Question 1

Which of the following is NOT true regarding cations and anions?

Accepted Answer

A) N3- represents a nitrogen atom that has gained three electrons. 
B) An oxygen molecule can lose an electron to form O2-. 
C) Ca2 -represents a calcium atom that has lost two electrons. 
D) The formation of a chlorine anion can be written as Cl+ e-$\rightarrow$Cl-. 
E) N2 $\rightarrow$ N2 +e -  describes a nitrogen molecule forming a +1 cation. 
A) N3- represents a nitrogen atom that has gained three electrons. 
B) An oxygen molecule can lose an electron to form O2-. 
C) Ca2 -represents a calcium atom that has lost two electrons. 
D) The formation of a chlorine anion can be written as Cl+ e-$\rightarrow$Cl-. 
E) N2 $\rightarrow$ N2 +e -  describes a nitrogen molecule forming a +1 cation.

Question 2

Two inorganic blue pigments are Han blue (BaCuSi4O10) and Egyptian blue (CaCuSi4O10). Which has a higher molar mass and by how much?

Accepted Answer

A) Egyptian blue by 137.3 g/mol 
B) Egyptian blue by 40.08 g/mol 
C) Han blue by 97.22 g/mol 
D) Han blue by 137.3 g/mol 
E) Han blue by 177.4 g/mol 
A) Egyptian blue by 137.3 g/mol 
B) Egyptian blue by 40.08 g/mol 
C) Han blue by 97.22 g/mol 
D) Han blue by 137.3 g/mol 
E) Han blue by 177.4 g/mol

Question 3

Give an example of a metalloid also known as a semimetal).

Accepted Answer

boron, silicon, germ

Question 4

Elements in group 18 (VIIIA) are called _______.

Accepted Answer

A) alkali metals. 
B) noble gases. 
C) alkaline earth metals. 
D) halogens. 
E) chalcogens. 
A) alkali metals. 
B) noble gases. 
C) alkaline earth metals. 
D) halogens. 
E) chalcogens.

Question 5

What is the formula unit mass of ammonium carbonate (NH4)2CO3?

Accepted Answer

A) 78.04 amu 
B) 82.02 amu 
C) 96.09 amu 
D) 102.07 amu 
E) 212.88 amu 
A) 78.04 amu 
B) 82.02 amu 
C) 96.09 amu 
D) 102.07 amu 
E) 212.88 amu

Question 6

Give an example of an alkali metal.

Accepted Answer

lithium, sodium, pot

Question 7

Identify the element based on the following values for its five isotopes: 179.947 amu (0.12%), 181.948 amu (26.50%), 182.950 amu (14.31%), 183.951 amu (30.64%), and 185.954 amu (28.43%).

Accepted Answer

A) Ir 
B) Os 
C) Re 
D) Ta 
E) W 
A) Ir 
B) Os 
C) Re 
D) Ta 
E) W

Question 8

TNT, or trinitrotoluene, has the chemical formula C7H5N3O6 (227.13 g/mol).Which of the following amounts of TNT contains the most nitrogen?

Accepted Answer

A) 1.22 * 1024 molecules 
B) 278 g 
C) 1.33 mol 
D) the number of moles of TNT containing 9 moles of O 
E) the number of moles of TNT containing 8 moles of C 
A) 1.22 * 1024 molecules 
B) 278 g 
C) 1.33 mol 
D) the number of moles of TNT containing 9 moles of O 
E) the number of moles of TNT containing 8 moles of C

Question 9

What is the molecular mass of sulfuric acid (H2SO4)?

Accepted Answer

A) 24.5 amu 
B) 49.0 amu 
C) 97.0 amu 
D) 98.1 amu 
E) 101 amu 
A) 24.5 amu 
B) 49.0 amu 
C) 97.0 amu 
D) 98.1 amu 
E) 101 amu

Question 10

Write the complete atomic symbol with both a superscript and a subscript for the atom or ion that contains the same number of protons as the number of neutrons in 56Fe, has a +2 charge, and has a mass number that equals the atomic number of terbium, Tb.

Accepted Answer

The answer of Write the complete atomic symbol with both...

Question 11

The diameter of a carbon atom is approximately 140 pm, whereas the diameter of a pencil lead is approximately 0.7 mm.How many carbon nuclei would be required to span 0.7 mm? The radius of the nucleus is approximately 10,000 times smaller than the radius of an atom.

Accepted Answer

A) 5 * 109 nuclei 
B) 5 * 1010 nuclei 
C) 5 * 1012 nuclei 
D) 5 *1013 nuclei 
E) 5 *1015 nuclei 
A) 5 * 109 nuclei 
B) 5 * 1010 nuclei 
C) 5 * 1012 nuclei 
D) 5 *1013 nuclei 
E) 5 *1015 nuclei

Question 12

A phosphorus-31 atom has _______ protons, _______ neutrons, and _______ electrons.

Accepted Answer

A) 31; 31; 31 
B) 15; 16; 16 
C) 15; 31; 15 
D) 15; 16; 15 
E) 16; 15; 15 
A) 31; 31; 31 
B) 15; 16; 16 
C) 15; 31; 15 
D) 15; 16; 15 
E) 16; 15; 15

Question 13

Which element forms an ionic compound with oxygen that has the formula XO?

