what are properties you can observe without changing a substance into a new substance?

Question

A.—properties you can observe without changing a substance into a new substance?

Answer 1

Well, you can observe (and even carefully measure) physical properties such as size, volume, weight, color, texture, etc. without changing a substance (and often without even touching it).  Think use of sight, hearing, and touch.

 

However, chemical properties require that a sample of the substance be converted into another substance in order to determine what reaction occurred.  Think taste and smell.  A blood test at the doctor's office is also a great example of this.