Summarize at least three steps needed to carry out Galileo’s famous experiment to determine whether heavier objects fall faster than lighter objects. Include the question and hypothesis.

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.

the answer is d. matter from the air combined with the steel wool.