객관식
Which of the following substances has a standard enthalpy of formation equal to zero at 25°C and 1 atm?
35
views
8. Thermochemistry
Enthalpy of Formation
객관식
In the context of enthalpy of formation, what does it mean when the enthalpy change (ΔH) for a reaction is negative?
A
The reaction releases energy to the surroundings and is exothermic.
B
The reaction occurs only at high temperatures.
C
The reaction does not involve any energy change.
D
The reaction absorbs energy from the surroundings and is endothermic.
검증된 단계별 안내1
Understand that the enthalpy change (\$\(\Delta\) H\$) for a reaction represents the heat absorbed or released during the reaction at constant pressure.
Recognize that a negative value of \$\(\Delta\) H\$ means the system is losing heat to the surroundings.
Recall that when heat is released to the surroundings, the reaction is called exothermic.
Contrast this with a positive \$\(\Delta\) H\$, which indicates heat absorption and an endothermic reaction.
Therefore, a negative \$\(\Delta\) H\$ means the reaction releases energy to the surroundings and is exothermic.
관련 영상
관련 실천
