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Fuels & Thermochemistry | Definitions
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Fuels & Thermochemistry | Definitions
Endothermic Reaction
A reaction in which heat is taken in or there is a decrease in surrounding temperature after the reaction occurs. ΔH is positive.
Exothermic Reaction
A reaction in which heat is liberated or the amount of heat in the surrounding environment increases after the reaction takes place. ΔH is negative.
Heat of Neutralisation
The heat change which occurs when one mole of H⁺ ions from an acid reacts with one mole of OH⁻ ions from a base to form one mole of water.
Heat of Reaction
The heat in kJ released or absorbed when the number of moles indicated in the balanced equation react completely.
Heat of Formation
The heat change in kJ which occurs when one mole of a compound is formed from its elements in their standard states.
Heat of Combustion
The heat change which occurs when one mole of a substance is burned completely in excess oxygen.
Hess' Law
The heat change for a given reaction depends only on the initial and final states of the system and is independent of the path followed.
Law of Conservation of Energy
Energy cannot be created or destroyed, it can only be changed from one form into another.
Bond Energy
The amount of energy in kJ needed to break one mole of bonds of the same type, with all species being in the gaseous state.
Kilogram Calorific Value
The heat energy produced per kilogram of fuel.
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Endothermic Reaction
A reaction in which heat is taken in or there is a decrease in surrounding temperature after the reaction occurs. ΔH is positive.
Exothermic Reaction
A reaction in which heat is liberated or the amount of heat in the surrounding environment increases after the reaction takes place. ΔH is negative.
Heat of Neutralisation
The heat change which occurs when one mole of H⁺ ions from an acid reacts with one mole of OH⁻ ions from a base to form one mole of water.
Heat of Reaction
The heat in kJ released or absorbed when the number of moles indicated in the balanced equation react completely.
Heat of Formation
The heat change in kJ which occurs when one mole of a compound is formed from its elements in their standard states.
Heat of Combustion
The heat change which occurs when one mole of a substance is burned completely in excess oxygen.
Hess' Law
The heat change for a given reaction depends only on the initial and final states of the system and is independent of the path followed.
Law of Conservation of Energy
Energy cannot be created or destroyed, it can only be changed from one form into another.
Bond Energy
The amount of energy in kJ needed to break one mole of bonds of the same type, with all species being in the gaseous state.
Kilogram Calorific Value
The heat energy produced per kilogram of fuel.