GCSE AQA Chemistry 2

GCSE AQA Chemistry 2

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  • Created by: nellie
  • Created on: 30-12-10 14:51

What is Nanotechnology and it's uses?

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Nano structure and thier very small sizes gives them new properties.

Large surface areas, exposing many atoms at thier surface.

Electrons can move through them easily.

used to make new drugs, sensors, catalysts.

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What is percentage Yield?

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Percentage Yield = Amount of product collected/ Maximum amount of product

                              possible

                             then times the answer by 100 to make it a percentage

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Talk about metallic Bonds........

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Held together by delocalised electrons which circles the metal ions

only metal elements can have metallic bonds

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Talk about covalent bonds......

 

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Only between Non-metal.

They share electrons

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How do you work out the number of protons, neutrons and electrons?

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Number of neutrons = Mass number(biggest) - atomic number(Small)

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what are simple molecules......

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Molecules that are held together by strong covalent bonds.

Attraction between molecules are called intermolecular forces.

attraction between simple molecules are weak.

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What are the stages of Harber Process?

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Held together by delocalised electrons which circles the metal ions

only metal elements can have metallic bonds

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how do you work out the atom economy?

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atom economy= relative formula mass of useful products                        

                          Relative formula mass of all products                 

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Talk about ionic bonds.......

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Only between metal and nnon-metal

Electostatic forces attract

the positive will lose electron and the negative will gain electron.

Melted- conduct electricity

water splits the lattice structure

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