Chapter 2 Energy from Fuels Flashcards
Law of conservation of energy
Energy cannot be created or destroyed, but it can be transformed.
System
The chemical reaction itself (combustion)
Surroundings
The surrounding environment (moisture, equipment, walls of container)
Exothermic
E is released, delta H is negative
Endothermic
E is absorbed, delta H is positive
Enthalpy/ Heat content
chemical energy of a substance
physical change
change of states, endothermic
chemical change
exothermic
activation energy
the minimum energy of collision of reactant particles required to break the bonds of the reactants so that products can form
heat of combustion
the enthalpy change that occurs when a specified amount of the fuel burns completely in oxygen. Usually measured at conditions of 298K and 100kPa which means water produced is in liquid state.
