Enthalpy Changes Flashcards
Definition of enthalpy change?
The heat energy change measured at constant pressure
Exothermic- temperature increase or decrease of surroundings?
Increase
Exothermic- breaking or forming bonds?
Forming
Exothermic- producing or releasing energy?
Produces energy
Exothermic- is more or less energy released from bond making than is absorbed during bond breaking?
More
Endothermic- temperature increase or decrease of surroundings?
Decrease
Endothermic- breaking or forming bonds?
Breaking
Endothermic- produces or requires energy?
Requires energy
Endothermic- more or less energy is released from bond making than is absorbed during bond breaking?
Less energy
Definition of Exothermic reaction?
The enthalpy of the products is lower than the enthalpy of the reactants- energy is released and the enthalpy change is negative
Definition of endothermic reaction?
The enthalpy of the products is higher than the enthalpy of the reactants- energy is absorbed and the enthalpy change is positive
Examples of Exothermic reactions?
Combustion
Examples of endothermic reactions?
Photosynthesis, decomposition of carbonates
