Question 1

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)

Question 2

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

Accepted Answer

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

Question 3

Calculate the oxidation number of sulfur in sodium metabisulfite, Na2S2O5.

Accepted Answer

A)   -2
B)   +2
C)   +4
D)   +5
E)   None of these choices is correct.

Question 4

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

Accepted Answer

A)   1.66 * 1023 sodium ions
B)   3.33 *1023 sodium ions
C)   4.99 * 1023 sodium ions
D)   6.20* 1023 sodium ions
E)   1.57 *1024 sodium ions

Question 5

Select the best statement relating to the following reaction: 2MnO2(s)  + KClO3(aq)  + 2KOH(aq)   →\rightarrow→  2KMnO4(aq)  + KCl(aq)  + H2O(l)

Accepted Answer

A)   Mn in MnO2 is oxidized.
B)   O in KClO3 is the oxidizing agent.
C)   K in KClO3 is the reducing agent.
D)   H in KOH is oxidized.
E)   Cl in KClO3 is the reducing agent.

Question 6

All combustion reactions are classified as combination reactions.

Accepted Answer

A) True 
 B)False

Question 7

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CoSO4(aq)  + (NH4) 3PO4(aq)   →\rightarrow→

Accepted Answer

A)   cobalt(II)  phosphate, Co3(PO4) 2
B)   cobalt(III)  phosphate, Co3(PO4) 2
C)   cobalt(II)  phosphate, CoPO4
D)   cobalt(III)  phosphate, CoPO4
E)   ammonium sulfate, (NH4) 2SO4

Question 8

Which one of the following ionic compounds is soluble in water?

Accepted Answer

A)   Na2S
B)   PbI2
C)   AgCl
D)   CuS
E)   Ca3(PO4) 2

Question 9

A particular reaction may be both a precipitation and an acid-base (neutralization) reaction.

Accepted Answer

A) True 
 B)False

Question 10

The compound P4O10 is used in refining sugar. Select the classification for the reaction in which it is synthesized. P4(s)  + 5O2(g)   →\rightarrow→ P4O10(s)

Accepted Answer

A)   combination
B)   decomposition
C)   displacement
D)   acid-base
E)   precipitation

Question 11

In both of the following reactions, a precipitate is formed. Complete and balance the equations, showing the phases of the products. 
a. $ \mathrm{BaCl}_{2}(\alpha q)+\mathrm{Na}_{2} \mathrm{SO}_{4}(\alpha q) \rightarrow $
b. $ \mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}(a q)+\mathrm{KOH}\left(a_{1}\right) \rightarrow $

Accepted Answer

The answer of In both of the following reactions, a...

Question 12

An acid

Accepted Answer

A)   produces hydroxide ions when dissolved in water.
B)   changes the color of phenolphthalein indicator from colorless to pink.
C)   donates electrons in an electron transfer reaction.
D)   donates protons in a proton transfer reaction.
E)   does none of these choices.

Question 13

Calculate the oxidation number of the chlorine in perchloric acid, HClO4, a strong oxidizing agent.

Accepted Answer

A)   -1
B)   +4
C)   +5
D)   +7
E)   None of these choices is correct.

Question 14

Predict the product(s)  for the following reaction: 4(aq)  B)  H2ClO4(aq)  C)  H(ClO4) 2(aq)  D)  HCl(aq)  + O2(g)  E)  HClO3(aq) " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   HClO4(aq) 
B)   H2ClO4(aq) 
C)   H(ClO4) 2(aq) 
D)   HCl(aq)  + O2(g) 
E)   HClO3(aq)

Question 15

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq)  + HBr(aq)   →\rightarrow→ H2O(l)  + LiBr(aq)

Accepted Answer

A)   LiOH(aq)  →\rightarrow→ Li+(aq)  + OH¯(aq) 
B)   HBr(aq)   →\rightarrow→ H+(aq)  + Br¯(aq) 
C)   H+(aq)  + OH¯(aq)   →\rightarrow→ H2O(l) 
D)   Li+(aq)  + Br¯(aq)   →\rightarrow→  LiBr(aq) 
E)   Li+(aq)  + OH¯(aq)  + H+(aq)  + Br¯(aq)   →\rightarrow→  H2O(l)  + LiBr(aq)

Question 16

Select the classification for the following reaction: Fe(s)  + 2Fe3+(aq)   →\rightarrow→ 3Fe2+(aq)

Accepted Answer

A)   precipitation
B)   acid-base
C)   redox
D)   decomposition
E)   None of these choices is correct.

Question 17

Which one of the following substances, when dissolved in water at equal molar concentrations, will give the solution with the lowest electrical conductivity?

Accepted Answer

A)   CaCl2
B)   HNO3
C)   NH3
D)   C6H12O6 (glucose) 
E)   CO2

Question 18

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)   CuSO4

Question 19

Which one of the following is not a redox reaction?

