Chemistry Key Words From Spec

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Isoptope
atoms of an element with different numbers of neutrons and masses
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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 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 Molecular Mass
The weighted mean mass of a molecule compared with one-twelth 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 of which units is moles. Chemists use this as a way to count atoms
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Avogadro Constant
The number of particles per mole (6.02 x 10^23)
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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 each element present in a compound
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Molecular formula
The actual number of atoms in each element in a molecule
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Anhydrous
A substance which contains no water molecules
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Hydrated
A crystalline compound containing water molecules
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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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Oxidation
Loss of electrons or increase in oxidation number
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Reduction
Gain of electrons or a decrease in oxidation number
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First Ionisation Energy
The energy reguired to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions
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Successive Ionisation Energy
A measure of the energy required to remove each electron in turn
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Ionic Bonding
The electrostatic attraction between two oppositely charged ions
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Covalent Bonding
A shared pair of electrons
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Dative Bond
A shared pair of electrons which has been provided by one of the bonded atoms only
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Electronegativity
A measure of the attraction of a bonded atom for the pair of electrons in a covalent bond.
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Hydrogen Bonding
A strong dipole-dipole attraction between an electron deficient hydrogen molecule on one atom in a molecule and a lone pair of electrons on a highly electronegative atom on a different molecule
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Metallic Bonding
The electrostatic attraction between positive metal ions and delocalised electrons
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Van der Waals
Attractive forces between induced dipoles in neighbouring molecules
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General Formula
the simplest algebraic formula for a member of a homogolous group
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Structural Formula
The minimal detail that shows the arrangment of the atoms in a molecule
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Skeletal Formula
the simplified organic formula shown by just leaving the carbon skeleton and associated functional groups
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Displayed Formula
the realtive positioning of atoms and the bonds between them
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Homologous series
A series of organic compounds having the same functional group but with each successive member differing my CH2
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Functional Group
A group of atoms responsible for the characterictic reactions of a compound
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Structural isomers
Compounds with the same molecular formula but different structural formulas
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Radical
A species with an unpaired electron
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Electrophile
An electron pair acceptor
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Nucleophile
An electron pair donor
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Other cards in this set

Card 2

Front

The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of Carbon-12

Back

Relative Atomic Mass

Card 3

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 3

Card 4

Front

The weighted mean mass of a molecule compared with one-twelth of the mass of an atom of carbon-12.

Back

Preview of the back of card 4

Card 5

Front

The weighted mean mass of a formula unit 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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