Question

For an endothermic reaction, circle the correct sign of qcal, qsoln, and qrxn.

a) qcal (+), qsoln (-), qrxn (+)
b) qcal (-), qsoln (+), qrxn (-)
c) qcal (-), qsoln (-), qrxn (-)
d) qcal (+), qsoln (+), qrxn (+)

Answer 1

The correct sign for an endothermic reaction is: qcal (+), qsoln (-), qrxn (+). For an endothermic reaction, heat is absorbed by the system from the surroundings. The temperature of the surroundings decreases, and the system gains heat. Therefore, qcal is positive because the system is gaining heat, qsoln is negative because heat is being absorbed from the surroundings, and qrxn is positive because heat is gained by the system.

Step-by-step explanation:

The correct sign for an endothermic reaction is: qcal (+), qsoln (-), qrxn (+).

For an endothermic reaction, heat is absorbed by the system from the surroundings. The temperature of the surroundings decreases, and the system gains heat. Therefore, qcal is positive because the system is gaining heat, qsoln is negative because heat is being absorbed from the surroundings, and qrxn is positive because heat is gained by the system.