Chemistry Definitions

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Unit Cell
The smallest repeating unit that shows the full symmetry of structure
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Translational symmetry
Translational symmetry operations leave no point unchanged, with the consequence that crystal symmetry is described in terms of space groups rather than point groups.
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lattice
identical points in space related by translation (no reference to atom or molecules)
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Structure
the arrangement of atoms, ions or molecules in a material in terms of atoms + lattice (we associate atoms with a lattice to generate a structure)
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Lattice Enthalpy
∆HL is the standard molar enthalpy change accompanying the formation of a gas of ions (at infinite separation) from the solid
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What is the ____ of Hydrogen? a) boiling point b) melting point c)density d)bond energy e)bond length
a) 20K b) 14K c)0.08gdm-3 4)436kJmol-1 5)0.74A
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What are p-block elements
- elements which have their outer shell electrons (valence electrons) in a p-orbital. Includes elements in periods 13-18. It is the only block to contain non-metals.
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How are alloys prepared?
By mixing molten components and cooling mixture
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What are subsitutional alloys?
Atoms of ore metal distributed randomly among atoms of other (in solid solutions). (atoms of solute randomly replace that of parent pure metal)
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What are intermetallic alloys?
Atoms with a definite composition and internal structure
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Card 2

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Translational symmetry

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Translational symmetry operations leave no point unchanged, with the consequence that crystal symmetry is described in terms of space groups rather than point groups.

Card 3

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lattice

Back

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Card 4

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Structure

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Card 5

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Lattice Enthalpy

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