Using the following values of pkb, select the strongest acid from those listed in the answers. a. c5h5n (pkb = 8.75) b. n2h4 (pkb = 5.77) c. c6h5nh2 (pkb = 9.37) d. nh3 (pkb = 4.75) e. c2h5nh2 (pkb = 3.19)

List four observations that indicate that a chemical reaction may be taking place

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest

How does the digestive system interact with the circulatory system? a. messages sent as electrical impulses from the digestive system are transported throughout the body by the circulatory system. b. nutrients taken in and broken down by the digestive system are carried to various parts of the body by the circulatory system. c. nutrients and gases are absorbed by organs in the circulatory system. then, they are transported to all parts of the body by organs in the digestive system. d. oxygen and carbon dioxide are exchanged by organs in the digestive system, and the gases are carried to the rest of the body by the circulatory system.