1 / 18

CHEMICAL FORMULA

CHEMICAL FORMULA. Shows the elements and number of atoms per element present in a given compound Ex. Na Cl contains 1 Na atom and 1 Cl atom A number written as a subscript indicates the number of atoms in the element it is immediately written after.

caesar
Download Presentation

CHEMICAL FORMULA

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CHEMICAL FORMULA • Shows the elements and number of atoms per element present in a given compound Ex. NaCl contains 1 Na atom and 1 Cl atom • A number written as a subscript indicates the number of atoms in the element it is immediately written after. Ex. H2O = 2 H atoms + 1O atom • If a parenthesis is used, it changes the amount of all atoms written inside it. Ex. Ca(OH)2 = 1 Ca atom + 2O atoms + 2H atoms

  2. COUNT THE NUMBER OF ATOMS PER ELEMENT PRESENT • MgCl2 • KMnO4 • NH4OH • Al(OH)3 • (NH4)2SO4 1 Mg 2 Cl 1 K 1 Mn 4 O 1 N 5 H 1 O 1 Al 3 O 3 H 2 N 8 H 1 S 4 O

  3. IMPORTANCE OF NAMING COMPOUNDS • There are more than 100 elements. • There are millions of compounds. • 50,000 compounds are being developed each year!

  4. BINARY IONIC COMPOUNDS Composed of two monoatomic ions, cation (positive metal ion) and anion(negative non-metal ion). a. metal has single charge b. metal has multiple charges

  5. NAMING IONIC COMPOUNDS • BINARY IONIC COMPOUNDS a. METAL HAS A SINGLE CHARGE -The name of the metal is written first followed by the name of the non-metal. The name of the non-metal is changed such that it ends in–ide. Ex. K2S – potassium sulfide Mg3P2 – magnesium phosphide

  6. b. METAL HAS MULTIPLE CHARGES – follows the same rule as metals with single charge except that the charge is identified with by a roman number enclosed in a parenthesis. Ex. FeO – iron (II) oxide Fe2O3 – iron (III) oxide

  7. METALS WITH MULTIPLE OXIDATION NUMBERS

  8. CoMe Go +1,+2,+3

  9. CoMIC +2,+3

  10. TiLe +2,+4

  11. BINARY MOLECULAR COVALENT COMPOUND - Compound composed of two different non-metallic elements.

  12. STEPS IN NAMING BINARY MOLECULAR COVALENT COMPOUND 1. The more electronegative non-metallic element is written or named last. This is usually the element present on the right side of the periodic table. O + S = SO or OS?

  13. 2. Greek prefixes are used to identify the number of atoms per element present. If the first element consists of only one atom, the numerical prefix mono- is usually omitted. GREEK NUMERICAL PREFIXES

  14. 3. For the second element, the stem name is retained and the suffix –ide is added to the it. O + S = SO? +6 -2 S O S O 3 2 6 Sulfur trioxide

  15. EXCEPTIONS TO THE RULE H2O - water NH3 - ammonia PH3 - phosphine CH4 - methane

More Related