chemistry

  • Created by: maiwand
  • Created on: 07-04-13 19:08
First ionisation energy
Of an element is the energy required to remove 1 electron from each atom in 1 mole of gaseous atoms
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atomic orbital
is a region within an atom that can hold up two electrons,with oppsite spins
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ionic bonding
electrostatic attraction between two oppositely charged ions
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covalent bond
is a bond formed by a shared pair of electrons
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dative covalent bond
is a shaped pair of electron which has been provided by one of the bonding atoms only
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simple molecular lattice
is a 3D structure of molecules,bonded together by weak intermolecular forces
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electronegativity
the ability of an atom to attract the bonding electrons in a covalent bond
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permanant dipole
a small charge difference across a bond that results from a difference in the electronegativity of the bonded atoms
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permenent dipole-dipole forces
is a weak attractive force between permenent dipoles in neigbouring polar molecules
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van der waals forces
are attractive forces between induced dipoles in neighbouring molecules
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hydrogen bonding
is a strong dipole-dipole attraction between: >an electron deficent hydrogen atom on one molecule and a lone pair of electrons on a highly electronegative atom on a different molecule
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ice is less dense than water
because ice has a an open lattice with hydrogen bonds holding the water molecules apart. so when ice melts, the rigid hydrogen bonds collapse, allowing the H20 molecules to get together
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high freezing,M.P and B.P
the hydrogen bonds are extra forces over and above van der waals forces, > these extra forces have to be overcome in order to melt or boil water. this results in h20 having higher melting and boiling point rather than expected
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metallic bonding
is the electrostatic attraction between positive metal ions and delocalised electrons
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giant metallic lattice
a 3d structure of positive ions and delocalised electrons bonded together by strpong metallic bonds
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periodicity
is a regular periodic variation of properties of elements with atomic number and position in the periodic table
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disproportionation
is a reaction in which the same element is both reduced and oxidized
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Other cards in this set

Card 2

Front

is a region within an atom that can hold up two electrons,with oppsite spins

Back

atomic orbital

Card 3

Front

electrostatic attraction between two oppositely charged ions

Back

Preview of the back of card 3

Card 4

Front

is a bond formed by a shared pair of electrons

Back

Preview of the back of card 4

Card 5

Front

is a shaped pair of electron which has been provided by one of the bonding atoms only

Back

Preview of the back of card 5
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