“A chemical property is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity.”

“Chemical properties are characteristics of a material that become evident when the material undergoes a chemical reaction or chemical change. People cannot observe chemical properties by simply viewing or touching a sample of the material; the actual structure of the material must be changed in order for people to observe the chemical properties.”

“The vast majority of the atmosphere is made up of nitrogen (78%) and oxygen (21%). The rest of the gases combined only account for about 1% of the atmosphere.”