F321 Definitions

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  • Created by: Luke C
  • Created on: 15-05-13 12:05
Isotopes
Atoms of the same element with different numbers of neutrons
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Atomic number
The number of protons in the nucleus of an atom
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Mass number
The number of protons and neutrons in an atom
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Ion
A positivley or negativley charged atom or molecule
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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 atom 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 an atom of carbon-12
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Relative formula mass
The weighted mean mass of a formula unit compared to 1/12th of the mass of an atom of carbon-12
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Amount of substance
The quantity whose units is the mole
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Avogadro Constant
The number of atoms per mole of carbon-12 (6.02x10^23)
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A mole
The amount of substance containing as many particles as there are carbon-12 atoms in 12g of carbon-12
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Molar mass
The mass per mole of substance. The units of molar mass are g mol^-1
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Empirical formula
The simplest whole number ratio of atoms of each element present in a compound
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Molecule
A small group of atoms held together by covalent bonds
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Molecular formula
Actual number of atoms of each element in a molecule
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Molar volume
The volume per mole of gas. At RTP this is 24.0 dm^3
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Concentration
The amount of solute in moles dissolved per dm^3 of solution
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Standard solution
A solution of known concentration
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Species
Any particle that takes part in a chemical reaction
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Stoichiometry
The molar relationship between the relative quantities of substances taking part in a reaction
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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 base that dissolves in water forming hydroxide ions (OH-)
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Salt
A compound formed from an acid when the H+ of an acid is replaced by a metal ion or other positivley charged ions
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Cation
A positively charged ion
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Anion
A negatively charged ion
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Hydrated
A crystalline compound containing water molecules
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Anhydrous
A compound containing no water molecules
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Water of crystallisation
Water that forms the essential part of the crystalline structure of a compound
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Oxidation number
A measure of the number of electrons that an atom uses to bond with atoms of another element
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Oxidation
A loss of electrons and an increase in oxidation number
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Reduction
Gain of electrons and a decrease in oxidation number
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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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Redox reaction
A reaction in which both oxidation and reduction take place
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Other cards in this set

Card 2

Front

Atomic number

Back

The number of protons in the nucleus of an atom

Card 3

Front

Mass number

Back

Preview of the front of card 3

Card 4

Front

Ion

Back

Preview of the front of card 4

Card 5

Front

Relative isotopic mass

Back

Preview of the front of card 5
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