Question 1

How many N2O4 molecules are contained in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g/mol.

Accepted Answer

A)  5.54 × 1025 N2O4 molecules
B)  7.26 × 1023 N2O4 molecules
C)  1.38 × 1024 N2O4 molecules
D)  4.59 × 1025 N2O4 molecules
E)  4.99 × 1023 N2O4 molecules

Question 2

Which of the following is a molecular element?

Accepted Answer

A)  Kr
B)  Ag
C)  S
D)  Mg
E)  Ti

Question 3

Which of the following is a molecular element?

Accepted Answer

A)  Mg
B)  Ar
C)  Xe
D)  I
E)  Li

Question 4

How many millimoles of Ca(NO3) 2 contain 4.78 × 1022 formula units of Ca(NO3) 2? The molar mass of Ca(NO3) 2 is 164.10 g/mol.

Accepted Answer

A)  12.6 mmol Ca(NO3) 2
B)  13.0 mmol Ca(NO3) 2
C)  20.7 mmol Ca(NO3) 2
D)  79.4 mmol Ca(NO3) 2
E)  57.0 mmol Ca(NO3) 2

Question 5

Match the following.
-neon

Accepted Answer

A)  I(s) 
B)  Cl(g) 
C)  O(g) 
D)  Cl2(g) 
E)  Ne2(g) F) Ne(g) G) Ca(s) H) Q2(g) I) I2(s) J) Ca2(s)

Question 6

Give the name for SnO.

Accepted Answer

A)  tin (I) oxide
B)  tin (II) oxide
C)  tin (III) oxide
D)  tin (IV) oxide

Question 7

Calculate the molar mass of Al(C2H3O2) 3.

Accepted Answer

A)  86.03 g/mol
B)  204.13 g/mol
C)  56.00 g/mol
D)  258.09 g/mol
E)  139.99 g/mol

Question 8

Can you predict the chemical formula for a covalent compound between nitrogen and oxygen? Explain your answer.

Accepted Answer

No,since nitrogen and oxygen a...

Question 9

Give the name for HNO2.

Accepted Answer

Question 10

Calculate the mass percent composition of sulfur in Al2(SO4) 3.

Accepted Answer

A)  28.12%
B)  9.372%
C)  42.73%
D)  21.38%
E)  35.97%

Question 11

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

Accepted Answer

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

Question 12

Write a possible molecular formula for C4H4O.

Accepted Answer

A)  C8H8O2
B)  C12H12O2
C)  C2H2O
D)  C8H8O

Question 13

Match the following.
-chlorine

Accepted Answer

A)  I(s) 
B)  Cl(g) 
C)  O(g) 
D)  Cl2(g) 
E)  Ne2(g) F) Ne(g) G) Ca(s) H) Q2(g) I) I2(s) J) Ca2(s)

Question 14

The solid compound,Na4SiO4,contains

Accepted Answer

A)  Na+,Si4+,and O2- ions.
B)  Na+ and SiO44- ions.
C)  Na4+ and SiO44- ions.
D)  Na4SiO4 molecules.

Question 15

The chemical formula for lithium peroxide is

Accepted Answer

A)  LiOH.
B)  LiO2.
C)  Li2O.
D)  Li2O2.

Question 16

What is the molar mass of nitrogen gas?

Accepted Answer

A)  14.0 g/mol
B)  28.0 g/mol
C)  6.02 × 1023 g/mol
D)  1.20 × 1023 g/mol

Question 17

Which of the following is an ionic compound?

Accepted Answer

A)  SCl2
B)  Mg3(PO4) 2
C)  Cl2O
D)  CH2O
E)  PF5

Question 18

Which of the following is an atomic element?

Accepted Answer

A)  Br
B)  H
C)  N
D)  O
E)  Mg

Question 19

Write a balanced equation to show the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite.

Accepted Answer

A)  H2SO4(aq) + LiOH(aq) → H2O(l) + Li2SO4(aq) 
B)  H2SO3(aq) + 2 LiOH(aq) → 2 H2O(l) + Li2SO3(aq) 
C)  HSO3(aq) + LiOH(aq) → H2O(l) + LiSO3(aq) 
D)  HSO4(aq) + LiOH(aq) → H2O(l) + LiSO4(aq) 
E)  H2S(aq) + 2 LiOH(aq) → 2 H2O(l) + Li2S(aq)

Question 20

Give the correct formula for aluminum sulfate.

Accepted Answer

A)  Al22SO4
B)  Al(SO4) 3
C)  Al3(SO4) 2
D)  Al2(SO4) 3

Exam 3: Molecules, Compounds and Chemical Equations

Which of the following is a molecular element?

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Match the following. -neon

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The solid compound,Na4SiO4,contains

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Can you predict the chemical formula for a covalent compound between nitrogen and oxygen? Explain your answer.

Correct AnswerverifiedNo,since nitrogen and oxygen a...View AnswerShow Answer

How many N2O4 molecules are contained in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g/mol.

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Write a possible molecular formula for C4H4O.

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Calculate the mass percent composition of sulfur in Al2(SO4) 3.

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Give the correct formula for aluminum sulfate.

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Which of the following is an atomic element?

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Give the name for SnO.

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What is the molar mass of nitrogen gas?

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Write a balanced equation to show the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite.

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Give the name for HNO2.

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Which of the following is an ionic compound?

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Calculate the molar mass of Al(C2H3O2) 3.

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How many millimoles of Ca(NO3) 2 contain 4.78 × 1022 formula units of Ca(NO3) 2? The molar mass of Ca(NO3) 2 is 164.10 g/mol.

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Which of the following is a molecular element?

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Match the following. -chlorine

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The chemical formula for lithium peroxide is

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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 and its molar mass is 86.17 g/mol.

Correct AnswerverifiedShow Answer

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The solid compound,Na₄SiO₄,contains

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No,since nitrogen and oxygen a...
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How many N₂O₄ molecules are contained in 76.3 g N₂O₄? The molar mass of N₂O₄ is 92.02 g/mol.

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Write a possible molecular formula for C₄H₄O.

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Calculate the mass percent composition of sulfur in Al₂(SO₄) ₃.

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Give the name for HNO₂.

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Calculate the molar mass of Al(C₂H₃O₂) ₃.

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How many millimoles of Ca(NO₃) ₂ contain 4.78 × 10²² formula units of Ca(NO₃) ₂? The molar mass of Ca(NO₃) ₂ is 164.10 g/mol.

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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 and its molar mass is 86.17 g/mol.

Correct Answer
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