Question 1

The atomic weight of chlorine is very close to 35.5.This means that:

Accepted Answer

A) chlorine occurs with a variable number of protons 
B) a variable number of electrons gives the fractional weight 
C) on the average,an atom of chlorine weighs almost 3 times as much as carbon 
D) the actual weight of a chlorine atom is not known very precisely 
E) chlorine atoms contain half of a proton 
A) chlorine occurs with a variable number of protons 
B) a variable number of electrons gives the fractional weight 
C) on the average,an atom of chlorine weighs almost 3 times as much as carbon 
D) the actual weight of a chlorine atom is not known very precisely 
E) chlorine atoms contain half of a proton C

Question 2

Which is the proper chemical symbol for tungsten?

Accepted Answer

A) Te 
B) Ti 
C) Tm 
D) W 
E) Tc 
A) Te 
B) Ti 
C) Tm 
D) W 
E) Tc D

Question 3

How many Cu atoms are present in a 75.0 cm length of 20-gauge copper wire? A 20-gauge wire has a diameter of 0.03196 in.Copper's density is 8.92 g/cm3.

Accepted Answer

A) 1.31 × 1021  
B) 3.28 × 1022  
C) 8.08 × 1021  
D) 1.04 × 1022  
E) 2.08 × 1022  
A) 1.31 × 1021  
B) 3.28 × 1022  
C) 8.08 × 1021  
D) 1.04 × 1022  
E) 2.08 × 1022  B

Question 4

A cation has 13 neutrons and 10 electrons.If it has a charge of +1,what is its correct symbol?

Accepted Answer

A)      
B)      
C)      
D)      
E)      
A)      
B)      
C)      
D)      
E)

Question 5

How many atoms of hydrogen are present in 1.5 lb of hydrogen peroxide,which is 5.93% hydrogen?

Accepted Answer

A) 2.4 × 1025 atoms 
B) 1.21 × 1025 atoms 
C) 1.2 × 1025 atoms 
D) 2.41 × 1025 atoms 
E) 1.2 × 1020 atoms 
A) 2.4 × 1025 atoms 
B) 1.21 × 1025 atoms 
C) 1.2 × 1025 atoms 
D) 2.41 × 1025 atoms 
E) 1.2 × 1020 atoms

Question 6

Different ratios of atoms produce different compounds.

Accepted Answer

A) True 
 B)False

Question 7

Lead-204 has a relative abundance of 1.48%.What size block of lead (in cubic centimeters)will contain  
Atoms of lead-204? The density of lead is 11.35 g/cm3.

Accepted Answer

A) 3.75 × 10-3 cm3 
B) 0.253 cm3 
C) 194 cm3 
D) 17.1 cm3 
E) 16.8 cm3 
A) 3.75 × 10-3 cm3 
B) 0.253 cm3 
C) 194 cm3 
D) 17.1 cm3 
E) 16.8 cm3

Question 8

What is the mass in grams of 1 atom of sulfur

Accepted Answer

A) 1.661 × 10-24 g 
B) 1.931 × 10-25 g 
C) 5.325 × 10-23 g 
D) 5.179 × 10-26 g 
E) 5.989 × 10-23 g 
A) 1.661 × 10-24 g 
B) 1.931 × 10-25 g 
C) 5.325 × 10-23 g 
D) 5.179 × 10-26 g 
E) 5.989 × 10-23 g

Question 9

An atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has:

Accepted Answer

A) an atomic number of 21 and a mass number of 42 
B) an atomic number of 20 and a mass number of 40 
C) 22 neutrons and 20 protons 
D) 22 protons and 20 neutrons 
A) an atomic number of 21 and a mass number of 42 
B) an atomic number of 20 and a mass number of 40 
C) 22 neutrons and 20 protons 
D) 22 protons and 20 neutrons

Question 10

When a chemical reaction is carried out in a sealed container,the substances may change in color,temperature,or state,but no change in mass is detected.This is evidence of the:

Accepted Answer

A) law of conservation of mass 
B) law of constant composition 
C) law of definite proportions 
D) existence of electrons 
E) existence of protons 
A) law of conservation of mass 
B) law of constant composition 
C) law of definite proportions 
D) existence of electrons 
E) existence of protons

Question 11

Silver possesses two stable isotopes: 107Ag (106.90 u)and 109Ag (108.90 u).If the average atomic mass of Ag is 107.87 u,what is the percent abundance of 107Ag?

Accepted Answer

A) 48.5% 
B) 50.0% 
C) 51.5% 
D) 46.3% 
E) 53.8% 
A) 48.5% 
B) 50.0% 
C) 51.5% 
D) 46.3% 
E) 53.8%

Question 12

Ernest Rutherford is credited with:
I.the nuclear model of the atom
II.the identification of alpha and beta particles
III.the discovery of protons
IV.the prediction of a third,neutral,subatomic particle

Accepted Answer

A) I and II 
B) I and III 
C) I,II,III 
D) II,III,IV 
E) I,II,III,IV 
A) I and II 
B) I and III 
C) I,II,III 
D) II,III,IV 
E) I,II,III,IV

Question 13

Which of the following statements is FALSE?

Accepted Answer

A) Michael Faraday discovered cathode rays. 
B) J .J.Thomson suggested the "plum pudding" model of the atom. 
C) Robert Millikan determined the charge on an electron. 
D) J.J.Thomson determined the mass-to-charge ratio for electrons. 
E) Michael Faraday determined that cathode rays were the fundamental negatively charged particles and called them electrons. 
A) Michael Faraday discovered cathode rays. 
B) J .J.Thomson suggested the "plum pudding" model of the atom. 
C) Robert Millikan determined the charge on an electron. 
D) J.J.Thomson determined the mass-to-charge ratio for electrons. 
E) Michael Faraday determined that cathode rays were the fundamental negatively charged particles and called them electrons.

