Ionic Compounds

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Ionic Compounds

• An ionic bond holds positive ion(s) and negative
  ion(s) together to form compounds

Click Here for an Ionic Bond Animation
http//www.agen.ufl.edu/chyn/age2062/lect/lect_0
2/2_11a.gif
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Ionic Compounds

• Most are compounds that contain a metal and a
  non-metal.
• Ex NaCl

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Ionic Compounds

• Most form crystal structures.
• Can be very brittle and will break or shatter on
  contact.

http//liftoff.msfc.nasa.gov/academy/materials/to
paz.gif
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Ionic Compounds

• Most have high melting points. (Very Strong
  Bonds!)
• Most will dissolve easily in water
• Will conduct electricity when liquid or dissolved
  in H2O

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Ionic Compound Formulas

• Chemical Formulas show how many atoms of a
  particular element are present in a compound
• Example Al2O3
• 2 Aluminum atoms 3 Oxygen atoms

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Ionic Compound Formulas

• Ionic formulas are determined by the positive and
  negative charges of the atoms.

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http//wps.prenhall.com/wps/media/objects/602/616
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Ionic Compound Formulas

• Example Magnesium Chloride
• Mg2 and Cl-1
• You need 2 Cl-1 to neutralize the Mg2
• MgCl2

http//www.southwest.com.au/jfuller/chemistry/ma
gnesiumchloride.gif
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Ionic Compound Formulas

• Use the Criss-Cross method to write formulas
• Ex Sodium Sulfide

Na1
S-2
Na
S
2
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Ionic Compound Formulas

• Ex Magnesium Oxide
• Mg2 and O-2
• Criss-Cross gets Mg2O2
• But only 1 atom of each is needed to neutralize
  so MgO is correct!

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Ionic Compound Names

• 1st - Write the name of the metallic element.
• 2nd Then write the name of the non-metallic
  element with the suffix ide.

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Ionic Compound Names

• Example MgBr2
• Magnesium Bromide
• Example Al2O3
• Aluminum Oxide

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Transition Metal Ions

• Transition metals do not have an ion pattern and
  can have more than one type of charge.

http//wps.prenhall.com/wps/media/objects/602/616
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Transition Metal Ions

• Example FeO
• What is the charge of Fe?
• We know O-2
• Fe must be 2 to neutralize the 2 of Oxygen...
• Iron (II) Oxide

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Transition Metal Ions

• Example Cu2O
• Copper (I) Oxide

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Polyatomic Ions

• Ions that are made of multiple atoms.
• Example OH- is the hydroxide ion.
• Pg. 232

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Polyatomic Ions

• When naming, use the exact name of the ion.
• Example NaNO3
• This is sodium nitrate.

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Polyatomic Ions

• Example Magnesium Hydroxide
• Mg2 and OH-
• Mg OH 2

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