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Ionic Compounds

Ionic Compounds. Writing Formulas. Ionic Compounds. Metal + Nonmetal Can have a polyatomic ion Cation is first Anion is second TOTAL charge has to be zero!. Transition Metals. Can form different ions Ion charge is indicated with romal numerals after the element’s name

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Ionic Compounds

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  1. Ionic Compounds Writing Formulas

  2. Ionic Compounds • Metal + Nonmetal • Can have a polyatomic ion • Cation is first • Anion is second • TOTAL charge has to be zero!

  3. Transition Metals • Can form different ions • Ion charge is indicated with romal numerals after the element’s name • Example: copper(I) has a +1 charge

  4. Steps for Writing Formulas • Several examples will follow this slide! • Write out the two parts that will be in the compound. • Look up the charge and write it as a superscript for each part. • Cross the numbers (no signs). • Reduce the formula to the lowest numbers.

  5. Example 1 • What is the formula for the ionic compound made from sodium and fluorine?

  6. What is the formula for the ionic compound made from sodium and fluorine? 1. Write out the two parts that will be in the compound. Na F

  7. 2. Look up the charge and write it as a superscript for each part. - Na + F What is the formula for the ionic compound made from sodium and fluorine?

  8. 3. Cross the numbers (no signs). - Na + F 1 1 What is the formula for the ionic compound made from sodium and fluorine?

  9. 4. Reduce the numbers. Na F 1 1 What is the formula for the ionic compound made from sodium and fluorine?

  10. 5. Rewrite as a finished formula. Na F What is the formula for the ionic compound made from sodium and fluorine?

  11. Wrap-Up 1 • What is the formula for a compound made from lithium and bromine? • LiBr

  12. Example 2 • What is the formula for the ionic compound made from aluminum and iodine?

  13. What is the formula for the ionic compound made from aluminum and iodine? 1. Write out the two parts that will be in the compound. Al I

  14. 2. Look up the charge and write it as a superscript for each part. - Al 3+ I What is the formula for the ionic compound made from aluminum and iodine?

  15. 3. Cross the numbers (no signs). - Al 3+ I 1 3 What is the formula for the ionic compound made from aluminum and iodine?

  16. 4. Reduce the numbers. Al I 1 3 What is the formula for the ionic compound made from aluminum and iodine?

  17. 5. Rewrite as a finished formula. AlI 3 What is the formula for the ionic compound made from aluminum and iodine?

  18. Wrap-Up 2 • What is the formula for a compound made from beryllium and chlorine? • BeCl2

  19. Example 3 • What is the formula for the ionic compound made from potassium and nitrogen?

  20. What is the formula for the ionic compound made from potassium and nitrogen? 1. Write out the two parts that will be in the compound. K N

  21. 2. Look up the charge and write it as a superscript for each part. + 3- K N What is the formula for the ionic compound made from potassium and nitrogen?

  22. 3. Cross the numbers (no signs). 3- K + N 3 1 What is the formula for the ionic compound made from potassium and nitrogen?

  23. 4. Reduce the numbers. K N 3 1 What is the formula for the ionic compound made from potassium and nitrogen?

  24. 5. Rewrite as a finished formula. K3N What is the formula for the ionic compound made from potassium and nitrogen?

  25. Wrap-Up 3 • What is the formula for a compound made from cesium and sulfur? • Cs2S

  26. Example 4 • What is the formula for the ionic compound made from magnesium and selenium?

  27. What is the formula for the ionic compound made from magnesium and selenium? 1. Write out the two parts that will be in the compound. Mg Se

  28. 2. Look up the charge and write it as a superscript for each part. 2- 2+ Mg Se What is the formula for the ionic compound made from magnesium and selenium?

  29. 3. Cross the numbers (no signs). 2- Mg 2+ Se 2 2 What is the formula for the ionic compound made from magnesium and selenium?

  30. 4. Reduce the numbers. Mg Se 2 2 What is the formula for the ionic compound made from magnesium and selenium?

  31. 5. Rewrite as a finished formula. MgSe What is the formula for the ionic compound made from magnesium and selenium?

  32. Wrap-Up 4 • What is the formula for a compound made from indium and arsenic? • InAs

  33. Example 5 • What is the formula for the ionic compound made from iron(III) and oxygen?

  34. What is the formula for the ionic compound made from iron(III) and oxygen? 1. Write out the two parts that will be in the compound. Fe O

  35. 2. Look up the charge and write it as a superscript for each part. 2- O Fe 3+ What is the formula for the ionic compound made from iron(III) and oxygen?

  36. 3. Cross the numbers (no signs). 2- Fe 3+ O 2 3 What is the formula for the ionic compound made from iron(III) and oxygen?

  37. 4. Reduce the numbers. Fe O 2 3 What is the formula for the ionic compound made from iron(III) and oxygen?

  38. 5. Rewrite as a finished formula. Fe2O3

  39. Wrap-Up 5 • What is the formula for a compound made from lead(IV) and sulfur? • PbS2

  40. Example 6 • What is the formula for the ionic compound made from sodium and phosphate?

  41. What is the formula for the ionic compound made from sodium and phosphate? 1. Write out the two parts that will be in the compound. Na PO4

  42. 2. Look up the charge and write it as a superscript for each part. 3- + Na PO4 What is the formula for the ionic compound made from sodium and phosphate?

  43. 3. Cross the numbers (no signs). 3- + Na PO4 3 1 What is the formula for the ionic compound made from sodium and phosphate?

  44. 4. Reduce the numbers. PO4 Na 3 1 What is the formula for the ionic compound made from sodium and phosphate?

  45. 5. Rewrite as a finished formula. Na3PO4

  46. Wrap-Up 6 • What is the formula for a compound made from cesium and sulfite? • Cs2SO3

  47. Example 7 • What is the formula for the ionic compound made from chromium(III) and nitrate?

  48. What is the formula for the ionic compound made from chromium(III) and nitrate? 1. Write out the two parts that will be in the compound. Cr NO3

  49. 2. Look up the charge and write it as a superscript for each part. 3+ - Cr NO3 What is the formula for the ionic compound made from chromium(III) and nitrate?

  50. 3. Cross the numbers (no signs). 3+ - Cr NO3 1 3 What is the formula for the ionic compound made from chromium(III) and nitrate?

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