Question 1

Which nuclide below is most likely to decay by electron capture?

Accepted Answer

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

Question 2

The solid compound,Mg(NO3)2,contains

Accepted Answer

A) Mg2+,N5+,and O2- ions. 
B) Mg2+ ions and (NO32- ions. 
C) Mg 2+ and (NO32- ions. 
D) Mg(NO3)2 molecules. 
A) Mg2+,N5+,and O2- ions. 
B) Mg2+ ions and (NO32- ions. 
C) Mg 2+ and (NO32- ions. 
D) Mg(NO3)2 molecules.

Question 3

The compound,SO3,is named

Accepted Answer

A) sulfate. 
B) sulfite. 
C) sulfur trioxide. 
D) sulfur ( VI)oxide. 
A) sulfate. 
B) sulfite. 
C) sulfur trioxide. 
D) sulfur ( VI)oxide.

Question 4

The nuclear transformation potassium-40 argon-40 + ? is classified as

Accepted Answer

A) alpha emission. 
B) beta emission. 
C) electron capture. 
D) positron emission. 
A) alpha emission. 
B) beta emission. 
C) electron capture. 
D) positron emission.

Question 5

Which of the following statements about positrons is false?

Accepted Answer

A) The positron has same mass as an electron. 
B) A positron is ejected from the nucleus during the conversion of a proton into a neutron. 
C) A positron is a positive electron. 
D) When positron emission occurs,the atomic number of the nucleus increases. 
A) The positron has same mass as an electron. 
B) A positron is ejected from the nucleus during the conversion of a proton into a neutron. 
C) A positron is a positive electron. 
D) When positron emission occurs,the atomic number of the nucleus increases.

Question 6

What is the mass of one atom of the element hydrogen?

Accepted Answer

A) 2)0 g 
B) 1)0 g 
C) 3)4 × 10-24 g 
D) 1)7 × 10-24 g 
A) 2)0 g 
B) 1)0 g 
C) 3)4 × 10-24 g 
D) 1)7 × 10-24 g

Question 7

The chemical formula for potassium peroxide is

Accepted Answer

A) KOH. 
B) KO2. 
C) K2O. 
D) K2O2. 
A) KOH. 
B) KO2. 
C) K2O. 
D) K2O2.

Question 8

What type of bonding is found in the compound O F2?

Accepted Answer

A) covalent bonding 
B) hydrogen bonding 
C) ionic bonding 
D) metallic bonding 
A) covalent bonding 
B) hydrogen bonding 
C) ionic bonding 
D) metallic bonding

Question 9

What is the standard isotope that is used to define the number of atoms in a mole?

Accepted Answer

A) (1H) 
B) (12
C)  
C) (16O) 
D) (20Ne) 
A) (1H) 
B) (12
C)  
C) (16O) 
D) (20Ne)

Question 10

The smallest sample of carbon atoms that can be observed with the naked eye has a mass of approximately 2 × 10-8 g.Given that 1 g = 6.02 × 1023 amu,and that carbon has an atomic weight of 12.01 amu,determine the number of carbon atoms present in the sample.

Accepted Answer

A) 1 × 1015 
B) 1 × 1016 
C) 1 × 1017 
D) 6 × 1023 
A) 1 × 1015 
B) 1 × 1016 
C) 1 × 1017 
D) 6 × 1023

Question 11

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 12

Use the periodic table below to answer the following questions.  
-Which elements commonly form cations?

Accepted Answer

A) A and B 
B) A and C 
C) B and D 
D) C and D 
A) A and B 
B) A and C 
C) B and D 
D) C and D

Question 13

How many protons (p)and neutrons (n)are in an atom of calcium-46?

Accepted Answer

A) 20 p,26 n 
B) 20 p,46 n 
C) 26 p,20 n 
D) 46 p,60 n 
A) 20 p,26 n 
B) 20 p,46 n 
C) 26 p,20 n 
D) 46 p,60 n

Question 14

An element has two naturally occurring isotopes.One has an abundance of 37.4% and an isotopic mass of 184.953 amu,and the other has an abundance of 62.6% and a mass of 186.956 amu.What is the atomic weight of the element?

