Bring the water to a boil, then turn the heat to medium-low and cover the pot with a lid. Steam the tamales for up to 2 hours or until the masa dough is firm. Check the level of water from time to time and do not let it run dry. Allow the tamales to cool for at least 5 minutes before unwrapping them for serving.
Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. Arsenic is a metalloid. It can exist in various allotropes, although only the gray form has important use in industry.he most common oxidation states for arsenic are: â3 in the arsenides, such as alloy-like intermetallic compounds; and +3 in the arsenites, arsenates(III), and most organoarsenic compounds. Arsenic also bonds readily to itself as seen in the square As 3â 4 ions in the mineral skutterudite.
In its metallic form it is bright, silver-grey and brittle. Uses. Arsenic is a well-known poison. Arsenic compounds are sometimes used as rat poisons and insecticides but their use is strictly controlled.rsenic doesn't seem much like a metal in its so called yellow form, but it also has a grey form known tellingly as metallic arsenic. Yellow arsenic has a specific gravity of 1.97 while grey arsenic has a specific gravity of 5.73. Grey arsenic is the usual stable form with a melting point of 817 degree Celsius.