Final answer:
The chemical formulas for various compounds are derived from the names of the compounds using systematic rules based on their charges and prefixes that indicate their composition. Some examples include chromium(III) phosphide (CrP), and chlorine monofluoride (ClF).
Step-by-step explanation:
Writing chemical formulas for compounds is an essential skill in chemistry. For ionic compounds, the formula is based on the charges of the ions. For example:
- Chromium(III) phosphide: CrP
- Mercury(II) sulfide: HgS
- Manganese(II) phosphate: Mn3(PO4)2
- Copper(I) oxide: Cu2O
- Iron (III) chloride dihydrate: FeCl3 · 2H2O
For molecular compounds, the formula is determined by the prefixes and elements' names:
- Chlorine monofluoride: ClF
- Dihydrogen monosulfide: H2S
- Carbon tetrabromide: CBr4
- Bromine: Br2 (since it is a diatomic molecule)
For binary ionic compounds, we use the charges from each element:
- Cesium fluoride: CsF
- Calcium sulfide: CaS