F321, Module1 - Key Definitions

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Isotopes
Atoms of the same element with different numbers of Neutrons
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Atomic(proton) number
The number of protons in the nucleas of an atom
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Mass (nucleon) Number
The number of particles (protons and neutrons) in the nucleas of an atom
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An ion
A positively or negatively charged atom or (covalently bonded) group of atoms (a molecular ion)
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Relative isotopic mass
The massnof 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
The weighted mean mass of an atom of an element compared with one twelfth 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 one twelfth of the mass of an atom of Carbon-12
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Relative formula mass
The weighted mean mass of a formula unit compared with one twelfth of the mass of an atom of Carbon-12
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Amount of substance
The quantity whose unit is the mole. Chemists use 'amount of substance' as a means of counting atoms
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The Avogadro Constant, Na
The number of atoms per mole of the Carbon-12 isotope (6.02 * 10^-3)
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A mole
The amount of any substance containing as many particles as the are carbon atoms in exactly 12g of the Carbon-12 isotope
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Molar mass, Mr
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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A molecule
A small group of atoms held together by covalent bonds
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The 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 a solute, in mol, dissolved per 1dm^3 (1000cm^3) of solution
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A 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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An acid
A proton donor
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A base
A proton accecptor
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An alkali
A type of base that dissolves in water forming hydroxide ions, OH-
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A 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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A cation
A positively charged ion
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An 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 the contains no water molecules
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Water of crystallisation
Refers to water molecules the 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 an atom of another element
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Oxidation
Loss of electrons
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Reduction
Gain of electrons
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A redox reaction
A reaction in which both reduction and oxidation both take place
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A reducing agent
A reagent which reduces another species
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An oxidising agent
A reagent which oxidises another species
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Other cards in this set

Card 2

Front

The number of protons in the nucleas of an atom

Back

Atomic(proton) number

Card 3

Front

The number of particles (protons and neutrons) in the nucleas of an atom

Back

Preview of the back of card 3

Card 4

Front

A positively or negatively charged atom or (covalently bonded) group of atoms (a molecular ion)

Back

Preview of the back of card 4

Card 5

Front

The massnof 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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