What is the main difference between physical properties and chemical propertiesgive an example of each

Chemical properties are only observed during a chemical reaction and thus changing the substance's chemical composition. Perhaps the best way to distinguish between the two is by examples. Examples of physical properties would include freezing, melting, and boiling points, density, mass, and volume.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.