Question 1

A base

Accepted Answer

A)   causes phenolphthalein indicator to change from colorless to pink.
B)   donates a proton in a proton transfer reaction.
C)   accepts electrons in an electron transfer reaction.
D)   produces hydrogen ions in solution.
E)   does none of these choices.F) A) and B)
G) A) and E)

Question 2

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)   →\rightarrow→ 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 B)
G) B) and D)

Question 3

In the following reaction, what ions, if any, are spectator ions? Pb(NO3) 2(aq)  + 2NaCl(aq)   →\rightarrow→ PbCl2(s)  + 2NaNO3(aq)

Accepted Answer

A)   Pb2+(aq) , Cl¯(aq) 
B)   Na+(aq) , NO3¯(aq) 
C)   Pb2+(aq) , NO3¯(aq) 
D)   Na+(aq) , Cl¯(aq) 
E)   There are no spectator ions in this reaction. F) A) and D)
G) All of the above

Question 4

An aqueous solution of lead nitrate, Pb(NO3)2, is mixed with one of sodium chromate, Na2CrO4, resulting in the formation of a precipitate of lead chromate. Write a balanced net ionic equation for this precipitation reaction, showing all phases.

Accepted Answer

Question 5

Automobile batteries use 3.0 M H2SO4 as an electrolyte. How much 1.20 M NaOH will be needed to neutralize 225 mL of battery acid? H2SO4(aq)  + 2NaOH(aq)   →\rightarrow→ 2H2O(l)  + Na2SO4(aq)

Accepted Answer

A)   0.045 L
B)   0.28 L
C)   0.56 L
D)   0.90 L
E)   1.1 L F) C) and D)
G) All of the above

Question 6

Potassium chloride, KCl, sodium sulfate, Na2SO4, glucose, C6H12O6, carbon dioxide, CO2 and ammonium phosphate, (NH4) 3PO4, are soluble in water. Which one produces the largest number of dissolved particles per mole of dissolved solute?

Accepted Answer

A)   KCl
B)   Na2SO4
C)   C6H12O6
D)   CO2
E)   (NH4) 3PO4F) D) and E)
G) A) and C)

Question 7

Select the classification for the following reaction: Na2O(s)  + H2O(l)   →\rightarrow→  2NaOH(aq)

Accepted Answer

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

Question 8

Select the classification for the following reaction:

Accepted Answer

A)   acid-base
B)   precipitation
C)   combination
D)   displacement
E)   decompositionF) A) and C)
G) A) and B)

Question 9

What, if any, are the spectator ions when aqueous solutions of HBr and RbOH neutralize each other?

Accepted Answer

A)   H+ and OH¯
B)   H+ and Rb+
C)   Rb+ and Br¯
D)   Br¯ and OH¯
E)   There are no spectator ions in this reaction.F) B) and E)
G) C) and D)

Question 10

Balance the following redox equation using the smallest integers possible and select the correct coefficient for the bromide anion, Br¯. Br2(aq)  + OH¯(aq)   →\rightarrow→ Br¯(aq)  + BrO3¯(aq)  + H2O(l)

Accepted Answer

A)   1
B)   2
C)   5
D)   6
E)   10 F) None of the above
G) B) and C)

Question 11

Select the classification for the following reaction: 2H2O2(aq)   →\rightarrow→  2H2O(l)  + O2(g)

Accepted Answer

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

Question 12

Balance the following redox equation using the smallest integers possible and select the correct coefficient for the iron(II)  hydroxide, Fe(OH) 2. Fe(OH) 2(s)  + CrO42¯(aq)   →\rightarrow→ Fe2O3(s)  + Cr(OH) 4¯(aq)  + H2O(l)  + OH¯(aq)

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   6 F) A) and B)
G) A) and C)

Question 13

Which one of the following is a redox reaction?

