Oxygen is a by-product of photosynthesis thus it is not needed for photosynthesis to occur.
Light is needed to provide the energy needed as photosynthesis is endothermic and is also needed to ionise the water molecule to get hydroxide and hydrogen ions and carbon dioxide is what is reduced to starch.
Titration is a common method of determining the amount or concentration of an unknown substance. The method is easy to use if the quantitative relationship between two reacting solutions is known. The method is particularly well-suited to acid-base and oxidation-reduction reactions. Titrations are routinely used in industry to analyze products to be sold. Many manufacturers are under strict standards of quality control because their products are sold for public consumption. In this experiment, we will analyze a number of commercial products and, in some cases, test the validity of the information given on their labels and/or the claims made in television commercials. The products to be tested include antacid tablets, vinegar, fruit juice, and household ammonia.
Just want to help you understand :)) If you need any more help comment on this and I will be glad to help :D
Protons and electrons.
Side note: Neutron numbers may vary due to existence of istopes ((molecules that have the same number of protons (therefore its the same element) but different number of protons))
The answer should be law of conservation of energy
