Difference between revisions of "Half Equation"
| Line 11: | Line 11: | ||
[[Balanced Symbol Equation]]: 4Li + O<sub>2</sub> → 2Li<sub>2</sub>O | [[Balanced Symbol Equation]]: 4Li + O<sub>2</sub> → 2Li<sub>2</sub>O | ||
| − | '''Half | + | '''Half Equation''' at [[cathode]]: Li<sup>+</sup> + e<sup>-</sup> → Li |
| − | + | '''Half Equation''' at [[anode]]: 2O<sup>-2</sup> → O<sub>2</sub> + 4e<sup>-</sup> | |
| − | |||
| − | 2O<sup>-2</sup> → O<sub>2</sub> + 4e<sup>-</sup> | ||
Revision as of 07:03, 3 January 2019
Key Stage 4
Meaning
A half equation is a type of symbol equation which shows how individual ions gain or lose electrons at an electrode during electrolysis.
About Half Equations
- In half equations only one ion is considered at a time, or the changes at one electrode.
- Half equations use the letter 'e' to represent electrons.
- Half equations can be taken from balanced symbol equations.
Examples
Balanced Symbol Equation: 4Li + O2 → 2Li2O
Half Equation at cathode: Li+ + e- → Li
Half Equation at anode: 2O-2 → O2 + 4e-