Chapter 19, Problem 19.7QP

Interpretation Introduction

Interpretation: The half –cell reaction occurs in redox process and the half-cell reaction should be differentiate.

Concept Introduction:

• Half-cell Reaction:

  A half-cell is one of the two electrodes in a galvanic cell or simple battery.

  Example, the Zn-Cu battery, the two half cells make an oxidizing couple.

  Placing a piece of reactant in an electrolyte solution makes a half cell. Unless it is connected to another half-cell via an electric conductor and salt bridge, no reaction will takes place in a half cell.

• Redox reaction are those in which oxidation number changes.
• Half reaction are the separated oxidation and reduction reaction that make up the overall redox reaction.

  Example, the Zn-Cu battery, the two half cells make an oxidizing couple.

• Redox equation can be balanced via the half –reaction methods, which allows for the addition of ${\text{H}}_{2}O$ balancing O ${\text{H}}^{+}$ to balance H, and ${\text{OH}}^{-}$ for taking place in basic solution.
• The electromotive force (EMF) is the maximum potential difference between two electrodes of a galvanic or voltaic cell. This quantity is related to the tendency for an element, a compound or an ion to acquire (gain) or release (loss) electrons.