Question 1

What is the chemical formula for iron( III)  sulfate?

Accepted Answer

A)   Fe3S
B)   Fe3SO4
C)   Fe2S3
D)   Fe2( SO4) 3E) A) and B)
F) None of the above

Question 2

What is the mass of a single fluorine molecule, F2?

Accepted Answer

A)   3.155 × 10-23 g
B)   6.310 × 10-23 g
C)   19.00 g
D)   38.00 gE) B) and D)
F) A) and B)

Question 3

How many molecules are in 16.61 g of acetic acid, C2H4O2?

Accepted Answer

A)   6.007 × 1026
B)   6.0375 × 1023
C)   1.666 × 1023
D)   6.0375 × 1020
E)   6.004 × 10-24F) A) and E)
G) B) and D)

Question 4

What is the empirical formula of a compound that is 66.6% C, 11.2% H, and 22.2% O by mass?

Accepted Answer

A)   C5H10O2
B)   C8HO4
C)   C6H12O2
D)   C4H8O
E)   C4H2OF) B) and C)
G) A) and E)

Question 5

A sample of pure lithium nitrate contains 10.1% lithium by mass. What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample?

Accepted Answer

A)   5.05%
B)   10.1%
C)   20.2%
D)   40.4%E) A) and B)
F) A) and C)

Question 6

Determine the name for Cl2O.

Accepted Answer

A)   chlorine oxide
B)   dichlorine monoxide
C)   chlorine(I)  oxide
D)   chlorine(II)  oxide
E)   chlorateF) C) and D)
G) B) and D)

Question 7

The chemical formula for the selenite ion is ________.

Accepted Answer

A)   Se-
B)   Se2-
C)   SeO32-
D)   SeO42-E) A) and B)
F) A) and C)

Question 8

What is the empirical formula for Hg2(NO3) 2?

Accepted Answer

A)   Hg2(NO3) 2
B)   HgNO3
C)   Hg(NO3) 2
D)   Hg2NO3
E)   Hg4(NO3) 4F) A) and B)
G) D) and E)

Question 9

The compound ClO is named ________.

Accepted Answer

A)   chlorite
B)   hypochlorite
C)   chlorine monoxide
D)   chlorine ( II)  oxideE) A) and C)
F) None of the above

Question 10

Identify the formula for strontium nitride.

Accepted Answer

A)   Sr3N2
B)   Sr(NO3) 2
C)   SrN
D)   Sr2N3
E)   Sr(NO2) 2F) A) and E)
G) A) and D)

Question 11

A typical cup of coffee has about 100. mg of caffeine. Calculate the number of caffeine molecules in 100. mg C8H10N4O2.

Accepted Answer

A)   3.22 × 10-21
B)   3.10 × 1020
C)   1.17 × 1025
D)   3.10 × 1022
E)   3.10 × 1025F) A) and B)
G) B) and E)

Question 12

Hematite is the mineral form of iron(III)  oxide. Calculate the number of iron ions in 20.0 kg of pure hematite.

Accepted Answer

A)   1.51 × 1026 
B)   7.54 × 1025
C)   3.77 × 1017
D)   6.63 × 10-27
E)   9.62 × 1021F) B) and C)
G) All of the above

Question 13

Identify the compound with (an)  ionic bond(s) .

Accepted Answer

A)   SO2
B)   CO
C)   O2
D)   H2O
E)   KBrF) A) and C)
G) B) and D)

Question 14

Which one of the following contains 39% carbon by mass?

Accepted Answer

A)   C2H2
B)   CH4
C)   CH3NH2
D)   CO2E) A) and B)
F) A) and C)

Question 15

What is the mass of 9.44 × 1024 molecules of NO2? The molar mass of NO2 is 46.01 g mol-1.

Accepted Answer

A)   205 g
B)   294 g
C)   721 g
D)   341 g
E)   685 gF) A) and B)
G) B) and E)

Question 16

The solid compound Na2CO3 contains ________.

