Question 1

How many protons are in arsenic?

Accepted Answer

A) 33 
B) 41 
C) 42 
D) 41.9 
E) 75 
A) 33 
B) 41 
C) 42 
D) 41.9 
E) 75

Question 2

Bromine has two naturally occurring isotopes, Br-79 and Br-81. The mass of Br-79 is 78.92 amu with a percent abundance of 50.69%. If the atomic mass of bromine is 79.904 amu, calculate the mass and percent abundance of Br-81.

Accepted Answer

A) 80.916 amu and 50.69% 
B) 78.921 amu and 49.31% 
C) 79.904 amu and 49.31% 
D) 80.913 amu and 49.31% 
E) 80.028 amu and 50.31% 
A) 80.916 amu and 50.69% 
B) 78.921 amu and 49.31% 
C) 79.904 amu and 49.31% 
D) 80.913 amu and 49.31% 
E) 80.028 amu and 50.31%

Question 3

Bromine has two naturally occurring isotopes, Br-79 and Br-81. The atomic mass of Br-79 is 78.9183 amu with a percent abundance of 50.69% and the atomic mass of Br-81 is 80.9163 amu. Calculate the atomic mass of bromine.

Accepted Answer

A) 80.91 amu 
B) 78.92 amu 
C) 79.90 amu 
D) 80.92 amu 
E) 80.03 amu 
A) 80.91 amu 
B) 78.92 amu 
C) 79.90 amu 
D) 80.92 amu 
E) 80.03 amu

Question 4

Which of the following elements is a gas at room temperature?

Accepted Answer

A) bromine 
B) carbon 
C) helium 
D) sodium 
A) bromine 
B) carbon 
C) helium 
D) sodium

Question 5

In a 41.5 g sample of carbon, how many atoms have a mass of 12.0107?

Accepted Answer

A) 2.08 × 1024 
B) 3.00 × 1026 
C) 12 
D) 1.2 × 1021 
E) 0 
A) 2.08 × 1024 
B) 3.00 × 1026 
C) 12 
D) 1.2 × 1021 
E) 0

Question 6

The number 6.022 × 1023 is known as ________.

Accepted Answer

Question 7

Barium belongs to the ________ group of the periodic table.

Accepted Answer

A) alkali metal 
B) alkaline earth metal 
C) halogen 
D) noble gas 
A) alkali metal 
B) alkaline earth metal 
C) halogen 
D) noble gas

Question 8

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 9

Gallium has an atomic mass of 69.723 amu. The abundance of Ga-69 (68.926 amu)is 60.11%. What is the atomic mass, in amu, of the other isotope?

Accepted Answer

A) 70.924 amu 
B) 70.928 amu 
C) 70.932 amu 
D) 70.920 amu 
E) 70.930 amu 
A) 70.924 amu 
B) 70.928 amu 
C) 70.932 amu 
D) 70.920 amu 
E) 70.930 amu

Question 10

Match the following.

-iron

Accepted Answer

A) Si 
B) Fe 
C) Mg 
D) C 
E) K 
A) Si 
B) Fe 
C) Mg 
D) C 
E) K

Question 11

Which of the following statements is TRUE?

Accepted Answer

A) Halogens are very reactive metals. 
B) The alkali metals are fairly reactive. 
C) Sulfur is a transition-group element. 
D) Noble gases readily form ionic compounds. 
E) Zn is a main-group metal. 
A) Halogens are very reactive metals. 
B) The alkali metals are fairly reactive. 
C) Sulfur is a transition-group element. 
D) Noble gases readily form ionic compounds. 
E) Zn is a main-group metal.

Question 12

What is the chemical symbol for mercury?

Accepted Answer

A) Ag 
B) Au 
C) Hg 
D) Pb 
A) Ag 
B) Au 
C) Hg 
D) Pb

Question 13

Which of the following contains the MOST atoms? You shouldn't need to do a calculation here.

Accepted Answer

A) 10.0 g Ne 
B) 10.0 g He 
C) 10.0 g Ar 
D) 10.0 g Kr 
E) 10.0 g Mg 
A) 10.0 g Ne 
B) 10.0 g He 
C) 10.0 g Ar 
D) 10.0 g Kr 
E) 10.0 g Mg

Question 14

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 15

All samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements. Which law does this refer to?

Accepted Answer

A) Law of definite proportions 
B) Law of the conservation of mass 
C) Law of modern atomic theory 
D) Law of multiple proportions 
E) First law of thermodynamics 
A) Law of definite proportions 
B) Law of the conservation of mass 
C) Law of modern atomic theory 
D) Law of multiple proportions 
E) First law of thermodynamics

Question 16

How many iron atoms are contained in 354 g of iron?

Accepted Answer

A) 2.62 × 1025 Fe atoms 
B) 2.13 × 1026 Fe atoms 
C) 4.69 × 1024 Fe atoms 
D) 3.82 × 1024 Fe atoms 
E) 9.50 × 1022 Fe atoms 
A) 2.62 × 1025 Fe atoms 
B) 2.13 × 1026 Fe atoms 
C) 4.69 × 1024 Fe atoms 
D) 3.82 × 1024 Fe atoms 
E) 9.50 × 1022 Fe atoms

Question 17

Which of the following elements is an alkaline earth metal?

Accepted Answer

A) Cs 
B) Cu 
C) Mg 
D) Ti 
E) Br 
A) Cs 
B) Cu 
C) Mg 
D) Ti 
E) Br

Question 18

What does "X" represent in the following symbol?

Accepted Answer

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

Question 19

Identify the number of electrons in P-3.

Accepted Answer

A) 18 
B) 12 
C) 19 
D) 15 
E) 16 
A) 18 
B) 12 
C) 19 
D) 15 
E) 16

Question 20

Identify the element that has an atomic number of 40.

Accepted Answer

A) neon 
B) calcium 
C) zirconium 
D) bromine 
A) neon 
B) calcium 
C) zirconium 
D) bromine

Exam 2: Atoms and Elements

How many protons are in arsenic?

Bromine has two naturally occurring isotopes, Br-79 and Br-81. The mass of Br-79 is 78.92 amu with a percent abundance of 50.69%. If the atomic mass of bromine is 79.904 amu, calculate the mass and percent abundance of Br-81.

Bromine has two naturally occurring isotopes, Br-79 and Br-81. The atomic mass of Br-79 is 78.9183 amu with a percent abundance of 50.69% and the atomic mass of Br-81 is 80.9163 amu. Calculate the atomic mass of bromine.

Which of the following elements is a gas at room temperature?

In a 41.5 g sample of carbon, how many atoms have a mass of 12.0107?

The number 6.022 × 1023 is known as ________.

Barium belongs to the ________ group of the periodic table.

Which of the following statements about subatomic particles is TRUE?

Gallium has an atomic mass of 69.723 amu. The abundance of Ga-69 (68.926 amu)is 60.11%. What is the atomic mass, in amu, of the other isotope?

Match the following. -iron

Which of the following statements is TRUE?

What is the chemical symbol for mercury?

Which of the following contains the MOST atoms? You shouldn't need to do a calculation here.

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

All samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements. Which law does this refer to?

How many iron atoms are contained in 354 g of iron?

Which of the following elements is an alkaline earth metal?

What does "X" represent in the following symbol?

Identify the number of electrons in P-3.

Identify the element that has an atomic number of 40.

Units of Measurement for Physical and Chemical Change

Molecules, Compounds, and Nomenclature

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

The number 6.022 × 10²³ is known as ________.

Identify the number of electrons in P^-3.