Drill Determine the formulas for the following: 1. Na and Cl 2. Zn 2+ and Cl

Objective The student will be able to:  Generate rules in order to practice naming and writing formulas for binary molecular compounds.

SAT/HSA Enrichment When gypsy moth caterpillars hatch, which of these populations benefits first? a. red oak b. deer tick c. blue jay d. carpenter ant

Ionic Compounds Review Working in groups and using the white boards we are going to complete the review worksheet.  Points gained will be used towards your quiz grade.

Quiz Naming Ionic Compounds  Name or write the formula for the ionic compounds.

Engagement: Numerical Prefixes:  Match the correct prefixes with the correct number.

Naming and Writing Formulas for Molecular Compounds What is the relationship between the name and the formula of a compound?

Naming and Writing Formulas for Molecular Compounds One milligram of gold is worth only about one cent, but one kilogram of gold is worth approximately $12,500. The correct prefix ( milli- or kilo- ) makes quite a difference! Prefixes are important in chemistry, too. The prefixes in the name of a binary molecular compound tell you its composition.

Carbon and oxygen combine to form carbon monoxide (CO) and carbon dioxide (CO 2 ), but these two invisible gases are very different. Naming Binary Molecular Compounds

 Sitting in a room with small amounts of CO 2 in the air would not present any problems. If the same amount of CO were in the room, you could die of asphyxiation. A naming system that distinguishes between these two compounds is needed. Naming Binary Molecular Compounds

A prefix in the name of a binary molecular compound tells how many atoms of an element are present in each molecule of the compound. Naming Binary Molecular Compounds

Some guidelines for naming binary molecular compounds:  Name the elements in the order listed in the formula.  Use prefixes to indicate the number of each kind of atom. Naming Binary Molecular Compounds

Omit the prefix mono- when the formula contains only one atom of the first element in the name.  The suffix of the name of the second element is - ide. Naming Binary Molecular Compounds

Use the prefixes in the name to tell you the subscript of each element in the formula.  Then write the correct symbols for the two elements with the appropriate subscripts. Writing Formulas for Binary Molecular Compounds

Silicon carbide is a hard material like diamond. The name silicon carbide has no prefixes, so the subscripts of silicon and carbon must be one. Thus, the formula for silicon carbide is SiC. Writing Formulas for Binary Molecular Compounds

Section Quiz 1.Which of the following compounds is named INCORRECTLY? a. CS 2, carbon disulfide b. BCl 3, boron trichloride c. IF 7, iodine heptafluoride d. PCl 5, phosphorus hexachloride

2.Which of the following molecular compounds is named INCORRECTLY? a. SbCl 3, antimony trichloride b. C 2 O 5, dicarbon pentoxide c. CF 4, carbon tetrafluoride d. H 3 As, hydrogen arsenide Section Quiz

3.The correct formula for tetraphosphorus trisulfide is a. P 3 S 4 b. S 3 P 4 c. P 4 S 3 d. S 4 P 3 Section Quiz

Naming Binary Molecular Compounds  Students divide into eight groups.  Each group is responsible for generating three rules for naming binary molecular compounds  Post your rules on chart paper and post on the board, under Rule 1, Rule 2, and Rule 3.

Class Discussions Students discuss the rules they generated and come up with a final rule that incorporates the student’s ideas. Using the generated rules the class will complete Part II of the Naming Binary Molecular Compounds worksheet.

Writing and Naming Molecular Compounds Students will work in pairs to complete worksheet. Class will review answers to the worksheet.

Summary 1. Did we accomplish the objective? Explain. 2. Explain a system that may be used when naming binary molecular compounds. 3. When is it appropriate to add a prefix to the first element of a binary molecular compound?

Summary 1. When is it not appropriate to add a prefix to the second element of a binary molecular compound? 2. What is the suffix that should be added to the end of the second element? The first element? 3. Name the following binary molecular compounds:  PBr3  P2O3

Homework 9.3 Naming and Writing Formulas for Molecular Compounds worksheet. Exit ticket  Naming and Writing Formulas for Molecular Compounds