Covalent (Molecular) Bonds Grade 7 ChemistryMr. JohnstonSaigon South International School

Guiding Questions

1. How are atoms held together in a covalent (molecular) bond?

2. What are the properties of molecular (covalent) bond?

3. How do bonded atoms become partially charged?

Key Vocabulary

Covalent BondsMoleculeDouble BondTriple BondMolecular CompoundNon-Polar BondPolar Bond

Comparing Ionic and Covalent Bonds

Additional Readings on Covalent Bonds

COVALENT BONDbond

formed by the sharing of electrons between 2 non-metals

Part 1: How are atoms held together in a covalent bond?

Covalent bonds- Two atoms share one or more pairs of outer-shell electrons.

Oxygen Atom Oxygen Atom

Oxygen Molecule (O

2)

What are the properties of of Molecular compounds?

Unlike ionic compounds, molecular (covalent) compounds do not usually conduct electricity, when melted or dissolved in water. Also, compared to ionic compounds, molecular compounds generally have lower melting points and boiling points”

when electrons are shared equally

NONPOLAR COVALENT BONDS

H2 or Cl2

when electrons are shared but shared

unequally

POLAR COVALENT BONDS

H2O

Way to remember a polar bond...

The stronger, more stable atom pulls harder!

Exit interview on infuse learning!