Chemistry Definitions

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  • Created by: amyspry1
  • Created on: 11-04-14 16:12
Relative Isotopic Mass
The mass of an atom of an isotope compared with 1/12th of the mass of an atom of Carbon-12.
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Relative Atomic Mass
The weighted mean mass of an element compared with 1/12th of the mass of an atom of Carbon-12.
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Relative Molecular Mass
The weighted mean mass of a molecule compared with 1/12th of the mass of an atom of Carbon-12.
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Relative Formula Mass
The weighted mean mass of a formula compared with 1/12th of the mass of an atom of Carbon-12.
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Empirical Formula
The simplest whole number ratio of atoms of each element present in a compound.
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Molecular Formula
The actual number of atoms of each element in a molecule.
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First Ionisation Energy
The energy required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions.
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Second Ionisation Energy
The energy required to remove one electron from each ion in one mole of gaseous 1+ ions to form one mole of gaseous 2+ ions.
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Acid
A species that is a proton donor.
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Base
A species that is a proton acceptor.
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Alkali
A type of base that dissolves in water forming hydroxide ions (OH-).
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Salt
Any chemical compound formed from an acid when a H+ ion from the acid has been replaced by a metal ion or another positive ion.
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Cation
A positively charged ion.
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Anion
A negatively charged ion.
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Anhydrous
A substance that contains no water molecules.
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Water of Crystallisation
Water molecules that form an essential part of the crystalline structure of a compound.
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Oxidation Number
The number of electrons that an atom uses to bond with atoms of another element.
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Oxidation
A loss of electrons.
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Reduction
A gain in electrons.
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Redox Reaction
A reaction in which both reduction and oxidation takes place.
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Reducing Agent
A reagent that reduces another species.
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Oxidising Agent
A reagent that oxidises another species.
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Disproportion Reaction
The oxidation and reduction of the same element in a redox reaction.
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Other cards in this set

Card 2

Front

Relative Atomic Mass

Back

The weighted mean mass of an element compared with 1/12th of the mass of an atom of Carbon-12.

Card 3

Front

Relative Molecular Mass

Back

Preview of the front of card 3

Card 4

Front

Relative Formula Mass

Back

Preview of the front of card 4

Card 5

Front

Empirical Formula

Back

Preview of the front of card 5
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