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Chemical Formulas and Equations Chapter 9 – 2 Part 1.

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1 Chemical Formulas and Equations Chapter 9 – 2 Part 1

2 Chemical Formulas A chemical formula is a shorthand way to use chemical symbols and numbers to represent a substance. A subscript is a number written below and to the right. –It tells how many atoms are in this molecule. –If there is no subscript, then there is just one atom. C 6 H 12 O 6 Glucose

3 Some Basic Rules When you have two elements, you have two words in the name The first word is the first element. The second word is the second element.

4 Continued The second word also ends in “IDE”. Like oxygen becomes oxide.

5 Writing Formulas for COVALENT COMPOUNDS Covalent compounds are often composed of nonmetals. The names of many covalent compounds use prefixes. Example: Carbon Dioxide & Dinitrogen monoxide CO 2 N2ON2O

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

7 Writing Formulas Covalent Compounds Use the name of compound to write its formula Ex: Carbon Dioxide No prefix on first atom indicates 1 atom The prefix di indicates 2 oxygen atoms= CO 2 Prefixes always used on second atom C0 = carbon monoxide What is the formula for dinitrogen trioxide? ––> N 2 O 3

8 More Practice 1. Dihydrogen monoxide 2. Silicon dioxide 3. Carbon monoxide 4. Hydrogen bromide 1. H 2 O 2. SiO 2 3. CO 4. HBr

9 LET’S TRY IT! SiF 4 Silicon tetrafluoride SF 6 Sulfur hexafluoride N 2 O 5 Dinitrogen pentaoxide

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