Visible light is a by-product of fusion, it is created when two atoms such as hydrogen atoms fuse together to make a larger element, this releases enormous amounts of energy in many forms.
Including but not limited to: Light, heat and everything on the electromagnetic spectrum.
reactant
This depends on the reaction involved.
Reactant
sulfur is a reactant
Oxygen is a reactant
product
Sugar can be both a reactant and a product, depending on the chemical reaction. For example, in the process of photosynthesis, sugar (glucose) is produced as a product. However, in the process of fermentation, sugar is a reactant that is broken down to produce other products like ethanol and carbon dioxide.
Reactant- glucose and product- carbon dioxide.
No, carbon dioxide is a reactant in photosynthesis.
Glucose is a product of photosynthesis and a reactant in cellular respiration.
For copper, it is an element. It could be both reactant and product. While purifying copper will be the product. But copper would be the reactant in case of preparing hydrogen or copper sulphate salts.
Chlorine can be both a reactant and a product, depending on the chemical reaction it is involved in. It can react with other substances to form new compounds as a reactant, or it can be generated as a product from certain reactions.