A pencil has about 2.7 grams of graphite(carbon) in it. How many carbon atoms is this?

Which of these best describes an ionic bond?

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

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.