Accepted Answer

A)   2Na(g)  + Cl2(g)   →\rightarrow→  2NaCl(s) 
B)   Ba2+(aq)  + SO42¯(aq)   →\rightarrow→  BaSO4(s) 
C)   K2Cr2O7(aq)  + 2KOH(aq)   →\rightarrow→ 2K2CrO4(aq)  + H2O(l) 
D)   Na2CO3(s)  + 2HCl(aq)   →\rightarrow→  2NaCl(aq)  + CO2(g)  + H2O(l) 
E)   H2O(l)   →\rightarrow→ H+(aq)  + OH¯(aq)  F) C) and E)
G) B) and D)

Question 14

A) Explain or define what is meant by the term "oxidation."
B) Write down the oxidation numbers of all the atoms in the formulas K2Cr2O7 and NaH.

Accepted Answer

a. Oxidation: loss of electron...

Question 15

In an acid-base (neutralization) reaction the indicator will change color at the end point.

Accepted Answer

A) True 
 B)False

Question 16

Predict the product(s)  for the following reaction: 2(s)  + CO(g)  B)  MgO(s)  + CO2 C)  Mg(s)  + CO2(g)  + O2(g)  D)  Mg2+(s)  + CO2(g)  + O2(g)  E)  No reaction occurs." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   MgO2(s)  + CO(g) 
B)   MgO(s)  + CO2
C)   Mg(s)  + CO2(g)  + O2(g) 
D)   Mg2+(s)  + CO2(g)  + O2(g) 
E)   No reaction occurs.F) A) and B)
G) All of the above

Question 17

Select the classification for the following reaction: KOH(aq)  + HCl(aq)   →\rightarrow→  KCl(aq)  + H2O(l)

Accepted Answer

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

Question 18

All acid-base reactions produce a salt and water as the only products.

Accepted Answer

A) True 
 B)False

Question 19

Reduction is the loss of electrons.

Accepted Answer

A) True 
 B)False

Question 20

Select the classification for the following reaction: BaCl2(aq)  + K2SO4(aq)   →\rightarrow→  BaSO4(s)  + 2KCl(aq)

Accepted Answer

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

Exam 4: Three Major Classes of Chemical Reactions

Balance the following redox equation using the smallest integers possible and select the correct coefficient for the bromide anion, Br¯. Br2(aq) + OH¯(aq) →\rightarrow→ Br¯(aq) + BrO3¯(aq) + H2O(l)

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In an acid-base (neutralization) reaction the indicator will change color at the end point.

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Select the classification for the following reaction: KOH(aq) + HCl(aq) →\rightarrow→ KCl(aq) + H2O(l)

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Potassium chloride, KCl, sodium sulfate, Na2SO4, glucose, C6H12O6, carbon dioxide, CO2 and ammonium phosphate, (NH4) 3PO4, are soluble in water. Which one produces the largest number of dissolved particles per mole of dissolved solute?

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A base

Correct AnswerverifiedShow Answer

Select the classification for the following reaction: 2H2O2(aq) →\rightarrow→ 2H2O(l) + O2(g)

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An aqueous solution of lead nitrate, Pb(NO3)2, is mixed with one of sodium chromate, Na2CrO4, resulting in the formation of a precipitate of lead chromate. Write a balanced net ionic equation for this precipitation reaction, showing all phases.

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Select the classification for the following reaction: BaCl2(aq) + K2SO4(aq) →\rightarrow→ BaSO4(s) + 2KCl(aq)

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Predict the product(s) for the following reaction:

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A) Explain or define what is meant by the term "oxidation." B) Write down the oxidation numbers of all the atoms in the formulas K2Cr2O7 and NaH.

Correct Answerverifieda. Oxidation: loss of electron...View AnswerShow Answer

Select the classification for the following reaction: Na2O(s) + H2O(l) →\rightarrow→ 2NaOH(aq)

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Automobile batteries use 3.0 M H2SO4 as an electrolyte. How much 1.20 M NaOH will be needed to neutralize 225 mL of battery acid? H2SO4(aq) + 2NaOH(aq) →\rightarrow→ 2H2O(l) + Na2SO4(aq)

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Which one of the following is a redox reaction?

