Disorder in the universe increases because
a. spontaneous changes produce more order in a system.
b. work produces disorder in a system.
c. work produces waste heat, which leaves a system.
d. all of the above

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

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