Question 1

Which of the following equations is not balanced?

Accepted Answer

A)  C7H16 + O2 → 7 CO2 + 8 H2O
B)  K2CrO4 + Pb(NO3) 2 → 2 KNO3 + PbCrO4
C)  4 Fe3O4 + O2 → 6 Fe2O3
D)  3 AgNO3 + (NH4) 3PO4 → Ag3PO4 + 3 NH4NO3
E)  2 Al2O3 → 4 Al + 3 O2F) A) and B)
G) A) and C)

Question 2

In a chemical reaction

Accepted Answer

A)  there are equal numbers of atoms on each side of the reaction arrow.
B)  there are equal numbers of molecules on each side of the reaction arrow.
C)  there are always the same number of products as there are reactants.
D)  the number of atoms present in a reaction can vary when the conditions change during the reaction.
E)  none of the aboveF) A) and B)
G) A) and C)

Question 3

Consider the reaction shown and identify the statement that is not true.
CaCO3 (s)  3 (s)    CaO (s) + CO2 (g)  A) This reaction is balanced as written. B) The reactant must be heated for this reaction to occur. C) The products are a solid and a gas. D) Water must be present for this reaction to occur. E) There are no solutions used in this reaction." class="answers-bank-image d-inline" rel="preload" >
CaO (s) + CO2 (g)

Accepted Answer

A)  This reaction is balanced as written.
B)  The reactant must be heated for this reaction to occur.
C)  The products are a solid and a gas.
D)  Water must be present for this reaction to occur.
E)  There are no solutions used in this reaction.F) A) and D)
G) A) and E)

Question 4

What are the spectator ions in the reaction between KOH and HNO3?

Accepted Answer

A)  K+ and H+
B)  H+ and OH-
C)  K+ and NO3-
D)  H+and NO3-E) A) and B)
F) A) and C)

Question 5

The combination of ions most likely to produce a precipitate is

Accepted Answer

A)  Li+ and PO43-.
B)  Pb2+ and NO3-.
C)  NH4+ and SO42-.
D)  Fe3+ and OH-.
E)  Mg2+ and C2H3O2-.F) A) and D)
G) A) and C)

Question 6

When the reaction shown is correctly balanced,the coefficients are:
KClO3 → KCl + O2

Accepted Answer

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

Question 7

In the following reaction which species is being oxidized and which is being reduced?
2 Cr (s) + 3 Cl2 (g) → 2 CrCl3 (s)

Accepted Answer

A)  oxidized: Cr; reduced: CrCl3
B)  oxidized:CrCl3; reduced: Cr
C)  oxidized: Cr; reduced: Cl2
D)  oxidized: Cl2; reduced: CrE) B) and D)
F) None of the above

Question 8

Reduction is the process of

Accepted Answer

A)  gaining hydrogen.
B)  losing oxygen.
C)  gaining electrons.
D)  forming an anion from a neutral atom.
E)  all of the aboveF) A) and D)
G) A) and E)

Question 9

When the reaction shown is correctly balanced,the coefficients are:
C6H14 (l) + O2 (g) → CO2 (g) + H2O (g)

Accepted Answer

A)  1,6,6,7
B)  2,19,12,14
C)  1,3.5,6,7
D)  1,9.5,6,7
E)  2,16.5,12,7F) A) and B)
G) A) and E)

Question 10

The combination of ions least likely to produce a precipitate is

Accepted Answer

A)  Ba2+ and SO42-.
B)  Pb+ and Cl-.
C)  Ca2+ and PO43-.
D)  Fe3+ and OH-.
E)  Mg2+ and C2H3O2-.F) A) and E)
G) D) and E)

Question 11

All of the statements regarding redox reactions are true except

Accepted Answer

A)  a reducing agent causes another substance to be reduced.
B)  halogens usually behave as oxidizing agents because they readily gain electrons.
C)  metal ions are produced when pure metals are oxidized.
D)  when a substance is oxidized its charge (or oxidation number) decreases.
E)  alkali metals often behave as reducing agents because they readily lose electrons.F) None of the above
G) A) and B)

Question 12

Which reaction is not an example of a redox reaction?

