bond entalpy | energy needed to break 1 mol of particular covalent bond in gassous molecule in standard state | |
average bond entalpy | average entalpies needed to break 1 mol of particular covalent bond in gassous molecule in standard | |
entalpy change of reaction | energy change of reaction under standard state | |
exothermic reaction | energy is released | |
endothermic reaction | energy in absorbed | |
combustion, neutralization, condensing gasses, freezing liquids | exothermic reaction | |
energy to break bonds is less than to make bonds | exothermic | |
energy to break bonds is more than to make bonds | endothermic | |
melting ice, boiling water, dissolving | endothermic reaction | |
standard entalpy change of formation | energy change when 1 mol of a compound is formed from its constituing elements in the standard state | |
standard entalpy change of combustion | entalpy change when 1 mol of the substance burns completely under standard state | |