The half reactions are the two parts of the equation that can be shown separately and still make sense. In this case, it will be:
Cl2 + 2e- → 2Cl-
Li → Li+ + e-
You will see that I have added the electrons to the sides that are required to balance the equations, because chlorine gains electrons going from neutral to -, and lithium loses an electron going from neutral to +.
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The half reactions are the two parts of the equation that can be shown separately and still make sense. In this case, it will be:
Cl2 + 2e- → 2Cl-
Li → Li+ + e-
You will see that I have added the electrons to the sides that are required to balance the equations, because chlorine gains electrons going from neutral to -, and lithium loses an electron going from neutral to +.