Question 1

Which balanced chemical equation could represent the following result of a precipitation reaction?

Accepted Answer

A) 2K3PO4(aq) + 3Cr2(SO4)3(aq) → CrPO4(s) + 6KCl(aq) 
B) MgSO4(aq) + 2AgNO3(aq) → Ag2SO4(s) + Mg(NO3)2(aq) 
C) MgCl2(aq) + 2AgC2H3O2(aq) → 2AgCl(s) + Mg(C2H3O2)2(aq) 
D) K2CrO4(aq) + 2AgNO3(aq) → Ag2CrO4(s) + 2KNO3(aq) 
E) K2S(aq) + Pb(NO3)2(aq) → PbS(s) + 2KNO3(aq) 
A) 2K3PO4(aq) + 3Cr2(SO4)3(aq) → CrPO4(s) + 6KCl(aq) 
B) MgSO4(aq) + 2AgNO3(aq) → Ag2SO4(s) + Mg(NO3)2(aq) 
C) MgCl2(aq) + 2AgC2H3O2(aq) → 2AgCl(s) + Mg(C2H3O2)2(aq) 
D) K2CrO4(aq) + 2AgNO3(aq) → Ag2CrO4(s) + 2KNO3(aq) 
E) K2S(aq) + Pb(NO3)2(aq) → PbS(s) + 2KNO3(aq) C

Question 2

Which chemical equation describes an acid-base neutralization reaction?

Accepted Answer

A) 2Al(s)+ 3H2SO4(aq) → Al2 (SO4)3 (aq) + 3H2(g) 
B) 2SO2(g) + 2H2O(l) + O2(g) → 2H2SO4(aq) 
C) LiOH(aq) + HNO3(aq) → LiNO3(aq) + H2O(l) 
D) 2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(l) 
E) CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(g) 
A) 2Al(s)+ 3H2SO4(aq) → Al2 (SO4)3 (aq) + 3H2(g) 
B) 2SO2(g) + 2H2O(l) + O2(g) → 2H2SO4(aq) 
C) LiOH(aq) + HNO3(aq) → LiNO3(aq) + H2O(l) 
D) 2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(l) 
E) CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(g) C

Question 3

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) __ SF4 + __ H2O → __ H2SO3 + __ HF

Accepted Answer

A) 4 
B) 6 
C) 7 
D) 9 
E) None of these answers is correct. 
A) 4 
B) 6 
C) 7 
D) 9 
E) None of these answers is correct. D

Question 4

When the following equation is balanced with smallest whole number integers, what is the coefficient for HNO3?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 5

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ PCl3(l) + ___ H2O(l) → ___ H3PO3(aq) + ___ HCl(aq)

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 5 
E) None of these answers is correct. 
A) 1 
B) 2 
C) 3 
D) 5 
E) None of these answers is correct.

Question 6

Which salt is produced by the neutralization of hydrobromic acid with magnesium hydroxide?

Accepted Answer

A) MgBr 
B) Mg2Br3 
C) MgBr2 
D) Mg3Br2 
E) Mg2Br 
A) MgBr 
B) Mg2Br3 
C) MgBr2 
D) Mg3Br2 
E) Mg2Br

Question 7

What is the coefficient of H2SO4 when the following equation is properly balanced with the smallest set of whole numbers? ___ Ca3(PO4)2 + ___ H2SO4 → ___ CaSO4 + ___ H3PO4

Accepted Answer

A) 3 
B) 8 
C) 10 
D) 11 
E) None of these answers is correct. 
A) 3 
B) 8 
C) 10 
D) 11 
E) None of these answers is correct.

Question 8

What is the net ionic equation for the reaction that occurs when aqueous solutions of Pb(NOS1U1B13S1U1B0)S1U1B12S1U1B0 and NHS1U1B14S1U1B0Cl are mixed?

