What Are The Reactants In The Equation For Cellular Respiration? : Chapter 7 Concept 7 4 . Cellular respiration is a metabolic pathway that breaks down glucose and produces atp. Cellular respiration occurs when oxygen and food (glucose) react to form carbon dioxide and water. Reactants, glucose and oxygen, glucose. Reactants, c6h12o6 and 6o2, 6co2 and 12h2o and light energy. Write the formula equation showing all reactants and products. Chemical equation for respiration c6h12o6 + 6o2 → 6co2 + 6h2o + e (reactants) (products). Reactants are the molecules that begin cellular respiration, in this case that . The reactants for photosynthesis are light energy, water, carbon dioxide and chlorophyll, while the products are glucose (sugar), . Reactants, c6h12o6 and 6o2, 6co2 and 12h2o and light energy. Glucose is a simple carbohydrate with the chemical formula c6h12 . 5 1 Overview Of Photosynthesi