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In the following reaction, what ions, if any, are spectator ions? Pb(NO3) 2(aq) + 2NaCl(aq) →\rightarrow→ PbCl2(s) + 2NaNO3(aq)

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What, if any, are the spectator ions when aqueous solutions of HBr and RbOH neutralize each other?

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Reduction is the loss of electrons.

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Select the classification for the following reaction:

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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) →\rightarrow→ S4O62¯(aq) + 2I¯(aq)

Correct AnswerverifiedShow Answer

Balance the following redox equation using the smallest integers possible and select the correct coefficient for the iron(II) hydroxide, Fe(OH) 2. Fe(OH) 2(s) + CrO42¯(aq) →\rightarrow→ Fe2O3(s) + Cr(OH) 4¯(aq) + H2O(l) + OH¯(aq)

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All acid-base reactions produce a salt and water as the only products.

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Balance the following redox equation using the smallest integers possible and select the correct coefficient for the bromide anion, Br^¯. Br₂(aq) + OH^¯(aq) $\rightarrow$ Br^¯(aq) + BrO₃^¯(aq) + H₂O(l)

Correct Answer
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Correct Answer
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Select the classification for the following reaction: KOH(aq) + HCl(aq) $\rightarrow$ KCl(aq) + H₂O(l)

Correct Answer
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Potassium chloride, KCl, sodium sulfate, Na₂SO₄, glucose, C₆H₁₂O₆, carbon dioxide, CO₂ and ammonium phosphate, (NH₄) ₃PO₄, are soluble in water. Which one produces the largest number of dissolved particles per mole of dissolved solute?

Correct Answer
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Correct Answer
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Select the classification for the following reaction: 2H₂O₂(aq) $\rightarrow$ 2H₂O(l) + O₂(g)

Correct Answer
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An aqueous solution of lead nitrate, Pb(NO₃)₂, is mixed with one of sodium chromate, Na₂CrO₄, resulting in the formation of a precipitate of lead chromate. Write a balanced net ionic equation for this precipitation reaction, showing all phases.

Correct Answer
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Select the classification for the following reaction: BaCl₂(aq) + K₂SO₄(aq) $\rightarrow$ BaSO₄(s) + 2KCl(aq)

Correct Answer
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Correct Answer
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A) Explain or define what is meant by the term "oxidation." B) Write down the oxidation numbers of all the atoms in the formulas K₂Cr₂O₇ and NaH.

Correct Answer
verified
a. Oxidation: loss of electron...
View Answer

Select the classification for the following reaction: Na₂O(s) + H₂O(l) $\rightarrow$ 2NaOH(aq)

Correct Answer
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Automobile batteries use 3.0 M H₂SO₄ as an electrolyte. How much 1.20 M NaOH will be needed to neutralize 225 mL of battery acid? H₂SO₄(aq) + 2NaOH(aq) $\rightarrow$ 2H₂O(l) + Na₂SO₄(aq)

Correct Answer
verified

Correct Answer
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In the following reaction, what ions, if any, are spectator ions? Pb(NO₃) ₂(aq) + 2NaCl(aq) $\rightarrow$ PbCl₂(s) + 2NaNO₃(aq)

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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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. 2S₂O₃^2¯(aq) + I₂(aq) $\rightarrow$ S₄O₆^2¯(aq) + 2I^¯(aq)

Correct Answer
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Balance the following redox equation using the smallest integers possible and select the correct coefficient for the iron(II) hydroxide, Fe(OH) ₂. Fe(OH) ₂(s) + CrO₄^2¯(aq) $\rightarrow$ Fe₂O₃(s) + Cr(OH) ₄^¯(aq) + H₂O(l) + OH^¯(aq)

Correct Answer
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Correct Answer
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