C12 - Earths recources...

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C12 - Earths recources...

C12 - Earth's recources...

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Finite and renewable sources

Finite : Limited amount

Renewable: Reusable source 

Finite: Copper, oil,  Nuclear fuels, Metals, coal

Renwable: wood, solar panels, Cotton, leather, ethanol

Natural Recource: recources that arn't man made

Wool - Clothes, carpets

Cotton - clothes, textiles

Wood - Construction

Rubber - tyres

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Alternative sources...

  • Chemists must make alternitave products in case of a disease/ natural hazard that wipes it outnfor sustainable development. 
  • Sustainable development = recources that are able to saty around for a long period of time, without limiting the people who live now.
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Order of magnitude...

Image result for order of magnitude table gcse (http://slideplayer.com/6979874/24/images/5/Orders+of+Magnitude+Powers+of+Ten.jpg)

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Order of magnitude...

Big number / small number =

If answer is: 

less than 10 - same order of magnitude 

approx 10 - 1 order of magintude bigger

approx 100 - 2 orders of magnitude bigger

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Safe water to drink...

Potable water - drinkable water that is pure

In UK we collect rain and fresh water from rivers and resovouirs. 

Most potable water produced by: 

Appropriate fresh water source

Passing through water filter beds

sterilizing

Sterilizing agents: Chlorine, UV light

Distilalation uses large energy amounts.

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Making drinking water...

  • Water is purified by filtration, sedimentation and the addition of chlorine (http://www.bbc.co.uk/staticarchive/94d46caf831f9308131b7550dff05fa83af387fb.gif)
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Waste water...

  • Water that has been treated before, used in homes and flushed out again, e.g shower or toilet water.
  • Important to treat waste water before letting it back into the environment to prevent bacteria and disease spread.
  • Process involves: 
  • Screening - Removes large objects
  • Primary treatment - Solids settle and push sludge to back. Watery liquid is pumped into next tank. 
  • Secondary treatment - Bacteria breaks down organic matter. 
  • Final treatment- useful bacteria can settle and sediment goes to sludge tank. Rest of water goes to rivers.
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Extracting metals from ores...

  • Use copper for wiring, coins, pipes. It also conductes electricity. 
  • Copper is extracted from adding sulferic acid to produce copper sulfate before the copper metal is extracted and smelting using electrolysis.
  • Using bacteria to extract copper is less wasteful
  • Copper can be found native as it's not very reactive. 
  • Collectes at positive electrode, it can be oxidised. 

Cu (s) + CuSO (aq)

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Life Cycle assesments...

1) Raw materials: 

Renewable? Where found? How far? 

2) Manufacture: 

What procceses? Cost? Much Co2 created? Energy and water?

3) Distrubution: 

How far? Environmental impact? Cost? Energy? 

4) Product use: 

Environmental impact? How long can it last? Resuable?

5) Disposal of product:

Changed into something else? Recycled? Biodegradable? Landfill? Space needed?

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