Question 1

How many moles of Cs are contained in 595 kg of Cs?

Accepted Answer

A)  2.23 × 102 moles Cs 
B)  4.48 × 103 moles Cs 
C)  7.91 × 104 moles Cs 
D)  1.26 × 103 moles Cs 
E)  5.39 × 102 moles Cs 
A)  2.23 × 102 moles Cs 
B)  4.48 × 103 moles Cs 
C)  7.91 × 104 moles Cs 
D)  1.26 × 103 moles Cs 
E)  5.39 × 102 moles Cs

Question 2

What does "X" represent in the following symbol?   X

Accepted Answer

A)  mercury 
B)  chlorine 
C)  scandium 
D)  bromine 
E)  selenium 
A)  mercury 
B)  chlorine 
C)  scandium 
D)  bromine 
E)  selenium

Question 3

Rutherford proposed the

Accepted Answer

A)  atomic bomb. 
B)  hydroelectric. 
C)  First Law of Conservation. 
D)  theory of explosives. 
E)  nuclear theory. 
A)  atomic bomb. 
B)  hydroelectric. 
C)  First Law of Conservation. 
D)  theory of explosives. 
E)  nuclear theory.

Question 4

An atom of 25Mg contains ________ electrons.

Accepted Answer

A)  25 
B)  37 
C)  13 
D)  23 
E)  12 
A)  25 
B)  37 
C)  13 
D)  23 
E)  12

Question 5

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

Accepted Answer

A)  F-, Ne, Mg2+ 
B)  C, N3-, O2- 
C)  Sr2+, Ba2+, Ra2+ 
D)  S, S2-, S2+ 
A)  F-, Ne, Mg2+ 
B)  C, N3-, O2- 
C)  Sr2+, Ba2+, Ra2+ 
D)  S, S2-, S2+

Question 6

Which of the following statements about subatomic particles is TRUE?

Accepted Answer

A)  A neutral atom contains the same number of protons and electrons. 
B)  Protons have about the same mass as electrons. 
C)  Electrons make up most of the mass of an atom. 
D)  Protons and neutrons have opposite, but equal in magnitude, charges. 
E)  Neutrons and electrons are found in the nucleus of an atom. 
A)  A neutral atom contains the same number of protons and electrons. 
B)  Protons have about the same mass as electrons. 
C)  Electrons make up most of the mass of an atom. 
D)  Protons and neutrons have opposite, but equal in magnitude, charges. 
E)  Neutrons and electrons are found in the nucleus of an atom.

Question 7

The mass number is equal to

Accepted Answer

A)  the sum of the number of the electrons and protons. 
B)  the sum of the number of the neutrons and electrons. 
C)  the sum of the number of protons, neutrons, and electrons. 
D)  the sum of the number of protons and neutrons. 
A)  the sum of the number of the electrons and protons. 
B)  the sum of the number of the neutrons and electrons. 
C)  the sum of the number of protons, neutrons, and electrons. 
D)  the sum of the number of protons and neutrons.

Question 8

Describe an atom and what it is made up of according to modern atomic theory.

Accepted Answer

An atom is made up of a nucleus surround

Question 9

Calculate the mass (in kg)of 4.87 × 1025 atoms of Zn.

Accepted Answer

A)  5.29 kg 
B)  1.89 kg 
C)  8.09 kg 
D)  1.24 kg 
E)  1.09 kg 
A)  5.29 kg 
B)  1.89 kg 
C)  8.09 kg 
D)  1.24 kg 
E)  1.09 kg

Question 10

All of the following elements are nonmetals EXCEPT

Accepted Answer

A)  barium. 
B)  nitrogen. 
C)  oxygen.. 
D)  argon. 
E)  flourine. 
A)  barium. 
B)  nitrogen. 
C)  oxygen.. 
D)  argon. 
E)  flourine.

Question 11

What species is represented by the following information? p+ = 12 n° = 14 e- = 10

Accepted Answer

A)  Si4+ 
B)  Mg 
C)  Ne 
D)  Si 
E)  Mg2+ 
A)  Si4+ 
B)  Mg 
C)  Ne 
D)  Si 
E)  Mg2+

Question 12

What group of elements in the periodic table are the most unreactive and why?

Accepted Answer

The noble gases are the most u

Question 13

Describe the difference between ions and isotopes.

Accepted Answer

Ions have the loss o

Question 14

How many atoms are in 2.50 moles of N?

