Examine Chemical Formula

1. Summary: “Given Chemical Formula, What is the Name?” Examine Chemical Formula Nonmetal + Nonmetal? Metal + Nonmetal? Formula begins with H and ends with “(aq)”? Molecular (Covalent) Naming Name according to ionic rules… Acid Naming Is it a common chemical (i.e. NH3, H2O)? How many different elements? No… Yes! At least 3, one of which is Oxygen Just 2 Is it a diatomic molecule? (HON F. BrICl) Use Common Name i.e. ammonia Binary Acid Rules Oxyacid Rules No… Yes! Is H the first atom in the formula? Name is the element i.e. F2 = fluorine molecule Derive name from polyatomic ion with suffix* (i.e. “-ic”) + “acid” i.e. H2SO4(aq) is “sulfuric acid” “hydro” + second element root +“ic” acid i.e. HCl(aq) is “hydrochloric acid” Yes! No… Name using prefix according to the number of each atom *(omit “mono” for first part of name!)* * If polyatomic ion ended in –ate, replace it with –ic If polyatomic ion ended in –ite, replace it with –ous No Prefixes – name is just “Hydrogen _____ide”

2. Summary: “Given Name, What is the Chemical Formula?” Does name end with “acid”? Yes! No… Does it start with “hydro”? Is the name just an element? Yes! Yes! It’s a diatomic molecule… No… Identify ions, use cross-over method (cation will always be H+). Add (aq). No… Is it a common name? i.e. water, methane, etc. Yes! Well then, good thing you memorized the formula! No… Does the first part of the name end with “–ic” or “–ous”? Does the name start with “hydrogen”? Yes! Identify ions, then use cross-over method Yes! No… No… Identify ions and use cross-over method (ions will always be H+ and some polyatomic ion). Add (aq) Are there prefixes in the name? i.e. mono, di, etc… Yes! Use prefixes to tell you the number of atoms of each element (molecular) No…