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Page 1

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Key Words and Definitions
~ Unit 1 and Unit 2 ~
Atomic Structure
Relative Atomic Mass (Ar) ­ Average mass of an atom/element
1
/
mass of one atom of C12
12


Relative Molecular Mass (Mr) ­ Average mass of a molecule
1
/
mass of one atom of C12…

Page 2

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Bonding Definitions
Ionic Bond ­ The electrostatic attraction between positive and negative ions held in a crystal lattice

Single Covalent Bond ­ When 2 electrons are shared in a covalent bond between two non-metals

Double Covalent Bond ­ When 4 electrons are shared in a covalent bond between two non-metals…

Page 3

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Collision Theory ­ This states that particles must collide with enough energy and with the correct
............................orientation to break the bonds between them

Catalyst ­ A substance that speeds up the reaction but is not chemically unchanged or used up at the end ...............of
the reaction

Heterogeneous Catalyst ­ A…

Page 4

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Key Words and Definitions
~ Unit 3 ~
Isomerism
Structural Isomer ­ Compound with the same molecular formula but has a different structural formula

Positional Isomer ­ Structural isomers that differ by having functional group in different place

Functional Group Isomer ­ Structural isomers that differ by having a different…

Page 5

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Hydrolysis ­ Reaction involving breaking of bonds with addition of water

CFCs ­ These are compounds containing carbon, chlorine and fluorine atoms, also known as
...........chlorofluorocarbons

Nucleophiles
Nucleophiles ­ Lone pair donor

Substitution reaction ­ When an atom/group replaces another atom/group

Elimination Reaction ­ When a molecule is lost from…

Page 6

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