Accepted Answer

A) Pb(NOS1U1B13S1U1B0)S1U1B12S1U1B0(aq) + 2NHS1U1B14S1U1B0Cl(aq) ? 2NHS1U1B14S1U1B0NOS1U1B13S1U1B0(aq) + PbClS1U1B12S1U1B0(s) 
B) PbS1U1B12S1U1B0S1U1P1+S1S1P0(aq) + 2ClS1U1P1?S1S1P0(aq) ? PbClS1U1B12S1U1B0(s) 
C) PbS1U1B12S1U1B0S1U1P1+S1S1P0(aq) + 2NOS1U1B13S1U1B0S1U1P1?S1S1P0(aq) + 2NHS1U1B14S1U1B0S1U1P1+S1S1P0(aq) + 2ClS1U1P1?S1S1P0(aq) ? 2NHS1U1B14S1U1B0S1U1P1+S1S1P0(aq) + 2NOS1U1B13S1U1B0S1U1P1?S1S1P0(aq) + PbClS1U1B12S1U1B0(s) 
D) NHS1U1B14S1U1B0S1U1P1+S1S1P0(aq) + NOS1U1B13S1U1B0S1U1P1?S1S1P0(aq) ? NHS1U1B14S1U1B0NOS1U1B13S1U1B0(s) 
E) NHS1U1B14S1U1B0S1U1P1+S1S1P0(aq) + NOS1U1B13S1U1B0S1U1P1?S1S1P0(aq) ? 2NO(g) + 2HS1U1B12S1U1B0O(l) 
A) Pb(NOS1U1B13S1U1B0)S1U1B12S1U1B0(aq) + 2NHS1U1B14S1U1B0Cl(aq) ? 2NHS1U1B14S1U1B0NOS1U1B13S1U1B0(aq) + PbClS1U1B12S1U1B0(s) 
B) PbS1U1B12S1U1B0S1U1P1+S1S1P0(aq) + 2ClS1U1P1?S1S1P0(aq) ? PbClS1U1B12S1U1B0(s) 
C) PbS1U1B12S1U1B0S1U1P1+S1S1P0(aq) + 2NOS1U1B13S1U1B0S1U1P1?S1S1P0(aq) + 2NHS1U1B14S1U1B0S1U1P1+S1S1P0(aq) + 2ClS1U1P1?S1S1P0(aq) ? 2NHS1U1B14S1U1B0S1U1P1+S1S1P0(aq) + 2NOS1U1B13S1U1B0S1U1P1?S1S1P0(aq) + PbClS1U1B12S1U1B0(s) 
D) NHS1U1B14S1U1B0S1U1P1+S1S1P0(aq) + NOS1U1B13S1U1B0S1U1P1?S1S1P0(aq) ? NHS1U1B14S1U1B0NOS1U1B13S1U1B0(s) 
E) NHS1U1B14S1U1B0S1U1P1+S1S1P0(aq) + NOS1U1B13S1U1B0S1U1P1?S1S1P0(aq) ? 2NO(g) + 2HS1U1B12S1U1B0O(l)

Question 9

What is the oxidation number of N in N2H4?

Accepted Answer

A) +4 
B) +2 
C) −2 
D) −4 
E) 0 
A) +4 
B) +2 
C) −2 
D) −4 
E) 0

Question 10

What is the oxidation number of oxygen in KMnO4?

Accepted Answer

A) +1 
B) −8 
C) +5 
D) −2 
E) +3 
A) +1 
B) −8 
C) +5 
D) −2 
E) +3

Question 11

If aqueous solutions of Na2CO3 and BaCl2 are mixed, which insoluble precipitate is formed?

Accepted Answer

A) Ba2CO3 
B) BaCO3 
C) NaCl 
D) NaCl2 
E) BaO 
A) Ba2CO3 
B) BaCO3 
C) NaCl 
D) NaCl2 
E) BaO

Question 12

Which is the net ionic equation for the reaction between aqueous solutions of lithium hydroxide and hydrobromic acid? LiOH(aq) + HBr(aq) → H2O(l) + LiBr(aq)

Accepted Answer

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

Question 13

Which equation describes a redox reaction?

Accepted Answer

A) 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g) 
B) 2KBr(aq) + Pb(NO3)2(aq) → 2KNO3(aq) + PbBr2(s) 
C) CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(g) 
D) H+(aq) + OH−(aq) → H2O(l) 
E) CO32−(aq) + HSO4−(aq) → HCO3−(aq) + SO42−(aq) 
A) 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g) 
B) 2KBr(aq) + Pb(NO3)2(aq) → 2KNO3(aq) + PbBr2(s) 
C) CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(g) 
D) H+(aq) + OH−(aq) → H2O(l) 
E) CO32−(aq) + HSO4−(aq) → HCO3−(aq) + SO42−(aq)

Question 14

Which of the following equations is not a redox reaction?

