Question 1

The sixth period of the periodic table contains _______ elements.

Accepted Answer

A) 18 
B) 32 
C) 24 
D) 16 
E) 8 
A) 18 
B) 32 
C) 24 
D) 16 
E) 8

Question 2

Active metals often react with oxygen in air to form a protective surface film that prevents further reaction.Which one of the following formulas for a metal-oxygen combination is NOT correct?

Accepted Answer

A) Al2O3 
B) Fe2O3 
C) Na2O 
D) MgO2 
E) MnO 
A) Al2O3 
B) Fe2O3 
C) Na2O 
D) MgO2 
E) MnO

Question 3

How many grams of water (18.02 g/mol) would contain 6.54 * 1024 hydrogen atoms?

Accepted Answer

A) 10.9 g 
B) 5.43 g 
C) 0.301 g 
D) 97.9 g 
E) 3.27* 1024 g 
A) 10.9 g 
B) 5.43 g 
C) 0.301 g 
D) 97.9 g 
E) 3.27* 1024 g

Question 4

Weapons-grade plutonium consists of 93% Pu-239 239.0522 amu), with the remainder being Pu-40 (240.0538 amu).What is the average atomic mass of this sample of weapons-grade plutonium? Assume the percentages are exact.

Accepted Answer

A) 239.5530 amu 
B) 239.1223 amu 
C) 239.0522 amu 
D) 239.9478 amu 
E) 239.9822 amu 
A) 239.5530 amu 
B) 239.1223 amu 
C) 239.0522 amu 
D) 239.9478 amu 
E) 239.9822 amu

Question 5

You create a superheavy atom with an atomic number of 120.What is probably true about that element?

Accepted Answer

A) It is probably a gas. 
B) It is probably a metalloid. 
C) It is probably nonmetallic. 
D) It is probably metallic. 
E) It probably forms a stable +1 cation. 
A) It is probably a gas. 
B) It is probably a metalloid. 
C) It is probably nonmetallic. 
D) It is probably metallic. 
E) It probably forms a stable +1 cation.

Question 6

Uranium ores sometimes contain pockets of trapped helium.What is the origin of the helium?

Accepted Answer

The answer of Uranium ores sometimes contain pockets of trapped...

Question 7

For each of the elements below, there are only two naturally occurring isotopes.Using the atomic masses on the periodic table, identify the pair in which the heavier isotope is the more abundant one.

Accepted Answer

A) 63Cu and 65Cu 
B) 85Rb and 87Rb 
C) 10B and 11B 
D) 79Br and 81Br 
E) 14N and 15N 
A) 63Cu and 65Cu 
B) 85Rb and 87Rb 
C) 10B and 11B 
D) 79Br and 81Br 
E) 14N and 15N

Question 8

In early 2016, platinum (195.078 g/mol) was selling for about $1062 per troy ounce (one troy ounce is equal to 31.10 g).How many platinum atoms could you buy for $20?

Accepted Answer

A) 1.808* 1021 atoms 
B) 1.869 *1018 atoms 
C) 2.006* 1026 atoms 
D) 2.039 * 1027 atoms 
E) 5.098 * 1024 atoms 
A) 1.808* 1021 atoms 
B) 1.869 *1018 atoms 
C) 2.006* 1026 atoms 
D) 2.039 * 1027 atoms 
E) 5.098 * 1024 atoms

Question 9

What is the charge on the carbon atom when it forms an ionic compound with sodium?

Accepted Answer

The answer of What is the charge on the carbon...

Question 10

What is the mass in (kilograms) of 5.92*1026 water molecules?

Accepted Answer

The answer of What is the mass in (kilograms) of...

Question 11

What is the correct symbol for a proton?

Accepted Answer

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

Question 12

An anion has a _______ charge because it has _______ electrons.

Accepted Answer

The answer of An anion has a _______ charge because...

Question 13

The average atomic mass of silver is 107.868 amu.Silver has two naturally occurring isotopes, 107Ag (106.905 amu, 51.839%) and 109Ag.What is the isotopic mass of 109Ag?

Accepted Answer

A) 109.11 amu 
B) 109.00 amu 
C) 108.52 amu 
D) 108.91 amu 
E) 108.48 amu 
A) 109.11 amu 
B) 109.00 amu 
C) 108.52 amu 
D) 108.91 amu 
E) 108.48 amu

Question 14

Oxygen is best described as a _______.

Accepted Answer

A) metalloid. 
B) metal. 
C) transition metal. 
D) noble gas. 
E) nonmetal. 
A) metalloid. 
B) metal. 
C) transition metal. 
D) noble gas. 
E) nonmetal.

Question 15

Cyanidin chloride (C15H11O6Cl, 322.7 (g/mol) contains the cyanidin ion, a pigment found in many berries.Calculate the number of moles of cyanidin chloride equivalent to 7.2 mg.

Accepted Answer

A) 2.2 * 101 mol 
B) 3.2 * 10-2 mol 
C) 2.2 * 10-2 mol 
D) 2.2 *10-5 mol 
E) 7.2 *10-5 mol 
A) 2.2 * 101 mol 
B) 3.2 * 10-2 mol 
C) 2.2 * 10-2 mol 
D) 2.2 *10-5 mol 
E) 7.2 *10-5 mol

Question 16

Who was the first scientist to determine the charge of an electron?

Accepted Answer

A) Henri Becquerel 
B) Robert Millikan 
C) Joseph John Thomson 
D) John Dalton 
E) James Chadwick 
A) Henri Becquerel 
B) Robert Millikan 
C) Joseph John Thomson 
D) John Dalton 
E) James Chadwick

Question 17

Copper, which has an average atomic mass of 63.546 amu, has two stable isotopes: copper-63 and copper-65.Copper-63 has an atomic mass of 62.9296 amu and a natural abundance of 69.15%.What is the atomic mass of copper-65?

