“What are you doing tomorrow for Future Ready Day?” Good Afternoon! “What are you doing tomorrow for Future Ready Day?” Please grab: Naming Grid W.S (yellow) Foldable WS (white) Homework Log

Test Summary Averages 4th = % 5th = % 7th = % I may drop 1 or 2 problems, I’ll let you know. Retakes mandatory for 70% and below AFTER test corrections Test Corrections Begin Next Week! Averages 4th = % 5th = % 7th = %

Homework Log… Unit 2: Nuclear Reactions Unit 3: Naming Make a Reflection Statement Unit 3: Naming Make a goal for how you will be successful in Unit 3. What is your plan? When you are done, put your homework log away. 

Naming Ionic Compounds Simple Ionic Compounds, Type II Ionic Compounds, Polyatomics

Why is it important to know how to name a chemical? KCl – Potassium Chloride In fertilizers Alternate to NaCl, in water softeners and table salt Lethal Injection (in high concentrations) KClO3 – Potassium Chlorate Pesticides Generate oxygen on air & space craft Propellant for gun powder/explosives Different Name = Different Properties

This determines how many of each atom goes into each ionic compounds! Big Idea! Compounds like to be neutral! So the combined charges of the two elements must be neutral (ex: Na + and Cl-) This determines how many of each atom goes into each ionic compounds!

Example 1: Barium and Oxygen BaO – Barium Oxide Barium has 2 electrons that it is giving away and Oxygen has 6 valence electrons and wants to take 2 electrons to fill its valence shell.

Example 2: Sodium and Oxygen The subscript tell us how many of that atom we have. The ionic compound wants to be neutral—that charges are wiping each other out. Na2O – Sodium Oxide 2 of THAT atom

Example 3: Aluminum & Sulfur Al2S3 – Aluminum Sulfide 2 aluminum Hint: To make the compound neutral…. Look for the least common multiple and make the overall charge of each ion equal to this 6+ vs 6-

Writing Formulas Easy way: The charge on the cation becomes the subscript on the anion. The charge on the anion becomes the subscript on the cation. If these subscripts are not in the lowest whole-number ratio, divide them by the greatest common factor. Cation is positive. Anion is negative.

Write small! We will be adding a chemical name too! Practice Time On the white grid, fill in the chemical formulas in the first 5 boxes (there are little numbers in the boxes) Write small! We will be adding a chemical name too!

Naming Rules for Simple Ionic Compounds

Helpful Reminders Metals =Losers Positive = Ca+ions Non-Metals =Thieves (Takers) Neg = Anions - + Many metals and non-metals have predictable charges- let’s label our periodic tables now!

Writing and Naming Simple Ionic Compounds Example: Sodium & Oxygen Na2O Sodium Oxide 1) Metal first and keep their name 2) Non-metal is 2nd and ends in – ide (POLYATOMIC ION NAMES DO NOT CHANGE!) 3) Total charge must = Ø 4) Subscripts = number of atoms 5) Reduce subscripts Use atom puzzle pieces 2+ 2- Ø

You try writing the formula: 1. Potassium & phosphorus 2. Calcium and Bromine K3P CaBr2 Now name them! Potassium Phosphide Calcium Bromide

Exit Task You try writing the formula and name : NaI - Sodium Iodide Mg3N2 – Magnesium Nitride AlF3- Aluminum Fluoride BaS - Barium Sulfide Sodium & Iodine Magnesium & Nitrogen Aluminum & Fluorine Barium & Sulfur