Which of the following chemical compounds contains two hydrogen atoms in every molecule?
a.
water (h2o)
b.
molecular oxygen (o2)
c.
carbon dioxide (co2)
d.
calcium carbonate (caco3)

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

0.09 moles of sodium sulfate in 12 ml of solution

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.