Question 1

A 3.45 gram sample of hematite (Fe2O₃) that contains 2.41 grams of Fe has what percentage Fe by mass?

Accepted Answer

A)  41.0% 
B)  31.1% 
C)  69.9% 
D)  59.9% 
A)  41.0% 
B)  31.1% 
C)  69.9% 
D)  59.9%

Question 2

The conservation of mass law states that matter can neither be created nor destroyed during a chemical reaction.

Accepted Answer

A) True 
 B)False

Question 3

Write the atomic symbols for the following neutral isotopes.
-uranium-235

Accepted Answer

atomic num

Question 4

Magnesium is the element that appears in the second group of the second period.

Accepted Answer

A) True 
 B)False

Question 5

Write the atomic symbols for the following neutral isotopes.
-lead-207

Accepted Answer

atomic num

Question 6

Which of the following is a transition metal in the fourth period of the periodic table?

Accepted Answer

A)  Ga 
B)  Ca 
C)  Fe 
D)  Ag 
A)  Ga 
B)  Ca 
C)  Fe 
D)  Ag

Question 7

Which of the following has the lowest ionization energy?

Accepted Answer

A)  F 
B)  P 
C)  Ca 
D)  Cs 
A)  F 
B)  P 
C)  Ca 
D)  Cs

Question 8

Radium is the only noble gas that is radioactive.

Accepted Answer

A) True 
 B)False

Question 9

Write the atomic symbols for the following neutral isotopes.
-strontium-90

Accepted Answer

atomic num

Question 10

The most stable isotope of oxygen has 8 neutrons.

Accepted Answer

A) True 
 B)False

Question 11

It is easier to remove an electron from the outside shell of a K atom than from the outside shell of a Na atom.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following terms applies to the horizontal rows found on a periodic table?

Accepted Answer

A)  arrangement 
B)  group 
C)  period 
D)  isotope 
A)  arrangement 
B)  group 
C)  period 
D)  isotope

Question 13

How many protons are found in a N3- ion?

Accepted Answer

A)  7 
B)  10 
C)  14 
D)  15 
A)  7 
B)  10 
C)  14 
D)  15

Question 14

Platinum is used in the catalytic converters of the cars.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following elements may have a cation that has 16 electrons?

Accepted Answer

A)  Si 
B)  P 
C)  S 
D)  Cl 
A)  Si 
B)  P 
C)  S 
D)  Cl

Question 16

Which element, isotope, or ion listed below contains 16 protons, 17 neutrons, and 18 electrons?

Accepted Answer

A)  "33Ar2-" 
B)  "33S2-" 
C)  "33Cl" 
D)  "34S2-" 
A)  "33Ar2-" 
B)  "33S2-" 
C)  "33Cl" 
D)  "34S2-"

Question 17

In Dalton's atomic theory, all matter is made up of atoms.

Accepted Answer

A) True 
 B)False

Question 18

Krypton is a noble gas.

Accepted Answer

A) True 
 B)False

Question 19

According to the experiments of Ernest Rutherford, where can a majority of a given atom's mass be found?

Accepted Answer

A)  scattered randomly throughout an approximately cube-shaped atom 
B)  at the center of an approximately spherical atom 
C)  in concentric layers of spherical shape 
D)  as small pieces orbiting a common center in circular paths 
A)  scattered randomly throughout an approximately cube-shaped atom 
B)  at the center of an approximately spherical atom 
C)  in concentric layers of spherical shape 
D)  as small pieces orbiting a common center in circular paths

Question 20

Which element, isotope, or ion listed below contains 35 protons, 46 neutrons, and 36 electrons?

Accepted Answer

A)  "81Kr+" 
B)  "81Br" 
C)  "81Kr" 
D)  "81Br -" 
A)  "81Kr+" 
B)  "81Br" 
C)  "81Kr" 
D)  "81Br -"

A 3.45 gram sample of hematite (Fe₂O₃) that contains 2.41 grams of Fe has what percentage Fe by mass?

