F321 Chemistry

All the key words

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  • Created by: Fred
  • Created on: 20-12-11 22:43

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 Atomic Mass

The weighted mean mass of an atom 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 carbon-12.

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First Ionisation Energy

The energy required to remove one electron from each atom in one mole of gaseous atoms.

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Electron Shielding

The repulsion between electrons in different inner shells.

(Shielding reduces the overall attractive force from the positive nucleus. )

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Atomic Orbital

The region within an atom that can hold up to two electrons with opposite spins.

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Ionic Bonding

Electrostatic force of attraction between oppositely charged Ions.

(Bond between metal and non-metal)

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Covalent Bond

A bond formed by a shared pair of electrons.

(Bond between non-metal and non-metal)

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Dative/Coordinate Bond

Where the shared pair of electrons have both been donated by the same atom.

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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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Permanent Dipole

A small charge difference across a bond as a result of the difference in electro negativities of the bonded atoms.

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Polar Covalent Bond

Has a permanent dipole.

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Polar Molecule

Has an overall dipole when you take into account any dipole which arises across the bonds.

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Intermolecular Force

An attractive force between neighbouring molecules.

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Permanent Dipole-Dipole Force

A weak attractive force between permanent dipoles on neighbouring molecules.

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Van der Waals' Forces

Weak attractive forces between very small temporary dipoles in neighbouring molecules.

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Giant Metallic Lattice

A 3-dimensional lattice of positive ions in a 'sea' of delocalised electrons and they are bonded together by strong metallic bonding.

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Metallic Bonding

The electrostatic force of attraction between positive metal ions and the delocalised electrons.

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Giant Covalent Lattice

A 3-dimensional lattice structure of atoms bonded together by strong covalent bonds.

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Simple Covalent Lattice

A 3-dimensional structure of molecules bonded together by weak intermolecular forces.

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Acid

A species which can donateproton, H+(aq).

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Base

A species which can accept a protonH+(aq).

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Alkali

A type of base which dissolves in water to give hydroxide ions, OH-(aq).

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Mole

The amount of any substance containing as many particles as there are carbon atoms in exactly 12g of carbon-12 isotope.

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Molar Mass

The mass per mole of a substance. The units of molar mass are g mol^-1.

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Empirical Formula

The simplest whole-number ratio of atoms of each element present in the compound.

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Molecular Formula

The actual number of atoms of each element in a molecule.

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Molecule

A small group of atoms held together by covalent bonds.

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Moles Equation

Moles of solute / Volume of solution (dm^3) = Concentration of Solution (mol dm^3)

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Oxidation

LOSS of electrons

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Reduction

GAIN of electrons

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Redox Reaction

A reaction in which both oxidation and reduction take place.

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Period

horizontal row of elements in the periodic table.

Elements show trends in properties across a period.

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Group

vertical column in the periodic table.

Elements in a group have similar chemical properties as their atoms have the same number of outer shell electrons.

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Disproportionation

The oxidation and reduction of the same element in a redox reaction.

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Comments

Mariyah Jackson

Thanks for this..helpful in quick recaps :)

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