Qualification > Sciences
Physics Syllabus Question- Phases of Matter
$!$RatJumper$!$:
In the physics CIE syllabus for A levels, it says under Phases of Matter:
"distinguish between the structure of crystalline and non-crystalline solids with particular reference to metals, polymers and amorphous materials."
What do we need to know in specific for that? I don't have any notes on this so am pretty lost.
Thankx
Deadly_king:
--- Quote from: $!$RatJumper$!$ on November 10, 2010, 07:13:29 pm ---In the physics CIE syllabus for A levels, it says under Phases of Matter:
"distinguish between the structure of crystalline and non-crystalline solids with particular reference to metals, polymers and amorphous materials."
What do we need to know in specific for that? I don't have any notes on this so am pretty lost.
Thankx
--- End quote ---
Hmm........there are not much notes on that. It also enters the part of elasticity. Anyway here are my notes on the particular subject and which you need to know. ;)
Crystalline solids
Pure metals are generally crystalline in structure. The atoms are arranged in a regular manner forming a three-dimensional lattice structure. With such ordered packing system, the largest number of atoms can be arranged within the smallest possible volume. The potential energy of the system tends to a minimum for stability.
Crystalline solids have a very high Young's Modulus. They elongate and undergo plastic deformation under action of large forces.
Example : Copper.
Amorphous solids
These are solids obtained when a molten material is rapidly solidified and such that the disordered liquid structure is retained, However, in an amorphous solid, we have short-range ordering.
Amorphous solid have a very high Young's Modulus and generally they obey Hooke's law upto the breaking point.
Example : glass.
Polymers
They consist of long chains of carbon atoms bonded to hydrogen or other atoms.
They have a very low Young's Modulus and they tolerate large strains while exhibiting elastic behaviour.
Example : Rubber
The second paragraph in the 3 descriptions are most important. ;)
Hope it helps :)
$!$RatJumper$!$:
--- Quote from: Deadly_king on November 11, 2010, 04:53:53 am ---Hmm........there are not much notes on that. It also enters the part of elasticity. Anyway here are my notes on the particular subject and which you need to know. ;)
Crystalline solids
Pure metals are generally crystalline in structure. The atoms are arranged in a regular manner forming a three-dimensional lattice structure. With such ordered packing system, the largest number of atoms can be arranged within the smallest possible volume. The potential energy of the system tends to a minimum for stability.
Crystalline solids have a very high Young's Modulus. They elongate and undergo plastic deformation under action of large forces.
Example : Copper.
Amorphous solids
These are solids obtained when a molten material is rapidly solidified and such that the disordered liquid structure is retained, However, in an amorphous solid, we have short-range ordering.
Amorphous solid have a very high Young's Modulus and generally they obey Hooke's law upto the breaking point.
Example : glass.
Polymers
They consist of long chains of carbon atoms bonded to hydrogen or other atoms.
They have a very low Young's Modulus and they tolerate large strains while exhibiting elastic behaviour.
Example : Rubber
The second paragraph in the 3 descriptions are most important. ;)
Hope it helps :)
--- End quote ---
Thank you so much! :)
Deadly_king:
--- Quote from: $!$RatJumper$!$ on November 11, 2010, 05:11:30 am ---Thank you so much! :)
--- End quote ---
Anytime dude :)
Dania:
Can you give me the right definitions of "SPONTANEOUS" and "RANDOM" in context to radioactive decay?
Navigation
[0] Message Index
[#] Next page
Go to full version