DEFINITIONS - module 1

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Isotope
atoms of the same element with different numbers of neutrons (and different masses)
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Atomic number and mass number
AN = number of protons in the nucleus of the atom. MN = the number of particles (protons and neutrons) in the nucleus
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Relative atomic mass
the weighted mean mass of an atom of an element compared to 1/12th of the mass of an atom of C-12
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Relative isotopic mass
the mass of an atom of an isotope compared to 1/12th of the mass of an atom of C-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 C-12
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Relative molecular mass
the weighted mean mass of a molecule compared to 1/12th of the mass of an atom of C-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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Molar volume
The volume per mole of a gas (dm3). At room temp and pressure molar volume = 24dm3mol-1
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Standard solution
A solution of known concentration
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Acid
A species that is a proton donor
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Alkali
A type of base that dissolves in water forming hydroxide ions, OH-
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Base
A species that is a proton acceptor
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Salt
A chemical compound formed from an acid, when a H+ ion from an acid has been replaced by a metal ion/+ve ion, like NH4+
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Water of crystillisation
Water molecules that form an essential part of the crystalline structure of a compound
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Oxidation
Loss of electrons, or increase in oxidation number
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Reduction
Gain of electrons, or decrease in oxidation number
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Redox reaction
A reaction in which both oxidation and reduction take place
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Reducing agent
A reagent that reduces another species (adds e-s)
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Oxidising agent
A reagent that oxidises another species (takes e-s)
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Other cards in this set

Card 2

Front

AN = number of protons in the nucleus of the atom. MN = the number of particles (protons and neutrons) in the nucleus

Back

Atomic number and mass number

Card 3

Front

the weighted mean mass of an atom of an element compared to 1/12th of the mass of an atom of C-12

Back

Preview of the back of card 3

Card 4

Front

the mass of an atom of an isotope compared to 1/12th of the mass of an atom of C-12

Back

Preview of the back of card 4

Card 5

Front

the weighted mean mass of a formula unit compared to 1/12th of the mass of an atom of C-12

Back

Preview of the back of card 5
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