Question 1

Which contains the highest percentage of oxygen?

Accepted Answer

A)  H₂O₂ 
B)  Na₂O₂ 
C)  HgO 
D)  CO₂ 
A)  H₂O₂ 
B)  Na₂O₂ 
C)  HgO 
D)  CO₂

Question 2

One mole of hydrogen gas has 6.02 x 1023 atoms

Accepted Answer

A) True 
 B)False

Question 3

Alkynes have the general molecular formula CnH₂n-2. Thus, when n = 2, the alkyne is C₂H₂ etc. If an alkyne has a molecular mass between 75 and 85, this alkyne is ________.

Accepted Answer

A)  C₆H₁₀ 
B)  C₆H₁₂ 
C)  C₅H16 
D)  C7H₁₂ 
A)  C₆H₁₀ 
B)  C₆H₁₂ 
C)  C₅H16 
D)  C7H₁₂

Question 4

Which statement is true about the molecular formula?

Accepted Answer

A)  The molecular formula is always different than the empirical formula. 
B)  The molecular formula is always the same as the empirical formula. 
C)  The empirical formula may be different than the molecular formula. 
D)  The empirical formula can be determined solely by the % composition. 
A)  The molecular formula is always different than the empirical formula. 
B)  The molecular formula is always the same as the empirical formula. 
C)  The empirical formula may be different than the molecular formula. 
D)  The empirical formula can be determined solely by the % composition.

Question 5

Match each compound with its corresponding percent of nitrogen.
-(NH?)2CO?

Accepted Answer

A) 29.2% 
B) 63.6% 
C) 7.7% 
D) 30.4% 
A) 29.2% 
B) 63.6% 
C) 7.7% 
D) 30.4%

Question 6

Which of the following compounds is expected to have oxygen?

Accepted Answer

A)  compound W: %C= 40.2% ; H= 6.8%; N= 10.3%; S= 19.2% 
B)  compound X: %C= 52.3% ; H= 4.1%; Br= 30.4%; S= 13.2% 
C)  compound Y: %C= 25.6% ; H= 8.8%; I= 45.3%; N= 20.2% 
D)  compound Z: %C= 48.1% ; H= 8.6%; F= 28.2%; P= 15.0% 
A)  compound W: %C= 40.2% ; H= 6.8%; N= 10.3%; S= 19.2% 
B)  compound X: %C= 52.3% ; H= 4.1%; Br= 30.4%; S= 13.2% 
C)  compound Y: %C= 25.6% ; H= 8.8%; I= 45.3%; N= 20.2% 
D)  compound Z: %C= 48.1% ; H= 8.6%; F= 28.2%; P= 15.0%

Question 7

Which of the following abides by the principle of mass conservation according to the balanced reaction? 4 K + O₂ → 2 K₂O

Accepted Answer

A)  39.0g K + 16.0g O₂ → 94.0g K₂O 
B)  156.0 g K + 24.0g O₂ → 188.0g K₂O 
C)  156.0g K + 32.0g O₂ → 188.0g K₂O 
D)  78.0g K + 32.0g O₂ → 110.0g K₂O 
A)  39.0g K + 16.0g O₂ → 94.0g K₂O 
B)  156.0 g K + 24.0g O₂ → 188.0g K₂O 
C)  156.0g K + 32.0g O₂ → 188.0g K₂O 
D)  78.0g K + 32.0g O₂ → 110.0g K₂O

Question 8

The theoretical number of moles of nitrogen produced from 6 moles of NaN3 is ________. NaN3 → Na + N₂

Accepted Answer

A)  2 
B)  6 
C)  9 
D)  18 
A)  2 
B)  6 
C)  9 
D)  18

Question 9

The percent of nitrogen in ferric nitrate is 17.4%.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following will not have the same number atoms as the other three choices?

