How to Write the Formula for Potassium manganate скачать в хорошем качестве

How to Write the Formula for Potassium manganate

In this video we'll write the correct formula for Potassium manganate (K2MnO4). To write the formula for Potassium manganate we’ll use the Periodic Table, a Common Ion Table, and follow some simple rules. Because Potassium manganate has a polyatomic ion (the group of non-metals after the metal) we'll need to use a table of names for common polyatomic ions, in addition to the Periodic Table. Keys for Writing Formulas for Ternary Ionic Compounds: 1. Write the element symbol for the metal and its charge using Periodic Table. 2. Find the name and charge of the polyatomic ion on the Common Ion Table (see    • Figuring out the Charge on Ions  ). 3. See if the charges are balanced (if they are you're done!) 4. Add subscripts (if necessary) so the charge for the entire compound is zero. 5. Use the crisscross method to check your work. Notes: Don't write the subscript '1'. If you use the criss-cross method and end up with something like Ca2S2 you'll need to reduce the subscripts to Ca1S1 which we write CaS. Note: It is possible to have two polyatomic ions such as NH4NO3. In this case find and write both names as found on the Common Ion Table. --Formula Writing Resources-- Finding Ionic Charge:    • Figuring out the Charge on Ions   Memorizing Polyatomic Ions:    • Memorizing and Using the List of Polyatomi...   Criss-Cross Method:    • The Criss-Cross Method for Writing Chemica...   For a complete tutorial on naming and formula writing for compounds, like Potassium manganate and more, visit: http://www.breslyn.org/chemistry/naming Drawing/writing done in InkScape (http://www.InkScape.org). Screen capture done with Camtasia Studio 8.0