Accepted Answer

A)   2H2(g)  + O2(g)   →\rightarrow→  2H2O(l) 
B)   Zn(s)  + H2SO4(aq)   →\rightarrow→  ZnSO4(aq)  + H2(g) 
C)   H2O(l)  + NH3(g)   →\rightarrow→ NH4+(aq)  + OH¯(aq) 
D)   6FeSO4(aq)  + K2Cr2O7(aq) + 7H2SO4(aq)   →\rightarrow→ Cr2(SO4) 3(aq)  + 3Fe2(SO4) 3(aq) + K2SO4(aq)  + 7H2O(l) 
E)   Cl2(g)  + 2KBr(aq)   →\rightarrow→  Br2(l)  + 2KCl(aq)

Question 20

In a redox reaction, electrons are transferred

Accepted Answer

A)   from the substance being oxidized to the reducing agent.
B)   from the oxidizing agent to the reducing agent.
C)   from the substance being reduced to the oxidizing agent.
D)   from the substance being oxidized to the substance being reduced.
E)   from the substance being reduced to the substance being oxidized.

Exam 4: Three Major Classes of Chemical Reactions

Correct Answer
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Which one of the following ionic compounds is soluble in water?

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

Correct Answer
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Calculate the oxidation number of sulfur in sodium metabisulfite, Na₂S₂O₅.

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

Correct Answer
verified

Predict the product(s) for the following reaction:

Correct Answer
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The compound P₄O₁₀ is used in refining sugar. Select the classification for the reaction in which it is synthesized. P₄(s) + 5O₂(g) $\rightarrow$ P₄O₁₀(s)

Correct Answer
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Calculate the oxidation number of the chlorine in perchloric acid, HClO₄, a strong oxidizing agent.

Correct Answer
verified

An acid

Correct Answer
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Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq) + HBr(aq) $\rightarrow$ H₂O(l) + LiBr(aq)

Correct Answer
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In a redox reaction, electrons are transferred

Correct Answer
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Which one of the following is not a redox reaction?

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

Correct Answer
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All combustion reactions are classified as combination reactions.

Correct Answer
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Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CoSO₄(aq) + (NH₄) ₃PO₄(aq) $\rightarrow$

Correct Answer
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Select the classification for the following reaction: Fe(s) + 2Fe³⁺(aq) $\rightarrow$ 3Fe²⁺(aq)

Correct Answer
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Which one of the following substances, when dissolved in water at equal molar concentrations, will give the solution with the lowest electrical conductivity?

Correct Answer
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Select the best statement relating to the following reaction: 2MnO₂(s) + KClO₃(aq) + 2KOH(aq) $\rightarrow$ 2KMnO₄(aq) + KCl(aq) + H₂O(l)

Correct Answer
verified

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

Correct Answer
verified

A particular reaction may be both a precipitation and an acid-base (neutralization) reaction.

Correct Answer
verified

Exam 4: Three Major Classes of Chemical Reactions

Correct AnswerverifiedShow Answer

Which one of the following ionic compounds is soluble in water?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Calculate the oxidation number of sulfur in sodium metabisulfite, Na2S2O5.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Predict the product(s) for the following reaction:

Correct AnswerverifiedShow Answer

The compound P4O10 is used in refining sugar. Select the classification for the reaction in which it is synthesized. P4(s) + 5O2(g) →\rightarrow→ P4O10(s)

Correct AnswerverifiedShow Answer

Calculate the oxidation number of the chlorine in perchloric acid, HClO4, a strong oxidizing agent.

Correct AnswerverifiedShow Answer

An acid

Correct AnswerverifiedShow Answer

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq) + HBr(aq) →\rightarrow→ H2O(l) + LiBr(aq)

Correct AnswerverifiedShow Answer

In a redox reaction, electrons are transferred

Correct AnswerverifiedShow Answer

Which one of the following is not a redox reaction?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

All combustion reactions are classified as combination reactions.

Correct AnswerverifiedShow Answer

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CoSO4(aq) + (NH4) 3PO4(aq) →\rightarrow→

Correct AnswerverifiedShow Answer

Select the classification for the following reaction: Fe(s) + 2Fe3+(aq) →\rightarrow→ 3Fe2+(aq)

Correct AnswerverifiedShow Answer

Which one of the following substances, when dissolved in water at equal molar concentrations, will give the solution with the lowest electrical conductivity?

Correct AnswerverifiedShow Answer

Select the best statement relating to the following reaction: 2MnO2(s) + KClO3(aq) + 2KOH(aq) →\rightarrow→ 2KMnO4(aq) + KCl(aq) + H2O(l)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A particular reaction may be both a precipitation and an acid-base (neutralization) reaction.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Calculate the oxidation number of sulfur in sodium metabisulfite, Na₂S₂O₅.

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

The compound P₄O₁₀ is used in refining sugar. Select the classification for the reaction in which it is synthesized. P₄(s) + 5O₂(g) $\rightarrow$ P₄O₁₀(s)

Correct Answer
verified

Calculate the oxidation number of the chlorine in perchloric acid, HClO₄, a strong oxidizing agent.

Correct Answer
verified

Correct Answer
verified

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq) + HBr(aq) $\rightarrow$ H₂O(l) + LiBr(aq)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CoSO₄(aq) + (NH₄) ₃PO₄(aq) $\rightarrow$

Correct Answer
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Select the classification for the following reaction: Fe(s) + 2Fe³⁺(aq) $\rightarrow$ 3Fe²⁺(aq)

Correct Answer
verified

Correct Answer
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Select the best statement relating to the following reaction: 2MnO₂(s) + KClO₃(aq) + 2KOH(aq) $\rightarrow$ 2KMnO₄(aq) + KCl(aq) + H₂O(l)

Correct Answer
verified

Correct Answer
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Correct Answer
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