F331 Keywords 4.5 / 5 based on 11 ratings ? ChemistryAcids, bases and saltsASOCR Created by: AvaniCreated on: 20-01-13 16:35 Octane Number Tendency of a fuel to auto ignite (high value = low tendency) 1 of 23 Half Life Time taken for half of a radioactive nuclei sample to decay 2 of 23 Nuclear Fusion Joining two or more nuclei to form a heavier nucleus of a new element 3 of 23 Entropy Measure of the number of ways molecules can be arranged 4 of 23 Catalyst speeds up a chemical reaction but can be recovered chemically unchanged at the end of the reaction 5 of 23 Endothermic Reaction that takes energy in from its surroundings, decreasing the temperature of the surroundings 6 of 23 Exothermic Reaction that gives out energy to its surroundings, increasing the temperature of its surroundings 7 of 23 Hess's Law As long as the starting and finishing points are the same, the enthalpy change for a chemical reaction will always be the same 8 of 23 Isotopes Elements with the same atomic number but have different mass numbers 9 of 23 Atomic Number Number of protons 10 of 23 Mass Number Number of protons and neutrons 11 of 23 Avogadro constant 6x10(23) - the number of particles in 1 mole of a substance 12 of 23 Bond Enthalpy Average energy required to break the bonds of 1 mole of gaseous compounds 13 of 23 Saturated All the bonds between carbon atoms are single bonds 14 of 23 Aliphatic Have no ring structures 15 of 23 Unsaturated Have one or more double carbon bonds between carbon atoms in a molecule 16 of 23 Aromatic Have one or more benzene rings in their structure 17 of 23 Heterogeneous Catalyst Catalyst in a different physical state to the reactants 18 of 23 Empirical Formula Simplest ratio of atoms of each element in a compound 19 of 23 Tracers Radioactive isotopes whose decay is monitored 20 of 23 Relative Atomic Mass Number of times an atom of an element is heavier than one-twelfth of an atom of Carbon-12 21 of 23 Relative Formula Mass Sum of the relative atomic masses for each atom in a formula 22 of 23 Molecular Formula The actual number of atoms of each element in a molecule 23 of 23
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