Question 1

Which of the following statements about voltaic and electrolytic cells is correct?

Accepted Answer

The free energy change, ΔG, is negative for a voltaic cell, indicating a spontaneous reaction. In an electrolytic cell, an external source of energy is required to drive a non-spontaneous reaction.

All other statements are incorrect. The anode in a voltaic cell will lose weight, not gain weight (A); oxidation occurs at the anode in a voltaic cell, not the cathode (B); and the electrons flow from anode to cathode in both types of cells, not cathode to anode (D).

Question 2

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for the hydrogen sulfate ion will be ______. Al(s)+ HSO₄^-(aq)+ OH^-(aq) $\to$ Al₂O₃(s)+ S^2-(aq)+ H₂O(l)

Accepted Answer

B

Question 3

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for nitrogen dioxide will be _____. I₂(s)+ HNO₃(aq) $\to$ HIO₃(aq)+ NO₂(g)+ H₂O(l)

Accepted Answer

D

Question 4

Consider the following balanced redox reaction 3CuO(s)+ 2NH₃(aq) $\to$N₂(g)+ 3H₂O(l)+ 3Cu(s) Which of the following statements is true?

Accepted Answer

The answer of Consider the following balanced redox reaction 3CuO(s)+ 2NH₃(aq)...

Question 5

Consider the reaction CuO(s)+ H₂(g) $\to$ Cu(s)+ H₂O(l) In this reaction,which substances are the oxidant and reductant,respectively?

Accepted Answer

In this reaction, CuO is being reduced to Cu (gaining electrons) and H₂ is being oxidized to H₂O (losing electrons). Therefore, CuO is the oxidant (causing oxidation) and H₂ is the reductant (causing reduction).

Question 6

A voltaic cell prepared using zinc and iodine has the following cell notation. Zn(s)| Zn²⁺(aq)|| I^-(aq)| I₂(s)| C (graphite) Which of the following equations correctly represents the balanced,spontaneous,cell reaction?

Accepted Answer

The answer of A voltaic cell prepared using zinc and...

Question 7

Consider the following redox equation Mn(OH)₂(s)+ MnO₄^-(aq) $\to$MnO₄^2-(aq)(basic solution) When the equation is balanced with smallest whole number coefficients,what is the coefficient for OH^-(aq)and on which side of the equation is OH^-(aq)present?

Accepted Answer

First,we need to balance the equation by finding the oxidation states of each element and determining which are being oxidized and reduced. Since Mn changes from +2 to +4, it is being oxidized and since O changes from -2 to -1, it is being reduced. Once we determine this, we can balance the equation by adding coefficients to balance the number of electrons transferred. 
Hence, Mn(OH)2 is being oxidized and MnO42- is being reduced. We can balance the equation by adding coefficients on the reactants and products as follows:
Mn(OH)2 + MnO42- + OH- → MnO2 + MnO2(OH)22- + H2O
Now, we can see that there are 6 OH- on the reactant side and 12 OH- on the product side. Therefore, we need to add 6 more OH- on the reactant side to balance the equation. This gives us:
Mn(OH)2 + MnO42- + 6OH- → MnO2 + MnO2(OH)22- + 7H2O
Now, we can see that there are 4 OH- on both sides of the equation. Therefore, the coefficient for OH- is 4. Since OH- is on the reactant side of the equation, the answer is (C) 6, reactant side.

Question 8

Consider the following balanced redox reaction Mn²⁺(aq)+ S₂O₈^2-(aq)+ 2H₂O(l) $\to$MnO₂(s)+ 4H⁺(aq)+ 2SO₄^2-(aq) Which of the following statements is true?

Accepted Answer

The answer of Consider the following balanced redox reaction Mn²⁺(aq)+ S₂O₈^2-(aq)+...

Question 9

Which of the following solids is commonly used as an inactive electrode in electrochemical cells?

Accepted Answer

Graphite is commonly used as an inactive electrode in electrochemical cells because it is a good conductor of electricity, chemically inert, and does not react with the electrolyte. Zinc, copper, iron, and sodium can all be used as active electrodes depending on the specific electrochemical reaction being studied or the goal of the experiment, but they are not typically used as inactive electrodes.

