4. When NH4NO3 is dissolved in water, the temperature of the water decreases. When NaOH is dissolved in a
separate water sample, the temperature of the water
increases. Based on these observations, it can be
concluded that the dissolving of
A) both salts is endothermic
B) both salts is exothermic
C) NH4NO3 is endothermic and the dissolving of
NaOH is exothermic
D) NH4NO3 is exothermic and the dissolving of
NaOH is endothermic