1.1 Formulae and equations 0.0 / 5 ? ChemistryFormulae and equationsASWJEC Created by: zopetre_Created on: 18-01-17 11:08 List of common compounds that are necessary to kno 1 of 5 List of common ions that are necessary to learn 2 of 5 What is the definition of oxidation number? Oxidation number is the number of electrons that need to be added to or taken away from an element to make it neutral. 3 of 5 What are the rules that apply to oxidation numbers The oxidation number of an uncombined element is 0. The sum of the oxidaton number in a compound is 0. The sum of the oxidation number in an ion equals the overall charge. In compounds the oxidation numbers of Group 1 metals is +1 and Group 2 metals is +2. The oxidation number of oxygen is -2 in compounds (except with fluorine or in peroxides or superoxides) The oxidation number of hydrogen is +1 in compounds (except in metal hydrides) In chemical species with atoms of more than one element, the most electronegative element is given the negative oxidation number. 4 of 5 What are the steps to balance an equation? Write a word equation for the reaction Write the symbols/formulae for each reactant and product Balance the equation by multiplying the formulae Check your answer Add state symbols 5 of 5
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