Step 1: Understand what a polar molecule is. A polar molecule has a positive end and a negative end due to an uneven distribution of electrons.
Step 2: Look at the structure of ammonia (NH3). It has three hydrogen atoms and one nitrogen atom.
Step 3: Identify the shape of ammonia. It has a trigonal pyramidal shape because the nitrogen atom has a lone pair of electrons that pushes the hydrogen atoms down.
Step 4: Recognize that the nitrogen atom is more electronegative than hydrogen, meaning it pulls the shared electrons closer to itself.
Step 5: Conclude that because of the shape and the difference in electronegativity, ammonia has a positive end (hydrogens) and a negative end (nitrogen), making it a polar molecule.
