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Naming:

Naming:. Chemical Names and Formulas. What ’ s in a name?. When two people use different names for the same thing, misunderstood words are apt to happen. The British and Americans often get confused. . Find the bonnet. Find the boot. .

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Naming:

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  1. Naming: Chemical Names and Formulas

  2. What’s in a name? • When two people use different names for the same thing, misunderstood words are apt to happen. The British and Americans often get confused.

  3. Find the bonnet. Find the boot.

  4. Which is the chemist and which is the pharmacist?

  5. Where's the dummy?

  6. Which is plaster and which is a band-aid?

  7. Chemical Names and Formulas • International Union of Pure and Applied Chemistry (IUPAC) • Use knowledge of bonding to write the names and formulas of compounds containing 2 different atoms or ions • Compounds with 2 different elements are called binary compounds • Usually end in “ide”

  8. Formulas for Binary Ionic Compounds • H2O = the subscript 2 tells us we have 2 hydrogen atoms and 1 oxygen atom • Overall the net charge must be 0 • Total cation charge must be equal to the total anion charge • Ex. H2O 2H = 2(+1)=+2 1O = 1(-2)= -2 • Use the “cross over” method to balance charges

  9. Cross Over Method • 1.Write the ions beside each other • 2. Cross over the amount of the charge on the cation so that it becomes the subscript of the anion. • 3. Cross over the amount of the charge on the anion so that it becomes the subscript of the cation

  10. Remember to reduce!!!!!!!

  11. Chemical Names • 1. Write down the names of both ions beside one another • 2. Remember that binary ionic compounds always end in “ide” so, change the ending of the 2nd ion’s name to “ide” _______ide • Ex. Al2O3 • Aluminum oxygen • Aluminum oxide

  12. CaO • Calcium Oxygen • Calcium oxide • K2S • Potassium Sulfur • Potassium sulfide • NaCl • Sodium Chlorine • Sodium chloride

  13. Transition Metal Charge • Nearly all transition metals (group 3-12) are able to form more than one cation • Ex. Iron = Fe (III) Fe3+ Fe(II) Fe2+ • Given the formula of an ionic compound, can use the reverse cross over method to determine the charge of the cation • Ex. FeCl3 FeO • Fe3+ Cl-1 Fe2+ O2-

  14. Transition Metal Naming • 2 ways to name the cation of a transition metal • Classical system (based on Latin names) • Stock system (based on roman numerals) Classical System: • Latin names for iron- ferrum; copper- cuprum; lead- plumbum • The “um” from the latin name is dropped and “ic” is added for higher charges and “ous” is added for lower charges

  15. Iron • Latin name- ferrum • Fe2+ ferrous • Fe3+ ferric • Copper • Latin name- cuprum • Cu+ • Cuprous • Cu2+ • Cupric

  16. Stock system: • Uses roman numerals based on the charge of the cation • 1 – I 2 – II 3 – III • 4 – IV 5 – V 6 – VI • Only used for metals that have more then one type of cation • Ex. Fe2+ and Fe3+ • Iron (II) and iron (III) • Ex. FeS • Fe2+ S2- Iron (II) Sulfur • Iron (II) sulfide

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