Question 1

All galvanic cells require a salt bridge in order to operate.

Accepted Answer

A) True 
 B)False

Question 2

In a solution labeled "0.10 M HNO3," which of the following is correct?

Accepted Answer

A)  [HNO3] = 0.10 M 
B)  [H3O+] = 0.10 M, [NO3-] = 0.10 M 
C)  [H3O+] = 0.090 M, [NO3-] = 0.010 M 
D)  [HNO3] = 0.050 M, [H3O+] = 0.050 M, [NO3-] = 0.050 M 
E)  [H3O+] = 0.10 M, [OH-] = 1.0 * 10-7 M 
A)  [HNO3] = 0.10 M 
B)  [H3O+] = 0.10 M, [NO3-] = 0.10 M 
C)  [H3O+] = 0.090 M, [NO3-] = 0.010 M 
D)  [HNO3] = 0.050 M, [H3O+] = 0.050 M, [NO3-] = 0.050 M 
E)  [H3O+] = 0.10 M, [OH-] = 1.0 * 10-7 M

Question 3

For the cell diagram
Pt|H2(g)|H+(aq)mCo3+(aq),Co2+(aq)|Pt
write the reaction that occurs at the cathode.

Accepted Answer

Co³⁺(aq)+

Question 4

The standard voltage of the cell
Pt|H2(g)|H+(aq)M Cl-(aq)|AgCl(s)|Ag(s)
Is +0.22 V at 25$\omicron$C.Calculate the equilibrium constant for the reaction below.
2AgCl(s)+ H2(g)$\rightarrow$2Ag(s)+ 2H+(aq)+ 2C-(aq)

Accepted Answer

A)  3.7 
B)  7.4 
C)  5.2 * 103  
D)  1.7 * 103  
E)  2.7 * 107  
A)  3.7 
B)  7.4 
C)  5.2 * 103  
D)  1.7 * 103  
E)  2.7 * 107

Question 5

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 Cu2+(aq)?

Accepted Answer

1.3 * 10<s

Question 6

In a working electrochemical cell (+ cell voltage),the cations in the salt bridge move toward the cathode.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following produces the strongest conjugate base?

Accepted Answer

A)  HF (pKa = 3.45) 
B)  HClO (pKa = 7.53) 
C)  HCOOH (pKa = 3.75) 
D)  CH3COOH (pKa = 4.75) 
E)  HIO (pKa = 10.64) 
A)  HF (pKa = 3.45) 
B)  HClO (pKa = 7.53) 
C)  HCOOH (pKa = 3.75) 
D)  CH3COOH (pKa = 4.75) 
E)  HIO (pKa = 10.64)

Question 8

If 50.0 mL of 0.22 M NaCl(aq)is mixed with 50.0 mL of 0.0050 M AgNO3(aq),will AgCl(s)precipitate? Ksp(AgCl)= 1.6 × 10-10.

Accepted Answer

Yes,becaus

Question 9

The curve for the titration of 50.0 mL of 0.0200 M C6H5COOH(aq)
with 0.100 M NaOH(aq) is given below.What are the main species in the solution after 7.5 mL of base have been added?

Accepted Answer

C<sub>6</sub>H<sub>5

Question 10

If the value of Kb for pyridine is 1.8 *10-9, calculate the equilibrium constant for
C5H5NH+(aq)+ H2O(l)$\Leftrightarrow$ C5H5N(aq)+ H3O+(aq)

Accepted Answer

A)  -1.8 * 10-9  
B)  1.8 * 10-16  
C)  5.6 * 108  
D)  1.8 * 10-9  
E)  5.6 * 10-6  
A)  -1.8 * 10-9  
B)  1.8 * 10-16  
C)  5.6 * 108  
D)  1.8 * 10-9  
E)  5.6 * 10-6

Question 11

Both H2O and OH-can act as a Brønsted acid and a Brønsted base but not as a Lewis acid.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is the weakest acid?

Accepted Answer

A)  HNO3 
B)  HClO4 
C)  HClO2 
D)  HClO 
A)  HNO3 
B)  HClO4 
C)  HClO2 
D)  HClO

Question 13

The half-reaction that occurs at cathode when 1 M AgNO3(aq) is electrolyzed is __________________.

Accepted Answer

Question 14

Which of the following is the strongest reducing agent?

Accepted Answer

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

Question 15

What is the pH of an aqueous solution that is 0.20 M HNO2 (Ka = 4.3 * 10-4) and 0.20 M NaNO2?

Accepted Answer

A)  3.67 
B)  2.37 
C)  3.37 
D)  4.39 
E)  10.63 
A)  3.67 
B)  2.37 
C)  3.37 
D)  4.39 
E)  10.63

Question 16

Which of the following is the strongest base?