Accepted Answer

A)  2 Hg (l) + O2 (g) → 2 HgO (s) 
B)  2 (NH4) 3PO4 (aq) + 3 Ba(NO3) 2 (aq) → Ba3(PO4) 2 (s) + 6 NH4NO3 (aq) 
C)  CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (g) 
D)  6 HCl (aq) + 2 Al (s) → 2 AlCl3 (aq) + 3 H2 (g) 
E)  2 Al2O3 (s) → 4 Al (s) + 3 O2 (g) F) C) and E)
G) A) and B)

Question 13

The scientific principle which is the basis for balancing chemical equations is

Accepted Answer

A)  the Law of Conservation of Energy.
B)  the Law of Conservation of Mass.
C)  the Law of Conservation of Mass and Energy.
D)  the Law of Definite Proportions.
E)  Avogadro's Law.F) C) and E)
G) B) and C)

Question 14

The formation of which one of the compounds below will act as the driving force for an acid-base reaction?

Accepted Answer

A)  H2O
B)  MgCl2
C)  NaNO3
D)  KOHE) B) and D)
F) B) and C)

Question 15

2 AgNO3 (aq) + K2SO4(aq) → 2 KNO3 (aq) + Ag2SO4s) 
The net ionic reaction for the balanced equation shown above is

Accepted Answer

A)  Ag+ +3 (aq) + K2SO4(aq) → 2 KNO3 (aq) + Ag2SO4s)  The net ionic reaction for the balanced equation shown above is 
A)  Ag+ +   → AgNO3. 
B)  2 K+ +   → K2SO4. 
C)  K+ +   → KNO3. 
D)  2 Ag+ +   → Ag2SO4. 
E)  H+ + OH- → H2O." class="answers-bank-image d-inline" rel="preload" >→ AgNO3.
B)  2 K+ +3 (aq) + K2SO4(aq) → 2 KNO3 (aq) + Ag2SO4s)  The net ionic reaction for the balanced equation shown above is 
A)  Ag+ +   → AgNO3. 
B)  2 K+ +   → K2SO4. 
C)  K+ +   → KNO3. 
D)  2 Ag+ +   → Ag2SO4. 
E)  H+ + OH- → H2O." class="answers-bank-image d-inline" rel="preload" >→ K2SO4.
C)  K+ +3 (aq) + K2SO4(aq) → 2 KNO3 (aq) + Ag2SO4s)  The net ionic reaction for the balanced equation shown above is 
A)  Ag+ +   → AgNO3. 
B)  2 K+ +   → K2SO4. 
C)  K+ +   → KNO3. 
D)  2 Ag+ +   → Ag2SO4. 
E)  H+ + OH- → H2O." class="answers-bank-image d-inline" rel="preload" >→ KNO3.
D)  2 Ag+ +3 (aq) + K2SO4(aq) → 2 KNO3 (aq) + Ag2SO4s)  The net ionic reaction for the balanced equation shown above is 
A)  Ag+ +   → AgNO3. 
B)  2 K+ +   → K2SO4. 
C)  K+ +   → KNO3. 
D)  2 Ag+ +   → Ag2SO4. 
E)  H+ + OH- → H2O." class="answers-bank-image d-inline" rel="preload" >→ Ag2SO4.
E)  H+ + OH- → H2O.F) B) and D)
G) C) and E)

Question 16

When the reaction shown is correctly balanced,the coefficients are:
____ HBr + ____ Ca(OH) 2 → ____ CaBr2 + ____ H2O

Accepted Answer

A)  2,1,1,1
B)  1,1,1,2
C)  2,1,1,2
D)  2,2,1,1
E)  2,1,2,2F) C) and D)
G) None of the above

Question 17

Which of the following is always a spectator ion in a chemical reaction?

