Please help me to chose the best answer

Question

A) Chemical changes are associated primarily extensive properties.
B) Chemical changes are easily reversed by altering the temperature of the system.
C) Chemical changes provide the only valid basic for identification of a substance.
D) Physical properties are mostly extensive in nature.
I couldn't chose the best statement because I think that they are not really true. please help me! thanks!

Answer 1

I have to agree with you.  Let us look at these in turn.

 

(A) is false, because chemical changes may be associated with intensive properties, such as temperature, pressure, density, and not just extensive properties such as volume and mass.

 

(B) is false.  Many chemical processes are irreversible, such as combustion.

 

(C) is false.  For example, optical properties of a substance may be used to identify it. 

 

(D) is false, as there are many intensive physical properties, such as temperature, pressure, density, specific heats, and others.

 

The study guide, quiz, or whatever needs another choice: (E) None of the above.