Accepted Answer

A)  methylamine (pKb = 3.44) 
B)  morphine (pKb = 5.79) 
C)  urea (pKb = 13.90) 
D)  ammonia (pKb = 4.75) 
E)  pyridine (pKb = 8.75) 
A)  methylamine (pKb = 3.44) 
B)  morphine (pKb = 5.79) 
C)  urea (pKb = 13.90) 
D)  ammonia (pKb = 4.75) 
E)  pyridine (pKb = 8.75)

Question 17

When KI(aq)is electrolyzed at a concentration of 1 M, the product at the anode is I2.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following does not have an amphoteric oxide?

Accepted Answer

A)  PbO 
B)  BeO 
C)  SnO 
D)  Al2O3 
E)  All have amphoteric oxides. 
A)  PbO 
B)  BeO 
C)  SnO 
D)  Al2O3 
E)  All have amphoteric oxides.

Question 19

When a sample of an unknown metal is dropped into 1 M H+(aq) under standard conditions,bubbles are observed.The unknown metal could be silver.

Accepted Answer

A) True 
 B)False

Question 20

The standard potential of the Cu2+/Cu electrode is +0.34 V and the standard potential of the cell
Ag(s)|AgCl(s)|Cl-(aq)M Cu2+(aq)|Cu(s)
Is +0.12 V.What is the standard potential of the AgCl/Ag,Cl- electrode?

Accepted Answer

A)  -0.46 V 
B)  -0.22 V 
C)  +0.24 V 
D)  +0.46 V 
E)  +0.22 V 
A)  -0.46 V 
B)  -0.22 V 
C)  +0.24 V 
D)  +0.46 V 
E)  +0.22 V

All galvanic cells require a salt bridge in order to operate.

In a solution labeled "0.10 M HNO₃," which of the following is correct?

For the cell diagram Pt|H₂(g)|H⁺(aq)mCo³⁺(aq),Co²⁺(aq)|Pt write the reaction that occurs at the cathode.

The standard voltage of the cell Pt|H₂(g)|H⁺(aq)M Cl^-(aq)|AgCl(s)|Ag(s) Is +0.22 V at 25^$\omicron$C.Calculate the equilibrium constant for the reaction below. 2AgCl(s)+ H₂(g) $\rightarrow$ 2Ag(s)+ 2H⁺(aq)+ 2C^-(aq)

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 Cu²⁺(aq)?

In a working electrochemical cell (+ cell voltage),the cations in the salt bridge move toward the cathode.

Which of the following produces the strongest conjugate base?

If 50.0 mL of 0.22 M NaCl(aq)is mixed with 50.0 mL of 0.0050 M AgNO₃(aq),will AgCl(s)precipitate? K_sp(AgCl)= 1.6 × 10^-¹⁰.

The curve for the titration of 50.0 mL of 0.0200 M C₆H₅COOH(aq) with 0.100 M NaOH(aq) is given below.What are the main species in the solution after 7.5 mL of base have been added?

If the value of K_b for pyridine is 1.8 *10^-⁹, calculate the equilibrium constant for C₅H₅NH⁺(aq)+ H₂O(l) $\Leftrightarrow$ C₅H₅N(aq)+ H₃O⁺(aq)

Both H₂O and OH^-can act as a Brønsted acid and a Brønsted base but not as a Lewis acid.

Which of the following is the weakest acid?

The half-reaction that occurs at cathode when 1 M AgNO₃(aq) is electrolyzed is __________________.

Which of the following is the strongest reducing agent?

What is the pH of an aqueous solution that is 0.20 M HNO₂ (K_a = 4.3 * 10^-⁴) and 0.20 M NaNO₂?

Which of the following is the strongest base?

When KI(aq)is electrolyzed at a concentration of 1 M, the product at the anode is I₂.

Which of the following does not have an amphoteric oxide?

When a sample of an unknown metal is dropped into 1 M H⁺(aq) under standard conditions,bubbles are observed.The unknown metal could be silver.

The standard potential of the Cu²⁺/Cu electrode is +0.34 V and the standard potential of the cell Ag(s)|AgCl(s)|Cl^-(aq)M Cu²⁺(aq)|Cu(s) Is +0.12 V.What is the standard potential of the AgCl/Ag,Cl^- electrode?

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

All galvanic cells require a salt bridge in order to operate.

In a solution labeled "0.10 M HNO3," which of the following is correct?

For the cell diagram Pt|H2(g)|H+(aq)mCo3+(aq),Co2+(aq)|Pt write the reaction that occurs at the cathode.

The standard voltage of the cell Pt|H2(g)|H+(aq)M Cl-(aq)|AgCl(s)|Ag(s) Is +0.22 V at 25 ο\omicronο C.Calculate the equilibrium constant for the reaction below. 2AgCl(s)+ H2(g) →\rightarrow→ 2Ag(s)+ 2H+(aq)+ 2C-(aq)

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 Cu2+(aq)?

In a working electrochemical cell (+ cell voltage),the cations in the salt bridge move toward the cathode.

Which of the following produces the strongest conjugate base?

If 50.0 mL of 0.22 M NaCl(aq)is mixed with 50.0 mL of 0.0050 M AgNO3(aq),will AgCl(s)precipitate? Ksp(AgCl)= 1.6 × 10-10.

The curve for the titration of 50.0 mL of 0.0200 M C6H5COOH(aq) with 0.100 M NaOH(aq) is given below.What are the main species in the solution after 7.5 mL of base have been added?

If the value of Kb for pyridine is 1.8 *10-9, calculate the equilibrium constant for C5H5NH+(aq)+ H2O(l) ⇔\Leftrightarrow⇔ C5H5N(aq)+ H3O+(aq)

Both H2O and OH-can act as a Brønsted acid and a Brønsted base but not as a Lewis acid.

Which of the following is the weakest acid?

The half-reaction that occurs at cathode when 1 M AgNO3(aq) is electrolyzed is __________________.

Which of the following is the strongest reducing agent?

What is the pH of an aqueous solution that is 0.20 M HNO2 (Ka = 4.3 * 10-4) and 0.20 M NaNO2?

Which of the following is the strongest base?

When KI(aq)is electrolyzed at a concentration of 1 M, the product at the anode is I2.

Which of the following does not have an amphoteric oxide?

When a sample of an unknown metal is dropped into 1 M H+(aq) under standard conditions,bubbles are observed.The unknown metal could be silver.

The standard potential of the Cu2+/Cu electrode is +0.34 V and the standard potential of the cell Ag(s)|AgCl(s)|Cl-(aq)M Cu2+(aq)|Cu(s) Is +0.12 V.What is the standard potential of the AgCl/Ag,Cl- electrode?

Atoms

Molecules

States of Matter

Thermodynamics

Equilibrium

Kinetics

The Main-Group Elements

The D-Block Elements

Nuclear Chemistry

Organic Chemistry

Filters

In a solution labeled "0.10 M HNO₃," which of the following is correct?

For the cell diagram Pt|H₂(g)|H⁺(aq)mCo³⁺(aq),Co²⁺(aq)|Pt write the reaction that occurs at the cathode.

The standard voltage of the cell Pt|H₂(g)|H⁺(aq)M Cl^-(aq)|AgCl(s)|Ag(s) Is +0.22 V at 25^$\omicron$C.Calculate the equilibrium constant for the reaction below. 2AgCl(s)+ H₂(g) $\rightarrow$ 2Ag(s)+ 2H⁺(aq)+ 2C^-(aq)

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 Cu²⁺(aq)?

If 50.0 mL of 0.22 M NaCl(aq)is mixed with 50.0 mL of 0.0050 M AgNO₃(aq),will AgCl(s)precipitate? K_sp(AgCl)= 1.6 × 10^-¹⁰.

The curve for the titration of 50.0 mL of 0.0200 M C₆H₅COOH(aq) with 0.100 M NaOH(aq) is given below.What are the main species in the solution after 7.5 mL of base have been added?

If the value of K_b for pyridine is 1.8 *10^-⁹, calculate the equilibrium constant for C₅H₅NH⁺(aq)+ H₂O(l) $\Leftrightarrow$ C₅H₅N(aq)+ H₃O⁺(aq)

Both H₂O and OH^-can act as a Brønsted acid and a Brønsted base but not as a Lewis acid.

The half-reaction that occurs at cathode when 1 M AgNO₃(aq) is electrolyzed is __________________.

What is the pH of an aqueous solution that is 0.20 M HNO₂ (K_a = 4.3 * 10^-⁴) and 0.20 M NaNO₂?

When KI(aq)is electrolyzed at a concentration of 1 M, the product at the anode is I₂.

When a sample of an unknown metal is dropped into 1 M H⁺(aq) under standard conditions,bubbles are observed.The unknown metal could be silver.

The standard potential of the Cu²⁺/Cu electrode is +0.34 V and the standard potential of the cell Ag(s)|AgCl(s)|Cl^-(aq)M Cu²⁺(aq)|Cu(s) Is +0.12 V.What is the standard potential of the AgCl/Ag,Cl^- electrode?