Phosphorus occurs naturally in the form of fluorapatite, CaF2 3Ca3(PO4)2, where the dot indicates 1 part CaF2 to 3 parts Ca3(PO4)2. This mineral is reacted with an aqueous solution of sulfuric acid in the preparation of a fertilizer. The products are phosphoric acid, hydrogen fluoride, and gypsum, CaSO4 2H2O. Write and balance the chemical equation describing this process.
Chapter 2 Atoms and Elements 2.1 Imaging and Moving Individual Atoms Scanning tunnel microscopy (STM) – A technique that can image (make a visual representation of), and even more, individual atoms & molecules. o Works by moving an extremely sharp electrode (a conductor through which electricity can enter or leave) over a surface and measuring the resulting tunneling current, the electrical current that flows between the tip of the electrode and the surface even though the two are no in physical contact. Tunneling current is extremely sensitive to distance, making it possible to maintain a precise separation between the electrode tip and the surface by moving t