Chemical Formulas Chapter 13, Section 2. Chemical Formulas… Letters are used to form words. Chemical symbols are put together to make chemical formulas.

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Presentation transcript:

Chemical Formulas Chapter 13, Section 2

Chemical Formulas… Letters are used to form words. Chemical symbols are put together to make chemical formulas. Words are used to make sentences. Chemical formulas describe chemical reactions.

What is a chemical formula? A chemical formula is a combination of chemical symbols and numbers to represent a substance. Subscript

Prefixes Used in Chemical Names: Mono- 1Hexa- 6 Di- 2Hepta- 7 Tri- 3Octa- 8 Tetra- 4Nona- 9 Penta- 5Deca- 10

Diatomic Elements Iodine, Bromine, Oxygen, Chlorine, Hydrogen, Fluorine, Nitrogen I BRoke Old CLyde’s Head For Nothing. I 2, Br 2, O 2, Cl 2, H 2, F 2, N 2

Writing Formulas: Example: Sulfur trioxide = SO 3 Calcium fluoride = CaF 2 Phosphorus pentachloride = PCl 5

Reverse the Formula… Example: N2O3N2O3 Dinitrogen trioxide Li 2 O Lithium oxide

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