Accepted Answer

(0.6915) (62.9206) F

Question 18

What is the average atomic mass of an element (X) that contains 78.99% X-24 (23.985 amu), 10.00% X-25 (24.986 amu), and 11.01% X-26 25.9826 amu)? What is the identity of the element?

Accepted Answer

(0.7899)(23.985) F1F1F1S1?F1F1

Question 19

What ion would you predict element 118 would form?

Accepted Answer

A) (+2) 
B) (+1) 
C) (-1) 
D) (-2) 
E) 0 (unlikely to form an ion) 
A) (+2) 
B) (+1) 
C) (-1) 
D) (-2) 
E) 0 (unlikely to form an ion)

Question 20

Suppose you were given one gold atom every second since the big bang occurred about 14 billion years ago (1.4 * 1010 years).How many moles of gold atoms would you have?

Accepted Answer

A) 4.4 *1017 moles 
B) 4.4 * 10-17 moles 
C) 1.4 *10-8 moles 
D) 2.3*10-7 moles 
E) 7.3 * 10-7 moles 
A) 4.4 *1017 moles 
B) 4.4 * 10-17 moles 
C) 1.4 *10-8 moles 
D) 2.3*10-7 moles 
E) 7.3 * 10-7 moles

Exam 2: Atoms, Ions, and Molecules the Building Blocks of Matter

The sixth period of the periodic table contains _______ elements.

Active metals often react with oxygen in air to form a protective surface film that prevents further reaction.Which one of the following formulas for a metal-oxygen combination is NOT correct?

How many grams of water (18.02 g/mol) would contain 6.54 * 1024 hydrogen atoms?

Weapons-grade plutonium consists of 93% Pu-239 239.0522 amu), with the remainder being Pu-40 (240.0538 amu).What is the average atomic mass of this sample of weapons-grade plutonium? Assume the percentages are exact.

You create a superheavy atom with an atomic number of 120.What is probably true about that element?

Uranium ores sometimes contain pockets of trapped helium.What is the origin of the helium?

For each of the elements below, there are only two naturally occurring isotopes.Using the atomic masses on the periodic table, identify the pair in which the heavier isotope is the more abundant one.

In early 2016, platinum (195.078 g/mol) was selling for about $1062 per troy ounce (one troy ounce is equal to 31.10 g).How many platinum atoms could you buy for $20?

What is the charge on the carbon atom when it forms an ionic compound with sodium?

What is the mass in (kilograms) of 5.92*1026 water molecules?

What is the correct symbol for a proton?

An anion has a _______ charge because it has _______ electrons.

The average atomic mass of silver is 107.868 amu.Silver has two naturally occurring isotopes, 107Ag (106.905 amu, 51.839%) and 109Ag.What is the isotopic mass of 109Ag?

Oxygen is best described as a _______.

Cyanidin chloride (C15H11O6Cl, 322.7 (g/mol) contains the cyanidin ion, a pigment found in many berries.Calculate the number of moles of cyanidin chloride equivalent to 7.2 mg.

Who was the first scientist to determine the charge of an electron?

Copper, which has an average atomic mass of 63.546 amu, has two stable isotopes: copper-63 and copper-65.Copper-63 has an atomic mass of 62.9296 amu and a natural abundance of 69.15%.What is the atomic mass of copper-65?

What is the average atomic mass of an element (X) that contains 78.99% X-24 (23.985 amu), 10.00% X-25 (24.986 amu), and 11.01% X-26 25.9826 amu)? What is the identity of the element?

What ion would you predict element 118 would form?

Suppose you were given one gold atom every second since the big bang occurred about 14 billion years ago (1.4 * 1010 years).How many moles of gold atoms would you have?

Matter and Energy an Atomic Perspective

Atomic Structure Explaining the Properties of Elements

Chemical Bonding Understanding Climate Change

Bonding Theories Explaining Molecular Geometry

Intermolecular Forces Attractions Between Particles

Stoichiometry Mass Relationships and Chemical Reactions

Aqueous Solutions Chemistry of the Hydrosphere

Thermochemistry Energy Changes in Chemical Reactions

Properties of Gases the Air We Breathe

Properties of Solutions Their Concentrations and Colligative Properties

Thermodynamics Why Chemical Reactions Happen

Chemical Kinetics Clearing the Air

Chemical Equilibrium Equal but Opposite Reaction Rates

Acid-Base Equilibria Proton Transfer in Biological Systems

Additional Aqueous Equilibria Chemistry and the Oceans

Electrochemistry the Quest for Clean Energy

The Solid State a Particulate View

Organic Chemistry Fuels, Pharmaceuticals, and Modern Materials

Biochemistry the Compounds of Life

Nuclear Chemistry the Risks and Benefits

The Main Group Elements Life and the Periodic Table

Transition Metals Biological and Medical Applications

Filters

How many grams of water (18.02 g/mol) would contain 6.54 * 10²⁴ hydrogen atoms?

What is the mass in (kilograms) of 5.92*10²⁶ water molecules?

An anion has a _ charge because it has _ electrons.

The average atomic mass of silver is 107.868 amu.Silver has two naturally occurring isotopes, ¹⁰⁷Ag (106.905 amu, 51.839%) and ¹⁰⁹Ag.What is the isotopic mass of ¹⁰⁹Ag?

Cyanidin chloride (C₁₅H₁₁O₆Cl, 322.7 (g/mol) contains the cyanidin ion, a pigment found in many berries.Calculate the number of moles of cyanidin chloride equivalent to 7.2 mg.

Suppose you were given one gold atom every second since the big bang occurred about 14 billion years ago (1.4 * 10¹⁰years).How many moles of gold atoms would you have?