Module 1 F321 definitions

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  • Created by: Amy Mc
  • Created on: 20-02-15 17:08
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 particles in the nucleus
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Ion
A 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 1/12 of the mass of an atom of C-12
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Relative atomic mass
The weighted mean mass of an atom of an element compared with 1/12 of the mass of an atom of C-12
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Relative molecular mass
The weighted mean mass of a molecule compared with 1/12 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 with 1/12 of the mass of an atom of C-12
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Avogadro constant
The number of atoms per mole of the C-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 C-12 isotope
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Molar mass
The mass per mole of a substance
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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
The actual number of atoms of each element in a molecule
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Molar volume
The volume per mole of a gas
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Concentration
The amount of solute, in mol, dissolved per 1dm3 of solution
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Standard solution
A solution of known concentration
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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
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 is soluble in water, and dissolves to form hydroxide 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 ion or another cation
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Cation
A positively charged ion
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Anion
A 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
Water molecules that form an essential pat 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
Loss of electrons / increase in oxidation number
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Reduction
Gain of electrons / 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 another species
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Oxidation agent
A reagent that oxidises another species
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Other cards in this set

Card 2

Front

The number of protons in the nucleus of an atom

Back

Atomic number

Card 3

Front

The number of particles in the nucleus

Back

Preview of the back of card 3

Card 4

Front

A 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 1/12 of the mass of an atom of C-12

Back

Preview of the back of card 5
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