Question 1

Combustion analysis is one way to determine the simplest formula of some compounds.

Accepted Answer

A) True 
 B)False  True

Question 2

Nitrogen forms at least three stable oxides: N2O, NO, and NO2. How many grams of nitrogen reacts with 32 grams of oxygen to form NO?

Accepted Answer

A)  16 grams 
B)  28 grams 
C)  14 grams 
D)  32 grams 
E)  8 grams 
A)  16 grams 
B)  28 grams 
C)  14 grams 
D)  32 grams 
E)  8 grams B

Question 3

A 2.000 g sample of water contains 11.19% H by mass and 88.81% O by mass. What mass of H will be found in a 27.000 g sample of water?

Accepted Answer

A)  3.021 g 
B)  1.511 g 
C)  2.413 g 
D)  1.206 g 
E)  23.98 g 
A)  3.021 g 
B)  1.511 g 
C)  2.413 g 
D)  1.206 g 
E)  23.98 g A

Question 4

To produce ferrocene one requires 2.33 g of C5H5 (65.0 g/mol) for every 1.00 g of Fe used (55.9 g/mol). What is the value of x in the formula of ferrocene: Fe · x C5H5?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 5

Hydrocarbons contain only carbon and hydrogen.

Accepted Answer

A) True 
 B)False

Question 6

How many grams of O are found in 1.00 × 102 g of K2Cr2O7?

Accepted Answer

A)  14.9 g 
B)  38.1 g 
C)  5.44 g 
D)  11.3 g 
E)  78.8 g 
A)  14.9 g 
B)  38.1 g 
C)  5.44 g 
D)  11.3 g 
E)  78.8 g

Question 7

How many hydrogen atoms are present in 2.84 moles of water?

Accepted Answer

A)  3.42 × 1024 H atoms 
B)  1.71 × 1024 H atoms 
C)  4.24 × 1023 H atoms 
D)  9.44 × 1024 H atoms 
E)  3.42 × 1023 H atoms 
A)  3.42 × 1024 H atoms 
B)  1.71 × 1024 H atoms 
C)  4.24 × 1023 H atoms 
D)  9.44 × 1024 H atoms 
E)  3.42 × 1023 H atoms

Question 8

The magnesium in a sample of mineral water weighing 110.520 g is first converted to MgNH4PO4 and then to Mg2P2O7. The mass of Mg2P2O7 obtained is 0.0216 g. Express the quantity of magnesium in the mineral water in parts per million (that is in g Mg per 106 g H2O).

Accepted Answer

A)  1.95 × 103 ppm 
B)  8.95 ppm 
C)  234 ppm 
D)  42.7 ppm 
E)  21.4 ppm 
A)  1.95 × 103 ppm 
B)  8.95 ppm 
C)  234 ppm 
D)  42.7 ppm 
E)  21.4 ppm

Question 9

What is the correct name for the following organic structure? CH3C(CH3)2CH3

Accepted Answer

A)  pentane 
B)  2,2-dimethylpropane 
C)  2-methylbutane 
D)  1,3-dimethylpropane 
E)  2-ethylpropane 
A)  pentane 
B)  2,2-dimethylpropane 
C)  2-methylbutane 
D)  1,3-dimethylpropane 
E)  2-ethylpropane

Question 10

The formula of barium nitride is ________.

Accepted Answer

A)  Ba3N2 
B)  Ba2N2 
C)  BaN 
D)  Ba2N 
A)  Ba3N2 
B)  Ba2N2 
C)  BaN 
D)  Ba2N

Question 11

The number of atoms in 10.0 g of CaCO3 (100.0 g/mol) is:

Accepted Answer

A)  18.1 × 1022 atoms 
B)  30.1 × 1022 atoms 
C)  6.02 × 1022 atoms 
D)  12.1 × 1023 atoms 
E)  12.1 × 1022 atoms 
A)  18.1 × 1022 atoms 
B)  30.1 × 1022 atoms 
C)  6.02 × 1022 atoms 
D)  12.1 × 1023 atoms 
E)  12.1 × 1022 atoms

Question 12

How many grams of Cr are found in 1.00 × 102 g of K2Cr2O7?

Accepted Answer

A)  35.4 g 
B)  24.3 g 
C)  12.2 g 
D)  48.6 g 
E)  33.8 g 
A)  35.4 g 
B)  24.3 g 
C)  12.2 g 
D)  48.6 g 
E)  33.8 g

Question 13

The name of which compound ends in -ite?

Accepted Answer

A)  HIO3 
B)  Na2SO3 
C)  H2SO3 
D)  Na2CO3 
E)  CaH2 
A)  HIO3 
B)  Na2SO3 
C)  H2SO3 
D)  Na2CO3 
E)  CaH2

Question 14

The correct chemical name for the compound SbCl3 is ________.

Accepted Answer

A)  tin trichloride 
B)  antimony trichloride 
C)  stannous trichloride 
D)  antimony chloride 
E)  antimony(III) chloride 
A)  tin trichloride 
B)  antimony trichloride 
C)  stannous trichloride 
D)  antimony chloride 
E)  antimony(III) chloride

Question 15

The molecular formula for caffeine is C8H10O2N4. How many moles of C atoms are present in a 2.0 g sample of caffeine?

Accepted Answer

A)  0.32 mole 
B)  0.27 mole 
C)  0.041 mole 
D)  0.082 mole 
E)  0.010 mole 
A)  0.32 mole 
B)  0.27 mole 
C)  0.041 mole 
D)  0.082 mole 
E)  0.010 mole

Question 16

Complete combustion of a 0.500 g sample of a pure hydrocarbon yielded 0.973 g CO2 and 0.319 g H2O. The empirical formula of this hydrocarbon is ________.

