A rechargeable nickel-cadmium (NiCd) battery contains the following half-reactions: NiO2 +2H2O(l)+2e– → Ni(OH)2 +2OH– E0 =0.49V...
A rechargeable nickel-cadmium (NiCd) battery contains the following half-reactions:
NiO2 +2H2O(l)+2e– → Ni(OH)2 +2OH– E0 =0.49V
Cd(OH)2 +2e– →Cd(s)+2OH– E0 =–0.81V
a. What is the standard cell potential or voltage of this NiCd cell?
b. Write the net chemical reaction in the direction of spontaneous reaction. Is cadmium oxidized or reduced?
c. Write an expression for the reaction quotient Q. What is Q if the electrolyte concentrations are: [NiO2] = 1 M and [Cd(OH)2] = 0.01M and [Ni(OH)2] = 0.001 M?
d. What is the battery voltage at 0oC with the electrolyte concentrations listed above?
Homework Answers
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A rechargeable nickel-cadmium (NiCd) battery contains the
following half-reactions:
NiO2 +2H2O(l)+2e– → Ni(OH)2 +2OH– E0 =0.49V...
The following half-reactions occur during use of the rechargeable nickel-cadmium battery: Ca(OH)2(s) + 2e → Cd(s)...
The following half-reactions occur during use of the rechargeable nickel-cadmium battery: Ca(OH)2(s) + 2e → Cd(s) + 20H(aq) NiO(OH)(s) + H20(1) + e- → Ni(OH)2(s) + OH(aq) This battery has a potential of 1.35 V under standard conditions, with nickel as the cathode. What potential does this battery produce if its hydroxide ion concentration is 1.97 x 10-2 M? E = V the tolerance is +/-2%
5. The nickel-cadmium battery, despite issues with the toxicity of Cd, is still used in some...
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In a nickel-cadmium battery, NiO(OH) is reduced to: Ni(OH)4, NiOH, NiO2, Ni, or Ni(OH)2
In a nickel-cadmium battery, NiO(OH) is reduced to: Ni(OH)4, NiOH, NiO2, Ni, or Ni(OH)2
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A Nickel-Cadmium rechargeable battery can provide about 1.2 V via the following reaction, which is occurring in the battery: Cd(s) + NiO2(s) + 2H2O(1) 4Cd(OH)2 + Ni(OH)2(s) Eventually, the battery dies and you have to plug in your battery-powered device to recharge the battery. While the battery is plugged in and being recharged, what chemical reaction occurs in the battery? (We didn't really talk about it, but you're smart people so use your brains!) - The forward reaction as shown...
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1)What is the overall cell reaction of a galvanic cell employing the following half-reactions? NiO2(s) + 2H2O + 2e- ⇄ Ni(OH)2(s) + 2OH-(aq), E°NiO2= 0.49 V; Fe(OH)2(s) + 2e- ⇄ Fe(s) + 2OH-(aq), E°Fe(OH)2= − 0.88 V. A)NiO2(s) + 2Fe(s) + 2H2O → Ni(OH)2(s) + 2Fe(OH)2(s) B)NiO2(s) + Fe(s) + 2H2O → Ni(OH)2(aq) + Fe(OH)2(aq) C)NiO2(s) + Fe(s) + 2H2O → Ni(OH)2(s) + Fe(OH)2(s) D)Ni(OH)2(s) + Fe(OH)2(s) → NiO2(s) + Fe(s) + 2H2O 2)What is the standard cell potential of...
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27. If the half-life of a radioactive element is 500 years and the original sample is 24 grams, how much of the sample will remain after 1500 years? A. 12 B. 6 C. 3 D. 1.5 30. Nickel-cadmium batteries are used in rechargeable electronic calculators. Which substance is oxidized in the following balanced reaction for recharging a NiCd battery? Ca(OH)2 (s) + Ni(OH)2 → Cd (s) + NiO2 (s) + 2H20 (1) A. H20...
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The following half-reactions occur during use of the rechargeable nickel-cadmium battery: Ca(OH)2(s) + 2e → Cd(s) + 20H(aq) NiO(OH)(s) + H20(1) + e- → Ni(OH)2(s) + OH(aq) This battery has a potential of 1.35 V under standard conditions, with nickel as the cathode. What potential does this battery produce if its hydroxide ion concentration is 1.97 x 10-2 M? E = V the tolerance is +/-2%
5. The nickel-cadmium battery, despite issues with the toxicity of Cd, is still used in some rechargeable batteries because it has very consistent voltage over long discharge times. a) Using only half-cell reactions given in Table 16.1, write the overall reaction and give the highest AV° value possible for a NiCd battery. b) The actual half-cell reactions used in a Nicd battery are: Ca(OH)2(8) + 2e → Cds + 2OH(aq) (Vº = -0.86V) NiO(OH)) + H2O) +e Ni(OH)2(s) + OH(aq)...
A Nickel-Cadmium rechargeable battery can provide about 1.2 V via the following reaction, which is occurring in the battery: Cd(s) + NiO2(s) + 2H2O(1) 4Cd(OH)2 + Ni(OH)2(s) Eventually, the battery dies and you have to plug in your battery-powered device to recharge the battery. While the battery is plugged in and being recharged, what chemical reaction occurs in the battery? (We didn't really talk about it, but you're smart people so use your brains!) - The forward reaction as shown...
Question 13 3 pts The nickel-cadmium battery used in power tools delivers a voltage of 120V. Calculate the standard free-energy change (in kilojoules) for the cell reaction Cd(e) + 2NO(OH)) + 2H,00 Ca(OH)3() +2 NI(OH),(6) 0-463 0-232 kJ O 3471 0-1151 Question 14 3 pts Consider the following table of standard reduction potentials: Reduction Half-Reaction - 3 1.50 +2 20 0.17 0.89 A Which substances can be reduced by C+1 Diana DDR Question 15 3 pts
just the answers please thank you
27. If the half-life of a radioactive element is 500 years and the original sample is 24 grams, how much of the sample will remain after 1500 years? A. 12 B. 6 C. 3 D. 1.5 30. Nickel-cadmium batteries are used in rechargeable electronic calculators. Which substance is oxidized in the following balanced reaction for recharging a NiCd battery? Ca(OH)2 (s) + Ni(OH)2 → Cd (s) + NiO2 (s) + 2H20 (1) A. H20...
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