Question 10

Which of the following statements about voltaic and electrolytic cells is correct?

Accepted Answer

The answer of Which of the following statements about voltaic...

Question 11

Which one of the following pairs of substances could be used to construct a single redox electrode (i.e. ,they have an element in common,but in different oxidation states)?

Accepted Answer

MnO and MnS have Mn in different oxidation states (+2 and +4 respectively) and can be used to construct a redox electrode. None of the other options have elements in different oxidation states.

Question 12

A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s)| Al³⁺(aq)|| Ni²⁺(aq)| Ni(s) Which of the following reactions occurs at the anode?

Accepted Answer

The anode is the electrode where oxidation occurs. In this case, aluminum is oxidized to aluminum ions, so the correct answer is A.

Question 13

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for zinc will be _____. Zn(s)+ ReO₄^-(aq) $\to$ Re(s)+ Zn²⁺(aq)(acidic solution)

Accepted Answer

The oxidation state of Zn changes from 0 to +2, and the oxidation state of Re changes from +7 to 0. To balance the equation, we need to make sure that the number of electrons lost by Zn is the same as the number of electrons gained by Re. Therefore, we need to multiply the first half-reaction (Zn) by 7 and the second half-reaction (Re) by 2. This gives us:

7Zn(s) + 2ReO4-(aq) + 14H+(aq) → 2Re(s) + 7Zn2+(aq) + 12H2O(l) + H2SO4(aq)

The coefficient for zinc is 7.

Question 14

A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s)| Al³⁺(aq)|| Ni²⁺(aq)| Ni(s) Which of the following represents the correctly balanced spontaneous reaction equation for the cell?

Accepted Answer

The balanced equation for the spontaneous reaction in the voltaic cell is 3Ni²⁺(aq) + 2Al(s) → 2Al³⁺(aq) + 3Ni(s), which correctly balances the charges and atoms on both sides.

Question 15

A voltaic cell is prepared using copper and silver.Its cell notation is shown below. Cu(s)| Cu²⁺(aq)|| Ag⁺(aq)| Ag(s) Which of the following processes occurs at the cathode?

Accepted Answer

The cathode is where reduction occurs. In this case, silver ions (Ag⁺) are being reduced to Ag(s), so the correct choice is D, where Ag(s) is produced at the cathode.

Question 16

Which one of the following statements about electrochemical cells is correct?

Accepted Answer

In a voltaic cell, the anode is where oxidation occurs and is labeled as the negative terminal.

Question 17

Which component of the following cell notation is the anode?
P | Q || R | S

Accepted Answer

In cell notation, the anode is always written on the left side. The anode is where oxidation occurs, and in this notation, P represents the anode.

Question 18

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for the iodide ion will be _____. I^-(aq)+ NO₃^-(aq) $\to$ NO(g)+ I₂(s)(acidic solution)

Accepted Answer

In acidic solution, the balanced redox reaction is: 6I⁻ + 2NO₃⁻ + 4H⁺ → 2NO + 3I₂ + 2H₂O. The coefficient for the iodide ion (I⁻) is 6.

Question 19

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for Sn(OH)₃^- will be _____. Bi(OH)₃(s)+ Sn(OH)₃^-(aq) $\to$ Sn(OH)₆^2-(aq)+ Bi(s)(basic solution)

Accepted Answer

The answer of When the following redox equation is balanced...

Question 20

Which one of the following is not a redox reaction?

Accepted Answer

The answer of Which one of the following is not...

Quiz 21: Electrochemistry: Chemical Change and Electrical Work

Which of the following statements about voltaic and electrolytic cells is correct?

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for the hydrogen sulfate ion will be ______. Al(s) + HSO₄^-(aq) + OH^-(aq) $\to$ Al₂O₃(s) + S^2-(aq) + H₂O(l)

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for nitrogen dioxide will be _____. I₂(s) + HNO₃(aq) $\to$ HIO₃(aq) + NO₂(g) + H₂O(l)

Consider the following balanced redox reaction 3CuO(s) + 2NH₃(aq) $\to$ N₂(g) + 3H₂O(l) + 3Cu(s) Which of the following statements is true?