Accepted Answer

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

Question 15

If aqueous solutions of KMnO4, FeSO4 and H2SO4, are mixed, which ions are spectator ions? 2KMnO4(aq) + 10FeSO4(aq) + 8H2SO4(aq) → 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+ 
A) only K+  
B) only SO42− 
C) only K+ and SO42− 
D) only K+, SO42−, and Fe2+ 
E) only K+, SO42−, Fe2+, and Mn2+

Question 16

What is the oxidation number of iodine in I2?

Accepted Answer

A) −1 
B) 0 
C) +1 
D) +7 
E) −7 
A) −1 
B) 0 
C) +1 
D) +7 
E) −7

Question 17

What is oxidized in the following reaction? Fe + Ag2O → FeO + 2Ag

Accepted Answer

A) Ag 
B) Ag2O 
C) Fe 
D) FeO 
E) 2Ag 
A) Ag 
B) Ag2O 
C) Fe 
D) FeO 
E) 2Ag

Question 18

If aqueous solutions of lead(II) nitrate and sodium sulfate, which insoluble precipitate is formed?

Accepted Answer

A) NaNO3 
B) Na2NO3 
C) PbSO4 
D) Pb2SO4 
E) PbS 
A) NaNO3 
B) Na2NO3 
C) PbSO4 
D) Pb2SO4 
E) PbS

Question 19

Select the compound in which sulfur has its highest possible oxidation number.

Accepted Answer

A) H2S 
B) SO2 
C) SCl2 
D) H2SO3 
E) Na2SO4 
A) H2S 
B) SO2 
C) SCl2 
D) H2SO3 
E) Na2SO4

Question 20

If aqueous solutions of Pb(NO3)2 and NaCl are mixed, which ions, if any, are spectator ions? Pb(NO3)2(aq) + 2NaCl(aq) → 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) None are spectator ions. 
A) Pb2+(aq), Cl−(aq) 
B) Na+(aq), NO3− (aq) 
C) Pb2+(aq), NO3−(aq) 
D) Na+(aq), Cl−(aq) 
E) None are spectator ions.

Which balanced chemical equation could represent the following result of a precipitation reaction?

Which chemical equation describes an acid-base neutralization reaction?

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) SF₄ + H₂O → H₂SO₃ + HF

When the following equation is balanced with smallest whole number integers, what is the coefficient for HNO₃?

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? _ PCl₃(l) + _ H₂O(l) → _ H₃PO₃(aq) + _ HCl(aq)

Which salt is produced by the neutralization of hydrobromic acid with magnesium hydroxide?

What is the coefficient of H₂SO₄ when the following equation is properly balanced with the smallest set of whole numbers? _ Ca₃(PO₄)₂ + _ H₂SO₄ → _ CaSO₄ + _ H₃PO₄

What is the net ionic equation for the reaction that occurs when aqueous solutions of Pb(NO₃)₂ and NH₄Cl are mixed?

What is the oxidation number of N in N₂H₄?

What is the oxidation number of oxygen in KMnO₄?

If aqueous solutions of Na₂CO₃ and BaCl₂ are mixed, which insoluble precipitate is formed?

Which is the net ionic equation for the reaction between aqueous solutions of lithium hydroxide and hydrobromic acid? LiOH(aq) + HBr(aq) → H₂O(l) + LiBr(aq)

Which equation describes a redox reaction?

Which of the following equations is not a redox reaction?

If aqueous solutions of KMnO₄, FeSO₄ and H₂SO_4, are mixed, which ions are spectator ions? 2KMnO₄(aq) + 10FeSO₄(aq) + 8H₂SO₄(aq) → K₂SO₄(aq) + 2MnSO₄(aq) + 5Fe₂(SO₄)₃(aq) + 8H₂O(l)

What is the oxidation number of iodine in I₂?

What is oxidized in the following reaction? Fe + Ag₂O → FeO + 2Ag

If aqueous solutions of lead(II) nitrate and sodium sulfate, which insoluble precipitate is formed?

Select the compound in which sulfur has its highest possible oxidation number.

If aqueous solutions of Pb(NO₃)₂ and NaCl are mixed, which ions, if any, are spectator ions? Pb(NO₃)₂(aq) + 2NaCl(aq) → PbCl₂(s) + 2NaNO₃(aq)

Atoms and Elements

Electrons and the Periodic Table

Compounds and Chemical Bonds

How Chemists Use Numbers

The Mole and Chemical Formulas

Molecular Shape

Solids, Liquids, and Phase Changes

Gases

Physical Properties of Solutions

Using Balanced Chemical Equations

Acids and Bases

Equilibrium

Organic Chemistry

Biochemistry

Nuclear Chemistry

Electrochemistry

Filters

Exam 10: Chemical Reactions and Chemical Equations

Which balanced chemical equation could represent the following result of a precipitation reaction?

