Chemical energetics Details Flashcards
Exothermic reactions…
give out energy
Endothermic reactions…
take in energy(from their surroundings)
In exothermic reactions, the temperature….
rises
In endothermic reactions, the temperature….
decreases
Formula for energy change
energy in - energy out
If the result of the energy change(energy in - energy out) is negative, the reaction is…
exothermic
If the result of the energy change(energy in - energy out) is positive, the reaction is…
endothermic
General formula for exothermic reactions
reactants → products + energy
General formula for endothermic reactions
reactants + energy → products
Making bonds…
releases energy(exothermic)
Breaking bonds…
takes in energy(endothermic)
If the energy taken to break bonds is less than the energy released in making bonds, the reaction is…
exothermic
If the energy taken to break bonds is greater than the energy released in making bonds, the reaction is…
endothermic
Bond energy
the energy needed to break bonds, or released when these bonds form
Activation energy
the minimum energy that particles must have to react
