Physical vs Chemical Properties

Physical vs Chemical Properties

Including extensive vs intensive

Open Ended

Give examples of the kinds of things you would use to describe a person's qualities.

Physical Properties

• Observing or measuring these things does NOT lead to a change in the IDENTITY of the substance

• Many of these are "abilities" of the substance, but measuring that ability does not fundamentally alter the substance

• ANYTHING around a phase change is physical

Chemical Properties

• Observing or measuring these things can ONLY be done during a change in the IDENTITY of the substance

• Many of these are also "abilities" of the substance, but measuring that ability REQUIRES altering the substance

• Key things to look for: "react", something that describes a chemical change (color, solid, energy changes, etc)

Multiple Select

Mark all of the physical properties listed

• being magnetic

• combustibile

• tarnishes in air

• melts @54 ^oC

• doesn't conduct heat

Intensive vs Extensive Properties

• Only Intensive properties can be used to identify a substance, looking at the examples given, why would that be?

• So what appears to be the difference between intensive and extensive?

• Intensive property - doesn't depend on the amount of matter, can be the same for ANY sample of a substance (some can be changed)

• Extensive property - completely depends on the amount of matter present, not very useful!

Multiple Select

Mark all of the intensive properties listed

• melting point

• density

• odor

• conductivity

• flammability