1. Consider the following statement:

   Propane gas will collect in basements because it is denser than air.

   Select the best answer.

   		The statement describes a physical property (density) of propane gas and air.
   		The statement describes a chemical property (density) of propane air only.
   		The statement describes a physical property (density) of propane gas only.
   		The statement describes a chemical property (density) of propane gas and air.
   		The statement describes a physical property (density) of propane air only.
   		The statement describes a chemical property (density) of propane gas only.