Question 1

The conjugate base of ammonia is

Accepted Answer

A)  NH2OH. 
B)  NH2--. 
C)  NH4+. 
D)  NH3. 
E)  OH-. 
A)  NH2OH. 
B)  NH2--. 
C)  NH4+. 
D)  NH3. 
E)  OH-.

Question 2

When sulfur trioxide dissolves in water, sulfuric acid is produced.An intermediate in the reaction is H2O-SO3.In the reaction of the intermediate to produce sulfuric acid,

Accepted Answer

A)  water acts both as an acid and a base. 
B)  water acts as a proton donor only. 
C)  water acts as a proton acceptor only. 
D)  the intermediate undergoes an intramolecular rearrangement to form the product. 
A)  water acts both as an acid and a base. 
B)  water acts as a proton donor only. 
C)  water acts as a proton acceptor only. 
D)  the intermediate undergoes an intramolecular rearrangement to form the product.

Question 3

A solution is prepared by mixing equal volumes of 0.40 M HF(aq)with 0.20 M KOH(aq).This solution is a buffer.

Accepted Answer

A) True 
 B)False

Question 4

For pyridine, pKb = 8.75.What is the pH of an aqueous buffer solution that is 0.300 M C5H5N(aq)And 0.500 MC5H5NHCl(aq)?

Accepted Answer

A)  8.53 
B)  5.25 
C)  8.97 
D)  5.47 
E)  5.03 
A)  8.53 
B)  5.25 
C)  8.97 
D)  5.47 
E)  5.03

Question 5

If you wish to increase the solubility of silver benzoate, a preservative,
You would

Accepted Answer

A)  add sodium hydroxide. 
B)  decrease the pH. 
C)  add sodium acetate. 
D)  add sodium benzoate. 
E)  add silver nitrate. 
A)  add sodium hydroxide. 
B)  decrease the pH. 
C)  add sodium acetate. 
D)  add sodium benzoate. 
E)  add silver nitrate.

Question 6

If ES1U1P1$\circ$S1S1P0
 for the disproportionation of Cu+(aq) to Cu2+(aq)And Cu(s)Is +0.18 V at 25$\omicron$C,Calculate the equilibrium constant for the reaction.

Accepted Answer

A)  1.2 * 106  
B)  3.9 * 1074  
C)  2.5 * 1014  
D)  35.7 
E)  3.3 * 1012  
A)  1.2 * 106  
B)  3.9 * 1074  
C)  2.5 * 1014  
D)  35.7 
E)  3.3 * 1012

Question 7

Is a 0.1 M aqueous solution of HPO42- acidic, basic,or neutral? Prove your answer using the appropriate equilibrium constants.

Accepted Answer

basic,K_b (HPO₄

Question 8

In a solution that is labeled "0.10 M H3PO4(aq)," [H3O+] = 0.024 M.Match the species below with their concentrations.
$$\begin{array} { l l } 
\mathrm { H } _ { 3 } \mathrm { PO } _ { 4 } & 6.2 \times 10 ^ { - 8 } \
\mathrm { H } _ { 2 } \mathrm { PO } _ { 4 } { } ^ { - } & 8.0 \times 10 ^ { - 2 } \
\mathrm { HPO } _ { 4 } { } ^ { 2 - } & 5.4 \times 10 ^ { - 19 } \
\mathrm { PO } _ { 4 } { } ^ { 3 - } & 2.4 \times 10 ^ { - 2 }
\end{array}$$

Accepted Answer

[H₃PO₄] = 8.0 * 10

Question 9

Consider the following cell:
Zn(s)|Zn2+(aq,0.10 M)m Cu2+(aq,0.10 M)|Cu(s)
At equilibrium,what is the concentration of Zn2+(aq)?

Accepted Answer

The answer of Consider the following cell:
Zn(s)|Zn2+(aq,0.10 M)m Cu2+(aq,0.10 M)|Cu(s)
At...

Question 10

Given: Cr(OH)3(s) $\rightarrow$CrO42-(aq),Basic solution.How many electrons appear in the balanced half-reaction?

Accepted Answer

A)  3 
B)  6 
C)  5 
D)  7 
E)  4 
A)  3 
B)  6 
C)  5 
D)  7 
E)  4

Question 11

Of the following five ions or molecules, which is the strongest reducing agent?