Which chemical equation describes an acid-base neutralization reaction?

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) __ SF4 + __ H2O → __ H2SO3 + __ HF

When the following equation is balanced with smallest whole number integers, what is the coefficient for HNO3?

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ PCl3(l) + ___ H2O(l) → ___ H3PO3(aq) + ___ HCl(aq)

Which salt is produced by the neutralization of hydrobromic acid with magnesium hydroxide?

What is the coefficient of H2SO4 when the following equation is properly balanced with the smallest set of whole numbers? ___ Ca3(PO4)2 + ___ H2SO4 → ___ CaSO4 + ___ H3PO4

What is the net ionic equation for the reaction that occurs when aqueous solutions of Pb(NO3)2 and NH4Cl are mixed?

What is the oxidation number of N in N2H4?

What is the oxidation number of oxygen in KMnO4?

If aqueous solutions of Na2CO3 and BaCl2 are mixed, which insoluble precipitate is formed?

Which is the net ionic equation for the reaction between aqueous solutions of lithium hydroxide and hydrobromic acid? LiOH(aq) + HBr(aq) → H2O(l) + LiBr(aq)

Which equation describes a redox reaction?

Which of the following equations is not a redox reaction?

If aqueous solutions of KMnO4, FeSO4 and H2SO4, are mixed, which ions are spectator ions? 2KMnO4(aq) + 10FeSO4(aq) + 8H2SO4(aq) → K2SO4(aq) + 2MnSO4(aq) + 5Fe2(SO4)3(aq) + 8H2O(l)

What is the oxidation number of iodine in I2?

What is oxidized in the following reaction? Fe + Ag2O → FeO + 2Ag

If aqueous solutions of lead(II) nitrate and sodium sulfate, which insoluble precipitate is formed?

Select the compound in which sulfur has its highest possible oxidation number.

If aqueous solutions of Pb(NO3)2 and NaCl are mixed, which ions, if any, are spectator ions? Pb(NO3)2(aq) + 2NaCl(aq) → PbCl2(s) + 2NaNO3(aq)

Atoms and Elements

Electrons and the Periodic Table

Compounds and Chemical Bonds

How Chemists Use Numbers

The Mole and Chemical Formulas

Molecular Shape

Solids, Liquids, and Phase Changes

Gases

Physical Properties of Solutions

Using Balanced Chemical Equations

Acids and Bases

Equilibrium

Organic Chemistry

Biochemistry

Nuclear Chemistry

Electrochemistry

Filters

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) SF₄ + H₂O → H₂SO₃ + HF

When the following equation is balanced with smallest whole number integers, what is the coefficient for HNO₃?

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? _ PCl₃(l) + _ H₂O(l) → _ H₃PO₃(aq) + _ HCl(aq)

What is the coefficient of H₂SO₄ when the following equation is properly balanced with the smallest set of whole numbers? _ Ca₃(PO₄)₂ + _ H₂SO₄ → _ CaSO₄ + _ H₃PO₄

What is the net ionic equation for the reaction that occurs when aqueous solutions of Pb(NO₃)₂ and NH₄Cl are mixed?

What is the oxidation number of N in N₂H₄?

What is the oxidation number of oxygen in KMnO₄?

If aqueous solutions of Na₂CO₃ and BaCl₂ are mixed, which insoluble precipitate is formed?

Which is the net ionic equation for the reaction between aqueous solutions of lithium hydroxide and hydrobromic acid? LiOH(aq) + HBr(aq) → H₂O(l) + LiBr(aq)

If aqueous solutions of KMnO₄, FeSO₄ and H₂SO_4, are mixed, which ions are spectator ions? 2KMnO₄(aq) + 10FeSO₄(aq) + 8H₂SO₄(aq) → K₂SO₄(aq) + 2MnSO₄(aq) + 5Fe₂(SO₄)₃(aq) + 8H₂O(l)

What is the oxidation number of iodine in I₂?

What is oxidized in the following reaction? Fe + Ag₂O → FeO + 2Ag

If aqueous solutions of Pb(NO₃)₂ and NaCl are mixed, which ions, if any, are spectator ions? Pb(NO₃)₂(aq) + 2NaCl(aq) → PbCl₂(s) + 2NaNO₃(aq)