A level Chem Polar Bonds and Polar Molecules

What is a dipole?

A difference in electronegativity

How do we show that a bond is polar?

• write delta positive and delta negative

• Draw an arrow below the bond

What does delta mean?

Little change

Why doe we use delta to identify polarity?

Because the electron pair only shifted towards the more electronegative atom

In terms of electronegativity what sign will go to the more electronegative element?

Delta negative

In terms of electronegativity what sign will go to the less electronegative element?

Delta positive

Regarding the arrow below the bond what does the arrow point towards?

The more electronegative element.

What is an overal polarity?

When a compound has a polar bond

What is another name for overall polarity?

A dipole moment

In carbon dioxide why do the 2 polar bonds cancel out?

The 2 oxygens are the most electronegative atoms and they point away from each other in a straight line