What chemical is needed for respiration?

The chemical name starts with an s and contains 5 letters

SUGAR (not a chemical) !

Explanation:-

Glucose is the main source of energy The mitrochondria in the cellular respiration converts glucose into ATP The process through which it is converted to the ATP and pyruvate Pyruvate than enter the citric acid cycle and generate water and carbon dioxide Carbon dioxide gets absorbed in the blood and expelled out of the body