Accepted Answer

A)  K₂Cr₂O7 
B)  (NH₄)2S 
C)  Al(ClO₂)3 
D)  Ba(HCO₃)2 
A)  K₂Cr₂O7 
B)  (NH₄)2S 
C)  Al(ClO₂)3 
D)  Ba(HCO₃)2

Question 11

Match each compound with its corresponding number of atoms per formula unit.
-Al (C?H?O?)3

Accepted Answer

A) 19 
B) 23 
C) 22 
D) 13 
E) 17 
A) 19 
B) 23 
C) 22 
D) 13 
E) 17

Question 12

The balanced equation involves the corresponding coefficients ________. NaN3 → Na + N₂

Accepted Answer

A)  2: 2: 3 
B)  1: 2: 3 
C)  2: 1: 3 
D)  3: 3: 2 
A)  2: 2: 3 
B)  1: 2: 3 
C)  2: 1: 3 
D)  3: 3: 2

Question 13

The theoretical mass of sulfur dioxide produced from 2.0 moles of sulfuric acid is ________. H₂SO₄ + Cu → SO₂ + H₂O + CuSO₄

Accepted Answer

A)  8.0 g 
B)  16.0 g 
C)  32.0 g 
D)  64.1 g 
A)  8.0 g 
B)  16.0 g 
C)  32.0 g 
D)  64.1 g

Question 14

Which of the following has the greatest number of atoms?

Accepted Answer

A)  (NH₄)3PO₄ 
B)  Na₂P₂O₃ 
C)  (NH₄)2Cr₂O7 
D)  K₄Fe(CNO)6 
A)  (NH₄)3PO₄ 
B)  Na₂P₂O₃ 
C)  (NH₄)2Cr₂O7 
D)  K₄Fe(CNO)6

Question 15

Match each compound with its corresponding percent of carbon.
-C??H?O?

Accepted Answer

A) 48.6% 
B) 55.6% 
C) 69.0% 
D) 33.6% 
E) 41.8% 
A) 48.6% 
B) 55.6% 
C) 69.0% 
D) 33.6% 
E) 41.8%

Question 16

What is the empirical formula of C₈H₆O₃?

Accepted Answer

A)  CHO 
B)  C₄H₃O 
C)  C₄H₃O₂ 
D)  C₈H₆O₃ 
A)  CHO 
B)  C₄H₃O 
C)  C₄H₃O₂ 
D)  C₈H₆O₃

Question 17

What is the mass percent of Sn in tin (IV) oxide?

Accepted Answer

A)  26.96% 
B)  64.97% 
C)  78.77% 
D)  93.69% 
E)  96.73% 
A)  26.96% 
B)  64.97% 
C)  78.77% 
D)  93.69% 
E)  96.73%

Question 18

5.82 g isopropyl alcohol yield 7.001 g of water and 12.6 g of carbon dioxide upon combustion. The empirical formula is ________.

Accepted Answer

A)  CH₂O 
B)  C₃H8O 
C)  C₂H₆O 
D)  C₃H9O 
A)  CH₂O 
B)  C₃H8O 
C)  C₂H₆O 
D)  C₃H9O

Question 19

The empirical formula for a compound that is 48.7% C, 13.6% H and 37.8% N is ________.

Accepted Answer

A)  C₄H9N₂ 
B)  C₃H8N 
C)  C₃H₁₀N₂ 
D)  C₄H₁₀N 
A)  C₄H9N₂ 
B)  C₃H8N 
C)  C₃H₁₀N₂ 
D)  C₄H₁₀N

Question 20

The theoretical number of moles of carbon dioxide produced from 3.0 moles of C₆H14 is ________. C₆H14 + O₂ → CO₂ + H₂O

Accepted Answer

A)  3.0 
B)  6.0 
C)  9.0 
D)  18 
A)  3.0 
B)  6.0 
C)  9.0 
D)  18

Which contains the highest percentage of oxygen?

One mole of hydrogen gas has 6.02 x 10²³ atoms

Alkynes have the general molecular formula CnH₂n_-2. Thus, when n = 2, the alkyne is C₂H₂ etc. If an alkyne has a molecular mass between 75 and 85, this alkyne is ________.

Which statement is true about the molecular formula?

Match each compound with its corresponding percent of nitrogen. -(NH?)2CO?

Which of the following compounds is expected to have oxygen?

Which of the following abides by the principle of mass conservation according to the balanced reaction? 4 K + O₂ → 2 K₂O

The theoretical number of moles of nitrogen produced from 6 moles of NaN₃ is ________. NaN₃ → Na + N₂

The percent of nitrogen in ferric nitrate is 17.4%.

Which of the following will not have the same number atoms as the other three choices?

Match each compound with its corresponding number of atoms per formula unit. -Al (C?H?O?)₃

The balanced equation involves the corresponding coefficients ________. NaN₃ → Na + N₂

The theoretical mass of sulfur dioxide produced from 2.0 moles of sulfuric acid is ________. H₂SO₄ + Cu → SO₂ + H₂O + CuSO₄

Which of the following has the greatest number of atoms?

Match each compound with its corresponding percent of carbon. -C??H?O?

What is the empirical formula of C₈H₆O₃?

What is the mass percent of Sn in tin (IV) oxide?

5.82 g isopropyl alcohol yield 7.001 g of water and 12.6 g of carbon dioxide upon combustion. The empirical formula is ________.

The empirical formula for a compound that is 48.7% C, 13.6% H and 37.8% N is ________.

The theoretical number of moles of carbon dioxide produced from 3.0 moles of C₆H₁₄ is ________. C₆H₁₄ + O₂ → CO₂ + H₂O

What Is Chemistry

The Numerical Side of Chemistry

The Evolution of Atomic Theory

The Modern Model of the Atom

Chemical Bonding and Nomenclature

The Shape of Molecules

Intermolecular Forces and the Phases of Matter

Chemical Reactions

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 9: Stoichiometry and the Mole

Which contains the highest percentage of oxygen?

One mole of hydrogen gas has 6.02 x 1023 atoms

Alkynes have the general molecular formula CnH₂n-2. Thus, when n = 2, the alkyne is C₂H₂ etc. If an alkyne has a molecular mass between 75 and 85, this alkyne is ________.

Which statement is true about the molecular formula?

Match each compound with its corresponding percent of nitrogen. -(NH?)2CO?

Which of the following compounds is expected to have oxygen?

Which of the following abides by the principle of mass conservation according to the balanced reaction? 4 K + O₂ → 2 K₂O

The theoretical number of moles of nitrogen produced from 6 moles of NaN3 is ________. NaN3 → Na + N₂

The percent of nitrogen in ferric nitrate is 17.4%.

Which of the following will not have the same number atoms as the other three choices?

Match each compound with its corresponding number of atoms per formula unit. -Al (C?H?O?)3

The balanced equation involves the corresponding coefficients ________. NaN3 → Na + N₂

The theoretical mass of sulfur dioxide produced from 2.0 moles of sulfuric acid is ________. H₂SO₄ + Cu → SO₂ + H₂O + CuSO₄

Which of the following has the greatest number of atoms?

Match each compound with its corresponding percent of carbon. -C??H?O?

What is the empirical formula of C₈H₆O₃?

What is the mass percent of Sn in tin (IV) oxide?

5.82 g isopropyl alcohol yield 7.001 g of water and 12.6 g of carbon dioxide upon combustion. The empirical formula is ________.

The empirical formula for a compound that is 48.7% C, 13.6% H and 37.8% N is ________.

The theoretical number of moles of carbon dioxide produced from 3.0 moles of C₆H14 is ________. C₆H14 + O₂ → CO₂ + H₂O

What Is Chemistry

The Numerical Side of Chemistry

The Evolution of Atomic Theory

The Modern Model of the Atom

Chemical Bonding and Nomenclature

The Shape of Molecules

Intermolecular Forces and the Phases of Matter

Chemical Reactions

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

One mole of hydrogen gas has 6.02 x 10²³ atoms

Alkynes have the general molecular formula CnH₂n_-2. Thus, when n = 2, the alkyne is C₂H₂ etc. If an alkyne has a molecular mass between 75 and 85, this alkyne is ________.

The theoretical number of moles of nitrogen produced from 6 moles of NaN₃ is ________. NaN₃ → Na + N₂

Match each compound with its corresponding number of atoms per formula unit. -Al (C?H?O?)₃

The balanced equation involves the corresponding coefficients ________. NaN₃ → Na + N₂

The theoretical number of moles of carbon dioxide produced from 3.0 moles of C₆H₁₄ is ________. C₆H₁₄ + O₂ → CO₂ + H₂O