The densities, in grams per cubic centimeter, of certain transition elements are as follows: 8.95, 7.14, 8.90, 4.50, 7.43, 8.91, and 7.14. Wha the mean density of these transition elements?

Apeak with a retention time of 407 s has a width at half-height (w1/2) of 7.6 s. a neighboring peak is eluted 17 s later with a w1/2 of 9.4 s. a compound that is known not to be retained was eluted in 2.5 s. the peaks are not baseline resolved. how many theoretical plates would be needed to achieve a resolution of 1.5?

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.

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