Accepted Answer

A)  C3H5 
B)  C2H3 
C)  C4H6 
D)  C5H8 
E)  C6H9 
A)  C3H5 
B)  C2H3 
C)  C4H6 
D)  C5H8 
E)  C6H9

Question 17

Choose the INCORRECT statement.

Accepted Answer

A)  A molecule is a group of bonded atoms that exist as an entity. 
B)  Ionic compounds result from combinations of metals and nonmetals. 
C)  An anion is a positive ion. 
D)  The empirical formula is the simplest formula of the ratio of atoms. 
E)  The molecular formula is the listing of the atoms in an actual molecule. 
A)  A molecule is a group of bonded atoms that exist as an entity. 
B)  Ionic compounds result from combinations of metals and nonmetals. 
C)  An anion is a positive ion. 
D)  The empirical formula is the simplest formula of the ratio of atoms. 
E)  The molecular formula is the listing of the atoms in an actual molecule.

Question 18

The correct chemical name for the substance Al(OH)3 is ________.

Accepted Answer

A)  aluminum hydroxide 
B)  aluminum trihydroxide 
C)  aluminum oxytrihydrate 
D)  aluminum(III) hydroxide 
E)  aluminum trihydrogenoxide 
A)  aluminum hydroxide 
B)  aluminum trihydroxide 
C)  aluminum oxytrihydrate 
D)  aluminum(III) hydroxide 
E)  aluminum trihydrogenoxide

Question 19

Fumaric acid, C4H4O4, can be extracted from plants and can be used as a substitute for citrus acid in fruit drinks. The percent composition by mass of fumaric acid is ________.

Accepted Answer

A)  C 33.33% H 33.33% O 33.33% 
B)  C 39.80% H 6.68% O 53.52% 
C)  C 40.00% H 6.67% O 53.33% 
D)  C 41.39% H 3.47% O 55.14% 
E)  C 0.25% H 0.25% O 0.50% 
A)  C 33.33% H 33.33% O 33.33% 
B)  C 39.80% H 6.68% O 53.52% 
C)  C 40.00% H 6.67% O 53.33% 
D)  C 41.39% H 3.47% O 55.14% 
E)  C 0.25% H 0.25% O 0.50%

Question 20

Polyatomic ions end in -ate or -ite.

Accepted Answer

A) True 
 B)False

Exam 3: Chemical Compounds

Combustion analysis is one way to determine the simplest formula of some compounds.

Nitrogen forms at least three stable oxides: N2O, NO, and NO2. How many grams of nitrogen reacts with 32 grams of oxygen to form NO?

A 2.000 g sample of water contains 11.19% H by mass and 88.81% O by mass. What mass of H will be found in a 27.000 g sample of water?

To produce ferrocene one requires 2.33 g of C5H5 (65.0 g/mol) for every 1.00 g of Fe used (55.9 g/mol). What is the value of x in the formula of ferrocene: Fe · x C5H5?

Hydrocarbons contain only carbon and hydrogen.

How many grams of O are found in 1.00 × 102 g of K2Cr2O7?

How many hydrogen atoms are present in 2.84 moles of water?

The magnesium in a sample of mineral water weighing 110.520 g is first converted to MgNH4PO4 and then to Mg2P2O7. The mass of Mg2P2O7 obtained is 0.0216 g. Express the quantity of magnesium in the mineral water in parts per million (that is in g Mg per 106 g H2O).

What is the correct name for the following organic structure? CH3C(CH3)2CH3

The formula of barium nitride is ________.

The number of atoms in 10.0 g of CaCO3 (100.0 g/mol) is:

How many grams of Cr are found in 1.00 × 102 g of K2Cr2O7?

The name of which compound ends in -ite?

The correct chemical name for the compound SbCl3 is ________.

The molecular formula for caffeine is C8H10O2N4. How many moles of C atoms are present in a 2.0 g sample of caffeine?

Complete combustion of a 0.500 g sample of a pure hydrocarbon yielded 0.973 g CO2 and 0.319 g H2O. The empirical formula of this hydrocarbon is ________.

Choose the INCORRECT statement.

The correct chemical name for the substance Al(OH)3 is ________.

Fumaric acid, C4H4O4, can be extracted from plants and can be used as a substitute for citrus acid in fruit drinks. The percent composition by mass of fumaric acid is ________.

Polyatomic ions end in -ate or -ite.

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

Nitrogen forms at least three stable oxides: N₂O, NO, and NO₂. How many grams of nitrogen reacts with 32 grams of oxygen to form NO?

How many grams of O are found in 1.00 × 10² g of K₂Cr₂O₇?

The magnesium in a sample of mineral water weighing 110.520 g is first converted to MgNH₄PO₄ and then to Mg₂P₂O₇. The mass of Mg₂P₂O₇ obtained is 0.0216 g. Express the quantity of magnesium in the mineral water in parts per million (that is in g Mg per 106 g H₂O).

What is the correct name for the following organic structure? CH₃C(CH₃)₂CH₃

The number of atoms in 10.0 g of CaCO₃ (100.0 g/mol) is:

How many grams of Cr are found in 1.00 × 10² g of K₂Cr₂O₇?

The correct chemical name for the compound SbCl₃ is ________.

The molecular formula for caffeine is C₈H₁₀O₂N₄. How many moles of C atoms are present in a 2.0 g sample of caffeine?

Complete combustion of a 0.500 g sample of a pure hydrocarbon yielded 0.973 g CO₂ and 0.319 g H₂O. The empirical formula of this hydrocarbon is ________.

The correct chemical name for the substance Al(OH)₃ is ________.

Fumaric acid, C₄H₄O₄, can be extracted from plants and can be used as a substitute for citrus acid in fruit drinks. The percent composition by mass of fumaric acid is ________.