Accepted Answer

A)  Fe2+  
B)  Cr2+  
C)  F-  
D)  H2  
E)  Co2+  
A)  Fe2+  
B)  Cr2+  
C)  F-  
D)  H2  
E)  Co2+

Question 12

What is the relationship between the solubility in water, s,And Ksp for the ionic solid Ca3(PO4)2?

Accepted Answer

A)  Ksp = 72s5  
B)  Ksp = 5s  
C)  Ksp = 6s2 
D)  Ksp = s5 
A)  Ksp = 72s5  
B)  Ksp = 5s  
C)  Ksp = 6s2 
D)  Ksp = s5

Question 13

The titration curve for the titration of 0.100 M H2SO3(aq)
with 0.100 M KOH(aq) is given below.   
Estimate pKa1 and pKa2 of H2SO3.

Accepted Answer

pK_a1 ~ 2.0 a

Question 14

If the standard potential for Tl3+(aq)/Tl+(aq) is 1.21 V and the standard potential for Tl+(aq)/Tl(s)Is -0.34 V,Calculate the standard potential for
Tl3+(aq)+ 3e- $\rightarrow$ Tl(s).

Accepted Answer

A)  0.69 V 
B)  0.87 V 
C)  1.55 V 
D)  0.09 V 
E)  0.29 V 
A)  0.69 V 
B)  0.87 V 
C)  1.55 V 
D)  0.09 V 
E)  0.29 V

Question 15

When equilibrium is reached in an electrochemical cell,the voltage reaches its maximum value.

Accepted Answer

A) True 
 B)False

Question 16

What reaction occurs at the cathode in the following cell diagram?
Cd(s|CdSO4(aq)|Hg2SO4|Hg(l)

Accepted Answer

Hg<sub>2</sub>SO<sub

Question 17

A cell that uses bromine to oxidize chloride ion under standard conditions at 298 K has a positive potential.

Accepted Answer

A) True 
 B)False

Question 18

Calculate the ratio of the molarities of HPO42- and H2PO4- ions required to achieve buffering at pH = 7.00 .For H3PO4,PKa1 = 2.12,PKa2 = 7.21,And pKa3 = 12.68.

Accepted Answer

A)  0.81 
B)  1.23 
C)  0.62 
D)  0.21 
E)  1.62 
A)  0.81 
B)  1.23 
C)  0.62 
D)  0.21 
E)  1.62

Question 19

How many moles of Cl2(g) are produced by the electrolysis of concentrated sodium chloride if 2.00 A are passed through the solution for 4.00 hours? The equation for this process,The "chloralkali" process,Is
2NaCl(aq)+ 2H2O(l)$\rightarrow$2NaOH(aq)+ H2(g)+ Cl2(g)

Accepted Answer

A)  0.0745 mol 
B)  0.149 mol 
C)  0.447 mol 
D)  0.00248 mol 
E)  0.298 mol 
A)  0.0745 mol 
B)  0.149 mol 
C)  0.447 mol 
D)  0.00248 mol 
E)  0.298 mol

Question 20

What is the equilibrium constant for the reaction
HCN(aq)+ OH-(aq) 
$f$
CN-(aq)+ H2O(l)

Accepted Answer

A)  Ka/Kw 
B)  Kb 
C)  Kw/Ka 
D)  Kw/Kb 
E)  Kb/Kw 
A)  Ka/Kw 
B)  Kb 
C)  Kw/Ka 
D)  Kw/Kb 
E)  Kb/Kw

The conjugate base of ammonia is

When sulfur trioxide dissolves in water, sulfuric acid is produced.An intermediate in the reaction is H₂O-SO₃.In the reaction of the intermediate to produce sulfuric acid,

A solution is prepared by mixing equal volumes of 0.40 M HF(aq)with 0.20 M KOH(aq).This solution is a buffer.

For pyridine, pK_b = 8.75.What is the pH of an aqueous buffer solution that is 0.300 M C₅H₅N(aq)And 0.500 MC₅H₅NHCl(aq)?

If you wish to increase the solubility of silver benzoate, a preservative, You would

If E^$\circ$ for the disproportionation of Cu⁺(aq) to Cu²⁺(aq)And Cu(s)Is +0.18 V at 25^$\omicron$C,Calculate the equilibrium constant for the reaction.

