when heat is given out to surroundings, the reaction is exothermic
when heat is taken in from the surroundings, the reaction is endothermic
elements in standard state if they are in their normal state at 298K and 100kPa
standard enthalpy of combustion - enthalpy change when 1 mole of a compoiund completely burns in oxygen under standard conditions, all reactants and products in their standard states
standard enthalpy of formation - enthalpy change when 1 mole of a compoiund is formed from its constituent elements in their standard states, under standard conditions
the heat energy required to change a substance's temperature by a certain amount, is expressed by:
Q = mass x specific heat capacity x change in temperature
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