EL and DF Definitions 0.0 / 5 ? ChemistryAll TopicsASOCR Created by: William JonesCreated on: 21-04-14 09:22 EL - Avagadro Constant 6.02 x10 23 1 of 23 EL - Empirical Formula Simplest ratio of atoms of each element in a compound 2 of 23 EL - Molecular Formula Actual ratio of atoms of each element in a compound 3 of 23 EL - Isotopes Same atomic number (number of protons), but different mass numbers (number of neutrons) 4 of 23 EL - Half Life Time taken for half the radioactive nuclei in a sample to decay 5 of 23 EL - Nuclear Fusion Is the joining together of two or more nuclei to form a heavier nucleus of a new element 6 of 23 EL - Absorption Spectrum Black lines on a coloured background 7 of 23 EL - Emission Spectrum Coloured lines on a black background 8 of 23 EL - Periodicity Regular pattern in a period 9 of 23 DF - Enthalpy Change of Combution Enthalpy change when 1 mole of a substance is completely combusted in oxygen under standard conditions. 10 of 23 DF - Enthalpy Change of Formation Enthalpy change when 1 mole of a substance is formed from it constituent elements in standard states and under standard conditions 11 of 23 DF - Entropy Measure of the number of ways particles can be arranged 12 of 23 DF - Saturated All single bonds 13 of 23 DF - Unsaturated Contains 1 or more double bond 14 of 23 DF - Aliphatic No benzene rings 15 of 23 DF - Arene/Aromatic Contains a benzene ring 16 of 23 DF - Structural Isomers Same molecular formula but different structural formulae 17 of 23 DF - Auto-ignition Explosion of a fuel without a spark 18 of 23 DF - Octane Number Measure of the tendancy of petrol to auto ignite 19 of 23 DF - Catalyst Speeds up a reaction without being used itself 20 of 23 DF - Heterogenous Catalyst Reactants are in a different state to catalyst 21 of 23 DF - What is made after cracking? Branched Alkane and a Alkene 22 of 23 What is made after a substance has been reformed? Cycloalkane and then arenes 23 of 23
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