Given the equation representing a phase change at equilibrium:
h2o (s) < --> h2o (l)
which statement describes this equilibrium?
a. the h2o (s) melts fadter than the h2o (l) freezes
b. the h2o (l) freezes faster than the h2o melts
c. the mass of h2o (s) must equal the mass of h2o (l)
d. the mass of h2o (l) and the mass of h20 (s) each remain constant.

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt