COVALENT BONDS
DO NOW
What is the ionic
formula for Calcium
and Fluorine?
WORD WALL
Big Question (3)
 Diagram two chlorine atoms
bonding.
 Is this an ionic bond?
 NO BECAUSE ONE ATOM IS
NOT STEALING AN ELECTRON
FROM THE OTHER
Today‘s Topic
 COVALENT BOND: a bond formed
when atoms shares electron pairs
 Diagram two oxygen atoms
bonding.
 What do we notice?
 We need to share two pairs of
electrons
Vocabulary
 SINGLE BOND: one pair shared
 DOUBLE BOND: two pairs shared
 TRIPLE BOND: three pairs shared
 DIATOMIC MOLECULE: two of the
same element bonded
How to Draw Covalent Bonds
 Hydrogen + Chlorine
 Bond: H—Cl
 Formula: HCl
Start with formula
 CO2
Single, Double, or triple?
DOUBLE
O=C=O
Start with the Formula
N2
Single, Double, or triple?
TRIPLE
Together
 NH3
Together
 Hydrogen and Oxygen
 Formula?
H2O
Try this one…
CH4
Try This One
 Sulfur and Fluorine


F—S—F
Independent Practice
 DIAGRAM AND WRITE FORMULA





Two hydrogens
Carbon and Fluorine
PBr3
CH4
Challenge: Nitrogen and Oxygen
 What is the different between ionic and
covalent?
 Give an example of a possible diatomic
molecule
Ionic or Covalent?
 K2S
 Ionic
 SO2
IONIC BOND:
Between a metal and
non-metal
 Covalent
 NaCl
 Ionic
 P2
 Covalent
COVALENT BOND:
Between two nonmetals
You Try!
Ionic or Covalent?
 SrCl2
 NO2
 Cl2
 BeBr2
Are these the same type of
bond?
 CH4
SHARE EVENLY
Non-polar
 CH3F
SHARE UNEVENLY
Polar
Types of Covalent Bonds
 Non-polar covalent: even sharing of
electrons
 CH4
 Polar covalent: uneven sharing of
electrons
 CH3F
Polar or Nonpolar?
 NH3
 THIS IS POLAR BECAUSE NITROGEN PULLS
ON HYDROGEN MORE THAN HYDROGEN
PULLS ON NITROGEN
Polar or Nonpolar?
 CO2
 This is nonpolar because they all pull equally on Carbon
Polar or Nonpolar?
 Water is polar because
Oxygen pulls hydrogen
more than hydrogen pulls
oxygen
Polar or Nonpolar?
 NaCl