What are 6 substances you might find in the air?

Which suspect most likely committed the robbery and how do you know

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.