Chapter 3C - Electrochemical Series
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What is the electrochemical series?
• list of chemical species arranged in order of their strength as oxidants & reductants • list of half equations
What does the forwards reaction in the electrochemical series represent?
• reduction reaction
What does the reverse reaction in the electrochemical series represent?
• oxidation reaction
What are the features of the Electrochemical series?
• valid only under standard conditions
Definition - strong reductants
• donate electrons more readily than weak ones (anode/oxidation) • have weak conjugate oxidants
Definition - strong oxidants
• accept electrons more readily than weak ones • have weak conjugate reductants
What are the limitations of the electrochemical series?
• doesn’t indicate reaction rate • only valid under standard conditions • formation of oxide changes reactivity
What is the Standard Hydrogen Electrode?
• other half-cells are compared • determines oxidant and reductant strengths of other half cells • standard electrode potention of 0.00
What are spontaneous redox reactions?
• occur directly • exothermic • chemical energy is transformed into heat energy
What are the reactions that occur in galvanic cells?
• spontaneous redox reactions • exothermic • chemical energy is transformed into electrical energy