Karteikarten
special materials
Karten in diesem Stapel (28)
- 1what is grapheneit is a form of carbon...it is a single layer of graphite
- 2how is graphene arrangedin a hexagonal structure,just one atom thick
- 3what are the properties of graphene and why do they make it usefulit is very strong and a good thermal and electrical conductor and nearly transparent...these properties make graphene useful in electronics and composite materials
- 4what do carbons also formthey form molecules known as fullerines which contain different numbers of carbon atoms
- 5what is the structure of fullerinesthe structure of fullerenes is based on hexagonal rings of carbon atoms. Sometimes these rings contain 5 or 7 carbon atoms. They have hollow shapes, including tubes , balls and cages
- 6what was the first fullerene to be discovered and what are its properties
- 7what are carbon nano tubesthey are cylindrical fullerenes with very high length to diameter ratios
- 8what are carbon nano tubes useful forthere properties make them very useful for use in nano technology, electronics and materials
- 9what can fullerenes be used for in every day life-to deliver drugs in the body
-in lubricants
-as catalyst
-for reinforcing materials e.g the frame of a tennis racket, so the are strong but still lightweight - 10what do polymers consist ofvery large molecules
- 11what are plasticsplastics are synthetic (man made) polymers
- 12how are the atoms in polymers held together and what are the inter molecular forces like-they are held together by strong covalent bonds
-the inter molecular forces between the large molecules are quite strong - 13how is poly(ethane)/polythene producedits produced when lots of ethane molecules are joined together in an addition polymerisation reaction
- 14whats good about polythene and what is it used forits cheap and strong and is used to make plastic bottles and bags
- 15what is the diameter of -coarse particles -fine particles -nano particles
- 16what is 1 nano meter equal to
- 17what is nano sciencethe study of very small structures
- 18do small particles have a high or low surface area to volume ratiohigh
- 19changing the particle size has a massive effect on the ratio what would happen if the length of the side of a cube decereases by a factor of 10
- 20why is this important for catalystsas having a large surface area improves the effectiveness
- 21how many atoms do nano particles containonly a few hundred atoms
- 22what do nano particles combine to formnano structures
- 23why are nano structures goodthey can be manipulated so materials can be developed that have new and specific properties
- 24what are the properties of nano particles different tothe properties of the same materials in bulk e.g they are more sensitive to light, heat and magnetism
- 25what makes nano particles so good (clue-atoms)the atoms can be placed into exactly the right position so smaller quantities are needed to achieve the required properties
- 26what are nano particles used in and whysun creams- because they provide better skin coverage and therefore more effective protection from the suns harmful ultraviolet rays
- 27what are the worries with nano particlesnano particle are so small they could get into and damage human cells or cause problems in the environment
- 28what is research into nano particles leading into the development of
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- Beschreibung
- GCSE chemistry new Karteikarten am special materials , erstellt von ella stokes am 22/11/2017.
- Erstellt von
- ella stokes
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