Question 1

How many iron atoms are present in 0.552 mol of iron?

Accepted Answer

A) 2.798 × 1024 
B) 6.02 × 1023 
C) 27.98 
D) 3.32 × 1023 
E) 55.85 
A) 2.798 × 1024 
B) 6.02 × 1023 
C) 27.98 
D) 3.32 × 1023 
E) 55.85

Question 2

What is the mass of one mole of diatomic hydrogen,H2?

Accepted Answer

A) 1.01 amu 
B) 2.02 amu 
C) 1.01 g 
D) 2.02 g 
E) 6.022 × 1023 g 
A) 1.01 amu 
B) 2.02 amu 
C) 1.01 g 
D) 2.02 g 
E) 6.022 × 1023 g

Question 3

The formula mass of water is 18.02 g.

Accepted Answer

A) True 
 B)False

Question 4

How many moles of Au atoms are present in one ounce of pure gold? [1 oz = 28.4 g]

Accepted Answer

A) 1.97 × 102 mol 
B) 6.94 mol 
C) 0.144 mol 
D) 0.0721 mol 
E) 5.08 × 10-3 mol 
A) 1.97 × 102 mol 
B) 6.94 mol 
C) 0.144 mol 
D) 0.0721 mol 
E) 5.08 × 10-3 mol

Question 5

What is the mass of a 0.150 mole sample of sulfur?

Accepted Answer

A) 5.17 g 
B) 4.68 g 
C) 214 g 
D) 0.208 g 
E) 4.81 g 
A) 5.17 g 
B) 4.68 g 
C) 214 g 
D) 0.208 g 
E) 4.81 g

Question 6

Counting the number of moles on both the reactant and product sides of an equation is the first step in balancing the equation.

Accepted Answer

A) True 
 B)False

Question 7

The mass of one atom of oxygen is 16.00 amu.What is the mass of one mole of elemental oxygen (O2)?

Accepted Answer

A) 32.00 amu 
B) 32.00 g 
C) 9.64 × 1024 g 
D) 1.93 × 1025 g 
E) 1.88 × 1022 g 
A) 32.00 amu 
B) 32.00 g 
C) 9.64 × 1024 g 
D) 1.93 × 1025 g 
E) 1.88 × 1022 g

Question 8

Classify the following reaction: Ce4+(aq)+ Fe2+(aq)→ Ce3+(aq)+ Fe3+(aq)

Accepted Answer

A) precipitation 
B) acid - base 
C) oxidation - reduction 
D) decomposition 
E) neutralization 
A) precipitation 
B) acid - base 
C) oxidation - reduction 
D) decomposition 
E) neutralization

Question 9

How is the reaction shown below best classified? Ca(s)+ 2HCl(aq)→ CaCl2(g)+ H2(g)

Accepted Answer

A) decomposition 
B) combination 
C) single-replacement 
D) double-replacement 
E) precipitation 
A) decomposition 
B) combination 
C) single-replacement 
D) double-replacement 
E) precipitation

Question 10

Upon mixing a clear colorless BaCl2 solution with a clear,colorless Na2SO4 solution according to the reaction below,a student observes a white cloudiness form.What is responsible for the cloudiness that is observed? BaCl2(aq)+ Na2SO4(aq)→ BaSO4(s)+ 2NaCl(aq)

Accepted Answer

A) NaCl 
B) BaSO4 
C) BaCl2 
D) Na2SO4 
E) It is impossible to tell without doing the reaction oneself. 
A) NaCl 
B) BaSO4 
C) BaCl2 
D) Na2SO4 
E) It is impossible to tell without doing the reaction oneself.

Question 11

One mole of H2O contains a total of 6.022 × 1023 atoms.

Accepted Answer

A) True 
 B)False

Question 12

The unbalanced equation for the combustion of octane,a component of gasoline,is shown below.What would be the coefficient of carbon dioxide once the equation is balanced? C8H18(l)+ O2(g)→ CO2(g)+ H2O(l)

Accepted Answer

A) 8 
B) 25 
C) 16 
D) 18 
E) No coefficient would be shown. 
A) 8 
B) 25 
C) 16 
D) 18 
E) No coefficient would be shown.

