Question 1

What is the structure of the covalent compound formed by nitrogen and oxygen? Is this the only possibility? Explain.

Accepted Answer

Since nitrogen and oxygen are both nonmetals, they combine by sharing electrons. This can be done in multiple ways. Some possible compounds are N₂O, N₂O₃, NO₂.

Question 2

Which of the compounds, Na H , HS , C4H10, BrF3,are ionic compounds?

Accepted Answer

A)  only C4H10
B)  only Na H 
C)  Na H  and HS 
D)  HS , C4H10, and BrF3 B

Question 3

What is the chemical formula for calcium hydroxide?

Accepted Answer

A)  CaH2
B)  CaOH
C)  CaOH2
D)  Ca(OH) 2

Question 4

Which of the compounds, C4H10, BaCl2, Ni(NO3) 2, SF6, are expected to exist as molecules?

Accepted Answer

A)  only C4H10
B)  C4H10 and SF6
C)  C4H10, Ni(NO3) 2, and SF6
D)  BaCl2 and Ni(NO3) 2

Question 5

Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g mL-1 and its molar mass is 86.17 g mol-1.

Accepted Answer

A)  8.59 mL
B)  13.5 mL
C)  7.40 mL
D)  12.4 mL
E)  11.6 mL

Question 6

Determine the name for P4O10.

Accepted Answer

A)  phosphorus(IV) oxide
B)  diphosphorus pentoxide
C)  phosphorus oxide
D)  phosphorus(II) oxide
E)  tetraphosphorus decoxide

Question 7

The compound CO is named

Accepted Answer

A)  carbonate.
B)  carbonite.
C)  carbon dioxide.
D)  carbon(IV) oxide.

Question 8

Which of the following is a molecular compound?

Accepted Answer

A)  NaCN
B)  LiOH
C)  SrI2
D)  ZnS
E)  P4O10

Question 9

What is the empirical formula for C4H10O2?

Accepted Answer

A)  C2H5O
B)  CHO
C)  C2H4O
D)  CHO2
E)  CH2O

Question 10

How many C2H4 molecules are contained in 45.8 mg of C2H4? The molar mass of C2H4 is 28.05 g mol-1.

Accepted Answer

A)  9.83 × 1020 C2H4 molecules
B)  7.74 × 1026 C2H4 molecules
C)  2.71 × 1020 C2H4 molecules
D)  3.69 × 1023 C2H4 molecules
E)  4.69 × 1023 C2H4 molecules

Question 11

How many moles of N2O3 contain 2.55 × 1024 oxygen atoms?

Accepted Answer

A)  1.41 moles N2O3
B)  4.23 moles N2O3
C)  12.7 moles N2O3
D)  7.87 moles N2O3
E)  2.82 moles N2O3

Question 12

Identify the sulfite ion.

Accepted Answer

A)  S O-23
B)  HS O-3
C)  S2-
D)  S O-24
E)  HSO-4

Question 13

Combustion analysis of 1.200 g of an unknown compound containing carbon, hydrogen, and oxygen produced 2.086 g of CO2 and 1.134 g of H2O. What is the empirical formula of the compound?

Accepted Answer

A)  C2H5O
B)  C2H5O2
C)  C2H10O3
D)  C3H8O2 D

Question 14

Which of the following has the smallest mass?

Accepted Answer

A)  3.50 × 1023 molecules of I2
B)  85.0 g of Cl2
C)  2.50 mol of F2
D)  0.050 kg of Br2

Question 15

What is the chemical formula for magnesium hydride?

Accepted Answer

A)  MgH2
B)  MgOH
C)  MgOH2
D)  Mg(OH) 2

Question 16

Give the mass percent of carbon in C14H19NO2.

Accepted Answer

A)  38.89%
B)  72 .07%
C)  5.17%
D)  2.78%

Question 17

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 g

Question 18

An aqueous solution of H2S is named

Accepted Answer

A)  hydrosulfuric acid.
B)  hydrosulfurous acid.
C)  sulfuric acid.
D)  sulfurous acid.

