The temperature of the water in two beakers, X and Y, is recorded as $21.5\,^{\circ}\text{C}$. $5\,\text{g}$ of sodium chloride is added to the water in beaker X. The temperature then falls to $18.0\,^{\circ}\text{C}$. $5\,\text{g}$ of calcium oxide is added to the water in beaker Y. The temperature then rises to $29.4\,^{\circ}\text{C}$. What kinds of process are taking place in beakers X and Y?
- AX: endothermic; Y: endothermic
- BX: endothermic; Y: exothermic
- CX: exothermic; Y: endothermic
- DX: exothermic; Y: exothermic