Accepted Answer

A)   Na+, C4+, and O2- ions
B)   Na+ and CO3 -2 ions
C)   Na2+ and CO3 -2 ions
D)   Na2CO3 moleculesE) All of the above
F) A) and B)

Question 17

How many molecules of butane are contained in 25.0 mL of butane? The density of butane is 0.6011 g mL-1 and the molar mass is 58.12 g mol-1.

Accepted Answer

A)   2.59 × 1023 molecules butane
B)   1.46 × 1027 molecules butane
C)   6.87 × 1023 molecules butane
D)   1.56 × 1023 molecules butane
E)   7.14 × 1025 molecules butaneF) All of the above
G) A) and C)

Question 18

Identify the name for SnO.

Accepted Answer

A)   tin(I)  oxide
B)   tin(II)  oxide
C)   tin(III)  oxide
D)   tin(IV)  oxideE) None of the above
F) A) and B)

Question 19

Which of the following elements has the LEAST tendency to form an ion?

Accepted Answer

A)   Ca
B)   K
C)   Kr
D)   SeE) C) and D)
F) B) and C)

Question 20

What mass of phosphorus pentafluoride, PF5, has the same number of fluorine atoms as 25.0 g of oxygen difluoride, OF2?

Accepted Answer

A)   0.933 g
B)   10.0 g
C)   23.3 g
D)   146 gE) B) and C)
F) A) and D)

Exam 3: Molecules, Compounds, and Nomenclature

Identify the compound with (an) ionic bond(s) .

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A sample of pure lithium nitrate contains 10.1% lithium by mass. What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample?

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Which one of the following contains 39% carbon by mass?

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Identify the name for SnO.

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The chemical formula for the selenite ion is ________.

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Determine the name for Cl2O.

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How many molecules of butane are contained in 25.0 mL of butane? The density of butane is 0.6011 g mL-1 and the molar mass is 58.12 g mol-1.

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What is the empirical formula of a compound that is 66.6% C, 11.2% H, and 22.2% O by mass?

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How many molecules are in 16.61 g of acetic acid, C2H4O2?

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What mass of phosphorus pentafluoride, PF5, has the same number of fluorine atoms as 25.0 g of oxygen difluoride, OF2?

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The compound ClO is named ________.

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A typical cup of coffee has about 100. mg of caffeine. Calculate the number of caffeine molecules in 100. mg C8H10N4O2.

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What is the chemical formula for iron( III) sulfate?

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What is the mass of a single fluorine molecule, F2?

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Identify the formula for strontium nitride.

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What is the mass of 9.44 × 1024 molecules of NO2? The molar mass of NO2 is 46.01 g mol-1.

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The solid compound Na2CO3 contains ________.

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What is the empirical formula for Hg2(NO3) 2?

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Which of the following elements has the LEAST tendency to form an ion?

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Hematite is the mineral form of iron(III) oxide. Calculate the number of iron ions in 20.0 kg of pure hematite.

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Determine the name for Cl₂O.

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How many molecules of butane are contained in 25.0 mL of butane? The density of butane is 0.6011 g mL^-1 and the molar mass is 58.12 g mol^-1.

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How many molecules are in 16.61 g of acetic acid, C₂H₄O₂?

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What mass of phosphorus pentafluoride, PF₅, has the same number of fluorine atoms as 25.0 g of oxygen difluoride, OF₂?

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The compound ClOis named ________.

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A typical cup of coffee has about 100. mg of caffeine. Calculate the number of caffeine molecules in 100. mg C₈H₁₀N₄O₂.

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What is the mass of a single fluorine molecule, F₂?

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What is the mass of 9.44 × 10²⁴ molecules of NO₂? The molar mass of NO₂ is 46.01 g mol^-1.

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The solid compound Na₂CO₃ contains ________.

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What is the empirical formula for Hg₂(NO₃) ₂?

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