•Enthalpy of products > enthalpy of reactants, ΔH is positive
•Energy is absorbed by the system from the surrounding
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• The change of heat when 1 mole of a compound is formed from its elements at their standard states. H 2 (g) + ½ O 2(g) ...
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The enthalpy of solution , enthalpy of dissolution , or heat of solution is the enthalpy change associated with the dissolution of a subst...
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The heat (or enthalpy) of sublimation is the amount of energy that must be added to a solid at constant pressure in order to turn it direct...
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The enthalpy of neutralization ( Δ H n o ) is the change in enthalpy that occurs when an acid and base undergo a neutralization reaction...
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• The heat released when 1 mole of substance is burned completely in excess oxygen. C (s) + O 2(g) → CO 2(g) ∆ ...
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• The heat change when 1 mole of gaseous ions is hydrated in water . • e.g: Na + (g) ¾ ® Na + (aq) D H hyd = - 406 kJ mol -1 C...
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Ionic solids tend to be very stable compounds. The enthalpies of formation of the ionic molecules cannot alone account for this stability. ... -
Calorimetry is the process of measuring the amount of heat released or absorbed during a chemical reaction. Calorimetry is a way of deter... -
• The heat change when 1 mole of gaseous atoms is formed from its element • D H a is always positive because it involves only breakin...
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Thermochemistry is the study of the energy and heat associated with chemical reactions and/or physical transformations. A reaction may r...
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