Question 1

How many molecules are in 1.500 g of riboflavin, C17H20N4O6?

Accepted Answer

A)  1.066 × 1021
B)  4.167 × 10-22
C)  3.400 × 1026
D)  1.067 × 1024
E)  2.400 × 1021F) C) and D)
G) A) and E)

Question 2

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 B)
G) C) and E)

Question 3

Which of the following contains BOTH ionic and covalent bonds?

Accepted Answer

A)  CaI2
B)  COS
C)  CaSO4
D)  SF6
E)  C2H4F) A) and B)
G) A) and C)

Question 4

Determine the molecular formula of a compound that has a molar mass of 92.0 g mol-1 and an empirical formula of NO2.

Accepted Answer

A)  N2O3
B)  N3O6
C)  N2O4
D)  NO2
E)  N2O5F) D) and E)
G) None of the above

Question 5

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 E)
G) A) and C)

Question 6

Identify a carboxylic acid.

Accepted Answer

A)  CH3CH2OCH2CH3
B)  CH3CH2OH
C)  CH3CH2NH2
D)  CH3CH2CH2CH3
E)  CH3COOHF) A) and C)
G) B) and C)

Question 7

Give the name for HNO2.

Accepted Answer

Question 8

Which of the following is an ionic compound?

Accepted Answer

A)  SCl2
B)  Mg3(PO4) 2
C)  Cl2O
D)  CH2O
E)  PF5F) All of the above
G) C) and D)

Question 9

Which one of the following compounds contains ionic bonds?

Accepted Answer

A)  SrO
B)  HBr
C)  PBr3
D)  SiO2E) B) and C)
F) A) and D)

Question 10

What type of bonding is found in the compound OF2?

Accepted Answer

A)  covalent bonding
B)  hydrogen bonding
C)  ionic bonding
D)  metallic bondingE) B) and C)
F) A) and D)

Question 11

Identify a possible molecular formula for C3H5ClO.

Accepted Answer

A)  C6H10ClO2
B)  C5H10Cl2O2
C)  C6H10Cl2O2
D)  C6H10O2
E)  C6H12Cl2O2F) A) and D)
G) A) and E)

Question 12

Identify the formula for barium nitrite.

Accepted Answer

A)  Ba3N2
B)  BaNO3
C)  BN
D)  Ba(NO2) 2
E)  B(NO2) 3F) B) and E)
G) None of the above

Question 13

Calculate the molar mass of Al(C2H3O2) 3.

Accepted Answer

A)  86.03 g mol-1
B)  204.13 g mol-1
C)  56.00 g mol-1
D)  258.09 g mol-1
E)  139.99 g mol-1F) A) and B)
G) B) and D)

Question 14

Identify the name for PBr3.

Accepted Answer

A)  phosphorus tribromide
B)  potassium tribromide
C)  phosphorus(III) bromide
D)  phosphorus(II) bromide
E)  phosphorus bromideF) A) and E)
G) B) and E)

Question 15

Determine the empirical formula for a compound that is 36.86% N and 63.14% O by mass.

Accepted Answer

A)  NO
B)  N2O
C)  NO2
D)  N2O3
E)  NO3F) None of the above
G) A) and E)

Question 16

Identify the formula for barium hydroxide octahydrate.

Accepted Answer

A)  Ba(OH) 2∙8H2O
B)  BaOH∙8H2O
C)  B(OH) 3∙8H2O
D)  8Ba(OH) 2∙H2O
E)  8BaOH∙H2OF) None of the above
G) A) and C)

Question 17

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) B) and C)
G) A) and E)

Question 18

Which of the following has the greatest mass?

Accepted Answer

A)  3.88 × 1022 molecules of O2
B)  1.00 g of O2
C)  0.0312 mol of O2
D)  All of the above have the same mass.E) B) and D)
F) A) and B)

Question 19

Match the following.

-hydrogen

Accepted Answer

A)  H(g) 
B)  Ca2(s) 
C)  I(s) 
D)  Ne2(g) 
E)  I2(s) F) Ne(g) G) Cl2(g) H) Cl(g) I) Ca(s) J) H2(g) K) O(g) L) O2(g) M) B) and E)
N) C) and F)

Question 20

Methane and oxygen react to form carbon dioxide and water. What mass of water is formed if 0.80 g of methane reacts with 3.2 g of oxygen to produce 2.2 g of carbon dioxide?

Accepted Answer

A)  1.8 g
B)  2.2 g
C)  3.7 g
D)  4.0 gE) All of the above
F) A) and D)

Exam 3: Molecules, Compounds, and Nomenclature

Determine the empirical formula for a compound that is 36.86% N and 63.14% O by mass.

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Identify the name for PBr3.

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

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Match the following. -hydrogen

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Identify the formula for barium nitrite.

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Give the name for HNO2.

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What type of bonding is found in the compound OF2?

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Which one of the following compounds contains ionic bonds?

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Which of the following is an ionic compound?

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Which of the following has the greatest mass?

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How many molecules are in 1.500 g of riboflavin, C17H20N4O6?

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Identify a possible molecular formula for C3H5ClO.

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Identify a carboxylic acid.

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Calculate the molar mass of Al(C2H3O2) 3.

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Which of the following contains BOTH ionic and covalent bonds?

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Determine the molecular formula of a compound that has a molar mass of 92.0 g mol-1 and an empirical formula of NO2.

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Identify the formula for barium hydroxide octahydrate.

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Methane and oxygen react to form carbon dioxide and water. What mass of water is formed if 0.80 g of methane reacts with 3.2 g of oxygen to produce 2.2 g of carbon dioxide?

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

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Identify the name for PBr₃.

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

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Give the name for HNO₂.

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What type of bonding is found in the compound OF₂?

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How many molecules are in 1.500 g of riboflavin, C₁₇H₂₀N₄O₆?

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Identify a possible molecular formula for C₃H₅ClO.

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Calculate the molar mass of Al(C₂H₃O₂) ₃.

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Determine the molecular formula of a compound that has a molar mass of 92.0 g mol^-1 and an empirical formula of NO₂.

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

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