1 / 22

Formula Writing & Naming Compounds

Formula Writing & Naming Compounds. Formula. The representation of a substance using symbols (letters) and subscripts (numbers) H 2 O. Tells you which elements and how many atoms a compound is composed of. Writing Formulas for Binary Molecules - Covalent compounds. Binary

london
Download Presentation

Formula Writing & Naming Compounds

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. Formula Writing & Naming Compounds

  2. Formula • The representation of a substance using symbols (letters) and subscripts (numbers) H2O Tells you which elements and how many atoms a compound is composed of

  3. Writing Formulas for BinaryMolecules - Covalent compounds • Binary • made of 2 different elements • Molecules / Covalent • Both elements are non-metals • To the right of the “staircase” AND Hydrogen

  4. Ex. Phosphorus pentoxide • Write the symbols for the elements in order • ide refers to an element except peroxide & hydroxide • Subscripts are made from prefixes and follow the symbol • Mono = one Di = two Tri = three • Tetra = four Penta = 5 Hexa = 6

  5. Mono never STARTS a name! Practice • Carbon dioxide • Dihydrogen monoxide • Sulfur hexafluoride • Phosphorous pentachloride

  6. Formula Writing for Ionic Compounds • All ionic formulas are made of 2 parts A / B • A is positive B is negative A can be: Metal or Polyatomic ion B can be: Non-Metal or Polyatomic ion

  7. Ionic Names with Roman Numerals Copper II Chloride Copper II Chlorate • Write the symbols (polyatomic ion) • The positive oxidation state for the metal is given to you as a Roman Numeral • Look up the negative oxidation state • use the first in the list

  8. “Crisscross” charges to form subscripts • Write formula & reduce if you can • “1” doesn’t need to be written CuCl2 Cu(ClO3)2

  9. Practice • Lead II oxide • Lead IV oxide

  10. Ionic Names without Roman Numerals Potassium NitridePotassium Nitrate • Write down the symbols • If polyatomic ion look it up and write it in parenthesis. Don’t change it! • Assign oxidation states / charges Part A will be positive LOOK IT UP! Part B will be negative use the first in the list

  11. “Crisscross” 4. Write formula - REDUCE! • “1” doesn’t need to be written K3N KNO3

  12. Practice • Calcium Phosphate • Magnesium Hydroxide

  13. Formula Writing for 2 polyatomic ions Ammonium Phosphate • Write separate formulas in parenthesis • NEVERchange what’s inside!!!!!!!!!! • Assign charges • “Crisscross” • Cancel

  14. Practice • Ammonium Nitrate • Ammonium Hydroxide

  15. Naming……..

  16. Count the number of atoms as a prefix mono = one di = two tri = three tetra = four . . . 2. Write the prefix before the names of the elements Mono never STARTS a name Naming Binary Molecules. . . both elements are non-metals

  17. Write the name of the second element • end the name with -ide • hydrogen hydride • oxygen oxide • nitrogen nitride • sulfur sulfide • fluorine fluoride • chlorine chloride • bromine bromide Practice • CO2 • N2O • SCl5 • H2O • CCl4

  18. Naming when the compound starts with a metal MgCl2 FeCl2 • Name the first element • Check if this element has more than one positive oxidation state • no just name the second part • yesassign the negative oxidation state first then determine the positive • write it as a Roman Numeral

  19. CuSO4 Ba(OH)2 Al2S3 CuCl CuCO3 Remember: You only need a roman numeral if there is more than one oxidation state. Practice

  20. Naming polyatomic ion - element compounds NH4Cl • No prefixes • No roman numerals just name it! • Practice NH4F (NH4)2S

  21. Just name them! Practice (NH4)2SO4 (NH4)2CrO4 (NH4)3PO4 Naming compounds with 2 polyatomic ions

  22. The End

More Related