Question 1

Which one of the following substances is the best electrolyte?

Accepted Answer

A)  CO
B)  CH3Cl
C)  CH4
D)  C2H5OH
E)  HClF) A) and D)
G) A) and C)

Question 2

Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate.
2NaCl(aq) + Hg2(NO3) 2(aq)   →	o→  NaNO3(aq) + Hg2Cl2(s)

Accepted Answer

A)  Na+(aq) + NO3-(aq)   →	o→  NaNO3(aq) 
B)  Hg22+(aq) + 2Cl-(aq)   →	o→  Hg2Cl2(s) 
C)  NaCl(aq)   →	o→ Na+(aq) + Cl-(aq) 
D)  Hg2(NO3) 2(aq)   →	o→  Hg22+(aq) + 2NO3-(aq) 
E)  Hg22+(aq)   →	o→  Hg2(s)  F) A) and B)
G) A) and C)

Question 3

Select the classification for the following reaction.
H2(g) + Cl2(g)   →	o→  2HCl(g)

Accepted Answer

A)  combination
B)  decomposition
C)  displacement
D)  acid-base
E)  None of these choices is correct. F) A) and B)
G) D) and E) A

Question 4

A standard solution of 0.243 M NaOH was used to determine the concentration of a hydrochloric acid solution.If 46.33 mL of NaOH is needed to neutralize 10.00 mL of the acid,what is the molar concentration of the acid?

Accepted Answer

A)  0.0524 M
B)  0.888 M
C)  1.13 M
D)  2.26 M
E)  2.43 MF) All of the above
G) A) and B)

Question 5

Identify the oxidizing agent in the following redox reaction.
Hg2+(aq) + Cu(s)   →	o→  Cu2+(aq) + Hg(l)

Accepted Answer

A)  Hg2+(aq) 
B)  Cu(s) 
C)  Cu2+(aq) 
D)  Hg(l) 
E)  Hg2+(aq) and Cu2+(aq)  F) A) and E)
G) B) and E) A

Question 6

Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(II) nitrate.

Accepted Answer

A)  CuS
B)  Cu2S
C)  NH4NO3
D)  NH4(NO3) 2
E)  CuSO4F) A) and D)
G) A) and E) A

Question 7

Sodium thiosulfate,Na2S2O3,is used as a "fixer" in black and white photography.Identify the reducing agent in the reaction of thiosulfate with iodine.
2S2O32-(aq) + I2(aq)   →	o→  S4O62-(aq) + 2I-(aq)

Accepted Answer

A)  I2(aq) 
B)  I-(aq) 
C)  S2O32-(aq) 
D)  S4O62-(aq) 
E)  S2O32-(aq) and I-(aq)  F) A) and E)
G) A) and B)

Question 8

Write down the oxidation number of the indicated atom in each of the following formulas:
a.Si in SiO2
b.Cl in ClO2-
 c.Mn in KMnO4
 d.C in C6H12O6

Accepted Answer

Question 9

The combustion of an element is always a combination reaction.

Accepted Answer

A) True 
 B)False

Question 10

Complete and balance the equation for the following acid-base reaction.
Ca(OH)2(aq)+ HCl(aq) $\to$

Accepted Answer

Ca(OH)₂(a...

Question 11

A combination reaction may also be a displacement reaction.

Accepted Answer

A) True 
 B)False

Question 12

Select the precipitate that forms when the following reactants are mixed.
Na2CO3(aq) + BaCl2(aq)   →	o→

Accepted Answer

A)  Ba2CO3
B)  BaCO3
C)  NaCl
D)  NaCl2
E)  BaO F) A) and B)
G) A) and E)

Question 13

A 0.00100 mol sample of Ca(OH) 2 requires 25.00 mL of aqueous HCl for neutralization according to the reaction below.What is the concentration of the HCl?
Equation: Ca(OH) 2(s) + 2HCl(aq)   →	o→  CaCl2(aq) + H2O(l)

Accepted Answer

A)  0.0200 M
B)  0.0400 M
C)  0.0800 M
D)  4.00  ×	imes×  10-5 M
E)  None of these choices is correct. F) A) and C)
G) D) and E)

Question 14

All combustion reactions are classified as combination reactions.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following is a strong base?

