Why are metals good conductors of heat and electricity?
a.) anions rotate around the stationary electrons
b.) cations rotate around the stationary electrons
c.) free moving atoms in metals carry both heat and electric current
d.) free moving electrons in metals carry both heat and electric current free moving protons in metals carry both heat and electric current

Idon’t know how to solve this question

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.

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false