Question 1

Assign oxidation numbers to each atom in nitrous acid.

Accepted Answer

A) H = +1,N = +5,O = -1 
B) H = +1,N = +5,O = -2 
C) H = +1,N = +3,O = -1 
D) H = +1,N = +3,O = 0 
E) H = +1,N = +3,O = -2 
A) H = +1,N = +5,O = -1 
B) H = +1,N = +5,O = -2 
C) H = +1,N = +3,O = -1 
D) H = +1,N = +3,O = 0 
E) H = +1,N = +3,O = -2

Question 2

Which of the following species cannot function as an oxidizing agent?

Accepted Answer

A) Co3+ 
B) O2 
C) Cr2O72- 
D) MnO4- 
E) O2- 
A) Co3+ 
B) O2 
C) Cr2O72- 
D) MnO4- 
E) O2-

Question 3

In which of the following molecules or ions does the underlined element have an oxidation number of -3?

Accepted Answer

A) NO2 
B) PH4+ 
C) CrO2Cl2 
D) HNO2 
E) Zn(OH)42- 
A) NO2 
B) PH4+ 
C) CrO2Cl2 
D) HNO2 
E) Zn(OH)42-

Question 4

What is the balanced reduction half-reaction for the reaction
3Mg(s)+ N2(g)→ Mg3N2(s)

Accepted Answer

A) Mg2+ + 2e− → Mg 
B) Mg → Mg2+ + 2e− 
C) Mg2+ → Mg + 2e− 
D) N2 + 6e− → 2N3− 
E) N2 → 2N3−+ 6e− 
A) Mg2+ + 2e− → Mg 
B) Mg → Mg2+ + 2e− 
C) Mg2+ → Mg + 2e− 
D) N2 + 6e− → 2N3− 
E) N2 → 2N3−+ 6e−

Question 5

How many moles of sulfate ions are there in a 0.301-L solution of 0.274 M Al2(SO4)3?

Accepted Answer

A) 0.0824 mol 
B) 0.247 mol 
C) 3.29 mol 
D) 0.0274 mol 
E) 2.73 mol 
A) 0.0824 mol 
B) 0.247 mol 
C) 3.29 mol 
D) 0.0274 mol 
E) 2.73 mol

Question 6

What products result from mixing aqueous solutions of Ni(C2H3O2)2(aq)and K3PO4(aq)?

Accepted Answer

A) Ni2PO4(s)and K3(C2H3O2)2(aq) 
B) Ni3(PO4)2(s)and KC2H3O2(s) 
C) NiP(s),CO2(g),H2O(l),KOH(aq),and PH3(g). 
D) NiPO4(s)and K3(C2H3O2)2(aq) 
E) Ni3(PO4)2(s),K+(aq),and C2H3O2−(aq) 
A) Ni2PO4(s)and K3(C2H3O2)2(aq) 
B) Ni3(PO4)2(s)and KC2H3O2(s) 
C) NiP(s),CO2(g),H2O(l),KOH(aq),and PH3(g). 
D) NiPO4(s)and K3(C2H3O2)2(aq) 
E) Ni3(PO4)2(s),K+(aq),and C2H3O2−(aq)

Question 7

The following reaction occurs in basic solution.What is the sum of the lowest whole-number coefficients in the balanced equation?
____ MnO4-(aq)+ ____ NH3(aq)→ ____ NO3-(aq)+ ____ MnO2(s)

Accepted Answer

A) 9 
B) 18 
C) 12 
D) 29 
E) 23 
A) 9 
B) 18 
C) 12 
D) 29 
E) 23

Question 8

The net ionic equation for the reaction between aqueous ammonia and hydrobromic acid is

Accepted Answer

A) HBr(aq)+ NH3(aq)→ NH4Br(aq). 
B) H+(aq)+ OH-(aq)→ H2O(l). 
C) HBr(aq)+ OH-(aq)→ Br-(aq)+ H2O(l). 
D) H+(aq)+ NH3(aq)→ NH4+(aq). 
E) H+(aq)+ Br-(aq)+ NH3(aq)→ NH4+(aq)+ Br-(aq). 
A) HBr(aq)+ NH3(aq)→ NH4Br(aq). 
B) H+(aq)+ OH-(aq)→ H2O(l). 
C) HBr(aq)+ OH-(aq)→ Br-(aq)+ H2O(l). 
D) H+(aq)+ NH3(aq)→ NH4+(aq). 
E) H+(aq)+ Br-(aq)+ NH3(aq)→ NH4+(aq)+ Br-(aq).

Question 9

What is the molarity of an NaI solution that contains 7.0 g of NaI in 21.0 mL of solution?

