Multiple Choice
Which term best describes a chemical reaction in which energy is absorbed from the surroundings?
102
views
8. Thermochemistry
Endothermic & Exothermic Reactions
Multiple Choice
A positive value for ΔH for a chemical reaction is an indication of which of the following?
A
The reaction produces more products than reactants.
B
The reaction occurs spontaneously at all temperatures.
C
The reaction is endothermic and absorbs heat from the surroundings.
D
The reaction is exothermic and releases heat to the surroundings.
Verified step by step guidance1
Understand that \( \Delta H \) represents the enthalpy change of a reaction, which indicates the heat absorbed or released during the reaction at constant pressure.
Recall that a positive value of \( \Delta H \) means the system absorbs heat from the surroundings, which characterizes an endothermic process.
Recognize that an endothermic reaction requires energy input, so it is not necessarily spontaneous at all temperatures; spontaneity depends on both enthalpy and entropy changes.
Note that the amount of products compared to reactants is not directly indicated by the sign of \( \Delta H \); it relates more to reaction equilibrium and kinetics.
Conclude that a positive \( \Delta H \) means the reaction is endothermic and absorbs heat from the surroundings, distinguishing it from exothermic reactions where \( \Delta H \) is negative.
Related Videos
Related Practice
