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Energetics
Bond making releases energy- exothermic
Bond breaking requires energy- endothermic
1. EXOTHERMIC REACTION
e.g. burning and rusting
Substance involved in this type of reaction gets hotter, as
chemical energy is converted into thermal energy.
During the chemical reaction, energy is lost by the
chemicals, so is gained by the surroundings
Therefore, enthalpy change H is negative
2. ENDOTHERMIC REACTION
e.g.…read more

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You can use J- the heat change to find the enthalpy change, you must, divide J,
by 1000 to convert into KJ, and then divide by 1000 again as enthalpy change
is measures in Kj/mol.
Enthalpy (H) The heat energy stored in a chemical
system.
Enthalpy change (H) The heat energy change at constant
pressure
Standard enthalpy of The enthalpy change when one mole
formation( H f) of a compound is formed from its
elements in their standard states,
under standard conditions.…read more

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