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.
What is the formula for cesium sulfide? Antimony pentasulfide may be obtained from the reaction of sulfur with antimony in an inert atmosphere at temperatures between 250 to 400 degrees Celsius. It reacts with strong acids to produce hydrogen sulfide, sulfur and other salts.