1. Unit B Section 3.0 Chemical Compounds

2. 3.1 - Naming Compounds ► Molecular Compounds (Compounds with nonmetals only): 1. Write the name of each element that is present 2. Change the end of the second element to “-ide” 3. Use prefixes to indicate the number of atoms of each element that is present

3. ► Ionic Compounds (Compounds with a metal and a nonmetal): 1. Write the name of the metal and the nonmetal 2. Change the ending of the nonmetal name to “-ide” 3. If the metal is one that has more than one possible charge, indicate the charge value using a roman numeral

4. 3.2 – Ionic Compounds ► Ionic compounds are formed from charged ions that are attracted to each other ► Ions form when metals give away electrons to become positive, or when nonmetals gain electrons to become negative ► Therefore, when two elements react to form an ionic compound, the metal donates its electrons (becoming positive) and the nonmetal accepts those electrons (becoming negative)

5. Properties of Ionic Compounds

6. 3.3 – Molecular Compounds ► Molecular compounds form when two nonmetal elements bond together ► The bond in a molecular compound is formed when the two nonmetals share electrons between them

7. Why Share? ► Atoms want to have 8 electrons present in their outer energy level (think of the Bohr model of the atom) ► Nonmetals can obtain 8 if they share electrons ► For instance, oxygen has 6 electrons, and carbon has 4…

8. Carbon monoxide & carbon dioxide

9. Properties of Molecular Compounds