Accepted Answer

A) 2.2 M 
B) 0.046 M 
C) 0.003 M 
D) 0.00014 M 
E) 0.33 M 
A) 2.2 M 
B) 0.046 M 
C) 0.003 M 
D) 0.00014 M 
E) 0.33 M

Question 10

Which of the following is a strong acid in aqueous solution?

Accepted Answer

A) H3PO3 
B) H3PO4 
C) H2CO3 
D) H2SO3 
E) H2SO4 
A) H3PO3 
B) H3PO4 
C) H2CO3 
D) H2SO3 
E) H2SO4

Question 11

For the reaction that occurs in a lead storage battery,
Pb(s)+ PbO2(s)+ 2H+(aq)+ 2HSO4-(aq)→ 2PbSO4(s)+ 2H2O(l)
The oxidizing agent is

Accepted Answer

A) HSO4-. 
B) PbSO4. 
C) Pb. 
D) PbO2. 
E) H+. 
A) HSO4-. 
B) PbSO4. 
C) Pb. 
D) PbO2. 
E) H+.

Question 12

The reaction of H2SO4 with NaOH is represented by the equation
H2SO4(aq)+ 2NaOH(aq)→ Na2SO4(aq)+ 2H2O(l)
What volume of 0.752 M H2SO4 is required to neutralize 33.7 mL of 0.483 M NaOH?

Accepted Answer

A) 10.8 mL 
B) 1.32 mL 
C) 21.6 mL 
D) 33.7 mL 
E) 52.4 mL 
A) 10.8 mL 
B) 1.32 mL 
C) 21.6 mL 
D) 33.7 mL 
E) 52.4 mL

Question 13

What is the average oxidation number of C in C6H12O6?

Accepted Answer

A) -2 
B) 0 
C) +1 
D) +2 
E) -1 
A) -2 
B) 0 
C) +1 
D) +2 
E) -1

Question 14

All of the following reactions are described as decomposition reactions except

Accepted Answer

A) PCl5(g)→ PCl3(g)+ Cl2(g). 
B) 2H2O(g)→ 2H2(g)+ O2(g). 
C) BaCl2 • 2H2O(s)→ BaCl2(s)+ 2H2O(g). 
D) CH4(g)+ Cl2(g)→ CH3Cl(g)+ HCl(g). 
E) CaCO3(s)→ CaO(s)+ CO2(g). 
A) PCl5(g)→ PCl3(g)+ Cl2(g). 
B) 2H2O(g)→ 2H2(g)+ O2(g). 
C) BaCl2 • 2H2O(s)→ BaCl2(s)+ 2H2O(g). 
D) CH4(g)+ Cl2(g)→ CH3Cl(g)+ HCl(g). 
E) CaCO3(s)→ CaO(s)+ CO2(g).

Question 15

The following change occurs in acidic solution:
____ S2-(aq)+ ____ Cr2O72-(aq)→ ____ S(s)+ ____ Cr3+(aq)
In the balanced equation,for every mole of Cr2O72- that reacts,_____ mol of H+ are consumed.

Accepted Answer

A) 7 
B) 10 
C) 5 
D) 14 
E) 8 
A) 7 
B) 10 
C) 5 
D) 14 
E) 8

Question 16

Identify the true relationship between molarity and moles of a solute.

Accepted Answer

A) ​Molarity = (moles of solute / liters of solution) 
B) ​Molarity = (moles of solute * liters of solution) 
C) ​Molarity = (moles of solute + liters of solution) 
D) ​Molarity = (moles of solute − liters of solution) 
E) ​Molarity = (moles of solute % liters of solution) 
A) ​Molarity = (moles of solute / liters of solution) 
B) ​Molarity = (moles of solute * liters of solution) 
C) ​Molarity = (moles of solute + liters of solution) 
D) ​Molarity = (moles of solute − liters of solution) 
E) ​Molarity = (moles of solute % liters of solution)

Question 17

Which of the following is not a strong acid in aqueous solution?

Accepted Answer

A) HBr 
B) HClO4 
C) HF 
D) HI 
E) HCl 
A) HBr 
B) HClO4 
C) HF 
D) HI 
E) HCl

Question 18

Which of the following is an oxidation-reduction reaction?

Accepted Answer

A) PbCO3(s)+ 2HNO3(aq)→ Pb(NO3)2(aq)+ CO2(g)+ H2O(l) 
B) Na2O(s)+ H2O(l)→ 2NaOH(aq) 
C) SO3(g)+ H2O(l)→ H2SO4(aq) 
D) CO2(g)+ H2O(l)→ H2CO3(aq) 
E) C2H4(g)+ H2(g)→ C2H6(g) 
A) PbCO3(s)+ 2HNO3(aq)→ Pb(NO3)2(aq)+ CO2(g)+ H2O(l) 
B) Na2O(s)+ H2O(l)→ 2NaOH(aq) 
C) SO3(g)+ H2O(l)→ H2SO4(aq) 
D) CO2(g)+ H2O(l)→ H2CO3(aq) 
E) C2H4(g)+ H2(g)→ C2H6(g)

Question 19

In basic solution,H2O2 oxidizes Cr3+ to CrO42- and is reduced to OH-.What is the lowest whole-number coefficient for OH- in the balanced net ionic equation?

