Difference between revisions of "Half Equation"
(Created page with "==Key Stage 4== ===Meaning=== A '''half equation''' is a type of symbol equation which shows how individual ions gain or lose electrons in...") |
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==Key Stage 4== | ==Key Stage 4== | ||
===Meaning=== | ===Meaning=== | ||
| − | A '''half equation''' is a type of [[Balanced Symbol Equation|symbol equation]] which shows how individual [[ion]]s gain or lose [[electron]]s | + | A '''half equation''' is a type of [[Balanced Symbol Equation|symbol equation]] which shows how individual [[ion]]s gain or lose [[electron]]s at an [[electrode]] during [[electrolysis]]. |
===About Half Equations=== | ===About Half Equations=== | ||
| − | : In '''half equations''' only one [[ion]] is considered at a time. | + | : 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 [[electron]]s. | : '''Half equations''' use the letter 'e' to represent [[electron]]s. | ||
: '''Half equations''' can be taken from [[Balanced Symbol Equation|balanced symbol equations]]. | : '''Half equations''' can be taken from [[Balanced Symbol Equation|balanced symbol equations]]. | ||
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'''Half Equations''' | '''Half Equations''' | ||
| − | + | Li<sup>+</sup> + e<sup>-</sup> → Li | |
| − | O<sub>2</sub> + 4e<sup>- | + | 2O<sup>-2</sup> → O<sub>2</sub> + 4e<sup>-</sup> |
Revision as of 07:02, 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 Equations
Li+ + e- → Li
2O-2 → O2 + 4e-