) C3H4O4 
A) CH4O  
B) C2H4O2 
C) C2H4O3 
D) C3H4O4

Exam 3: Molecules, Compounds, and Nomenclature

Formic acid, HCOOH, is a major component in ant bites. Calculate the mass, in grams, of 3.14 × 1023 molecules of formic acid.

Identify the cyanide ion.

The ion IO2- is named

Which of the following compounds is ethanol?

The molecular weight of sucrose ( C12H22O11 ), table sugar, is ________ amu (rounded to one decimal place).

Which of the following is an acid in aqueous solution?

How many moles of PCl3 contain 3.68 × 1025 chlorine atoms?

Rb2S is named

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

Which of the following is an ionic compound?

How many Fe(II)ions are there in 20.0 g of FeSO4?

Identify the name for H2SO4.

An ionic bond is best described as

Calculate the mass percent composition of lithium in Li3PO4.

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

What is the molar mass of nitrogen gas?

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

Match the following. -iodine

How many cations are there in 10.0 g of sodium phosphate?

What is the empirical formula of a substance that contains 2.64 g of C, 0.887 g of H, and 3.52 g of O?

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

Formic acid, HCOOH, is a major component in ant bites. Calculate the mass, in grams, of 3.14 × 10²³molecules of formic acid.

The ion IO₂^- is named

The molecular weight of sucrose ( C₁₂H₂₂O₁₁ ), table sugar, is ________ amu (rounded to one decimal place).

How many moles of PCl₃ contain 3.68 × 10²⁵ chlorine atoms?

Rb₂S is named

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

How many Fe(II)ions are there in 20.0 g of FeSO₄?

Identify the name for H₂SO₄.

Calculate the mass percent composition of lithium in Li₃PO₄.

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