Naming and Writing Chemical Compounds Physical Science

DAY 12

Explain why you put subscripts in chemical formulas. Activator Explain why you put subscripts in chemical formulas.

Aqua Rules American Rules no Roman no Greek

Aqua Name Write element names and change ending of second element to –ide. Example: Na2O  Sodium oxide

Na2O Aqua Formulas Na1+ O2- Na1+ It take 2 Na1+ to balance 1 O2- Balance positive and negative charges, then add subscripts Example: Na1+ Na2O O2- Na1+ It take 2 Na1+ to balance 1 O2-

Red Rules Roman Rules Roman numerals are the positive oxidation number for the transition metals (“the valley varies”)

Red Name Write element names and change ending of second element to –ide. Use the roman grid to find the red oxidation number and write as Roman Numeral.

Red Formulas Oxidation number for Iron (III) = 3+ O2- Fe3+ Get oxidation number for red element from Roman Numeral, balance charges, and write subscripts. Example: Iron (III) oxide Oxidation number for Iron (III) = 3+ O2- Fe3+ It takes 2 Fe3+ and 3 O2- to balance positive and negative charges  Fe2O3 O2- Fe3+ O2-

Green Rules Greek Rules Greek prefixes in name

Greek Prefixes One mono Two di Three tri Four tetra Five penta Six hexa Seven hepta Eight octa Nine nana Ten deca

Green Name Turn subscripts into Greek prefixes in front of element names (do not use mono- on the first element). Change ending of second element to –ide. Example: CO2  Carbon dioxide CO  Carbon monoxide

Green Formula Turn Greek prefixes into formula subscripts. Do not try to balance charges. Example: Carbon tetrachloride  CCl4

Ticket out the Door Name the following on a sheet of paper: 1. NaCl 2. AlI3 3. NiO 4. Ni2O3 NaF Write the following equations: 1. Iron (II) chloride 2. Sodium chloride

Right or wrong? If the formula is incorrect, write the correct formula: LiF2 KBr MgCl AlO2

Ticket Out The Door Write formulas and name the following: Na bonded with P Ca bonded with N Cs bonded with Se Ba bonded with Br Li bonded with I

Ticket Out the Door Name the following: 1. NaCl 2. AlI3 3. NiO 4. Ni2O3 5. NaF