Question 19

Determine the name for aqueous HBr.

Accepted Answer

A)  bromic acid
B)  bromous acid
C)  hydrobromous acid
D)  hydrogen bromate
E)  hydrobromic acid

Question 20

Identify the charge, X, on the phosphide ion PX

Accepted Answer

A)  -4
B)  -3
C)  -2
D)  -1
E)  +1

Exam 3: Molecules, Compounds, and Nomenclature

What is the structure of the covalent compound formed by nitrogen and oxygen? Is this the only possibility? Explain.

Correct AnswerverifiedSince nitrogen and oxygen are both nonmetals, they combine by sharing electrons. This can be done in multiple ways. Some possible compounds are N2O, N2O3, NO2.

Which of the compounds, Na H , HS , C4H10, BrF3,are ionic compounds?

Correct AnswerverifiedB

What is the chemical formula for calcium hydroxide?

Correct AnswerverifiedShow Answer

Which of the compounds, C4H10, BaCl2, Ni(NO3) 2, SF6, are expected to exist as molecules?

Correct AnswerverifiedShow Answer

Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g mL-1 and its molar mass is 86.17 g mol-1.

Correct AnswerverifiedShow Answer

Determine the name for P4O10.

Correct AnswerverifiedShow Answer

The compound CO is named

Correct AnswerverifiedShow Answer

Which of the following is a molecular compound?

Correct AnswerverifiedShow Answer

What is the empirical formula for C4H10O2?

Correct AnswerverifiedShow Answer

How many C2H4 molecules are contained in 45.8 mg of C2H4? The molar mass of C2H4 is 28.05 g mol-1.

Correct AnswerverifiedShow Answer

How many moles of N2O3 contain 2.55 × 1024 oxygen atoms?

Correct AnswerverifiedShow Answer

Identify the sulfite ion.

Correct AnswerverifiedShow Answer

Combustion analysis of 1.200 g of an unknown compound containing carbon, hydrogen, and oxygen produced 2.086 g of CO2 and 1.134 g of H2O. What is the empirical formula of the compound?

Correct AnswerverifiedD

Which of the following has the smallest mass?

Correct AnswerverifiedShow Answer

What is the chemical formula for magnesium hydride?

Correct AnswerverifiedShow Answer

Give the mass percent of carbon in C14H19NO2.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An aqueous solution of H2S is named

Correct AnswerverifiedShow Answer

Determine the name for aqueous HBr.

Correct AnswerverifiedShow Answer

Identify the charge, X, on the phosphide ion PX

Correct AnswerverifiedShow Answer

Correct Answer
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Since nitrogen and oxygen are both nonmetals, they combine by sharing electrons. This can be done in multiple ways. Some possible compounds are N₂O, N₂O₃, NO₂.

Which of the compounds, NaH, HS, C₄H₁₀, BrF₃,are ionic compounds?

Correct Answer
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B

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Which of the compounds, C₄H₁₀, BaCl₂, Ni(NO₃) ₂, SF_6, are expected to exist as molecules?

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Determine the volume of hexane that contains 5.33 × 10²² molecules of hexane. The density of hexane is 0.6548 g mL^-1 and its molar mass is 86.17 g mol^-1.

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Determine the name for P₄O₁₀.

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What is the empirical formula for C₄H₁₀O₂?

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How many C₂H₄ molecules are contained in 45.8 mg of C₂H₄? The molar mass of C₂H₄ is 28.05 g mol^-1.

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How many moles of N₂O₃ contain 2.55 × 10²⁴ oxygen atoms?

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Combustion analysis of 1.200 g of an unknown compound containing carbon, hydrogen, and oxygen produced 2.086 g of CO₂ and 1.134 g of H₂O. What is the empirical formula of the compound?

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D

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Give the mass percent of carbon in C₁₄H₁₉NO₂.

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

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An aqueous solution of H₂S is named

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Identify the charge, X, on the phosphide ion P^X

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