In a hydrogen fuel cell, hydrogen gas and oxygen gas are combined to form water. Write the balanced chemical equation describing this reaction using the lowest whole‑number coefficients. classify each reaction as a redox reaction or a non‐redox reaction. redox non‐redox

Redox reaction.

Explanation:

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In this case, the required chemical reaction is:

Which balanced is:

Thus, if we write the oxidation numbers:

Hence we evidence how the hydrogen is oxidized from 0 +1 and oxygen is reduced from 0 to -2, therefore the hydrogen is a reducing agent and the oxygen is an oxidizing agent. Thereby, this is a redox reaction.

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