Accepted Answer

A)  NH3
B)  Ca(OH) 2
C)  Al(OH) 3
D)  B(OH) 3
E)  CH3OHF) A) and B)
G) B) and D)

Question 16

How many sodium ions are present in 325 mL of 0.850 M Na2SO4?

Accepted Answer

A)  1.66  ×	imes×  1023 Na ions
B)  3.33  ×	imes×  1023 Na ions
C)  4.99  ×	imes×  1023 Na ions
D)  6.20  ×	imes×  1023 Na ions
E)  1.57  ×	imes×  1024 Na ions F) A) and B)
G) B) and C)

Question 17

Identify all the spectator ions in the following reaction.
2KMnO4(aq) + 10FeSO4(aq) + 8H2SO4(aq)   →	o→ K2SO4(aq) + 2MnSO4(aq) + 5Fe2(SO4) 3(aq) + 8H2O(l)

Accepted Answer

A)  only K+
B)  only SO42-
C)  only K+ and SO42-
D)  only K+,SO42- and Fe2+
E)  only K+,SO42-,Fe2+ and Mn2+ F) A) and C)
G) C) and D)

Question 18

Which of the following solutions will be the best conductor of electrical current?

Accepted Answer

A)  methyl alcohol,CH3OH(aq) 
B)  glucose,C6H12O6(aq) 
C)  potassium chloride,KCl(aq) 
D)  bromine,Br2(aq) 
E)  ethylene glycol,C2H6O2(aq) F) B) and E)
G) A) and D)

Question 19

Which of the following is a strong acid?

Accepted Answer

A)  H3PO4
B)  HNO3
C)  HF
D)  CH3COOH
E)  H2OF) B) and C)
G) A) and E)

Question 20

Sulfuric acid (H2SO4)reacts with potassium hydroxide (KOH)as follows.
H2SO4(aq)+ 2KOH(aq) $\to$K2SO4(aq)+ 2H2O(l)
Calculate the volume of 0.100 M sulfuric acid required to neutralize 25.0 mL of 0.0821 M KOH.Show all your work.

Accepted Answer

The answer of Sulfuric acid (H2SO4)reacts with potassium hydroxide (KOH)as...

Exam 4: Three Major Classes of Chemical Reactions

Which one of the following substances is the best electrolyte?

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Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate. 2NaCl(aq) + Hg2(NO3) 2(aq) →\to→ NaNO3(aq) + Hg2Cl2(s)

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Select the classification for the following reaction. H2(g) + Cl2(g) →\to→ 2HCl(g)

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A standard solution of 0.243 M NaOH was used to determine the concentration of a hydrochloric acid solution.If 46.33 mL of NaOH is needed to neutralize 10.00 mL of the acid,what is the molar concentration of the acid?

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Identify the oxidizing agent in the following redox reaction. Hg2+(aq) + Cu(s) →\to→ Cu2+(aq) + Hg(l)

Correct AnswerverifiedA

Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(II) nitrate.

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Sodium thiosulfate,Na2S2O3,is used as a "fixer" in black and white photography.Identify the reducing agent in the reaction of thiosulfate with iodine. 2S2O32-(aq) + I2(aq) →\to→ S4O62-(aq) + 2I-(aq)

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Write down the oxidation number of the indicated atom in each of the following formulas: a.Si in SiO2 b.Cl in ClO2- c.Mn in KMnO4 d.C in C6H12O6

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The combustion of an element is always a combination reaction.