Accepted Answer

A)  Na+
B)  Cl-
C)  S2-
D)  Mg2+
E)  All of these ions.F) A) and C)
G) A) and B)

Question 18

Match the following.
-HR (aq) + XOH (aq) → XR (aq) + H2O (l)

Accepted Answer

A)  redox
B)  acid-base
C)  precipitationD) B) and C)
E) All of the above

Question 19

Match the following.
-LX (aq) + MY (aq) → LY (s) + MX (aq)

Accepted Answer

A)  redox
B)  acid-base
C)  precipitationD) All of the above
E) None of the above

Question 20

The following reaction can be classified as what type(s) of reaction(s) ?
2 Al(OH) 3 (aq) + 3 H2SO4 (aq) → Al2(SO4) 3 (s) + 6 H2O (l)

Accepted Answer

A)  precipitation
B)  acid-base neutralization
C)  redox reaction
D)  both A and BE) C) and D)
F) All of the above

Exam 5: Classification and Balancing of Chemical Reactions

The formation of which one of the compounds below will act as the driving force for an acid-base reaction?

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When the reaction shown is correctly balanced,the coefficients are: KClO3 → KCl + O2

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In a chemical reaction

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In the following reaction which species is being oxidized and which is being reduced? 2 Cr (s) + 3 Cl2 (g) → 2 CrCl3 (s)

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Reduction is the process of

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When the reaction shown is correctly balanced,the coefficients are: ____ HBr + ____ Ca(OH) 2 → ____ CaBr2 + ____ H2O

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When the reaction shown is correctly balanced,the coefficients are: C6H14 (l) + O2 (g) → CO2 (g) + H2O (g)

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Consider the reaction shown and identify the statement that is not true. CaCO3 (s) CaO (s) + CO2 (g)

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Match the following. -LX (aq) + MY (aq) → LY (s) + MX (aq)

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What are the spectator ions in the reaction between KOH and HNO3?

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The combination of ions least likely to produce a precipitate is

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2 AgNO3 (aq) + K2SO4(aq) → 2 KNO3 (aq) + Ag2SO4s) The net ionic reaction for the balanced equation shown above is

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The following reaction can be classified as what type(s) of reaction(s) ? 2 Al(OH) 3 (aq) + 3 H2SO4 (aq) → Al2(SO4) 3 (s) + 6 H2O (l)

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Which of the following is always a spectator ion in a chemical reaction?

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Match the following. -HR (aq) + XOH (aq) → XR (aq) + H2O (l)

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Which reaction is not an example of a redox reaction?

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The scientific principle which is the basis for balancing chemical equations is

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All of the statements regarding redox reactions are true except

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Which of the following equations is not balanced?

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The combination of ions most likely to produce a precipitate is

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When the reaction shown is correctly balanced,the coefficients are: KClO₃ → KCl + O₂

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In the following reaction which species is being oxidized and which is being reduced? 2 Cr (s) + 3 Cl₂ (g) → 2 CrCl₃ (s)

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When the reaction shown is correctly balanced,the coefficients are: HBr + Ca(OH) ₂ → CaBr₂ + H₂O

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When the reaction shown is correctly balanced,the coefficients are: C₆H₁₄ (l) + O₂ (g) → CO₂ (g) + H₂O (g)

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Consider the reaction shown and identify the statement that is not true. CaCO₃ (s) CaO (s) + CO₂ (g)

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What are the spectator ions in the reaction between KOH and HNO₃?

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2 AgNO₃ (aq) + K₂SO₄(aq) → 2 KNO₃ (aq) + Ag₂SO₄s) The net ionic reaction for the balanced equation shown above is

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The following reaction can be classified as what type(s) of reaction(s) ? 2 Al(OH) ₃ (aq) + 3 H₂SO₄ (aq) → Al₂(SO₄) ₃ (s) + 6 H₂O (l)

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Match the following. -HR (aq) + XOH (aq) → XR (aq) + H₂O (l)

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