Which of these observations about a crystalline solid material is the best indication that the material is a pure substance? a the substance is composed entirely of white crystals. b the substance dissolves completely in water. c the substance melts over a narrow temperature range. d the substance does not vary widely in crystal size.

What statement goes against the kinetic theory of gases

Correct relationship between molecular formula and empirical formula

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.