The conservation of mass law states that matter can neither be created nor destroyed during a chemical reaction.

Write the atomic symbols for the following neutral isotopes. -uranium-235

Magnesium is the element that appears in the second group of the second period.

Write the atomic symbols for the following neutral isotopes. -lead-207

Which of the following is a transition metal in the fourth period of the periodic table?

Which of the following has the lowest ionization energy?

Radium is the only noble gas that is radioactive.

Write the atomic symbols for the following neutral isotopes. -strontium-90

The most stable isotope of oxygen has 8 neutrons.

It is easier to remove an electron from the outside shell of a K atom than from the outside shell of a Na atom.

Which of the following terms applies to the horizontal rows found on a periodic table?

How many protons are found in a N₃- ion?

Platinum is used in the catalytic converters of the cars.

Which of the following elements may have a cation that has 16 electrons?

Which element, isotope, or ion listed below contains 16 protons, 17 neutrons, and 18 electrons?

In Dalton's atomic theory, all matter is made up of atoms.

Krypton is a noble gas.

According to the experiments of Ernest Rutherford, where can a majority of a given atom's mass be found?

Which element, isotope, or ion listed below contains 35 protons, 46 neutrons, and 36 electrons?

What Is Chemistry

The Numerical Side of Chemistry

The Modern Model of the Atom

Chemical Bonding and Nomenclature

The Shape of Molecules

Intermolecular Forces and the Phases of Matter

Chemical Reactions

Stoichiometry and the Mole

Electron Transfer in Chemical Reactions

What If There Were No Intermolecular Forces - the Ideal Gas

Solutions

When Reactants Turn Into Products

Chemical Equilibrium

Electrolytes, Acids, and Bases

Nuclear Chemistry

The Chemistry of Carbon

Synthetic and Biological Polymers

Filters

Exam 3: The Evolution of Atomic Theory

A 3.45 gram sample of hematite (Fe2O₃) that contains 2.41 grams of Fe has what percentage Fe by mass?

The conservation of mass law states that matter can neither be created nor destroyed during a chemical reaction.

Write the atomic symbols for the following neutral isotopes. -uranium-235

Magnesium is the element that appears in the second group of the second period.

Write the atomic symbols for the following neutral isotopes. -lead-207

Which of the following is a transition metal in the fourth period of the periodic table?

Which of the following has the lowest ionization energy?

Radium is the only noble gas that is radioactive.

Write the atomic symbols for the following neutral isotopes. -strontium-90

The most stable isotope of oxygen has 8 neutrons.

It is easier to remove an electron from the outside shell of a K atom than from the outside shell of a Na atom.

Which of the following terms applies to the horizontal rows found on a periodic table?

How many protons are found in a N3- ion?

Platinum is used in the catalytic converters of the cars.

Which of the following elements may have a cation that has 16 electrons?

Which element, isotope, or ion listed below contains 16 protons, 17 neutrons, and 18 electrons?

In Dalton's atomic theory, all matter is made up of atoms.

Krypton is a noble gas.

According to the experiments of Ernest Rutherford, where can a majority of a given atom's mass be found?

Which element, isotope, or ion listed below contains 35 protons, 46 neutrons, and 36 electrons?

What Is Chemistry

The Numerical Side of Chemistry

The Modern Model of the Atom

Chemical Bonding and Nomenclature

The Shape of Molecules

Intermolecular Forces and the Phases of Matter

Chemical Reactions

Stoichiometry and the Mole

Electron Transfer in Chemical Reactions

What If There Were No Intermolecular Forces - the Ideal Gas

Solutions

When Reactants Turn Into Products

Chemical Equilibrium

Electrolytes, Acids, and Bases

Nuclear Chemistry

The Chemistry of Carbon

Synthetic and Biological Polymers

Filters

A 3.45 gram sample of hematite (Fe₂O₃) that contains 2.41 grams of Fe has what percentage Fe by mass?

How many protons are found in a N₃- ion?