Chemistry F321 Definitions

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  • Created by: WarHorse
  • Created on: 19-03-14 21:31
Relative Isotopic Mass (RIM)
Is the mass of an atom/isotope compared to 1/12th of the mass of an atom of C-12
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Relative Atomic Mass (RAM, Ar)
Is the weighted mean/average mass of the atoms of all naturally occuring isoptopes of an element, compared to 1/12th the mass of C-12
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Relative Formula Mass (RFM)
Is the weighted mean/average mass of the molecules of a substance compared to 1/12th the mass of an atom of C-12Realtive
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Relative Molecular Mass (RMM)
Is the weighted mean/average mass of the molecules of a substance compared to 1/12th the mass of an atom of C-12. (The mass of the molecule = the sum of the realtive atomic masses of the atoms in the molecule)
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Emperical Formula
Is the simplest whole number ration of atoms in a compound
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Molecular Formula
Is the actual numbers of atomes of each element in a molecule
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Atomic Number
Is the number of protons in the nucleus of an atom
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Mass (Nucleon) Number
Is the number of protons + neutrons in the nucleus of an atom
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Isotopes
Are atoms of the same element with a different mass. The isotopes of an element have the same number of protons (and electrons), but different numbers of neutrons
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1st Ionisation Energy
Is the energy required to remove 1 electron from each atom in 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions
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2nd Ionisation Energy
Is the energy required to remove 1 electron from each 1+ ion in the 1 mole of gaseous 1+ ions to form 1 mole of gaseous 2+ ions
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Nth Ionisation Energy
Is the energy required to remove 1 electron from each (n-1)+ ion in 1 mole of gaseous (n-1)+ ions to form 1 mole of gaseous n+ ions
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Ionic Bond
Is the electrostatic attraction between oppositely charge ions
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Covalent Bond
Is a shared pair of electrons
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Dative Covalent Bond
Is a shared pair of electrons with only one of the atoms contributing both electrons
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Electron Pair Repulsion Theory
States that electron pairs repel each other and the number (and type) of electron pairs around the central atom determines the shape of the covalent molecule.
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The Order of Repulsion
Lone pair/lone pair > lone pair/bonded pair > bonded pair/bonded pair
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Electronegativity
Is the attraction that each bonded atom has for the pair of electrons in the covalent bond
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Polar Bond
Is a covalent bond between two atoms with different electronegativities in which the bonded electron pair is drawn close to the more electronegative atom
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Polar Molecule
Is a molecule in which the electron density is not equally distributed resulting in areas of high electron density (delta minus) and areas of low electron density (delta plus)
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Metallic Bonding
Is the attraction between postitive ions and delocalised electrons
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Base
Is a proton acceptor
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Acid
Is a proton donor
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Salt
Is formed when the proton (H+) in an acid is replaced by either a metal ion or an ammoninum ion (NH4+)
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Oxidation
Involves the loss of elctrons or an increase in the oxidation number
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Reduction
Involves the gain of electrons or an decrease in the oxidation number
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Other cards in this set

Card 2

Front

Is the weighted mean/average mass of the atoms of all naturally occuring isoptopes of an element, compared to 1/12th the mass of C-12

Back

Relative Atomic Mass (RAM, Ar)

Card 3

Front

Is the weighted mean/average mass of the molecules of a substance compared to 1/12th the mass of an atom of C-12Realtive

Back

Preview of the back of card 3

Card 4

Front

Is the weighted mean/average mass of the molecules of a substance compared to 1/12th the mass of an atom of C-12. (The mass of the molecule = the sum of the realtive atomic masses of the atoms in the molecule)

Back

Preview of the back of card 4

Card 5

Front

Is the simplest whole number ration of atoms in a compound

Back

Preview of the back of card 5
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