Which of the following is an example of a longitudinal wave? A. A wave traveling down a long, stretched string, with both ends held
fixed.
B. A wave on the surface of a drum that has been struck.
C. A wave traveling down a stretched Slinky toy, with both ends held
fixed.
D. A wave of ocean water as it reaches the beach.

c. 75.7

i think that is the right

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante

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.