Accepted Answer

A) 6 
B) 10 
C) 4 
D) 16 
E) 8 
A) 6 
B) 10 
C) 4 
D) 16 
E) 8

Question 20

What is the oxidation number of each O in NH4(H2PO4)?

Accepted Answer

A) 5 
B) 1 
C) -2 
D) -3 
E) 0 
A) 5 
B) 1 
C) -2 
D) -3 
E) 0

Exam 4: Chemical Reactions

Assign oxidation numbers to each atom in nitrous acid.

Which of the following species cannot function as an oxidizing agent?

In which of the following molecules or ions does the underlined element have an oxidation number of -3?

What is the balanced reduction half-reaction for the reaction 3Mg(s)+ N2(g)→ Mg3N2(s)

How many moles of sulfate ions are there in a 0.301-L solution of 0.274 M Al2(SO4)3?

What products result from mixing aqueous solutions of Ni(C2H3O2)2(aq)and K3PO4(aq)?

The following reaction occurs in basic solution.What is the sum of the lowest whole-number coefficients in the balanced equation? ____ MnO4-(aq)+ ____ NH3(aq)→ ____ NO3-(aq)+ ____ MnO2(s)

The net ionic equation for the reaction between aqueous ammonia and hydrobromic acid is

What is the molarity of an NaI solution that contains 7.0 g of NaI in 21.0 mL of solution?

Which of the following is a strong acid in aqueous solution?

For the reaction that occurs in a lead storage battery, Pb(s)+ PbO2(s)+ 2H+(aq)+ 2HSO4-(aq)→ 2PbSO4(s)+ 2H2O(l) The oxidizing agent is

The reaction of H2SO4 with NaOH is represented by the equation H2SO4(aq)+ 2NaOH(aq)→ Na2SO4(aq)+ 2H2O(l) What volume of 0.752 M H2SO4 is required to neutralize 33.7 mL of 0.483 M NaOH?

What is the average oxidation number of C in C6H12O6?

All of the following reactions are described as decomposition reactions except

The following change occurs in acidic solution: ____ S2-(aq)+ ____ Cr2O72-(aq)→ ____ S(s)+ ____ Cr3+(aq) In the balanced equation,for every mole of Cr2O72- that reacts,_____ mol of H+ are consumed.

Identify the true relationship between molarity and moles of a solute.

Which of the following is not a strong acid in aqueous solution?

Which of the following is an oxidation-reduction reaction?

In basic solution,H2O2 oxidizes Cr3+ to CrO42- and is reduced to OH-.What is the lowest whole-number coefficient for OH- in the balanced net ionic equation?

What is the oxidation number of each O in NH4(H2PO4)?

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Filters

What is the balanced reduction half-reaction for the reaction 3Mg(s)+ N₂(g)→ Mg₃N₂(s)

How many moles of sulfate ions are there in a 0.301-L solution of 0.274 M Al₂(SO₄)₃?

What products result from mixing aqueous solutions of Ni(C₂H₃O₂)₂(aq)and K₃PO₄(aq)?

The following reaction occurs in basic solution.What is the sum of the lowest whole-number coefficients in the balanced equation? MnO₄^-(aq)+ NH₃(aq)→ NO₃^-(aq)+ MnO₂(s)

For the reaction that occurs in a lead storage battery, Pb(s)+ PbO₂(s)+ 2H⁺(aq)+ 2HSO₄^-(aq)→ 2PbSO₄(s)+ 2H₂O(l) The oxidizing agent is

The reaction of H₂SO₄ with NaOH is represented by the equation H₂SO₄(aq)+ 2NaOH(aq)→ Na₂SO₄(aq)+ 2H₂O(l) What volume of 0.752 M H₂SO₄ is required to neutralize 33.7 mL of 0.483 M NaOH?

What is the average oxidation number of C in C₆H₁₂O₆?

The following change occurs in acidic solution: S^2-(aq)+ Cr₂O₇^2-(aq)→ S(s)+ Cr³⁺(aq) In the balanced equation,for every mole of Cr₂O₇^2- that reacts,_ mol of H⁺ are consumed.

In basic solution,H₂O₂ oxidizes Cr³⁺ to CrO₄^2- and is reduced to OH^-.What is the lowest whole-number coefficient for OH^- in the balanced net ionic equation?

What is the oxidation number of each O in NH₄(H₂PO₄)?