C2, Structure, properties and uses

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  • Created by: emmajane_
  • Created on: 04-03-14 18:25
SIMPLE MOLECULAR- What are the molecules held together by?
Strong covalent bonds
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SIMPLE MOLECULAR- Why do they have a low boiling and melting point and do not conduct electricity?
Because they are joined by weak forces
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GIANT COVALENT- Why do they form a giant lattice
Becausase they held my many covalent bonds
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GIANT COVALENT- What are special about diamond and graphite?
They have different properties
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What is a macromolecule- name 3 examples
A giant covalent structure and graphite, diamond and silica
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GRAPHITE- Why does graphite conduct electricity?
Because it has free ions called delocalised electrons
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GRAPHITE- How many atoms are the molecules joind by?
3
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GRAPHITE- why can the layers slide over eachother?
Because there are no covalent bonds and there is only an intermolecular force between them
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GRAPHITE- What are the layers made of?
Carbon atoms
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DIAMOND- what is diamond made of?
Carbon atoms
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DAIMOND- what is the structure like?
A giant covalent structure
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DIAMOND- Does diamond conduct electricity?
No
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SILICA- what is silica made of?
Silicone and oxygen
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SILICA- what is the structure similar to?
The diamond structure
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POLYMERS, THERMOSOFTENING- Why does i soften when heated and harden when cooled?
Because of tangled polymer chains uncoil and slide past eachother. This makes it flexible
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POLYMERS, THERMOSETTING- How are the chains joined?
By cross-links. They don't easily slide
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POLYMERS, THERMOSETTING- What is thermosetting used for?
The rubber for tyres
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POLYMERS, THERMOSETTING- what happens once it's moulded?
It doesn't soften again
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IONIC COMPOUNDS- Why can't ionic compounds conduct electricity?
Because ions can't move around the lattice
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METALS- Why are metals malleable
Because the layers of atoms can slide over eachother when mettal is bent or hammered
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METALS- In giant structures, what can the electrons on the outer shell free to do?
Move around
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METALS- Why do metals have a high melting point?
Because metallic bonds are strong, so metals can maintain their structure
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METALS- Why are metals good conductors?
Because electrons can move around their outer shell
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ALLOYS- What is an alloy?
A mixture of two or more elements, where at least one element is a metal
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ALLOYS- Why are alloyed metals very strong
Becausase they are all different sizes and have a distorted structure, amking it hard for them to slide over eachother
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NANOPARTICLES- What is the size range of nanoparticles?
100nm-1nm
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NANOPARTICLES- Why can nanoparticles react quickly, making them useful catalysts?
Becaue they have a large surface area compared to volume
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NANOPARTICLES- What can nanoparticles be used for?
Sun screen, to stop harmful ultra violet light without appearing white on the skin
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GRAPHITE- Why are the layers weak and slippery?
Becauae there is only intermolecular forces between the layers
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Other cards in this set

Card 2

Front

SIMPLE MOLECULAR- Why do they have a low boiling and melting point and do not conduct electricity?

Back

Because they are joined by weak forces

Card 3

Front

GIANT COVALENT- Why do they form a giant lattice

Back

Preview of the front of card 3

Card 4

Front

GIANT COVALENT- What are special about diamond and graphite?

Back

Preview of the front of card 4

Card 5

Front

What is a macromolecule- name 3 examples

Back

Preview of the front of card 5
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