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.
Best Answer: The chemical formula for Iron (III) Chloride is FeCl3. Chlorine is a halogen and will very easily form the Chloride ion by picking up one electrons from something else. The Chloride ion has a -1 charge. In order to balance the +3 charge on the Iron ion (Fe+3), 3 Chloride ions (Cl-) are needed. Fe+3 + 3Cl- --> FeCl3. +3 + 3(-1) = 3 + -3 = 0 for an overall neutral compound.