Presentation on theme: "Covalent Bonding. Lesson1 :Covalent Bonding Covalent bonds: atoms held together by sharing electrons. Molecules: neutral group of atoms joined together."— Presentation transcript:
Lesson1 :Covalent Bonding Covalent bonds: atoms held together by sharing electrons. Molecules: neutral group of atoms joined together by covalent bonds. Diatomic molecule: molecule consisting of 2 atoms. Remember them: F 2, Cl 2, I 2, Br 2, H 2, N 2, O 2 Molecules tend to have lower melting and boiling points than ionic compounds. YouTube - Making Molecules with Atoms
Molecular Formula Shows how many atoms of each element a molecule contains. Naming binary molecular compounds Composed of two nonmetals; often combine in more than one way. Ex. CO and CO 2 Prefixes are used to name binary molecular compounds. PrefixMono-Di-Tri-Tetra-Penta-Hexa-Hepta-Octa-Nona-Deca- Number
Binary Compounds Containing Two Nonmetals To name these compounds: 1)give the name of the less electronegative element first with the Greek prefix indicating the number of atoms of that element present 2) After give the name of the more electronegative non- metal with the Greek prefix indicating the number of atoms of that element present and with its ending replaced by the suffix –ide. 3)Do not use the prefix mono- if required for the first element.
Binary Molecular Compounds N 2 Odinitrogen monoxide N 2 O 3 dinitrogen trioxide N 2 O 5 dinitrogen pentoxide ICliodine monochloride ICl 3 iodine trichloride SO 2 sulfur dioxide SO 3 sulfur trioxide YouTube - Naming molecular compounds
Binary Molecular Compounds Containing Two Nonmetals 1.________________ diarsenic trisulfide 2.________________sulfur dioxide 3. P 2 O 5 ____________________ 4.________________ carbon dioxide 5. N 2 O 5 ____________________ 6. H 2 O____________________ As 2 S 3 SO 2 diphosphorus pentoxide CO 2 dinitrogen pentoxide dihydrogen monoxide
Naming Binary Compounds Binary Compound? Metal Present? Does the metal form more than one cation? Molecule Use Greek Prefixes Ionic compound (cation has one charge only) Use the element name for the cation. Ionic compound (cation has more than one charge) Determine the Charge of the cation; use a Roman numeral after the cation name. Yes No Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 98