Types of Formulae
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What are the seven types of formulae?
1) General formula 2) Empirical formula 3) Molecular formula 4) Displayed formula 5) Structural formula 6) Skeletal formulae 7) Three - dimensional structural formulae
What is the general formula?
The algebraic formula used to describe any member of a family of compounds
What are the general formulas for alkanes, alkenes and alcohols?
Alkane = CnH2n+2 Alkene = CnH2n Alcohols = CnH2n+1OH
What is the empirical formula? (simplest)
The formula that gives the simplest ratio of atoms of each element in a compound
Empirical formula of butane?
C2H5
Molecular formula of butane?
C4H10
What is the molecular formula? (actual x, of each x, in one x)
Formula that gives the actual number of atoms of each element in one molecule
What is the displayed formula?
The formula that shows all the bonds and atoms in a molecule
Displayed formula of but - 2 - ene?
Check drawn answer
What is the structural formula?
The formula which shows the unique arrangement of atoms in a molecule in a simplified form, without showing all the bonds
Structural formula of butane?
CH3CH2CH2CH3
What is the skeletal formulae?
This formula uses lines to represent bonds Each point representing a C atom H atoms and bonds to H atoms are not usually shown Other atoms are shown (O, N, F, Cl, Br, I, S)
What is a three dimensional structural formulae?
This is an attempt to show the three dimensional structure of the molecule
Skeletal formula of but - 2 - ene?
Check drawn answer