In this Science Max Quiz, Phil explains how to differentiate chemical and physical changes. He mentions that chemical changes produce new molecules, while physical changes don't. He includes several examples of both physical and chemical changes.
Beakman challenge: drink punch out of a glass with two straws: one inside the glass and the other outside. The straw outside of the glass causes the air pressure inside the mouth to match the outside of the mouth. Now you don't have the ability to get the liquid to move into the mouth due to the air pressure change since it's the same.
Beakman acts as Bernouilli to explain his principle, how it involves air pressure, and how it affects planes. He uses a demo of blowing on a strip of paper to show that it lifts the paper due to changes in air pressure. Then he blows between two balloons, and they press together due to the decrease in air pressure between them. Beakman conducts a demonstration to show how to draw liquid out of a straw by changing the air pressure.