It is generally seen that, when a substance absorbs heat energy, its heating curve shows two plateaus. which phenomenon is indicated by these plateaus? select one:

a. melting

b. boiling

c. phase change

d. crystallization

The following questions a24 - a26 relate to 100 ml of 0.0150 m solution of benzoic acid (c6h3cooh). ka(c6h3cooh) = 6.4 x 10^-5. what is the ph of the solution after the addition of 1 x 10^-3 moles of naoh? you may assume no volume change to the solution upon addition of the naoh.