Question 13

How many molecules of water are present in a 5.65 mole sample of water?

Accepted Answer

A) 4.00 × 1024 molecules 
B) 1.07 × 1023 molecules 
C) 3.40 × 1024 molecules 
D) 9.39 × 10−24 molecules 
E) 4.00 × 1025 molecules 
A) 4.00 × 1024 molecules 
B) 1.07 × 1023 molecules 
C) 3.40 × 1024 molecules 
D) 9.39 × 10−24 molecules 
E) 4.00 × 1025 molecules

Question 14

Incomplete combustion occurs when there is insufficient oxygen to react with a compound.The suffocating gas carbon monoxide is a product of incomplete combustion.How many moles of oxygen gas are required for the complete combustion of 11.0 moles of C6H14,a component of gasoline? C6H14(l)+ 19O2(g)→ 12CO2(g)+ 14H2O(l)

Accepted Answer

A) 1.16 mol O2 
B) 28.0 mol O2 
C) 105 mol O2 
D) 209 mol O2 
E) 418 mol O2 
A) 1.16 mol O2 
B) 28.0 mol O2 
C) 105 mol O2 
D) 209 mol O2 
E) 418 mol O2

Question 15

How many molecules are present in a 0.0200 mol sample of nicotine?

Accepted Answer

A) 0.0400 molecules 
B) 1.20 × 1022 molecules 
C) 2.41 × 1022 molecules 
D) 6.02 × 1023 molecules 
E) 1.20 × 1023 molecules 
A) 0.0400 molecules 
B) 1.20 × 1022 molecules 
C) 2.41 × 1022 molecules 
D) 6.02 × 1023 molecules 
E) 1.20 × 1023 molecules

Question 16

One mole of iron contains 6.022 × 1023 grams of Fe.

Accepted Answer

A) True 
 B)False

Question 17

In an acid-base reaction,what is transferred from the acid to the base?

Accepted Answer

A) an electron 
B) a hydrogen cation,H+ 
C) a chloride anion,Cl- 
D) a sodium cation,Na+ 
E) a hydroxide anion,OH- 
A) an electron 
B) a hydrogen cation,H+ 
C) a chloride anion,Cl- 
D) a sodium cation,Na+ 
E) a hydroxide anion,OH-

Question 18

Consider the two beakers labeled A and B.Beaker A contains 1 mole of iron atoms,and Beaker B contains 1 mole of lead atoms.Which statement concerning these samples is known with certainty?

Accepted Answer

A) Beakers A and B contain an equal number of atoms. 
B) Beakers A and B contain equal masses of atoms. 
C) Beakers A and B contain an equal volume of atoms. 
D) Beakers A and B contain samples with the same density. 
E) None of these are correct. 
A) Beakers A and B contain an equal number of atoms. 
B) Beakers A and B contain equal masses of atoms. 
C) Beakers A and B contain an equal volume of atoms. 
D) Beakers A and B contain samples with the same density. 
E) None of these are correct.

Question 19

One mole of any substance contains Avogadro's number of particles of that substance.What is the numerical value of Avogadro's number?

Accepted Answer

A) 6.022 ×10−23 
B) 1.00 ×10−14 
C) 12.01 
D) 1.661 ×10−24 
E) 6.022 × 1023 
A) 6.022 ×10−23 
B) 1.00 ×10−14 
C) 12.01 
D) 1.661 ×10−24 
E) 6.022 × 1023

Question 20

How is the reaction shown below best classified? 2HgO(s)→ 2Hg(l)+ O2(g)

Accepted Answer

A) decomposition 
B) combination 
C) single-replacement 
D) double-replacement 
E) acid-base reaction 
A) decomposition 
B) combination 
C) single-replacement 
D) double-replacement 
E) acid-base reaction

Exam 4: Calculations, chemical Changes, and the Chemical Equation

How many iron atoms are present in 0.552 mol of iron?

