Is anyone good at chemistry if so can someone help me please. NO LINKS! what is true of the mass numbers of the Parent and her daughter atoms in beta minus decay ?

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.

window cleaner is ammonia dissolved in water. this is an example of a