________can be easily observed without changing the composition of matter.

It is observed when a material changes its composition as a reaction to another material. 

A material can also be classified based on its ability to absorb water, to float, to sink, and to undergo decay. 

Depend only on the type of material and not on the amount of material. 

It describes how compact the parts of the material are. 

It is the shininess of the surface. 

It is a measurement of the amount of space a material or an object occupies. 

It can be used to identify, describe, and classify materials. 

Physical properties of matter can be measured. 

Physical properties are helpful in identifying unknown materials based on  the effect of their reaction to another material.