Can someone solve this please

Does the energy in a solid increase or decrease when changing to a liquid?

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

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.