The temperature program for a separation starts at a temperature of 50°c and ramps the temperature up to 270°c at a rate of 10°c/minute. which statement is not true for this separation? a) at 10°c/minute, a total of 22 minutes is needed to reach 270°c. b) strongly retained solutes will remain at the head of the column while the temperature is low. c) weakly retained solutes will separate and elute early in the separation. d) the vapor pressure of strongly retained solutes will increase as temperature increases. e) strongly retained analytes will give broad peaks.

Which buffer would be better able to hold a steady ph on the addition of strong acid, buffer 1 or buffer 2? explain. buffer 1: a solution containing 0.10 m nh4cl and 1 m nh3. buffer 2: a solution containing 1 m nh4cl and 0.10 m nh3

How is the shape of the poem “peer” connected to its meaning?

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.