Early wheels were simple wooden disks with a hole for the axle. In the early Roman empire, most horse-carts used a design featuring two chords across the wheel. The spoked wheel was invented much more recently, and allowed the construction of lighter and swifter vehicles.
Chromium(III) sulfide. Chromium(III) Sulfide is the inorganic compound with the formula Cr2S3. It is a brown-black solid. Chromium sulfides are usually nonstoichiometric compounds, with formulas ranging from CrS to Cr0.67S (corresponding to Cr2S3). Preparation.
Quick Answer. In chemistry, Fe(ClO3)3 is the molecular formula for the compound iron(III) chlorate. The formula uses symbols to represent each element in the compound, with Fe for iron, Cl for chlorine and O for oxygen. In a chemical formula, the number directly after the element indicates the number of atoms of that element in a single molecule of the compound.