What do these two changes have in common? snails growing shells a slice of banana turning brown

How many moles of bromine are needed to produce 3.23 moles of potassium bromide

The solid xy decomposes into gaseous x and y: xy(s) m x(g) + y(g) kp = 4.1 (at 0 °c) if the reaction is carried out in a 22.4 l container, which initial amounts of x and y will result in the formation of solid xy?

In which of the following phases of matter do molecules have the highest amount of energy? a. liquid b. gel c. solid d. gas