What is the mass of one mole of diatomic hydrogen,H2?

The formula mass of water is 18.02 g.

How many moles of Au atoms are present in one ounce of pure gold? [1 oz = 28.4 g]

What is the mass of a 0.150 mole sample of sulfur?

Counting the number of moles on both the reactant and product sides of an equation is the first step in balancing the equation.

The mass of one atom of oxygen is 16.00 amu.What is the mass of one mole of elemental oxygen (O2)?

Classify the following reaction: Ce4+(aq)+ Fe2+(aq)→ Ce3+(aq)+ Fe3+(aq)

How is the reaction shown below best classified? Ca(s)+ 2HCl(aq)→ CaCl2(g)+ H2(g)

Upon mixing a clear colorless BaCl2 solution with a clear,colorless Na2SO4 solution according to the reaction below,a student observes a white cloudiness form.What is responsible for the cloudiness that is observed? BaCl2(aq)+ Na2SO4(aq)→ BaSO4(s)+ 2NaCl(aq)

One mole of H2O contains a total of 6.022 × 1023 atoms.

The unbalanced equation for the combustion of octane,a component of gasoline,is shown below.What would be the coefficient of carbon dioxide once the equation is balanced? C8H18(l)+ O2(g)→ CO2(g)+ H2O(l)

How many molecules of water are present in a 5.65 mole sample of water?

How many molecules are present in a 0.0200 mol sample of nicotine?

One mole of iron contains 6.022 × 1023 grams of Fe.

In an acid-base reaction,what is transferred from the acid to the base?

Consider the two beakers labeled A and B.Beaker A contains 1 mole of iron atoms,and Beaker B contains 1 mole of lead atoms.Which statement concerning these samples is known with certainty?

One mole of any substance contains Avogadro's number of particles of that substance.What is the numerical value of Avogadro's number?

How is the reaction shown below best classified? 2HgO(s)→ 2Hg(l)+ O2(g)

Chemistry - Methods and Measurement

The Structure of the Atom and the Periodic Table

Structure and Properties of Ionic and Covalent Compounds

States of Matter: Gases, liquids, and Solids

Solutions

Energy,rate and Equilibrium

Acids and Bases

The Nucleus, radioactivity, and Nuclear Medicine

An Introduction to Organic Chemistry

The Unsaturated Hydrocarbons: Alkenes, alkynes, and Aromatics

Alcohols, phenols, thiols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Carboxylic Acid Derivatives

Amines and Amides

Carbohydrates

Lipids and Their Functions in Biochemical Systems

Protein Structure and Function

Enzymes

Introduction to Molecular Genetics

Carbohydrate Metabolism

Aerobic Respiration and Energy Production

Fatty Acid Metabolism

Filters

What is the mass of one mole of diatomic hydrogen,H₂?

The mass of one atom of oxygen is 16.00 amu.What is the mass of one mole of elemental oxygen (O₂)?

Classify the following reaction: Ce⁴⁺(aq)+ Fe²⁺(aq)→ Ce³⁺(aq)+ Fe³⁺(aq)

How is the reaction shown below best classified? Ca(s)+ 2HCl(aq)→ CaCl₂(g)+ H₂(g)

Upon mixing a clear colorless BaCl₂ solution with a clear,colorless Na₂SO₄ solution according to the reaction below,a student observes a white cloudiness form.What is responsible for the cloudiness that is observed? BaCl₂(aq)+ Na₂SO₄(aq)→ BaSO₄(s)+ 2NaCl(aq)

One mole of H₂O contains a total of 6.022 × 10²³ atoms.

The unbalanced equation for the combustion of octane,a component of gasoline,is shown below.What would be the coefficient of carbon dioxide once the equation is balanced? C₈H₁₈(l)+ O₂(g)→ CO₂(g)+ H₂O(l)

One mole of iron contains 6.022 × 10²³ grams of Fe.

How is the reaction shown below best classified? 2HgO(s)→ 2Hg(l)+ O₂(g)