1. Naming Covalent Compounds When it is all NONMETALS

2. Compounds vs Molecules A Compound is any substance composed of two or more DIFFERENT elements. A Compound is any substance composed of two or more DIFFERENT elements. A Molecule is any substance composed of two or more atoms COVALENTLY BONDED. A Molecule is any substance composed of two or more atoms COVALENTLY BONDED.

3. Properties of Covalent Compounds Generally Low Melting and Boiling Points Generally Low Melting and Boiling Points Generally Soft and Flexible Generally Soft and Flexible Tend to be Flammable Tend to be Flammable Don’t conduct electricity Don’t conduct electricity Normally won’t dissolve in water Normally won’t dissolve in water

4. Types of Covalent Bonds Formed between two nonmetals in 14, 15, 16, and 17 Formed between two nonmetals in 14, 15, 16, and 17 Nonmetals have high electronegativity values Nonmetals have high electronegativity values Electrons are shared Electrons are shared single bond shares one pair electrons double bond shares two pairs electrons triple bond shares three pairs electrons

5. Diatomic Elements Gases that exist as diatomic molecules are H 2, F 2, N 2, O 2, Cl 2, Br 2, I 2 They are simply given their elements name. They are simply given their elements name. Exist this way only when not in compounds Exist this way only when not in compounds

6. Learning Check Use the name of the element to name the following diatomic molecules. H 2 hydrogen N 2 nitrogen Cl 2 _______________ O 2 _______________ I 2 _______________

7. Naming Covalent Compounds Two nonmetals Name each element Name each element End the last element in -ide End the last element in -ide Add prefixes to show more than 1 atom Add prefixes to show more than 1 atomPrefixes mon1 hexa6 di2hepta7 tri3octa8 tetra4nona9 penta5deca10

8. Learning check Fill in the blanks to complete the following names of covalent compounds. CO carbon ______oxide CO 2 carbon _______________ PCl 3 phosphorus _______chloride CCl 4 carbon ________chloride N 2 O_____nitrogen _____oxide

9. Learning Check A.P 2 O 5 1) phosphorus oxide 2) phosphorus pentoxide 3) diphosphorus pentoxide B.Cl 2 O 7 1) dichlorine heptoxide 2) dichlorine oxide 3) chlorine heptoxide C. Cl 2 1) chlorine 2) dichlorine 3) dichloride