Question 1

Select the classification for the following reaction. 2Ag+(aq)  + Zn(s)  → 2Ag(s)  + Zn2+(aq)

Accepted Answer

A)  Displacement
B)  Decomposition
C)  Combination
D)  Precipitation
E)  Acid-baseF) A) and E)
G) A) and C)

Question 2

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.F) B) and C)
G) A) and B)

Question 3

What will be the final volume of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?

Accepted Answer

A)  330 mL
B)  210 mL
C)  86 mL
D)  60 mL
E)  7.3 mLF) C) and D)
G) A) and B)

Question 4

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 are correct.F) A) and D)
G) C) and E)

Question 5

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

Accepted Answer

A)  Precipitation
B)  Acid-base
C)  Redox
D)  Decomposition
E)  None of these choices are correct.F) A) and C)
G) C) and D)

Question 6

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

Accepted Answer

A)  1.66 × 10 23 sodium ions
B)  3.33 × 10 23 sodium ions
C)  4.99 × 10 23 sodium ions
D)  6.20 × 10 23 sodium ions
E)  1.57 × 10 24 sodium ionsF) A) and B)
G) A) and C)

Question 7

All combustion reactions are classified as combination reactions.

Accepted Answer

A) True 
 B)False

Question 8

Which one of the following substances is a strong acid?

Accepted Answer

A)  HNO 3
B)  H 2CO 3
C)  NH 3
D)  CH 3COOH
E)  H 3PO 4F) B) and E)
G) None of the above

Question 9

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

Accepted Answer

A)  Combination
B)  Decomposition
C)  Displacement
D)  Acid-base
E)  PrecipitationF) A) and B)
G) None of the above

Question 10

Which of the statements below correctly describes the combustion of glucose, shown below? C6H12O6 + 6O2 → 6CO2 + 6H2O

Accepted Answer

A)  Hydrogen in C 6H 12O 6 is being reduced.
B)  Oxygen in O 2 is being oxidized.
C)  Hydrogen in C 6H 12O 6 is the reducing agent.
D)  Oxygen in C 6H 12O 6 is the oxidizing agent.
E)  Carbon in C 6H 12O 6 is being oxidized.F) C) and D)
G) A) and B)

Question 11

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

Accepted Answer

A)  Na +( aq) + NO 3 −( aq) → NaNO 3( aq) 
B)  Hg 2 2+( aq) + 2Cl −( aq) → Hg 2Cl 2(s) 
C)  NaCl( aq) → Na +( aq) + Cl −( aq) 
D)  Hg 2(NO 3) 2( aq) → Hg 2 2+( aq) + 2NO 3 −( aq) 
E)  Hg 2 2+( aq) → Hg 2( s) F) C) and E)
G) D) and E)

Question 12

Select the classification for the following reaction. 2I−(aq)  + Cl2(aq)  → I2(aq)  + 2Cl −(aq)

Accepted Answer

A)  Combination
B)  Displacement
C)  Decomposition
D)  Precipitation
E)  Acid-baseF) A) and B)
G) A) and C)

Question 13

Which one of the following substances is the best electrolyte?

Accepted Answer

A)  CO
B)  CH 3Cl
C)  CH 4
D)  C 2H 5OH
E)  HClF) C) and E)
G) B) and C)

Question 14

Oxidation is associated with an increase in oxidation number.

Accepted Answer

A) True 
 B)False

Question 15

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)  None of these choices are correct.F) A) and B)
G) B) and E)

Question 16

A combination reaction may also be a displacement reaction.

Accepted Answer

A) True 
 B)False

Question 17

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

Accepted Answer

A)  Combination
B)  Decomposition
C)  Displacement
D)  Acid-base
E)  None of these choices are correct.F) None of the above
G) A) and B)

Question 18

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

Accepted Answer

A)  Methyl alcohol, CH 3OH( aq) 
B)  Glucose, C 6H 12O 6( aq) 
C)  Potassium chloride, KCl( aq) 
D)  Bromine, Br 2( aq) 
E)  Ethylene glycol, C 2H 6O 2( aq) F) B) and C)
G) D) and E)

Question 19

Covalent compounds, dissolved in water, never produce conducting solutions.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A)  Pb 2+( aq) , Cl −( aq) 
B)  Na +( aq) , NO 3 −( aq) 
C)  Pb 2+( aq) , NO 3 −( aq) 
D)  Na +( aq) , Cl −( aq) 
E)  There are no spectator ions.F) B) and C)
G) A) and E)

Exam 4: Three Major Classes of Chemical Reactions

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

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

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Select the classification for the following reaction. 2Ag+(aq) + Zn(s) → 2Ag(s) + Zn2+(aq)

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

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

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In a redox reaction, electrons are transferred

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What will be the final volume of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?

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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) → 2NaNO3(aq) + Hg2Cl2(s)

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Select the classification for the following reaction. 2I−(aq) + Cl2(aq) → I2(aq) + 2Cl −(aq)

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A combination reaction may also be a displacement reaction.

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Which of the statements below correctly describes the combustion of glucose, shown below? C6H12O6 + 6O2 → 6CO2 + 6H2O

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Oxidation is associated with an increase in oxidation number.

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All combustion reactions are classified as combination reactions.

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Which one of the following substances is the best electrolyte?

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Which one of the following substances is a strong acid?

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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) → P4O10(s)

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A base

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Covalent compounds, dissolved in water, never produce conducting solutions.

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

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

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

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

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Select the classification for the following reaction. 2Ag⁺(aq) + Zn(s) → 2Ag(s) + Zn²⁺(aq)

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

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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) → 2NaNO₃(aq) + Hg₂Cl₂(s)

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Select the classification for the following reaction. 2I⁻(aq) + Cl₂(aq) → I₂(aq) + 2Cl ⁻(aq)

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Which of the statements below correctly describes the combustion of glucose, shown below? C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

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The compound P₄O₁₀is used in refining sugar. Select the classification for the reaction in which it is synthesized. P₄(s) + 5O₂(g) → P₄O₁₀(s)

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

Correct Answer
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Select the classification for the following reaction. Fe(s) + 2Fe³⁺(aq) → 3Fe²⁺(aq)

Correct Answer
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