Question 1

What is the correct symbol for a neutron?

Accepted Answer

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

Question 2

Which of the following compounds contains the most nitrogen atoms per formula?

Accepted Answer

A) N2H4 
B) NH4NO3 
C) NaN3 
D) (NH4)2SO4 
E) C8H12N4O3 
A) N2H4 
B) NH4NO3 
C) NaN3 
D) (NH4)2SO4 
E) C8H12N4O3

Question 3

Silicon brass contains 82.0% Cu, 14.0% Zn, and 4.00% Si by mass, and its density is 8.28 g/cm3.How many moles of silicon are present in 22.0 cm3 of silicon brass?

Accepted Answer

A) 6.48 mol Si 
B) 5.32 mol Si 
C) 0.908 mol Si 
D) 0.259 mol Si 
E) 0.0946 mol Si 
A) 6.48 mol Si 
B) 5.32 mol Si 
C) 0.908 mol Si 
D) 0.259 mol Si 
E) 0.0946 mol Si

Question 4

Cobalt is best described as a _______.

Accepted Answer

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

Question 5

Zinc oxide, a combination of zinc and oxygen, is found in many skin ointments.What formula best describes this compound?

Accepted Answer

A) ZnO 
B) Zn2O 
C) ZnO2 
D) Zn2O2 
E) Zn2O3 
A) ZnO 
B) Zn2O 
C) ZnO2 
D) Zn2O2 
E) Zn2O3

Question 6

What is the charge on the cobalt ion in CoCl3?

Accepted Answer

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

Question 7

TNT, or trinitrotoluene, has the chemical formula C7H5N3O6.How many grams of nitrogen are present in 25 g TNT (227.13 g/mol)?

Accepted Answer

A) 0.11 g 
B) 0.33 g 
C) 1.5 g 
D) 4.6 g 
E) 5.4 g 
A) 0.11 g 
B) 0.33 g 
C) 1.5 g 
D) 4.6 g 
E) 5.4 g

Question 8

If the nucleus of an atom has a radius of about 5 fm and a mass of about 2 *10-21 g, what is its approximate density? (The volume of a sphere = 4 $\pi$r3/3.)

Accepted Answer

A) 4 *1015 g/cm3 
B) 4 *1012 g/cm3 
C) 4 *109 g/cm3 
D) 4 * 106 g/cm3 
E) 4 * 103 g/cm3 
A) 4 *1015 g/cm3 
B) 4 *1012 g/cm3 
C) 4 *109 g/cm3 
D) 4 * 106 g/cm3 
E) 4 * 103 g/cm3

Question 9

What is the charge on the thallium ion in Tl2O3?

Accepted Answer

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

Question 10

Gallium has two naturally occurring isotopes with the following masses and natural abundances.Calculate the average atomic mass of Ga.

Accepted Answer

A) 69.925 amu 
B) 70.127 amu 
C) 70.000 amu 
D) 69.824 amu 
E) 69.723 amu 
A) 69.925 amu 
B) 70.127 amu 
C) 70.000 amu 
D) 69.824 amu 
E) 69.723 amu

Question 11

What is the correct symbol for a $\beta$ particle?

Accepted Answer

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

Question 12

Which of the following statements regarding the discovery of isotopes is FALSE?

Accepted Answer

A) Positively charged ions were deflected by a combination of electric and magnetic fields. 
B) Nuclides with equal charges but different masses were deflected to different degrees. 
C) The amount of deflection of an ion depended on its charge. 
D) An estimate of the relative abundance of the different isotopes of an element could be ascertained. 
E) If nuclides had the same mass but different positive charges, the ion with the smallest charge was deflected the most. 
A) Positively charged ions were deflected by a combination of electric and magnetic fields. 
B) Nuclides with equal charges but different masses were deflected to different degrees. 
C) The amount of deflection of an ion depended on its charge. 
D) An estimate of the relative abundance of the different isotopes of an element could be ascertained. 
E) If nuclides had the same mass but different positive charges, the ion with the smallest charge was deflected the most.

Question 13

How many bromine atoms are in a formula unit of calcium bromide?

Accepted Answer

The answer of How many bromine atoms are in a...

Question 14

What is the mass in (amu) of one molecule of glucose, C6H12O6?

Accepted Answer

Question 15

Calcium is an example of _______.

