The minimum energy required to cause an electron to be emitted from a clean zinc surface is 6.9 x 10^-19. (a) Calculate the maximum wavelength of electromagnetic radiation which will cause an electron to be emitted from the clean zinc surface.
(b)What would be the effect of irradiating a clean zinc surface with radition of wavelength 4.0x 10^-7? You must justify your answer.

The reaction q+r2=r2q is found to be first order in r2 and

For the following dehydrohalogenation (e2) reaction, draw the zaitsev product(s) resulting from elimination involving c3–c4 (i.e., the carbon atoms depicted with stereobonds). show the product stereochemistry clearly. if there is more than one organic product, both products may be drawn in the same box. ignore elimination involving c3 or c4 and any carbon atom other than c4 or c3.

__can be defined as which velocity changes