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Published byClarissa Sharp Modified over 9 years ago
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CHEMICAL FORMULAE & EQUATIONS 3.5 Chemical Formulae
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At the end of this lesson, you should be able to: 3.5 Chemical Formulae 1.State the meaning of chemical formula. 2.State the meaning of empirical formula. 3.State the meaning of molecular formula. 4.Determine empirical & molecular formula of substances. 5.Compare and contrast empirical formula with molecular formula. 6.Solve numerical problems involving empirical & molecular formula.
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3.5 Chemical Formulae Empirical Formula Molecular Formula Calculation & Determination Chemical Formula Numerical Problems
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Copper (II) Sulphate 3.5 Chemical Formulae Representation of a chemical substance using letters for atoms and subscript numbers to show the numbers of each type of atoms that are present in the substance. CuSO 4 Chemical Formula
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3.5 Chemical Formulae Information from chemical formula All the elements present in the compound Number of atoms of each element Calculate M r or Relative Formula Mass
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3.5 Chemical Formulae Formula that shows the simplest whole number ratio of atoms of each element in the compound Empirical Formula ElementsXY Mass (g) or % of element No. of moles of atoms Ratio of moles Simplest ratio of moles
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3.5 Chemical Formulae Molecular Formula Formula that shows the actual number of atoms of each element that are present in the compound Molecular Formula = ( Empirical Formula )n
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