1. Chapter 6 Notes part III Covalent Compounds

2. Covalent (Molecular) Compounds So far, we have only talked about ionic compounds; compounds made of a metal and nonmetal.

3. Covalent (Molecular) Compounds A covalent compound forms between two nonmetals. These compounds occur because the nonmetals will share electrons to have a full last energy level.

4. Covalent (Molecular) Compounds Since electrons are not lost or gained, the atoms are not considered ions, so they do not have a charge.

5. Naming Covalents Because covalent compounds aren’t made of ions, you can’t use the oxidation number to predict how many atoms of each element are going to be in a covalent compound.

6. Naming Covalents mono-onehexa-six di-twohepta-seven tri-threeocta-eight tetra-fournona-nine penta-fivedeca-ten The following prefixes will be used.

7. Naming Covalents 1)Name the first element in the compound, and use a prefix if there is more than one of the element. EX: CO 2 EX: CO carbon

8. Naming Covalents 2)Name the second element, end in –ide, and put a prefix at the beginning even if there is only one. EX: CO carbon oxide 2 di “understood one” 1 mon

9. Naming Covalents EX: N O 25 nitrogenoxideDipent

10. Name These: SO 2 NO Cl 2 S BCl 3 P 2 S 7 Sulfur dioxide Nitrogen monoxide Dichlorine monosulfide Boron trichloride Diphosphorus pentasulfide

11. Writing Molecular Formulas 1) Write the symbol for the 1 st element and use the prefix to determine the subscript. EX: nitrogenDisulfidepentanitrogensulfideDi N 2 sulfidepenta

12. Writing Molecular Formulas 2) Write the symbol for the 2 nd element and use the prefix to determine the subscript. EX: nitrogenDisulfidepentanitrogensulfideDi N 2 sulfidepenta S 5

13. Name These: Carbon tetrachloride Dinitrogen heptoxide Carbon monoxide Dichlorine monoxide Trisilicon decaoxide SO 2 N2O7N2O7 CO Cl 2 O Si 3 O 10