The formula for cellular respiration is as follows: glucose oxygen carbon dioxide + water. In a class demonstration, Mrs. Nakaguchi takes a sugar packet and pours it on your desk. She then points a fan at the tiny mound of glucose supplying it with plenty of oxygen. "There we go, we are combining sugar with oxygen!" exclaims the teacher. The class eagerly waits...for nothing. You had the reactants necessary for cellular respiration, so why did nothing happen?