A student drops a 100 g sample of metal at 100 °C into 100 g of water initially at 25…
CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics
Problem
A student drops a 100 g sample of metal at 100 °C into 100 g of water initially at 25 °C inside an insulated calorimeter. The water temperature rises to 30 °C. If the student defines the water as the system, which of the following correctly states the sign of q for the water and classifies the thermal process for the system?
(a) q is positive; the process for the water is exothermic
(b) q is negative; the process for the water is endothermic
(c) q is positive; the process for the water is endothermic
(d) q is zero; the process for the water is neither endothermic nor exothermic