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Complete and balance the equation for the following acid-base reaction. Ca(OH)2(aq)+ HCl(aq) →\to→

Correct AnswerverifiedCa(OH)2(a...View AnswerShow Answer

A combination reaction may also be a displacement reaction.

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Select the precipitate that forms when the following reactants are mixed. Na2CO3(aq) + BaCl2(aq) →\to→

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A 0.00100 mol sample of Ca(OH) 2 requires 25.00 mL of aqueous HCl for neutralization according to the reaction below.What is the concentration of the HCl? Equation: Ca(OH) 2(s) + 2HCl(aq) →\to→ CaCl2(aq) + H2O(l)

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All combustion reactions are classified as combination reactions.

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Which of the following is a strong base?

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How many sodium ions are present in 325 mL of 0.850 M Na2SO4?

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Identify all the spectator ions in the following reaction. 2KMnO4(aq) + 10FeSO4(aq) + 8H2SO4(aq) →\to→ K2SO4(aq) + 2MnSO4(aq) + 5Fe2(SO4) 3(aq) + 8H2O(l)

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Which of the following solutions will be the best conductor of electrical current?

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Which of the following is a strong acid?

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Sulfuric acid (H2SO4)reacts with potassium hydroxide (KOH)as follows. H2SO4(aq)+ 2KOH(aq) →\to→ K2SO4(aq)+ 2H2O(l) Calculate the volume of 0.100 M sulfuric acid required to neutralize 25.0 mL of 0.0821 M KOH.Show all your work.

Correct AnswerverifiedShow Answer

Correct Answer
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Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate. 2NaCl(aq) + Hg₂(NO₃) ₂(aq) $\to$ NaNO₃(aq) + Hg₂Cl₂(s)

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Select the classification for the following reaction. H₂(g) + Cl₂(g) $\to$ 2HCl(g)

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A

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Identify the oxidizing agent in the following redox reaction. Hg²⁺(aq) + Cu(s) $\to$ Cu²⁺(aq) + Hg(l)

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A

Correct Answer
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A

Sodium thiosulfate,Na₂S₂O₃,is used as a "fixer" in black and white photography.Identify the reducing agent in the reaction of thiosulfate with iodine. 2S₂O₃^2-(aq) + I₂(aq) $\to$ S₄O₆^2-(aq) + 2I^-(aq)

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Write down the oxidation number of the indicated atom in each of the following formulas: a.Si in SiO₂ b.Cl in ClO₂^- c.Mn in KMnO₄ d.C in C₆H₁₂O₆

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Correct Answer
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Complete and balance the equation for the following acid-base reaction. Ca(OH)₂(aq)+ HCl(aq) $\to$

Correct Answer
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Ca(OH)₂(a...
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Select the precipitate that forms when the following reactants are mixed. Na₂CO₃(aq) + BaCl₂(aq) $\to$

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A 0.00100 mol sample of Ca(OH) ₂ requires 25.00 mL of aqueous HCl for neutralization according to the reaction below.What is the concentration of the HCl? Equation: Ca(OH) ₂(s) + 2HCl(aq) $\to$ CaCl₂(aq) + H₂O(l)

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Correct Answer
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Correct Answer
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How many sodium ions are present in 325 mL of 0.850 M Na₂SO₄?

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Identify all the spectator ions in the following reaction. 2KMnO₄(aq) + 10FeSO₄(aq) + 8H₂SO₄(aq) $\to$ K₂SO₄(aq) + 2MnSO₄(aq) + 5Fe₂(SO₄) ₃(aq) + 8H₂O(l)

Correct Answer
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Correct Answer
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Correct Answer
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Sulfuric acid (H₂SO₄)reacts with potassium hydroxide (KOH)as follows. H₂SO₄(aq)+ 2KOH(aq) $\to$ K₂SO₄(aq)+ 2H₂O(l) Calculate the volume of 0.100 M sulfuric acid required to neutralize 25.0 mL of 0.0821 M KOH.Show all your work.

Correct Answer
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