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22.3 Notes Continued

22.3 Notes Continued. Part C. Objectives. Write formulas and names for covalent compounds. Covalent compounds. Made of just nonmetals Share electrons Smallest piece is a molecule Can’t be held together because of opposite charges Can’t use charges to figure out how many of each atom.

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22.3 Notes Continued

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  1. 22.3 Notes Continued Part C

  2. Objectives • Write formulas and names for covalent compounds

  3. Covalent compounds • Made of just nonmetals • Share electrons • Smallest piece is a molecule • Can’t be held together because of opposite charges • Can’t use charges to figure out how many of each atom

  4. Covalent/Molecular compounds • Ionic compounds use charges to determine how many of each element. • Molecular compounds name tells you the number of atoms. • Uses prefixes to tell you the number

  5. Naming Covalent Compounds • Prefix element name Prefix element name-ide • The last vowel of the prefix is dropped when the second element begins with a vowel as in pentoxide • No double vowels when writing names (oa oo) • Often the prefix mono- is omitted from the first element when naming • Many times it is also omitted from 2nd element, though it is used for emphasis in some cases

  6. Examples • Carbon dioxide – CO2 • Dihydrogen monoxide – H2O • Dinitrogren pentasulfide – N2S5 • Tricarbon tetrafluoride – C3F4

  7. Name These • N2O • NO2 • Cl4O7 • NBr3 • BaCl5

  8. Writing formulas for Covalent Compounds • Simply write the chemical symbol • Subscript is derived from the prefix • Mono = 1, di = 2, tri = 3, ect

  9. Write formulas for these • diphosphorus pentoxide • tetraiodide nonoxide • sulfur hexaflouride • Carbon tetrahydride • phosphorus trifluoride

  10. Hydrates • An ionic compound that has water chemically attached to its ions and written into its chemical formula

  11. Hydrates pg. 708 • These same prefixes are used when naming the hydrates previously discussed. • The main ionic compound is named the regular way, but the number of water molecules in the hydrate is indicated by the Greek prefix. Chemical formula • # H2O

  12. Hydrates • BeBr * 3 H2O • Calcium nitride hexahydrate

  13. In-Class Assignment/Homework • Finish naming Molecular Compounds WKT • Naming practice on the board

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