Chemistry 3

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  • Created by: Poopy
  • Created on: 01-05-13 16:28
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  • Chemistry 3
    • Salts
      • Uses
        • Food industary
          • Flavor food
        • Source of chemicals
        • Used to treat roads in winter
        • Needs to be in your diet
          • Risks
            • Heart disease
            • High blood pressure
          • FSA
            • limits how much is in food/ advises people
      • Extracting salts
        • mining solid salt
          • Mined salt, then either taken up in solid form or water pumped down and then evaporated off
        • Evapouration
          • Salt solution called brine is used, salt is extracted from the brine solution
        • Environmental
          • pumping water down mines could lead to collapse of buildings
          • Salt can affect plants and animals by drying them up
    • Geological Processes
      • E.g. -mountain building/ erosion/ sediment/ dissolving/ evaporation
        • Sediment can use fossils to track movement of continents
      • Convection currents
        • Plate movement
          • Similar rocks are found in different places of the world
            • The world was once a mega continent
    • Alkalis
      • Neutralising acid
      • chemicals that make/bind dyes to cloth
      • Making soap
      • Making glass
      • Hydroxides and soluble carbonates are alkalis they neutralise acids
      • Early attempts of making alkalis
        • lots of hydrogen chloride gas released
        • Large waste heaps were made
          • Waste heaps decompose to release toxic hydrogen sulfide gas
      • Modern Chlor-Alkali industary
        • Brine is used
          • Electrolysis
        • Environmental impacts are monitored carefully
        • Brine
          • Products from brine
            • Sodium hydroxide
              • used to make soaps detergents paper and textiles
              • Untitled
              • Domestic drain cleaner
              • Corrosive substance
            • Hydrogen
              • Flammable
              • Used in processing hydrocarbon fuels, margarine, ammonia in Harber process
              • Potential clean fuel for the future
            • Chlorine
              • Can be used as a bleach
              • kill bacteria in drinking water
              • Toxic gas
    • Risks of chemicals
      • Stay in the environment for a very long time
      • Can be carried for long distances in the atmosphere polluting more of earth
      • Can accumulate in food chains
    • Life cycle of  a product
      • making the material from raw materials
        • Manufacture
          • Use of product
            • Disposal
      • The travelling with the product
        • Amount of energy used in the four stages and with the transport inbetween

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