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:

Hello,

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.

Best regards.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.