Half Equations & Ionic Equations (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards

Oxidation or reduction processes in redox reactions

How electrons are transferred

Loss of electrons

Gain of electrons

$\text{Na} \rightarrow \text{Na}^+ + e^-$

$\text{Cl}_2 + 2e^- \rightarrow 2\text{Cl}^-$

Electrons lost must equal electrons gained

Only species directly involved in the reaction

Ions that do not change during the reaction

They are omitted

Write the balanced chemical equation

$\text{Na}^+$ and $\text{NO}_3^-$