Is a 0.1 M aqueous solution of HPO₄²^- acidic, basic,or neutral? Prove your answer using the appropriate equilibrium constants.

In a solution that is labeled "0.10 M H₃PO₄(aq)," [H₃O⁺] = 0.024 M.Match the species below with their concentrations. 6.2\times1 8.0\times1 5.4\times1 2.4\times1

Consider the following cell: Zn(s)|Zn²⁺(aq,0.10 M)m Cu²⁺(aq,0.10 M)|Cu(s) At equilibrium,what is the concentration of Zn²⁺(aq)?

Given: Cr(OH)₃(s) $\rightarrow$ CrO₄²^-(aq),Basic solution.How many electrons appear in the balanced half-reaction?

Of the following five ions or molecules, which is the strongest reducing agent?

What is the relationship between the solubility in water, s,And K_s_p for the ionic solid Ca₃(PO₄)₂?

The titration curve for the titration of 0.100 M H₂SO₃(aq) with 0.100 M KOH(aq) is given below. Estimate pK_a1 and pK_a2 of H₂SO₃.

If the standard potential for Tl³⁺(aq)/Tl⁺(aq) is 1.21 V and the standard potential for Tl⁺(aq)/Tl(s)Is -0.34 V,Calculate the standard potential for Tl³⁺(aq)+ 3e^- $\rightarrow$ Tl(s).

When equilibrium is reached in an electrochemical cell,the voltage reaches its maximum value.

What reaction occurs at the cathode in the following cell diagram? Cd(s|CdSO₄(aq)|Hg₂SO₄|Hg(l)

A cell that uses bromine to oxidize chloride ion under standard conditions at 298 K has a positive potential.

Calculate the ratio of the molarities of HPO₄²^- and H₂PO₄^- ions required to achieve buffering at pH = 7.00 .For H₃PO₄,PK_a1 = 2.12,PK_a2 = 7.21,And pK_a3 = 12.68.

How many moles of Cl₂(g) are produced by the electrolysis of concentrated sodium chloride if 2.00 A are passed through the solution for 4.00 hours? The equation for this process,The "chloralkali" process,Is 2NaCl(aq)+ 2H₂O(l) $\rightarrow$ 2NaOH(aq)+ H₂(g)+ Cl₂(g)

What is the equilibrium constant for the reaction HCN(aq)+ OH^-(aq) $f$ CN^-(aq)+ H₂O(l)

Atoms

Molecules

States of Matter

Thermodynamics

Equilibrium

Kinetics

The Main-Group Elements

The D-Block Elements

Nuclear Chemistry

Organic Chemistry

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Exam 6: Reactions

The conjugate base of ammonia is

When sulfur trioxide dissolves in water, sulfuric acid is produced.An intermediate in the reaction is H2O-SO3.In the reaction of the intermediate to produce sulfuric acid,

A solution is prepared by mixing equal volumes of 0.40 M HF(aq)with 0.20 M KOH(aq).This solution is a buffer.

For pyridine, pKb = 8.75.What is the pH of an aqueous buffer solution that is 0.300 M C5H5N(aq)And 0.500 MC5H5NHCl(aq)?

If you wish to increase the solubility of silver benzoate, a preservative, You would

If E ∘\circ∘ for the disproportionation of Cu+(aq) to Cu2+(aq)And Cu(s)Is +0.18 V at 25 ο\omicronο C,Calculate the equilibrium constant for the reaction.

Is a 0.1 M aqueous solution of HPO42- acidic, basic,or neutral? Prove your answer using the appropriate equilibrium constants.

In a solution that is labeled "0.10 M H3PO4(aq)," [H3O+] = 0.024 M.Match the species below with their concentrations. 6.2\times1 8.0\times1 5.4\times1 2.4\times1

Consider the following cell: Zn(s)|Zn2+(aq,0.10 M)m Cu2+(aq,0.10 M)|Cu(s) At equilibrium,what is the concentration of Zn2+(aq)?

Given: Cr(OH)3(s) →\rightarrow→ CrO42-(aq),Basic solution.How many electrons appear in the balanced half-reaction?

Of the following five ions or molecules, which is the strongest reducing agent?

What is the relationship between the solubility in water, s,And Ksp for the ionic solid Ca3(PO4)2?

