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C9 and C10 - Final Mocks - Coggle Diagram
C9 and C10 - Final Mocks
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L2 - Fossil Fuels
Natural gas is largely methane, it is mainly found near oil deposits as it is formed from plankton.
Coal is formed from the remains of fern and trees that die in wet marshlands. Here they do not decompose and are covered with sedimentary rock under great temperatures and pressures.
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L1 - Using Resources
Sustainable: The state of being able to meet out needs without preventing future generations from meeting theirs.
L2 - Potable Water
Drinking water has to have sufficiently low levels of dissolved salts and it cannot have high levels of microbes such as bacteria.
In the UK, rainwater provides most of our potable water because it contains low levels of dissolved salts. This water collects in aquifers, rivers, lakes and reservoirs. This water is:
- Passed through water beds to remove matter such as leaves or suspended particles.
- Sterilised to kill any microbes. We use chlorine for this in the UK.
Sea water has very high levels of dissolved substances so this water is made potable through desalination. This:
- Reduces the levels of dissolved minerals.
- This may be done through distillation or reverse osmosis.
- Both processes require large amounts of energy which makes them very expensive.
L3 - Water Practical
To test for purity:
- Check pH using a pH probe or universal indicator paper.
- Place an empty evaporating basin on an electronic balance, record this mass.
- Fill the evaporating basin with the water sample and place it on a tripod and gauze above a Bunsen burner.
- Gently heat the water to allow it to cool.
- Weigh the evaporating basin again, if its mass has increased then the water contained dissolved mineral ions.
- The water may still contain dissolved gasses.
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