Which item dose not contain a noble gas flash camera or mp3 p[layer

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

From the options provided for each element below, choose the properties that it may have based on its location in the periodic table fluorine (f): highly reactive nonmetal shiny a conductor

Identify the lewis acid in this balanced equation: ag+ + 2nh3 -> ag(nh3)2+a. ag+b. nh3c. ag(nh3)2+