Chemistry A-Level (AQA) : 3.1
(Introduction to organic chemistry) with
perfectly solved exam questions for high
results
What is empirical formula? - ANSWER-Simplest whole number ratio of atoms of each
element in a compound
What is molecular formula? - ANSWER-Actual number of atoms of each element in a
compound.
What is general formula? - ANSWER-Algebraic formula for a homologous series
What is structural formula? - ANSWER-Shows the unique arrangement of atoms in a
molecule in a simplified form, without showing all the bonds. Each carbon is written
separately, with the atoms or groups that are attached to it. Branches in the carbon
chains are shown in brackets.
What is displayed formula? - ANSWER-Shows every atom and every bond in the
molecule
What is skeletal formula? - ANSWER-Shows the bonds of the carbon skeleton only,
with any functional groups. Straight lines represent carbon-carbon bonds and carbon
atoms are assumed to be where the bonds meet. The hydrogen and carbon atoms are
not shown.
What is homologous series? - ANSWER-A family of organic compounds with the same
functional group, but different carbon chain length
What is functional group? - ANSWER-An atom or groups of atoms, which when present
in different molecules cause them to have similar chemical properties
(Introduction to organic chemistry) with
perfectly solved exam questions for high
results
What is empirical formula? - ANSWER-Simplest whole number ratio of atoms of each
element in a compound
What is molecular formula? - ANSWER-Actual number of atoms of each element in a
compound.
What is general formula? - ANSWER-Algebraic formula for a homologous series
What is structural formula? - ANSWER-Shows the unique arrangement of atoms in a
molecule in a simplified form, without showing all the bonds. Each carbon is written
separately, with the atoms or groups that are attached to it. Branches in the carbon
chains are shown in brackets.
What is displayed formula? - ANSWER-Shows every atom and every bond in the
molecule
What is skeletal formula? - ANSWER-Shows the bonds of the carbon skeleton only,
with any functional groups. Straight lines represent carbon-carbon bonds and carbon
atoms are assumed to be where the bonds meet. The hydrogen and carbon atoms are
not shown.
What is homologous series? - ANSWER-A family of organic compounds with the same
functional group, but different carbon chain length
What is functional group? - ANSWER-An atom or groups of atoms, which when present
in different molecules cause them to have similar chemical properties
