The fact that the classical gas laws are independent of the chemical nature of the gas is explicitly mentioned in all introductory texts and it is implicitly verified in many freshmen laboratory experiments. Graham's Laws of Effusion and Difussion introduce the experimental linear dependence of rate on the inverse square root of the molecular weight though theoretical derivations and putative experimental verifications are more complex than is commonly allowed. More advanced freshmen texts such as Mahan treat also of the viscosity, thermal conductivity, and diffusion of gases as do some supplementary paperbacks such as those by Cowling and by Hildebrand. Experimental study of these phenomena is, however, commonly left to the physical chemistry laboratory. This article describes simple ways in which the thermal conductivity, viscosity, and velocity of sound propagation of various gases can be semi-quantitatively measured (or demonstrated) at the freshman level. Recognition of the complex and decidedly non-linear ways in which these properties vary with the chemical nature of the gas is both salutary and, with a little effort, insightful. In particular, transport properties provide a useful entry to relative molecular parameters and the velocity of sound propagation in various gases provides a valuable macroscopic feeling for the magnitude of the microscopic root mean square velocity of molecules in those same gases.