1. Naming Compounds and Writing Formulas
Chemistry
Naming Compounds and Writing Formulas

2. What is a Compound?
A compound is made up of more than one element chemically bonded. For example: H2O

3. What is a Chemical Formula?
A chemical formula shows the number of each atoms of each element present in a compound

4. So, how do we write chemical formulas?
We must first decide what type of compound is present!

5. What types of compounds are there?
The three we will discuss are:
Ionic
Covalent
Acids

6. How to write an Ionic formula?
We use the Swap n’ Drop Method!

7. The Swap n’ Drop Method?
1)List the ions given side by side * The cation (metal) always goes first * The anion (non-metal) goes second 2)Swap the numbers to the other element 3)Drop the charge 4)Reduce if possible

8. For example,
Aluminum and oxygen

9. Let’s try together Magnesium and iodine Cesium and sulfur
Strontium and oxygen

10. On your own,
Aluminum and Chlorine
Calcium and nitrogen

11. With a partner,
Complete the top half of the worksheet

12. Rules for Swap n’ Drop Keep your (family) together
Only Ionic compounds can reduce

13. Naming flow chart