SOLID AND LIQUID GOLD

Last Update 27/ 01/ 2002

in English/ in Esperanto/ in French/ in Portuguese

Objective

Aid the understanding of the dynamic equilibrium, by means of a simple artistic model of chemistry employing a program of graphical animation where the number of atoms in the solid state does not change but many morphological dispositions are possible. Three different arranges appear randomly.

Introduction

The animation shows a hypothetical situation of a small portion of 31 atoms of solid gold circled by 40 atoms of liquid gold in two dimensions. Each yellow disc represents a gold atom. The discs in movement represent a layer of pairs of atoms in the liquid state in ordered vibration, whose order is suggested by the fact of being too close to the crystal of gold. The stationary discs represent the atoms of gold of the face with Miller indices (1 0 0) of the crystal in dynamic equilibrium with the liquid at melting temperature (1064.18o C). The liquid material further from the crystal was not represented, but it will vibrate randomly, with no particular order. The vibration of the atoms in solid crystal was not represented, because its intensity is much smaller than the liquid.

The disposition of the atoms of gold in the solid crystal (in dynamic equilibrium with the liquid) is identical to a set of adjacent faces (1 0 0) of the gold unit cell, as represented by this application.

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Table of subjects.
Presentation
Chemistry Analytical Chromatography
Elemental organic analysis
Volumetric analysis, simulation
Crystallography 3 fold screw axis
4 fold inversion axis on tetrahedron
5 fold rotation axis absent in crystallography
Binary axis and reflection plane in stereographic projection
Bravais lattices
Conic sections under symmetry operators
Converting from spherical coordinates to stereographic projection
Crystal lattice and unit cell
Determination of unit cell
Elements of symmetry in action - animation
Elements of symmetry in action - cube game
Elements of symmetry in action - dodecahedron game
Elements of symmetry in action - icosahedron game
Elements of symmetry in action - octahedron game
Elements of symmetry in action - tetrahedron game
Ewald sphere and crystal measurements
Extinctions
Five classes in the cubic system
Five classes in the rhombohedral system
From tetrahedron to prism
Gnomonic projection
Improper symmetry axis
Miller indices
Miller indices - animation
Miller indices - cube game
Miller indices - octahedron game
Miller indices - rhombic dodecahedron game
Miller indices - tetrahedron game
Mirror plane
Mirror planes and Miller indices game - tetrahedron
Orientations of the cube
p2mm
Plane symmetry groups
Question on point group
Rotation axis in octahedron and Werner compounds
Rotation axis on tetrahedron and organic molecules
Rotation of objects about an arbitrary axis
Rotation of the parallel and stereographic projections of the cube
Rotation of the stereographic and parallel projection of the cube III
Seven faces in stereographic projection
Seven classes in the hexagonal system
Seven classes in the tetragonal system
Six elements of symmetry in seven orientations
Spherical projection of the octahedron
Stereographic projection
Stereographic projection of six polyhedra in different orientations
Straight line equations and symmetry elements
Symmetry, 2 fold axis
Symmetry, 2, 3 and 6 fold axis in benzene
Symmetry, 3 fold axis in the cube
Symmetry, 4 fold axis in the cube
Symmetry, 4 fold axis in the unit cell of gold
Symmetry elements and Miller indices game
Symmetry elements and Miller indices game - octahedron
Symmetry in art and in crystallography
Three classes in the monoclinic system
Three classes in the orthorhombic system
Twin crystals
Two classes in the triclinic system
Unit cell in hexagonal net
General Butane conformations
Density
Electrochemical cell
Ethane conformations
Oxidation and reduction
Resources of chemical-ICT: water, health and symmetry
Solid and liquid gold