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Rules for writing equations

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  • 1. 3. The names of the products.A word equation is used as a quick,shorthand way of writing a chemicalreaction.There are always three parts to a word equation:1. The names of the reactants.2. An arrow.What is the word equation for hydrogen reacting withoxygen to form water?Word Equation
  • 2. Rule 1: When two elements combinethe ending is usually ” ……………ide”.metal goes firstSodium ChlorideMagnesium OxideIron SulphideNa ClMgOFe S
  • 3. Rule 2: When three or more differentelements combine and one of them isOxygen, the ending will be “………ate”.metal goes firstCopper SulphateCalcium CarbonateCuSOOOOCaCOOO
  • 4. Rule 3: When two identical elementscombine, the name does not change.H2 = HydrogenF2 = FluorineN2 = NitrogenCl2 = ChlorineO = OxygenH HN NO OF FCl Cl

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