When 1.23 g of KClO3 was added to 150.0 g of water in a calorimeter, the temperature went down 0.65°C. The specific heat capacity of H2O is 4.18 J/g°C. Assume the specific heat of the solution equals that of H2O because it is mostly water. How much heat is released?

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

increased stability in the completion of fluorine's outer shell.

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.