Classify everyday materials contains chemicals, chemical reaction, or neither

Before we begin, let's first establish an understanding of basic terminology. It may be harder than you think to clearly define what is a chemical versus a chemical reaction. To help us better differentiate between closely related terms, review the words listed here.

 

Okay, so before we start, we must establish and clear understanding of the basic terminology. In order to help us differentiate among closely related terms, please kindly review the words listed below. There are 3 categories:

contains chemicals,

chemical reaction,

or neither  
 
Substances whose fundamental properties do not change, making it possible, for instance, to test for a specific chemical in a pool of water might be a useful information to remember regarding chemicals.  
 

Mass is one example of these unchanging properties. Therefore, if you can locate the mass of a specific substance’s concentration, then it can be concluded as chemical.

Ido not understand. 

Electrons are emitted