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Formulas for ionic compounds

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Formulas for ionic compounds - PowerPoint PPT Presentation


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Formulas for ionic compounds. Chemical names. The International Union of Pure and Applied Chemistry (IUPAC) names compounds Chemical names always have two parts: one for each type of ion in it. Salt (Sodium Chloride) is made from a positive sodium ion and a negative chlorine ion.

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chemical names
Chemical names
  • The International Union of Pure and Applied Chemistry (IUPAC) names compounds
  • Chemical names always have two parts: one for each type of ion in it.
  • Salt (Sodium Chloride) is made from a positive sodium ion and a negative chlorine ion.
  • The positive metal gets listed first in the name
  • The negative non metal ion has its ending changed to “ide” (chlorine become chloride)
how to write ionic compound names
How to write Ionic compound names
  • Name the metal ion
  • Name the non-metal ion (end in “ide”)
  • Write the name of the compound

Ex: MgBr2 is made from the metal magnesium and the non-metal bromine

It gets named magnesium bromide

chemical formula
Chemical formula
  • The chemical formula of an ionic compound contains symbols to identify each ion
  • The chemical formula also shows the relative numbers of ions in the compound

Ex: sodium chloride NaCl (one Na and one Cl)

Ex: calcium flouride CaF2 (one Ca, two F)

Ex: aluminium oxide Al2O3 (two Al, three O)

rules for writing formulas
Rules for writing formulas
  • Positive and negative ions must balance out (be equal in number)
  • The final formula must equal the smallest whole number ratio (remember math class?)

Steps:

  • Identify the charge of each ion
  • Determine total charges needed to balance
  • Note the ratio of positive ot negative ions
  • Use “subscripts” to write the formula (do not write the # 1)
example zinc nitride
Example: zinc nitride
  • Zinc: Zn2+ and Nitride N3-
  • Zn 2+ : +2, +2, +2 = +6

N3- : -3, -3 = -6

  • 3 Zn2+ ions needed for every 2 N3- ions (3:2)
  • Zn3N2
now you try with aluminium chloride
Now you try with: aluminium chloride
  • Aluminium is AL3+ chloride is Cl-
  • Al3+ : +3 = +3

Cl - : -1, -1, -1 = - 3

  • 1 Al3+ ions needed for every 3 Cl- ions (1 :3)
  • AlCl3
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