molecular geometry and lewis dot structures - mckenziem1020.ppt

CHAPTER 7
Molecular Geometry and
Lewis Dot Structures
Bonding
Each water molecule contains one oxygen atom and two hydrogen atoms.
One central oxygen atom
One hydrogen atom on either side
Each water molecule contains one oxygen atom and two hydrogen atoms.
One central oxygen atom
One hydrogen atom on either side
Why can’t a water molecule be like this?
Why can’t a water molecule be like this?
The oxygen forms one bond
One hydrogen forms two bonds
One hydrogen forms one bond
The Lewis structures indicate that it is not possible
Lewis structures for individual atoms are like puzzle pieces.
Put them together to form molecules.
Use Lewis structures to predict:
1) the chemical formula
The chemical formula for water is H2O
(2 hydrogen atoms for every 1 oxygen atom)
Use Lewis structures to predict:
1) the chemical formula
2) the bonding pattern
Oxygen must be the central atom
Use Lewis structures to predict:
1) the chemical formula
2) the bonding pattern
3) the shape of the molecule
H2O is flat and bent
Use Lewis structures to predict:
1) the chemical formula
2) the bonding pattern
3) the shape of the molecule
H2O is flat and bent
To be discussed
later in this section
Consider the chemical formula C2H6O
Does this look right?