Question

1--What is E°_cell for the following hypothetical reaction exactly as written (in volts), given the standard electrode potential (E°) values below?

X_(s) + Y²⁺_(aq) → X²⁺_(aq) + Y_(s)

X²⁺_(aq) + 2 e^- → X_(s)   E° = -0.69 V

Y²⁺_(aq) + 2 e^- → Y_(s)   E° = -2.45 V

2--In the following spontaneous voltaic cell, which of the following statements are TRUE? Select as many answers as are correct however points will be deducted for incorrect guesses.

Pt_(s)|H_2(g)|H⁺_(aq)|| Ag_(s)|Ag⁺_(aq)

Select one or more:

SHE is the anode

Eº_cell is positive

Ag+/Ag is the anode

SHE is the cathode

Ag+/Ag is the cathode

Eº_cell is negative

3--What is E_cell (in volts) for a concentration cell at 25.0°C based off the redox reactions of X_(s) / X²⁺ _(aq) with the following conditions? Express your answer to 3 decimal places.

At both the anode and cathode the metal X is dipped in solutions containing X²⁺.

[X²⁺] (at the cathode) = 1.521 mol L^-1

[X²⁺] (at the anode) = 0.007 mol L^-1

You have 5 attempts at this question

4--Which of the following metals will dissolve in a solution containing 1 mol L^-1 H⁺ ?

Select as many answers as are correct, however points will be deducted for incorrect guesses.

Select one or more:

Mn

Au

Zn

Cu

Mg

Ag

5--What is E°_cell (in V) for a redox reaction that has Δ_rG° = -613 kJ mol^-1 at 25°C ? Assume 3 electrons are transferred in the balanced redox reaction.

6-What is the E°_cell (in V) for a redox reaction that has equilibrium constant K =7.8 x 10^-2 at 25°C ? Assume 1 electrons are transferred in the balanced redox reaction.

Remember: if you want to express an answer in scientific notation, use the letter "E". For example "4.32 x 10⁴" should be entered as "4.32E4".

7--Consider a hypothetical salt of low solubility, "MX", where M⁺ is a metal cation and X^- is a non-metal anion.

A voltaic cell was set up with a cathode containing metal "M" immersed in a solution containing M⁺ at a concentration of 1.00 mol L^-1. The anode consisted of metal "M" immersed in a saturated solution of "MX".

The measured cell voltage was 0.255 V.

What is the K_sp of "MX" at 25°C ?

Remember: if you want to express an answer in scientific notation, use the letter "E". For example "4.32 x 10⁴" should be entered as "4.32E4".

8--What is E_cell for the following hypothetical reaction exactly as written (in volts) at T = 25°C given the conditions below? Express your answer to 2 decimal places.

X_(s) + 2 Y⁺_(aq) → X²⁺_(aq) + 2 Y_(s)

E°_cell = 0.70 V

[Y⁺] = 0.005 mol L^-1

[X²⁺] = 1.93 mol L^-1

^9--What is E_cell for the following hypothetical reaction exactly as written (in volts) at T = 25°C given the conditions below? Express your answer to 2 decimal places.

2 X_(s) + Y²⁺_(aq) → 2 X⁺_(aq) + Y_(s)

E°_cell = -0.75 V

[Y²⁺] = 0.004 mol L^-1

[X⁺] = 1.62 mol L^-1

^10-Balance the following redox reaction in acidic solution by inputting the correct coefficients.

I^- + NO₂^-→ I₂ + NO

If H⁺ or H₂O is not present as reactant or product, select "0" as the coefficient for the purposes of this question. You must also explicitly label a coefficient as "1" if only one molecule is present.

Important: You MUST simplify all "like terms" on both sides of the chemical equation before selecting your answer: having the same compound on both sides of the equation will be marked incorrect.

*The products are listed below the reactants so the whole equations fits on your computer screens better *

0123456789 I^- +  0123456789 NO₂^- +  0123456789 H⁺ +  0123456789 H₂O

↓

0123456789 I₂ +  0123456789 NO +  0123456789 H⁺ +  0123456789 H₂O

Answer 1

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