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Writing Formulas

Writing Formulas. Chapter 6 ( Chapter 9 ). Rules for Writing Chemical Formulas. Name does NOT begin with a metal. Name begins with a metal. (Ammonium acts like a metal). Ends with –ATE/-ITE. ‘ ACID’ in the name. No ACID in Name. Ends with -IDE. ) Write the metal symbol/charge

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Writing Formulas

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  1. Writing Formulas Chapter 6 (Chapter 9)

  2. Rules for Writing Chemical Formulas Name does NOT begin with a metal Name begins with a metal (Ammonium acts like a metal) Ends with –ATE/-ITE ‘ACID’ in the name No ACID in Name Ends with -IDE • ) Write the metal symbol/charge • ) Write the non metal symbol/charge • 3) Add subscripts if necessary to make it neutral (criss-cross) • ) Write the metal symbol/charge • ) Write the polyatomic ion/charge • 3) Add subscripts/parenthesis if necessary to make it neutral (criss-cross) • ) Write each element symbol [NO CHARGES USED HERE] [NO Polyatomic IONS HERE] • 2) The Prefix IS the subscript • (mono, di, tri, tetra, penta, hexa, hepta, octa, nona, deca) ‘HYDRO’ in front No ‘HYDRO’ in front Name ends with -IC Name ends with - OUS • ) Write H+1 • ) Write non metal symbol/charge • ) Add subscripts if necessary to make it neutral (criss-cross) Classic Names: add –OUS for lower charge/ -IC for higher charge to these roots 1) Write H+1 2)Write Polyatomic ion that ends with -ATE 3) Add subscripts if needed to make it neutral 1) Write H+1 2)Write Polyatomic ion that ends with -ITE 3) Add subscripts if needed to make it neutral

  3. All molecules have a neutral charge Subscripts are used when individual charges are not the same Parenthesis are used ONLY WITH POLYATOMIC IONS that need a subscript to make it neutral Two non metals have prefixes to indicate their subscripts The charges of representative elements are known to be: Rules for Writing Chemical Formulas

  4. Charges for metals and non metals

  5. Potassium sulfate K2SO4

  6. Barium oxalate BaC2O4

  7. Chlorous acid HClO2

  8. Ammonium sulfite (NH4)2SO3

  9. Magnesium carbonate MgCO3

  10. Carbon tetrabromide CBr4

  11. Diphosphorous pentoxide P2O5

  12. Nitric Acid HNO3

  13. Sodium hydrogen sulfite NaHSO3

  14. Oxalic acid H2C2O4

  15. Aluminum acetate Al(C2H3O2) 3

  16. Magnesium hydroxide Mg(OH)2

  17. Phosphorous Acid H3PO3

  18. Hydrofluoric Acid HF

  19. Zinc hypochlorite Zn(ClO)2

  20. Lithium hydride LiH

  21. Chloric acid HClO3

  22. Rubidium sulfide Rb2S

  23. Strontium chromate SrCrO4

  24. Potassium permanganate KMnO4

  25. Sodium cyanide NaCN

  26. Calcium hydrogen sulfite Ca(HSO3)2

  27. Barium nitrate Ba(NO3)2

  28. Phosphorous acid H3PO3

  29. Silver chromate Ag2CrO4

  30. Zinc carbonate ZnCO3

  31. stop

  32. SO3 Sulfur trioxide

  33. BeSe Beryllium selenide

  34. AlN Aluminum nitride

  35. NH4C2H3O2 Ammonium acetate

  36. PCl3 Phosphorous trichloride

  37. K2HPO3 Potassium hydrogen phosphite

  38. H2SO4 Sulfuric acid

  39. H2S Hydrosulfuric acid

  40. (NH4)2C2O4 Ammonium oxalate

  41. HNO2 Nitrous acid

  42. Al2(SO4)3 Aluminum sulfate

  43. LiClO2 Lithium chlorite

  44. Ag2Cr2O7 Silver dichromate

  45. Hl Hydroiodic acid

  46. NaClO Sodium hypochlorite

  47. NI3 Nitrogen triodide

  48. H2CrO4 Chromic acid

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