So for my lab report I need to write a hypothesis on calorimetry and specific heat. For this lab we explore how the specific heat of a substance can be determined using a coffee cup calorimeter.

it is the most commonly accepted one

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.