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Organic Chemistry
Definitions
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. |
The Heat of Combustion | Is the The heat change when one mole of the substance is completely burned in excess oxygen |
The kilogram calorific value of a fuel | The heat energy produced when 1 kg of the fuel is completely burned in oxygen |
Bond Energy | Is the energy required to break one mole of covalent bonds and to separate the neutral atoms completely from each other |
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 |
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 |
Structural Isomers | Compounds with the same molecular formula but a different structural formulas |
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 |
Aromatic Compounds | Compounds that contain the Benzene ring structure in their molecules |
The Octane number | Is a measure of the tendency of a fuel to resist knocking. |
Catalytic Cracking | The breaking down of long-chain hydrocarbon molecules into short-chain molecules for which there is more demand. |
Reforming | The use of catalysts to form ring compounds |
Heat liberation formula | Heat liberated= m x c x (t2-t1) |
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. |
Heat of Reaction | The heat change when the numbers of moles of reactants indicated in the balanced reaction react completely |
Heat of Combustion | The heat change when one mole of a substance is completely burned in excess oxygen |
The kilogram calorific value of a fuel | The heat change when one kilogram of the substance is completely burned in oxygen |
Bond Energy | The energy required to separate one mole of covalent bonds and to separate the neutral atoms completely from each other |
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 |
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 |
The Law of Conservation of Energy | Energy cannot be created or destroyed but can only be changed from one form of energy into another |
An unsaturated compound | A compound that contains at least one double, triple or multiple bond. Very reactive as a result. Undergoes addition. |