Accepted Answer

A)  4.52 × 1024 atoms 
B)  1.51 × 1024 atoms 
C)  5.02 × 1023 atoms 
D)  3.01 × 1024 atoms 
E)  7.53 × 1023 atoms 
A)  4.52 × 1024 atoms 
B)  1.51 × 1024 atoms 
C)  5.02 × 1023 atoms 
D)  3.01 × 1024 atoms 
E)  7.53 × 1023 atoms

Question 15

What element is defined by the following information? p+ = 17 n° = 20 e- = 17

Accepted Answer

A)  calcium 
B)  rubidium 
C)  chlorine 
D)  neon 
E)  oxygen 
A)  calcium 
B)  rubidium 
C)  chlorine 
D)  neon 
E)  oxygen

Question 16

Calculate the atomic mass of gallium if gallium has 2 naturally occurring isotopes with the following masses and natural abundances: Ga-69 68.9256 amu 60.11%
Ga-71 70.9247 amu 39.89%

Accepted Answer

A)  69.72 amu 
B)  69.93 amu 
C)  70.00 amu 
D)  69.80 amu 
E)  70.68 amu 
A)  69.72 amu 
B)  69.93 amu 
C)  70.00 amu 
D)  69.80 amu 
E)  70.68 amu

Question 17

What mass (in mg)does 2.63 moles of nickel have?

Accepted Answer

A)  44.8 mg 
B)  2.23 × 104 mg 
C)  129 mg 
D)  3.56 × 105 mg 
E)  1.54 × 105 mg 
A)  44.8 mg 
B)  2.23 × 104 mg 
C)  129 mg 
D)  3.56 × 105 mg 
E)  1.54 × 105 mg

Question 18

Identify a cation.

Accepted Answer

A)  an atom that has lost an electron 
B)  an atom that has gained an electron 
C)  an atom that has lost a proton 
D)  an atom that has gained a neutron 
A)  an atom that has lost an electron 
B)  an atom that has gained an electron 
C)  an atom that has lost a proton 
D)  an atom that has gained a neutron

Question 19

Identify the discovery that Thomson made.

Accepted Answer

A)  a neutron 
B)  an electron 
C)  the charge of a single electron 
D)  an alpha particle 
E)  anions 
A)  a neutron 
B)  an electron 
C)  the charge of a single electron 
D)  an alpha particle 
E)  anions

Question 20

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

Accepted Answer

A)  Cl-, Ar, Ca2+ 
B)  C, N3-, O2- 
C)  K+, Rb+, Cs+ 
D)  Br, Br-, Br+ 
A)  Cl-, Ar, Ca2+ 
B)  C, N3-, O2- 
C)  K+, Rb+, Cs+ 
D)  Br, Br-, Br+

Exam 2: Atoms and Elements

How many moles of Cs are contained in 595 kg of Cs?

What does "X" represent in the following symbol? X

Rutherford proposed the

An atom of 25Mg contains ________ electrons.

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

Which of the following statements about subatomic particles is TRUE?

The mass number is equal to

Describe an atom and what it is made up of according to modern atomic theory.

Calculate the mass (in kg)of 4.87 × 1025 atoms of Zn.

All of the following elements are nonmetals EXCEPT

What species is represented by the following information? p+ = 12 n° = 14 e- = 10

What group of elements in the periodic table are the most unreactive and why?

Describe the difference between ions and isotopes.

How many atoms are in 2.50 moles of N?

What element is defined by the following information? p+ = 17 n° = 20 e- = 17

Calculate the atomic mass of gallium if gallium has 2 naturally occurring isotopes with the following masses and natural abundances: Ga-69 68.9256 amu 60.11% Ga-71 70.9247 amu 39.89%

What mass (in mg)does 2.63 moles of nickel have?

Identify a cation.

Identify the discovery that Thomson made.

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

Matter, measurement, and Problem Solving

Molecules,compounds,and Chemical Equations

Chemical Quantities and Aqueous Reactions

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,

Liquids,solids,and Intermolecular Forces

Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

An atom of ²⁵Mg contains ________ electrons.

Calculate the mass (in kg)of 4.87 × 10²⁵ atoms of Zn.

What species is represented by the following information? p⁺ = 12 n° = 14 e^- = 10

What element is defined by the following information? p⁺ = 17 n° = 20 e^- = 17