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Definitions

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Term
Definition
Heat of Reaction   Is the heat change when the number of moles of reactants indicated in the balanced equation for the reaction react completely.  
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The Heat of Combustion   Is the The heat change when one mole of the substance is completely burned in excess oxygen  
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The kilogram calorific value of a fuel   The heat energy produced when 1 kg of the fuel is completely burned in oxygen  
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Bond Energy   Is the energy required to break one mole of covalent bonds and to separate the neutral atoms completely from each other  
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The heat of neutralisation   Is the heat change when one mole of H+ ions from an acid reacts with one mole of OH- ions from a base  
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A homologous series   - a series of compounds of uniform chemical type - Show gradations in physical properties - Has a general formula for its members -Each member has a similar method of preparation - Each member differs from the previous member by one CH2 unit  
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Structural Isomers   Compounds with the same molecular formula but a different structural formulas  
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An Aliphatic Compound   An organic compound that consists of of open chains of carbon atoms and closed chains compounds that resemble them in physical properties  
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Aromatic Compounds   Compounds that contain the Benzene ring structure in their molecules  
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The Octane number   Is a measure of the tendency of a fuel to resist knocking.  
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Catalytic Cracking   The breaking down of long-chain hydrocarbon molecules into short-chain molecules for which there is more demand.  
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Reforming   The use of catalysts to form ring compounds  
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Heat liberation formula   Heat liberated= m x c x (t2-t1)  
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The heat of formation   The heat change that takes place when one mole of a compound in its standard state is formed from its elements in their standard states.  
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Heat of Reaction   The heat change when the numbers of moles of reactants indicated in the balanced reaction react completely  
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Heat of Combustion   The heat change when one mole of a substance is completely burned in excess oxygen  
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The kilogram calorific value of a fuel   The heat change when one kilogram of the substance is completely burned in oxygen  
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Bond Energy   The energy required to separate one mole of covalent bonds and to separate the neutral atoms completely from each other  
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The Heat of Neutralisation   The heat change when one mole of H+ ions from an acid react with one mole of OH- ions from a base  
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Hess's Law   If a chemical reaction takes place in a number of stages, the sum of the heat changes in the separate stages is equal to the heat change if the reaction is carried out in one stage  
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The Law of Conservation of Energy   Energy cannot be created or destroyed but can only be changed from one form of energy into another  
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An unsaturated compound   A compound that contains at least one double, triple or multiple bond. Very reactive as a result. Undergoes addition.  
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