Question 14

How many electrons are in a neutral atom of bromine-81?

Accepted Answer

A) 1 
B) 35 
C) 36 
D) 81 
A) 1 
B) 35 
C) 36 
D) 81

Question 15

What is the identity of element Q if the ion Q2+ contains 10 electrons?

Accepted Answer

A) C 
B) O 
C) Ne 
D) Mg 
A) C 
B) O 
C) Ne 
D) Mg

Question 16

57.7 g Ni contains how many atoms?

Accepted Answer

A) 6.13 × 1023 atoms 
B) 3.47 × 1023 atoms 
C) 5.92 × 1023 atoms 
D) 1.24 × 1024 atoms 
E) 0.983 atoms 
A) 6.13 × 1023 atoms 
B) 3.47 × 1023 atoms 
C) 5.92 × 1023 atoms 
D) 1.24 × 1024 atoms 
E) 0.983 atoms

Question 17

In which of the following sets do all species have the same number of protons?

Accepted Answer

A) F-,Ne,Mg2+ 
B) Ge,Se2-,Br- 
C) K+,Rb+,Cs+ 
D) Br,Br-,Br+ 
A) F-,Ne,Mg2+ 
B) Ge,Se2-,Br- 
C) K+,Rb+,Cs+ 
D) Br,Br-,Br+

Question 18

What is the element symbol for an atom that has 5 protons and 6 neutrons?

Accepted Answer

A) B 
B) C 
C) H 
D) Na 
A) B 
B) C 
C) H 
D) Na

Question 19

The total numbers of neutrons,protons,and electrons in 138Ba2+ are ________.

Accepted Answer

A) 138 neutrons,56 protons,54 electrons 
B) 82 neutrons,56 protons,54 electrons 
C) 56 neutrons,82 protons,80 electrons 
D) 82 neutrons,56 protons,58 electrons 
E) 82 neutrons,82 protons,82 electrons 
A) 138 neutrons,56 protons,54 electrons 
B) 82 neutrons,56 protons,54 electrons 
C) 56 neutrons,82 protons,80 electrons 
D) 82 neutrons,56 protons,58 electrons 
E) 82 neutrons,82 protons,82 electrons

Question 20

A hypothetical element,E,has two stable isotopes:
E-46 = 46.046 u 64.08%
E-51 = 50.826 u 35.92%
What is the average atom weight of the element?

Accepted Answer

A) 47.76 u 
B) 48.44 u 
C) 49.11 u 
D) 48.50 u 
E) 47.44 u 
A) 47.76 u 
B) 48.44 u 
C) 49.11 u 
D) 48.50 u 
E) 47.44 u

Exam 2: Atoms and the Atomic Theory

The atomic weight of chlorine is very close to 35.5.This means that:

Which is the proper chemical symbol for tungsten?

How many Cu atoms are present in a 75.0 cm length of 20-gauge copper wire? A 20-gauge wire has a diameter of 0.03196 in.Copper's density is 8.92 g/cm3.

A cation has 13 neutrons and 10 electrons.If it has a charge of +1,what is its correct symbol?

How many atoms of hydrogen are present in 1.5 lb of hydrogen peroxide,which is 5.93% hydrogen?

Different ratios of atoms produce different compounds.

Lead-204 has a relative abundance of 1.48%.What size block of lead (in cubic centimeters)will contain Atoms of lead-204? The density of lead is 11.35 g/cm3.

What is the mass in grams of 1 atom of sulfur

An atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has:

When a chemical reaction is carried out in a sealed container,the substances may change in color,temperature,or state,but no change in mass is detected.This is evidence of the:

Silver possesses two stable isotopes: 107Ag (106.90 u)and 109Ag (108.90 u).If the average atomic mass of Ag is 107.87 u,what is the percent abundance of 107Ag?

Ernest Rutherford is credited with: I.the nuclear model of the atom II.the identification of alpha and beta particles III.the discovery of protons IV.the prediction of a third,neutral,subatomic particle

Which of the following statements is FALSE?

How many electrons are in a neutral atom of bromine-81?

What is the identity of element Q if the ion Q2+ contains 10 electrons?

57.7 g Ni contains how many atoms?

In which of the following sets do all species have the same number of protons?

What is the element symbol for an atom that has 5 protons and 6 neutrons?

The total numbers of neutrons,protons,and electrons in 138Ba2+ are ________.

A hypothetical element,E,has two stable isotopes: E-46 = 46.046 u 64.08% E-51 = 50.826 u 35.92% What is the average atom weight of the element?

Matter: Its Properties and Measurement

Chemical Compounds

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 Cu atoms are present in a 75.0 cm length of 20-gauge copper wire? A 20-gauge wire has a diameter of 0.03196 in.Copper's density is 8.92 g/cm³.

Lead-204 has a relative abundance of 1.48%.What size block of lead (in cubic centimeters)will contain Atoms of lead-204? The density of lead is 11.35 g/cm³.

Silver possesses two stable isotopes: ¹⁰⁷Ag (106.90 u)and ¹⁰⁹Ag (108.90 u).If the average atomic mass of Ag is 107.87 u,what is the percent abundance of ¹⁰⁷Ag?

What is the identity of element Q if the ion Q²⁺ contains 10 electrons?

The total numbers of neutrons,protons,and electrons in ¹³⁸Ba²⁺ are ________.