The titration curve for the titration of 0.100 M H2SO3(aq) with 0.100 M KOH(aq) is given below. Estimate pKa1 and pKa2 of H2SO3.

If the standard potential for Tl3+(aq)/Tl+(aq) is 1.21 V and the standard potential for Tl+(aq)/Tl(s)Is -0.34 V,Calculate the standard potential for Tl3+(aq)+ 3e- →\rightarrow→ Tl(s).

When equilibrium is reached in an electrochemical cell,the voltage reaches its maximum value.

What reaction occurs at the cathode in the following cell diagram? Cd(s|CdSO4(aq)|Hg2SO4|Hg(l)

A cell that uses bromine to oxidize chloride ion under standard conditions at 298 K has a positive potential.

Calculate the ratio of the molarities of HPO42- and H2PO4- ions required to achieve buffering at pH = 7.00 .For H3PO4,PKa1 = 2.12,PKa2 = 7.21,And pKa3 = 12.68.

How many moles of Cl2(g) are produced by the electrolysis of concentrated sodium chloride if 2.00 A are passed through the solution for 4.00 hours? The equation for this process,The "chloralkali" process,Is 2NaCl(aq)+ 2H2O(l) →\rightarrow→ 2NaOH(aq)+ H2(g)+ Cl2(g)

What is the equilibrium constant for the reaction HCN(aq)+ OH-(aq) fff CN-(aq)+ H2O(l)

Atoms

Molecules

States of Matter

Thermodynamics

Equilibrium

Kinetics

The Main-Group Elements

The D-Block Elements

Nuclear Chemistry

Organic Chemistry

Filters

When sulfur trioxide dissolves in water, sulfuric acid is produced.An intermediate in the reaction is H₂O-SO₃.In the reaction of the intermediate to produce sulfuric acid,

For pyridine, pK_b = 8.75.What is the pH of an aqueous buffer solution that is 0.300 M C₅H₅N(aq)And 0.500 MC₅H₅NHCl(aq)?

If E^$\circ$ for the disproportionation of Cu⁺(aq) to Cu²⁺(aq)And Cu(s)Is +0.18 V at 25^$\omicron$C,Calculate the equilibrium constant for the reaction.

Is a 0.1 M aqueous solution of HPO₄²^- acidic, basic,or neutral? Prove your answer using the appropriate equilibrium constants.

In a solution that is labeled "0.10 M H₃PO₄(aq)," [H₃O⁺] = 0.024 M.Match the species below with their concentrations. 6.2\times1 8.0\times1 5.4\times1 2.4\times1

Consider the following cell: Zn(s)|Zn²⁺(aq,0.10 M)m Cu²⁺(aq,0.10 M)|Cu(s) At equilibrium,what is the concentration of Zn²⁺(aq)?

Given: Cr(OH)₃(s) $\rightarrow$ CrO₄²^-(aq),Basic solution.How many electrons appear in the balanced half-reaction?

What is the relationship between the solubility in water, s,And K_s_p for the ionic solid Ca₃(PO₄)₂?

The titration curve for the titration of 0.100 M H₂SO₃(aq) with 0.100 M KOH(aq) is given below. Estimate pK_a1 and pK_a2 of H₂SO₃.

If the standard potential for Tl³⁺(aq)/Tl⁺(aq) is 1.21 V and the standard potential for Tl⁺(aq)/Tl(s)Is -0.34 V,Calculate the standard potential for Tl³⁺(aq)+ 3e^- $\rightarrow$ Tl(s).

What reaction occurs at the cathode in the following cell diagram? Cd(s|CdSO₄(aq)|Hg₂SO₄|Hg(l)

Calculate the ratio of the molarities of HPO₄²^- and H₂PO₄^- ions required to achieve buffering at pH = 7.00 .For H₃PO₄,PK_a1 = 2.12,PK_a2 = 7.21,And pK_a3 = 12.68.

How many moles of Cl₂(g) are produced by the electrolysis of concentrated sodium chloride if 2.00 A are passed through the solution for 4.00 hours? The equation for this process,The "chloralkali" process,Is 2NaCl(aq)+ 2H₂O(l) $\rightarrow$ 2NaOH(aq)+ H₂(g)+ Cl₂(g)

What is the equilibrium constant for the reaction HCN(aq)+ OH^-(aq) $f$ CN^-(aq)+ H₂O(l)