Which statement is correct about the changes in fauna’s during one of these five major events?

Calculate the expected ph values of the buffer systems from the experiments (a,b,c,d), using the henderson- hasselbalch equation, ph-pka+log[a-]/[ha]. use for pka values carbonic acid= 6.37, and acetic acid= 4.75.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o