Objectives
• I can compare the properties of ionic and
covalent compounds with a Venn diagram.
• I can practice drawing Lewis Dot Diagrams
of molecules by completing a worksheet.
• I can investigate the relationship between
electronegativity and chemical bonding by
sorting compounds by electronegativity
data.
Ionic vs. Covalent Bonds
• Bond Strength = the energy needed to
break the bonds between atoms in a
compound.
Ionic vs. Covalent Bonds
Ionic Bonds
Covalent Bonds
Atoms in ionic compounds are held
together by ionic bonds.
Atoms in covalent or molecular
compounds are held together by
covalent bonds.
Ionic bonds are stronger (more bond
strength)
Covalent bonds are weaker (less
bond strength)
Ionic vs. Covalent Bonds
Ionic Bonds
Covalent Bonds
Formed by Transfer of
electrons
Formed by Sharing of
electrons
Ionic vs. Covalent Bonds
Ionic Bonds
Covalent Bonds
Structure: Crystal Lattice Structure: Molecules
Water (H2O) molecules
Lithium Chloride (LiCl)
crystal lattice
Ionic vs. Covalent Bonds
Ionic Bonds
Covalent Bonds
Consist of Metal and
nonmetal
Consist of Nonmetal and
nonmetal
Ionic vs. Covalent Bonds
Ionic Bonds
Covalent Bonds
State of matter: Solid at
room temp.
State of matter: Solid,
Liquid or Gas at room
temp.
Ionic vs. Covalent Bonds
Ionic Bonds
Covalent Bonds
Conductivity? Conducts Conductivity: Does not
electricity when
conduct electricity when
dissolved.
dissolved.
Ionic vs. Covalent
• Think, Pair, Share: With a partner, fill in
the middle overlapping portion of the Venn
diagram. What do ionic and covalent
compounds have in common?
• Possible answers:
– types of compounds, formed by chemical
bonds, include more than one atom, involve
electrons, are formed and broken by chemical
reaction
Chemistry of Life
 All organisms (living things) are made of
macromolecules.
 Macromolecules are large covalent compounds.
 The atoms in proteins, carbohydrates, nucleic
acids, and lipids are all connected by covalent
bonds.
3 Types of Bonding
**IONIC
How are ELECTRONS are
Bonds
transferred
Formed? between ions (1
Type of
Bond
Formed
Who’s
Involved
?
*COVALENT METALLIC
Electrons are shared
between atoms.
steals, 1 gives)
Solid Crystals with Usually liquid or
repeating patterns solid
of (+) and (-) ions
METAL + NONMETAL
Special
When dissolves in
Properties H20, conducts
electricity
“Sea of Electrons”
Spread all over
between atoms of
the same element.
Solid metal
NON-METAL +
NON-METAL
METAL AND
METAL
Does not conduct
electricity
Very good conductors
of electricity on their
own!