Chemistry #2

  • Created by: Bunter
  • Created on: 17-05-13 11:43
If a substance has a low melting/boiling point what does this mean?
That the substance is made up of simple molecules that are liquids or gases at room temperature
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What are intermolecule forces?
The attraction between the individual molecules in a covalently bonded substance
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Why can't simple molecules conduct electricity?
There os no overall charge in simple molecules in a compound, so their molecules cannot conduct electricity
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What are giant covalent structures?
A huge 3-D network of covalently bonded atoms
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What is a Macromolecule?
Giant covalent structure
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What structure can simple molecules form?
Giant Covalent Structure amd Macromolecules
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What special properties do strong covalent bonds give giant structures?
High melting/boiling points, insoluble in water and are very hard
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What is the structure of Graphite?
Carbon atoms are only bonded to three other carbon atoms. They form hexagons which are arranged in giant layers. There are no cavalent bonds between layers, so the layers can slide over each other easily
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Bonding in graphite, what does it involve?
Relatively weak intermolecule forces between the layers in graphite,so they can slide over each other.The carbon atoms in graphite layer are arranged in hexagons. It uses delocalised electrons to side over the carbon atoms.
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What are Fullerenes?
Form of the element carbon that can form s large cage like structure, based on hexagonal rings of carbon atoms
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Why can we bend metals into different shapes?
They layers of atoms in a pure metal are able to slide easily over each other
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What is the structure of a pure metal?
The atoms in a pure are held together in giant metallic structures. The atoms are arranged in closely -packed layers. Because of this regular arrangment, the atoms can slide over one another easily. This is why pure iron is soft can easily shape.
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What are alloys?
They are usually mixtures of metals, due to this they have a mixture of different sized atoms, this makes it difficult for the layers in the giant metallic structures. Making alloys hard.
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Explaining the properties of metals
+ ions in metal giant structure are held togther by delocalised electron.Their + & - ions hold ions in position.Electrons can move throughout the lattice
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Other cards in this set

Card 2

Front

What are intermolecule forces?

Back

The attraction between the individual molecules in a covalently bonded substance

Card 3

Front

Why can't simple molecules conduct electricity?

Back

Preview of the front of card 3

Card 4

Front

What are giant covalent structures?

Back

Preview of the front of card 4

Card 5

Front

What is a Macromolecule?

Back

Preview of the front of card 5
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