Accepted Answer

A) germanium 
B) aluminum 
C) lithium 
D) calcium 
E) potassium 
A) germanium 
B) aluminum 
C) lithium 
D) calcium 
E) potassium

Question 14

If the diameter of a carbon atom is approximately 140 pm, how many carbon atoms lined up side to side would span a pencil lead with a diameter of about 0.7 mm?

Accepted Answer

A) 5 *101 atoms 
B) 5* 103 atoms 
C) 5 * 105 atoms 
D) 5*106 atoms 
E) 5 * 109 atoms 
A) 5 *101 atoms 
B) 5* 103 atoms 
C) 5 * 105 atoms 
D) 5*106 atoms 
E) 5 * 109 atoms

Question 15

What is the correct formula for the compound formed between sodium and selenium based on their positions in the periodic table?

Accepted Answer

A) Na2Se 
B) NaSe2 
C) NaSe 
D) Na2Se2 
E) Na3Se 
A) Na2Se 
B) NaSe2 
C) NaSe 
D) Na2Se2 
E) Na3Se

Question 16

Calculate the number of americium-241 atoms present in a smoke alarm containing 0.60 $\mu$g of radioactive 241Am (241.06 g/mol).

Accepted Answer

A) 1.5 * 1015 atoms 
B) 2.4 * 10-16 atoms 
C) 8.7 * 1019 atoms 
D) 1.5*1027 atoms 
E) 2.5 *103 atoms 
A) 1.5 * 1015 atoms 
B) 2.4 * 10-16 atoms 
C) 8.7 * 1019 atoms 
D) 1.5*1027 atoms 
E) 2.5 *103 atoms

Question 17

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

Accepted Answer

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

Question 18

How many oxygen atoms are in a formula unit of aluminum oxide?

Accepted Answer

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

Question 19

Which contains the most bromine by mass?

Accepted Answer

A) Br2O 
B) CsBr 
C) CBr4 
D) Br2O8 
E) PtBr2 
A) Br2O 
B) CsBr 
C) CBr4 
D) Br2O8 
E) PtBr2

Question 20

What is the mass (in amu) of one molecule of cholesterol, C27H46O?

Accepted Answer

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

Which of the following is NOT true regarding cations and anions?

Two inorganic blue pigments are Han blue (BaCuSi4O10) and Egyptian blue (CaCuSi4O10). Which has a higher molar mass and by how much?

Give an example of a metalloid also known as a semimetal).

Elements in group 18 (VIIIA) are called _______.

What is the formula unit mass of ammonium carbonate (NH4)2CO3?

Give an example of an alkali metal.

Identify the element based on the following values for its five isotopes: 179.947 amu (0.12%), 181.948 amu (26.50%), 182.950 amu (14.31%), 183.951 amu (30.64%), and 185.954 amu (28.43%).

TNT, or trinitrotoluene, has the chemical formula C7H5N3O6 (227.13 g/mol).Which of the following amounts of TNT contains the most nitrogen?

What is the molecular mass of sulfuric acid (H2SO4)?

Write the complete atomic symbol with both a superscript and a subscript for the atom or ion that contains the same number of protons as the number of neutrons in 56Fe, has a +2 charge, and has a mass number that equals the atomic number of terbium, Tb.

The diameter of a carbon atom is approximately 140 pm, whereas the diameter of a pencil lead is approximately 0.7 mm.How many carbon nuclei would be required to span 0.7 mm? The radius of the nucleus is approximately 10,000 times smaller than the radius of an atom.

A phosphorus-31 atom has _______ protons, _______ neutrons, and _______ electrons.

Which element forms an ionic compound with oxygen that has the formula XO?

If the diameter of a carbon atom is approximately 140 pm, how many carbon atoms lined up side to side would span a pencil lead with a diameter of about 0.7 mm?

What is the correct formula for the compound formed between sodium and selenium based on their positions in the periodic table?

Calculate the number of americium-241 atoms present in a smoke alarm containing 0.60 μ\muμ g of radioactive 241Am (241.06 g/mol).

What is the correct symbol for a α\alphaα particle?

How many oxygen atoms are in a formula unit of aluminum oxide?

Which contains the most bromine by mass?

What is the mass (in amu) of one molecule of cholesterol, C27H46O?

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

Two inorganic blue pigments are Han blue (BaCuSi₄O₁₀) and Egyptian blue (CaCuSi₄O₁₀)_. Which has a higher molar mass and by how much?

What is the formula unit mass of ammonium carbonate (NH₄)₂CO₃?

TNT, or trinitrotoluene, has the chemical formula C₇H₅N₃O₆ (227.13 g/mol).Which of the following amounts of TNT contains the most nitrogen?

What is the molecular mass of sulfuric acid (H₂SO₄)?

Write the complete atomic symbol with both a superscript and a subscript for the atom or ion that contains the same number of protons as the number of neutrons in ⁵⁶Fe, has a +2 charge, and has a mass number that equals the atomic number of terbium, Tb.

A phosphorus-31 atom has ___ protons, _ neutrons, and _____ electrons.

Calculate the number of americium-241 atoms present in a smoke alarm containing 0.60 $\mu$ g of radioactive ²⁴¹Am (241.06 g/mol).

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

What is the mass (in amu) of one molecule of cholesterol, C₂₇H₄₆O?