Does the equation describe a chemical change or a physical change? Explain your reasoning. C17H17ON3(s) + 2C4H6O3(l) - -> C21H21O5N(s) + 2C2H4O2(l)

The molecular formula for caffeine is cshion402. which of the following elements is not found in caffeine?

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

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