Chemistry Definitions

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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–(aq) ions.
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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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anhydrous
A substance that contains no water molecules.
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anion
A negatively charged ion.
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Avogadro constant, NA
The number of atoms per mole of the carbon-12 isotope
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base
A species that is a proton acceptor.
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compound
A substance formed from two or more chemically bonded elements in a fixed ratio, usually shown by a chemical formula
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concentration
The amount of solute, in mol, per 1 dm3 (1000 cm3) of solution.
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hydrated
Crystalline and containing water molecules.
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ion
A positively or negatively charge atom or (covalently bonded) group of atoms (a molecular ion).
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molar mass, M
The mass of 1 mole of a substance. The units of molar mass are g mol–1.
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mole
The amount of any substance containing as many particles as there are carbon atoms in exactly 12 g of the carbon-12 isotope.
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molecular formula
The number of atoms of each element in a molecule.
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relative atomic mass, Ar
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 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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relative molecular mass, Mr
The weighted mean mass of a molecule compared with one-twelfth of the mass of an atom of carbon-12.
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Salt
A chemical compound formed from an acid, when a H+ ion from the acid has been replaced by a metal ion or another positive ion, such as the ammonium ion, NH4+.
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species
Any type of particle that takes part in a chemical reaction.
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spectator ions
Ions that are present but take no part in a chemical reaction.
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standard solution
A solution of known concentration. Standard solutions are normally used in titrations to determine unknown information about another substance.
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stoichiometry
The molar relationship between the relative quantities of substances taking part in a reaction.
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water of crystallisation
Water molecules that form an essential part of the crystalline structure of a compound.
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Card 2

Front

A type of base that dissolves in water forming hydroxide ions, OH–(aq) ions.

Back

alkali

Card 3

Front

The quantity whose unit is the mole. Chemists use ‘amount of substance’ as a means of counting atoms.

Back

Preview of the back of card 3

Card 4

Front

A substance that contains no water molecules.

Back

Preview of the back of card 4

Card 5

Front

A negatively charged ion.

Back

Preview of the back of card 5
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