Question 1

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 2

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 3

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 4

Which of the following is a molecular element?

Accepted Answer

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

Question 5

Which of the following is a molecular element?

Accepted Answer

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

Question 6

Give the correct formula for aluminum sulfate.

Accepted Answer

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

Question 7

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 8

The chemical formula for lithium peroxide is

Accepted Answer

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

Question 9

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 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

Write a possible molecular formula for C4H4O.

Accepted Answer

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

Question 12

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 13

Give the name for SnO.

Accepted Answer

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

Question 14

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 15

Which of the following is an ionic compound?

Accepted Answer

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

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

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 18

Give the name for HNO2.

Accepted Answer

Question 19

Which of the following is an atomic element?

Accepted Answer

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

Question 20

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

Exam 3: Molecules, Compounds and Chemical Equations

Which of the following is an atomic element?

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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

Write a possible molecular formula for C4H4O.

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What is the molar mass of nitrogen gas?

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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.

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Calculate the molar mass of Al(C2H3O2) 3.

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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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Match the following. -chlorine

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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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The solid compound,Na4SiO4,contains

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Give the name for SnO.

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Which of the following is a molecular element?

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

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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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Match the following. -neon

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Which of the following is an ionic compound?

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Give the name for HNO2.

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The chemical formula for lithium peroxide is

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Give the correct formula for aluminum sulfate.

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Which of the following is a molecular element?

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No,since nitrogen and oxygen a...
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Write a possible molecular formula for C₄H₄O.

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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.

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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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The solid compound,Na₄SiO₄,contains

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

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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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Give the name for HNO₂.

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