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Chemical Formulas and Equations

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Presentation on theme: "Chemical Formulas and Equations"— Presentation transcript:

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. C6H12O6 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 CO2 N2O

6 Here are the first ten prefixes:
Mono- 1 Hexa- 6 Di- 2 Hepta- 7 Tri- 3 Octa- 8 Tetra- 4 Nona- 9 Penta- 5 Deca- 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= CO2 Prefixes always used on second atom C0 = carbon monoxide What is the formula for dinitrogen trioxide? ––> N2O3

8 More Practice 1. Dihydrogen monoxide 2. Silicon dioxide
3. Carbon monoxide 4. Hydrogen bromide 1. H2O 2. SiO2 3. CO 4. HBr

9 LET’S TRY IT! SiF4 Silicon tetrafluoride SF6 Sulfur hexafluoride N2O5
Dinitrogen pentaoxide

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