Which of the following are included in the conditions that an electrochemical ce

Question

Which of the following are included in the conditions that an electrochemical cell must meet if it is a standard electrochemical cell? All solutes in aqueous solution have a concentration of 1 M. All gaseous reactants or products have a pressure of 1 bar. All solids are present in quantities of 1 mole. 1 only 2 only 3 only 1 and 2 1, 2, and 3 For a reaction in a voltaic cell, both and deltaSdegree are negative. Which ONE of the following statements is true? F_ein will increase with an increase In temperature. E_ceil will not change when the temperature increases. E_ceii will decrease with an increase in temperature. deltagdegree0 for all temperatures. None of the above statements is true.

Explanation / Answer

For your first question, A cell's standard state potential is the potential of the cell under standard state conditions, which is approximated with concentrations of 1 mole per liter (1 M) and pressures of 1 atmosphere at 25oC. (1 atm is near 1 bar) so we can say that only 1 and 2 applies here.

For the second question, E° cell is the standard reduction potential of the cell, and this value depends of the respective E° of reduction and oxidation from the cathode and anode. This values are tabulated and they will not change even if temperature change. The only thing that change with temperature is the cell potential E (or Ecell). Therefore, according to this, the option B will be the one that is true. The remaining options are false.

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