When solid NH NO dissolves in water

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

When solid NH

_4

_3

dissolves in water, the temperature of the solution decreases noticeably. Which of the following best describes the sign of

q

for the dissolving process and the direction of energy flow? (a)

q

for the solution is negative because heat flows out of the solution as its temperature falls. (b)

q

for the surroundings is negative because thermal energy leaves the surroundings. (c)

q

for the solution is positive because heat is absorbed from the solution’s surroundings. (d)

q

for the surroundings is positive because energy must be supplied as the solution cools.