Consider the reaction CuO(s) + H₂(g) $\to$ Cu(s) + H₂O(l) In this reaction,which substances are the oxidant and reductant,respectively?

A voltaic cell prepared using zinc and iodine has the following cell notation. Zn(s) | Zn²⁺(aq) || I^-(aq) | I₂(s) | C (graphite) Which of the following equations correctly represents the balanced,spontaneous,cell reaction?

Consider the following redox equation Mn(OH) ₂(s) + MnO₄^-(aq) $\to$ MnO₄^2-(aq) (basic solution) When the equation is balanced with smallest whole number coefficients,what is the coefficient for OH^-(aq) and on which side of the equation is OH^-(aq) present?

Consider the following balanced redox reaction Mn²⁺(aq) + S₂O₈^2-(aq) + 2H₂O(l) $\to$ MnO₂(s) + 4H⁺(aq) + 2SO₄^2-(aq) Which of the following statements is true?

Which of the following solids is commonly used as an inactive electrode in electrochemical cells?

Which of the following statements about voltaic and electrolytic cells is correct?

Which one of the following pairs of substances could be used to construct a single redox electrode (i.e. ,they have an element in common,but in different oxidation states) ?

A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s) | Al³⁺(aq) || Ni²⁺(aq) | Ni(s) Which of the following reactions occurs at the anode?

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for zinc will be _____. Zn(s) + ReO₄^-(aq) $\to$ Re(s) + Zn²⁺(aq) (acidic solution)

A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s) | Al³⁺(aq) || Ni²⁺(aq) | Ni(s) Which of the following represents the correctly balanced spontaneous reaction equation for the cell?

A voltaic cell is prepared using copper and silver.Its cell notation is shown below. Cu(s) | Cu²⁺(aq) || Ag⁺(aq) | Ag(s) Which of the following processes occurs at the cathode?

Which one of the following statements about electrochemical cells is correct?

Which component of the following cell notation is the anode? P | Q || R | S

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for the iodide ion will be _____. I^-(aq) + NO₃^-(aq) $\to$ NO(g) + I₂(s) (acidic solution)

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for Sn(OH) ₃^- will be _____. Bi(OH) ₃(s) + Sn(OH) ₃^-(aq) $\to$ Sn(OH) ₆^2-(aq) + Bi(s) (basic solution)

Which one of the following is not a redox reaction?

Quiz 21: Electrochemistry: Chemical Change and Electrical Work

Which of the following statements about voltaic and electrolytic cells is correct?

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for the hydrogen sulfate ion will be ______. Al(s) + HSO4-(aq) + OH-(aq) →\to→ Al2O3(s) + S2-(aq) + H2O(l)

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for nitrogen dioxide will be _____. I2(s) + HNO3(aq) →\to→ HIO3(aq) + NO2(g) + H2O(l)

Consider the following balanced redox reaction 3CuO(s) + 2NH3(aq) →\to→ N2(g) + 3H2O(l) + 3Cu(s) Which of the following statements is true?

Consider the reaction CuO(s) + H2(g) →\to→ Cu(s) + H2O(l) In this reaction,which substances are the oxidant and reductant,respectively?

A voltaic cell prepared using zinc and iodine has the following cell notation. Zn(s) | Zn2+(aq) || I-(aq) | I2(s) | C (graphite) Which of the following equations correctly represents the balanced,spontaneous,cell reaction?

Consider the following redox equation Mn(OH) 2(s) + MnO4-(aq) →\to→ MnO42-(aq) (basic solution) When the equation is balanced with smallest whole number coefficients,what is the coefficient for OH-(aq) and on which side of the equation is OH-(aq) present?

Consider the following balanced redox reaction Mn2+(aq) + S2O82-(aq) + 2H2O(l) →\to→ MnO2(s) + 4H+(aq) + 2SO42-(aq) Which of the following statements is true?

