The Solid State Flashcards
Classifying materials into categories of either a solid or a liquid is primarily on response to….
Stress
For a material to be classified as a solid it must…
withstand indefinitely the stress imposed by its own weight.
under it’s own weight liquid will…
Shear instantaneously.
What exhibits a purely plastic response and will shear instantaneously under it’s own weight…
Liquid
A material that will withstand the stress imposed by it’s own weight is a
Solid.
Many materials response to stress is…
Time dependent.
Which state would you find crystalline or amorphous forms
Solid State.
In the solid state you’re more likely to see forms of
Crystalline or amorphous.
Crystalline solids form most readily where the bond is…
non directional.
Non directional bonding forms…
crystalline solids
Rapid cooling from the liquid state prevents he formation of
crystalline arrays
preventing crystalline arrays is a result of…
rapid cooling from the liquid state.
When the structure of amorphous materials cannot be distinguished easily from from that of corresponding liquid. The solids are referred to as…
Glasses.
Crystallites that are in continuous movement with atoms at the boundaries being lost or gained from other crytallites best describes
liquids
A non-crystalline substance consisting of large molecules or ultramicroscopic particles of one substance dispersed through a second substance is referred to as….
colloids
What are examples of colloids
gels, sols, and emulsions
What is thixotropy?
when a gel / colloid is still the material is solid, but when vigorous stirring occurs the gel reliquifys. When stirring stops, the material solidifes.
As the metallic bond is non directional and non specific, the metallic ions…
Pack together as closely as possible.
when a gel / colloid is still the material is solid, but when vigorous stirring occurs the gel reliquifys. When stirring stops, the material solidifes. is known as
thixotropy.
The metallic crystal can be described as…
a collection of hard, in compressible spheres packed together in a electron gas.
a collection of hard, in compressible spheres packed together in a electron gas best describes
The metallic crystal.
How many closest neighbours can each ion have on a closely packed plane of metallic ions?
6
How many closest neighbours can each ion have on a closely packed plane of metallic ions in a third dimensional setting.
12
Closest packed planes of metallic ions can have a stacking sequence of…
ABAB or ABCABC
What stacking arrangement in metallic ions is called the close packed hexagonal structure.
ABAB.
What are examples of metal which adopt the ABAB, closely packed hexagonal structure…
magnesium & zinc
What stacking arrangement in metallic ions is called the face centred cubic structure.
ABCABC
ABAB is the stacking arrangement in metallic ions for
close packed hexagonal structure
ABCABC is the stacking arrangement in metallic ions for
face centred cubic structure.
what are examples of metals which adopt the face centred cubic structure with regards to stacking metallic ions
Aluminium, copper, iron, gold
How many closest neighbours can each metallic ion have on a body centred cubic structure
8
The occurrence of more than one solid form. e.g body centred cubic structure and face centred cubic structure is called…
Allotropy
What is Allotropy
The occurrence of more than one solid form. e.g body centred cubic structure and face centred cubic structure
What metal can exist in two solid forms
Iron.