Accepted Answer

A) an alkali metal. 
B) a transition metal. 
C) an alkaline earth metal. 
D) a halogen. 
E) a chalcogen. 
A) an alkali metal. 
B) a transition metal. 
C) an alkaline earth metal. 
D) a halogen. 
E) a chalcogen.

Question 16

Identify the element based on the following values for its three isotopes: 38.9637 amu (93.08%), 39.9640 amu (0.012%), and 40.9618 amu (6.91%).

Accepted Answer

A) K 
B) Cl 
C) S 
D) Ar 
E) Ca 
A) K 
B) Cl 
C) S 
D) Ar 
E) Ca

Question 17

Which subatomic particles have approximately equal masses?

Accepted Answer

A) protons and neutrons 
B) protons and electrons 
C) neutrons and electrons 
D) protons, neutrons, and electrons 
E) none of the above 
A) protons and neutrons 
B) protons and electrons 
C) neutrons and electrons 
D) protons, neutrons, and electrons 
E) none of the above

Question 18

Nuclei with certain numbers of protons and neutrons (or combinations thereof) appear to be more stable than others."Magic numbers" that are consistent with known nuclides are 2, 8, 20, 28, 50, 82, and 126, with 180 and 306 being hypothesized as the next in the series.Using this information, along with your knowledge of atoms and isotopes, you try to synthesize a new atom (symbol X) based on stable combinations of nucleons.Which do you think is a likely candidate?

Accepted Answer

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

Question 19

Give an example of a nonmetal.

Accepted Answer

carbon, nitrogen, ox

Question 20

Calculate the formula unit mass of sodium phosphate (Na3PO4) in which all of the phosphorus is 32P, a radioactive isotope of phosphorus used in medical applications.A32P atom has an atomic mass of
31.97 amu.

Accepted Answer

164.94 g/mol
(322.99

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

What is the correct symbol for a neutron?

Which of the following compounds contains the most nitrogen atoms per formula?

Silicon brass contains 82.0% Cu, 14.0% Zn, and 4.00% Si by mass, and its density is 8.28 g/cm3.How many moles of silicon are present in 22.0 cm3 of silicon brass?

Cobalt is best described as a _______.

Zinc oxide, a combination of zinc and oxygen, is found in many skin ointments.What formula best describes this compound?

What is the charge on the cobalt ion in CoCl3?

TNT, or trinitrotoluene, has the chemical formula C7H5N3O6.How many grams of nitrogen are present in 25 g TNT (227.13 g/mol)?

If the nucleus of an atom has a radius of about 5 fm and a mass of about 2 *10-21 g, what is its approximate density? (The volume of a sphere = 4 π\piπ r3/3.)

What is the charge on the thallium ion in Tl2O3?

Gallium has two naturally occurring isotopes with the following masses and natural abundances.Calculate the average atomic mass of Ga.

What is the correct symbol for a β\betaβ particle?

Which of the following statements regarding the discovery of isotopes is FALSE?

How many bromine atoms are in a formula unit of calcium bromide?

What is the mass in (amu) of one molecule of glucose, C6H12O6?

Calcium is an example of _______.

Identify the element based on the following values for its three isotopes: 38.9637 amu (93.08%), 39.9640 amu (0.012%), and 40.9618 amu (6.91%).

Which subatomic particles have approximately equal masses?

Give an example of a nonmetal.

Calculate the formula unit mass of sodium phosphate (Na3PO4) in which all of the phosphorus is 32P, a radioactive isotope of phosphorus used in medical applications.A32P atom has an atomic mass of 31.97 amu.

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

Silicon brass contains 82.0% Cu, 14.0% Zn, and 4.00% Si by mass, and its density is 8.28 g/cm³.How many moles of silicon are present in 22.0 cm³ of silicon brass?

What is the charge on the cobalt ion in CoCl₃?

TNT, or trinitrotoluene, has the chemical formula C₇H₅N₃O₆.How many grams of nitrogen are present in 25 g TNT (227.13 g/mol)?

If the nucleus of an atom has a radius of about 5 fm and a mass of about 2 *10^-21 g, what is its approximate density? (The volume of a sphere = 4 $\pi$ r³/3.)

What is the charge on the thallium ion in Tl₂O₃?

What is the correct symbol for a $\beta$ particle?

What is the mass in (amu) of one molecule of glucose, C₆H₁₂O₆?

Calculate the formula unit mass of sodium phosphate (Na₃PO₄) in which all of the phosphorus is ³²P, a radioactive isotope of phosphorus used in medical applications.A³²P atom has an atomic mass of 31.97 amu.