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.
Question I. What is the formula for the ionic compound formed by magnesium and iodine? Question II. If a compound has its formula XBr3 and another compound has its formula Na2Y, what is the formula of a compound that consists of X and Y? I: MgI II: Al2O3 I: Mg2I II: K2O I: MgI2 II: Ga2S3 I: MgI3 II: Al3O2 I: MgI2 II: GaO3. OR.