A sample of mercury(II) oxide was heated to produce mercury metal and oxygen gas. Then the liquid mercury
was cooled to -40°C, where it solidified. A glowing wood
splint was thrust into the oxygen, and the splint burst into flame. Identify each physical change and each chemical change.

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.