• Save

Loading…

Flash Player 9 (or above) is needed to view presentations.
We have detected that you do not have it on your computer. To install it, go here.

Like this presentation? Why not share!

5.2

on

  • 518 views

 

Statistics

Views

Total Views
518
Views on SlideShare
518
Embed Views
0

Actions

Likes
1
Downloads
0
Comments
0

0 Embeds 0

No embeds

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    5.2 5.2 Presentation Transcript

    • IONIC COMPOUND FORMATION 5.2
    • IONS
      • Octet rule:
        • all elements want 8 valence e-.
      • Cations = positive
      • Anions = negative, “ide”
    • Opposites Attract
      • Because cations are + and anions are – they attract each other.
      • This attraction forms Ionic Bonds.
    • Ionic Bonds
      • Ionic bonds are very strong.
      • Ionic Bonds are electrically neutral.
        • The charges cancel each other out.
        • You have to have the same number of + & -
      • Ionic bonds form salts.
        • Examples:
          • NaCl KCl CaI 2 MgF 2
    • Monatomic or Polyatmoic?
      • MONATOMIC:
      • 1 atom per ion
      • Na +1
      • Cl -1
      • O -2
      • Al +3
      • POLYATOMIC:
      • More than one atom per ion
      • NH 4 +1
      • SO 4 -2
      • OH -1
    • Polyatomic Ions NH 4 +1 All of the atoms in the ion act like ONE atom. The nitrogen and four hydrogens are like one atom with a +1 charge. You cannot separate the atoms!
    • Writing Formulas
      • To write a formula, you combine the fewest positive ions and negative ions to make the total charge of
      zero
    • EXAMPLES
    • COMBINE sodium and chlorine Na +1 Cl -1 To combine, we must make the charges = zero NaCl To name: use the names of the ions Sodium chloride
    • COMBINE calcium and bromine Ca +2 Br -1 We will need 2 bromine ions to match the +2 of calcium Ca Calcium bromide Br 2
    • COMBINE magnesium and nitrogen Mg +2 N -3 Can use least common denominator. 6 Mg 3 N 2 magnesium nitride
    • COMBINE magnesium and nitrogen Mg +2 N -3 Mg 3 N 2 magnesium nitride Flip flop the charges and turn them into subscripts.
    • Ion formation shortcuts
      • If charges are the same number drop charges and put symbols together.
        • The charges cancel out and become ZERO.
      • If charges are different numbers criss- cross the charge numbers and make a subscript on other ion.
    • Polyatomics??? K +1 SO 4 -2 Remember, in a Polyatomic ion all the atoms act as one, even the subscripts. If they are already there, they stay there! K 2 SO 4 potassium sulfate COMBINE potassium and sulfate
    • COMBINE aluminum and sulfate Al +3 SO 4 -2 Al 2 SO 4 3 ( ) aluminum sulfate How do we separate the subscripts so they look separate?
    • Practice problems 1. Ammonium and chlorine 2. Aluminum and selenate 3. Lead II and bicarbonate 4. Mercury I and phosphate
    • answers 1. NH 4 Cl Ammonium chloride 2. Al 2 (SeO 4 ) 3 Aluminum selenate 3. Pb(HCO 3 ) 2 Lead II bicarbonate 4. (Hg 2 ) 3 (PO 4 ) 2 Mercury I phosphate