Chemistry Definitions: F321, Module 1

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Isotope
Atoms of the same element with different numbers of neutrons
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Atomic number
Number of protons in the nucleus of the atom
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Mass number
Number of protons and neutrons in the nucleus
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Ion
Positively or negatively charged atom or group of atoms
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Relative Isotopic Mass
The mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon-12
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Relative Atomic Mass, Ar
The weighted mean mass of an atom of an element compared with...
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Relative Molecular Mass, Mr
The weighted mean mass of a molecule compared with...
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Relative Formula Mass
The weighted mean mass of a formula unit compared with...
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Amount of Substance
The quantity whose unit is the mole - used as a means of counting atoms
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The Avogadro Constant
(6.02 x 10[23] mol-1) The number of atoms per mole of the carbon-12 isotope
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Mole
The amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the carbon-12 isotope
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Molar Mass, M
The mass per mole of a substance whose units 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
Small group of atoms held together by covalent bonds
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Molecular Formula
The actual number of atoms of each element in a molecule
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Molar Volume
The volume per mole of a gas whose units are dm[3] mol-1. At RTP the molar volume is approx. 24.0 dm[3] mol-1
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Concentration
(of a solution) is the amount of solute, in mol, dissolved per 1dm[3] of solution
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Standard Solution
A solution of known concentration, normally used in titrations to determine unknown information about another substance
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Species
Any type of particle that takes place 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
Species that is a proton donor, they release H+ ions (protons) when added to water
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Base
Species that is a proton acceptor (accepts H+)
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Alkali
A type of base that dissolves in water forming OH-(aq) ions
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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 or positive ion
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Cation
Positively charged ion
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Anion
Negatively charged ion
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Hydrated
Refers to a crystalline compound containing water molecules
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Anhydrous
Refers to a substance that contains no water molecules
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Water of Crystallisation
Refers to water molecules that form an 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. They are derived from a set of rules
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Oxidation
Loss of electrons or an increase in oxidation number
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Reduction
Gain of electrons or a decrease in oxidation number
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Redox Reaction
A reaction in which both reduction and oxidation take place
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Reducing Agent
A reagent that reduces (adds electrons to) another species
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Oxidising Agent
A reagent that oxidises (takes electrons from) another species
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Other cards in this set

Card 2

Front

Number of protons in the nucleus of the atom

Back

Atomic number

Card 3

Front

Number of protons and neutrons in the nucleus

Back

Preview of the back of card 3

Card 4

Front

Positively or negatively charged atom or group of atoms

Back

Preview of the back of card 4

Card 5

Front

The mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon-12

Back

Preview of the back of card 5
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