PLEASE HELP ! Question 1
Recall all the models you described in task 1. Think about the results each model would predict for the
experiment with hydrogen gas. Which models of the atom does the experimental evidence support?
Explain why these models are compatible with the experimental results.

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.