Which of the following statements concerning ionic compounds is true?
A)Essentially all ionic compounds are solids at room temperature and pressure.
B)Ionic compounds do not contain any covalent bonds.
C)Ionic compounds contain the same number of positive ions as negative ions.
D)The chemical formula for an ionic compound must show a nonzero net charge.

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.