Calculate the pka value of the weakly basic aromatic amine in procaine from the data given below. Absorbance of a fixed concentration of procaine in 0.1M HCI at 296 nm = 0.031; absorbance in 0.1M NaOH = 1.363; absorbance in buffer at pH 2.6=0.837.​

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine