CHEMICAL FORMULAE & EQUATIONS 3.5 Chemical Formulae.
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Transcript of CHEMICAL FORMULAE & EQUATIONS 3.5 Chemical Formulae.
CHEMICAL FORMULAE & CHEMICAL FORMULAE & EQUATIONSEQUATIONS
3.5 Chemical Formulae3.5 Chemical Formulae
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.
3.5 Chemical Formulae
Empirical Formula
Molecular Formula
Calculation &
Determination
Chemical Formula
Numerical Problems
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.
CuSO4
Chemical Formula
3.5 Chemical Formulae
Information Information from from
chemical chemical formula formula
All the elements
present in the compound
Number of atoms of
each element
Calculate Mr or Relative
Formula Mass
3.5 Chemical Formulae
Formula that shows the simplest whole
number ratio of atoms of each element in the
compound
Empirical Formula
Elements X Y
Mass (g) or % of element
No. of moles of atoms
Ratio of moles
Simplest ratio of moles
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