The r values of 2 substances y and z were taken from a chromatogram run in 50% water and 50% ethanol solvent at 20 degrees

Aluminum–lithium (al-li) alloys have been developed by the aircraft industry to reduce the weight and improve the performance of its aircraft. a commercial aircraft skin material having a density of 2.47 g/cm3 is desired. compute the concentration of li (in wt%) that is required.

Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge

Why is the structure of molecule important to its function?