Is respiration a physical or chemical change?

Why is respiration chemical change?

  • Answer:

    Yes, it is purely chemical. To put it simply: carbohydrates (in body) with oxygen (inhaled) become carbon dioxide (exhaled) and water (exhaled and excreated). These are all different chemical substances, so this is a chemical change. (There are also other types of respiration, even without oxygen, but they all are chemical!)

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