Define polarity and molecular shape

Polarity- a seperation of electric charge leading to a molecule having an electric dipole. 
Molecular shape- Identify the central atom.
Count its valence electrons.
Add one electron for each bonding atom.
Add or subtract electrons for charge
Divide the total of these by 2 to find the total.number of electron pairs.
Use this number to predict the shape.

Polarity is an essential and common feature in organisms, particularly at the cell level. Example: polarity of cells in a developing embryo (during embryogenesis) polarity of cells in axis formation.

Molecular shape is the arrangement of the atoms that is three-dimensional and that constitute a molecule. It determines several properties of a substance including its reactivity, polarity, phase of matter, color, magnetism and biological activity.

:) Sry if this is confusing.