A 20.0 g lead ball is heated in a Bunsen burner to 705 degrees C. It is then dropped into a 500.0 g water bath. What is the initial temperature of the water if the final temperature is 35 degrees celsius? The Cp of lead is 0.13 J/g degrees Celsius.

What is the energy lost of the metal?
What is the waters temperature change?
What was the waters initial temp?

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.