Accepted Answer

A) 185.702 amu 
B) 185.954 amu 
C) 186.207 amu 
D) 186.956 amu 
A) 185.702 amu 
B) 185.954 amu 
C) 186.207 amu 
D) 186.956 amu

Question 15

The compound,Cu( I O3  )2,is named

Accepted Answer

A) copper iodate(II). 
B) copper(I)iodate. 
C) copper(I)iodate(II). 
D) copper(II)iodate. 
A) copper iodate(II). 
B) copper(I)iodate. 
C) copper(I)iodate(II). 
D) copper(II)iodate.

Question 16

Steel is galvanized by giving it a surface coating of zinc.Galvanized steel is an example of

Accepted Answer

A) a compound. 
B) an element. 
C) a heterogeneous mixture. 
D) a homogeneous mixture. 
A) a compound. 
B) an element. 
C) a heterogeneous mixture. 
D) a homogeneous mixture.

Question 17

The ions ClO4-,ClO3-,ClO2-,and ClO- are named respectively

Accepted Answer

A) hypochlorate,chlorate,chlorite,perchlorite. 
B) hypochlorite,chlorite,chlorate,perchlorate. 
C) perchlorate,chlorate,chlorite,hypochlorite. 
D) perchlorite,chlorite,chlorate,hypochlorate. 
A) hypochlorate,chlorate,chlorite,perchlorite. 
B) hypochlorite,chlorite,chlorate,perchlorate. 
C) perchlorate,chlorate,chlorite,hypochlorite. 
D) perchlorite,chlorite,chlorate,hypochlorate.

Question 18

Tell the type of decay process occurring in the following nuclear reaction.

Accepted Answer

A) α emission 
B) β emission 
C) γ emission 
D) electron capture or positron emission 
A) α emission 
B) β emission 
C) γ emission 
D) electron capture or positron emission

Question 19

-What kind of decay process is occurring in the decay of isotope D to isotope E in the figure shown above?

Accepted Answer

A) α emission 
B) β emission 
C) γ emission 
D) electron capture or positron emission 
A) α emission 
B) β emission 
C) γ emission 
D) electron capture or positron emission

Question 20

What is the charge on the Cr ions in Cr2O3?

Accepted Answer

A) 2- 
B) 1+ 
C) 2+ 
D) 3+ 
A) 2- 
B) 1+ 
C) 2+ 
D) 3+

Exam 2: Atoms, molecules, and Ions

Which nuclide below is most likely to decay by electron capture?

The solid compound,Mg(NO3)2,contains

The compound,SO3,is named

The nuclear transformation potassium-40 argon-40 + ? is classified as

Which of the following statements about positrons is false?

What is the mass of one atom of the element hydrogen?

The chemical formula for potassium peroxide is

What type of bonding is found in the compound O F2?

What is the standard isotope that is used to define the number of atoms in a mole?

The smallest sample of carbon atoms that can be observed with the naked eye has a mass of approximately 2 × 10-8 g.Given that 1 g = 6.02 × 1023 amu,and that carbon has an atomic weight of 12.01 amu,determine the number of carbon atoms present in the sample.

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

Use the periodic table below to answer the following questions. -Which elements commonly form cations?

How many protons (p)and neutrons (n)are in an atom of calcium-46?

An element has two naturally occurring isotopes.One has an abundance of 37.4% and an isotopic mass of 184.953 amu,and the other has an abundance of 62.6% and a mass of 186.956 amu.What is the atomic weight of the element?

The compound,Cu( I O3 )2,is named

Steel is galvanized by giving it a surface coating of zinc.Galvanized steel is an example of

The ions ClO4-,ClO3-,ClO2-,and ClO- are named respectively

Tell the type of decay process occurring in the following nuclear reaction.

-What kind of decay process is occurring in the decay of isotope D to isotope E in the figure shown above?

What is the charge on the Cr ions in Cr2O3?

Chemistry: Matter and Measurement

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

The solid compound,Mg(NO₃)₂,contains

The compound,SO₃,is named

What type of bonding is found in the compound O F₂?

The smallest sample of carbon atoms that can be observed with the naked eye has a mass of approximately 2 × 10^-8 g.Given that 1 g = 6.02 × 10²³ amu,and that carbon has an atomic weight of 12.01 amu,determine the number of carbon atoms present in the sample.

The compound,Cu( IO₃ )₂,is named

The ions ClO₄^-,ClO₃^-,ClO₂^-,and ClO^- are named respectively

What is the charge on the Cr ions in Cr₂O₃?