Slide 1 of 15 chemistry

Slide 2 of 15 © Copyright Pearson Prentice Hall Naming and Writing Formulas for Molecular Compounds > Binary Molecular Compounds Binary molecular compounds are made of 2 nonmetals bound together. Since they are binary, they must end in – ide. Binary molecular compounds are named using prefixes

Slide 3 of 15 © Copyright Pearson Prentice Hall Naming and Writing Formulas for 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. 9.3 Naming Binary Molecular Compounds

Slide 4 of 15 © Copyright Pearson Prentice Hall Naming and Writing Formulas for Molecular Compounds > Carbon and oxygen combine to form carbon monoxide (CO) and carbon dioxide (CO 2 ), but these two invisible gases are very different. 9.3 Naming Binary Molecular Compounds

Slide 5 of 15 © Copyright Pearson Prentice Hall Naming and Writing Formulas for 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. 9.3 Naming Binary Molecular Compounds

Slide 6 of 15 © Copyright Pearson Prentice Hall Naming and Writing Formulas for 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. 9.3 Naming Binary Molecular Compounds

Slide 7 of 15 © Copyright Pearson Prentice Hall Naming and Writing Formulas for 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. If there is a double vowel, eliminate one. (i.e. it is carbon monoxide not carbon monooxide) 9.3 Naming Binary Molecular Compounds

Slide 8 of 15 © Copyright Pearson Prentice Hall Naming and Writing Formulas for 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. 9.3 Writing Formulas for Binary Molecular Compounds

© Copyright Pearson Prentice Hall Section Quiz -or- Slide 9 of 15 Continue to: Launch: Assess students’ understanding of the concepts in Section Section Quiz.

© Copyright Pearson Prentice Hall Slide 10 of 15 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 9.3 Section Quiz.

© Copyright Pearson Prentice Hall Slide 11 of 15 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 9.3 Section Quiz.

© Copyright Pearson Prentice Hall Slide 12 of 15 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 Section Quiz.

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