Which of the following solids is commonly used as an inactive electrode in electrochemical cells?

Which of the following statements about voltaic and electrolytic cells is correct?

Which one of the following pairs of substances could be used to construct a single redox electrode (i.e. ,they have an element in common,but in different oxidation states) ?

A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s) | Al3+(aq) || Ni2+(aq) | Ni(s) Which of the following reactions occurs at the anode?

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for zinc will be _____. Zn(s) + ReO4-(aq) →\to→ Re(s) + Zn2+(aq) (acidic solution)

A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s) | Al3+(aq) || Ni2+(aq) | Ni(s) Which of the following represents the correctly balanced spontaneous reaction equation for the cell?

A voltaic cell is prepared using copper and silver.Its cell notation is shown below. Cu(s) | Cu2+(aq) || Ag+(aq) | Ag(s) Which of the following processes occurs at the cathode?

Which one of the following statements about electrochemical cells is correct?

Which component of the following cell notation is the anode? P | Q || R | S

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for the iodide ion will be _____. I-(aq) + NO3-(aq) →\to→ NO(g) + I2(s) (acidic solution)

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for Sn(OH) 3- will be _____. Bi(OH) 3(s) + Sn(OH) 3-(aq) →\to→ Sn(OH) 62-(aq) + Bi(s) (basic solution)

Which one of the following is not a redox reaction?

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for the hydrogen sulfate ion will be ______. Al(s) + HSO₄^-(aq) + OH^-(aq) $\to$ Al₂O₃(s) + S^2-(aq) + H₂O(l)

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for nitrogen dioxide will be _____. I₂(s) + HNO₃(aq) $\to$ HIO₃(aq) + NO₂(g) + H₂O(l)

Consider the following balanced redox reaction 3CuO(s) + 2NH₃(aq) $\to$ N₂(g) + 3H₂O(l) + 3Cu(s) Which of the following statements is true?

Consider the reaction CuO(s) + H₂(g) $\to$ Cu(s) + H₂O(l) In this reaction,which substances are the oxidant and reductant,respectively?

A voltaic cell prepared using zinc and iodine has the following cell notation. Zn(s) | Zn²⁺(aq) || I^-(aq) | I₂(s) | C (graphite) Which of the following equations correctly represents the balanced,spontaneous,cell reaction?

Consider the following redox equation Mn(OH) ₂(s) + MnO₄^-(aq) $\to$ MnO₄^2-(aq) (basic solution) When the equation is balanced with smallest whole number coefficients,what is the coefficient for OH^-(aq) and on which side of the equation is OH^-(aq) present?

Consider the following balanced redox reaction Mn²⁺(aq) + S₂O₈^2-(aq) + 2H₂O(l) $\to$ MnO₂(s) + 4H⁺(aq) + 2SO₄^2-(aq) Which of the following statements is true?

A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s) | Al³⁺(aq) || Ni²⁺(aq) | Ni(s) Which of the following reactions occurs at the anode?

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for zinc will be _____. Zn(s) + ReO₄^-(aq) $\to$ Re(s) + Zn²⁺(aq) (acidic solution)

A voltaic cell prepared using aluminum and nickel has the following cell notation. Al(s) | Al³⁺(aq) || Ni²⁺(aq) | Ni(s) Which of the following represents the correctly balanced spontaneous reaction equation for the cell?

A voltaic cell is prepared using copper and silver.Its cell notation is shown below. Cu(s) | Cu²⁺(aq) || Ag⁺(aq) | Ag(s) Which of the following processes occurs at the cathode?

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for the iodide ion will be _____. I^-(aq) + NO₃^-(aq) $\to$ NO(g) + I₂(s) (acidic solution)

When the following redox equation is balanced with smallest whole number coefficients,the coefficient for Sn(OH) ₃^- will be _____. Bi(OH) ₃(s) + Sn(OH) ₃^-(aq) $\to$ Sn(OH) ₆^2-(aq) + Bi(s) (basic solution)