The water in two beakers, X and Y, is measured at $21.5\,^{\circ}\text{C}$. In beaker X, $5\,\text{g}$ of sodium chloride is added to the water. The temperature then falls to $18.0\,^{\circ}\text{C}$. In beaker Y, $5\,\text{g}$ of calcium oxide is added to the water. The temperature then increases to $29.4\,\circ\text{C}$. What types 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