What mass of a 500. gram sample of plutonium-239 will remain after 4 half-lives?

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.

Which three statements represent the benefits of performing experiments using computer simulations?

What mass of ca(oh)2 is needed to make 1250ml of a .75m solution?