Help with chemistry, 50 points

Thank you

I didn't wait because there is someone who will take it and there is someone who answer a wrong answer

Explanation:

if you mean hydrogen and oxygen then water is the product

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.