Important Information: 7.1 Practice Problems Chapter 7 Vocabulary 1-10 Chapter 7 Notes: A-E Activity: Naming Ionic Compounds due Wed 7.1 Reading Guide due Friday Activity: Naming Molecular (Covalent) Compounds due Fri 7.1 Study Guide due Friday 7.2 Reading Guide due Monday

Section 7.1 Naming and Writing Formulas for Molecular Compounds The prefix in the name of a binary molecular compound tells how many atoms of each element are present in each molecule of the compound. p. 215

Section 7.1 Naming and Writing Formulas for Molecular Compounds Molecular compounds are… made of just nonmetals smallest piece is a molecule can’t be held together by opposite charge attraction can’t use charges to figure out how many of each atom (there are no charges present)

Molecular compounds are easier! Ionic compounds use charges to determine how many of each. Molecular compounds: the name tells you the number of atoms. prefixes tell you exact number of each element present!

D. Covalent Prefixes (Figure 1.4, p.216) 1 = mono- used only with oxygen when 2nd element 2 = di- 3 = tri- 4 = tetra- 5 = penta- 6 = hexa- 7 = hepta- 8 = octa- 9 = nona- 10 = deca-

E. Naming Molecular Compounds 1. confirm it is binary molecular compound (two nonmetals) 2. use subscripts to determine prefix 3. first element: prefix+name 4. second element: prefix+name with –ide suffix Normally, we do not have double vowels when writing names (oa oo) Prefix +name Prefix +name +-ide Ex: Cl2O8 di chlorine octa oct oxide

Practice by naming these: N2O NO2 Cl2O7 CBr4 CO2 BaCl2 = dinitrogen monoxide (also called nitrous oxide or laughing gas) = nitrogen dioxide = dichlorine heptoxide = carbon tetrabromide = carbon dioxide (This one will not use prefixes, since it is an ionic compound!)

Write formulas for these: diphosphorus pentoxide tetraiodine nonoxide sulfur hexafluoride nitrogen trioxide carbon tetrahydride phosphorus trifluoride dihydrogen monoxide

7.1 Practice Problems p. 211: 1-2 p. 213: 1-2 p. 215: 1-2 p. 217: 1-2 Finish a set and turn to Appendix E page (R121) to check and correct your answers.. Self-correct.