Wednesday, 5 February 2014

New Water Investigations!

Agenda for Today:

Groundwater
I believe everyone should appreciate the infrastructure that brings us freshwater.
Feb 3rd & Feb 4th - Lesson 5
  1. Scribe Role
Everyone needs to go at least twice.
After scribe posts, we are going to start Wonder Questions.
  1. Groundwater
  1. Study for your test
  2. Science Fair:
    1. Feb 13/14th: Design deadline
    2. Feb 17/18th: Data collection deadline
    3. Feb 19/20: Data processing, conclusion and evaluation deadline
    4. Feb 21/24: Presentation materials deadline
    5. Feb 25/26: Refinement and ready for presenting
  1. How do I make a research question from a topic that interests me?
You only require a partner if you have a difficult investigation or you are collecting lots of data.
Content: Students will
  • Identify the properties of water that make it an essential component of the Earth system (e.g., its ability to act as a solvent, its ability to remain as a liquid at most Earth temperatures) .
Skills:
  • Study Skills:
    • To use question and answers to prepare for a test








1) Demonstration - How much salt can hot and cool water dissolve?




Today we investigated about the difference in the amount of salt that dissolves in hot and cool water.




































































First, we prepared two beakers of water with cold and hot water.








































Next, we put the same amount of salt to both beakers.




































The cold water couldn't dissolve a lot of salt.




































But hot water could dissolve most of the salt.


Conclusion: Hot water dissolves more salt than cold water.
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Solvent & Solute


Keywords:

solute: the thing that dissolves in a solvent.  For example, salt can be a solute.
solvent: the fluid that dissolves things.  Water is a solvent.  


Many things can dissolve in solvent:

  • salt (NaCl) and other salts (CaCO3)
  • alcohol
  • acids
  • bases
  • metals
  • and even gases such as CO2 and natural gas can dissolve in water

























A picture showing that metal (copper from the stapel) 

can dissolve in water.




A World Issue: Fracking

In the U.S and Europe, a new technology called fracking is being used to extract natural gas from the ground. However, during this process, the flammable gases dissolved in the water and many regions reported that the tap water of their houses became flammable.










2) Groundwater


Our task was to : Explain possible problems with the proposed well location.  





Keywords:

  • well: hole in the ground where we get water from
  • landfill: an area where garbage is put and then dirt is put over the garbage
  • septic field: an area where human waste is put; usually it’s underground
  • impermeable: things can not pass through it.  
  • aquifer: where water is underground




The possible problems are:


  1. Pollution from the highway - such as oil and exhaust that stuck to the road - could get in the aquifer
  2. Pollution from the septic field could seep into the aquifer.  There are many diseases in human waste which could be spread through the water.  
  3. The ocean water could make the aquifer salty.  Then, we wouldn’t be able to drink the aquifer water.  
  4. Pollution from the landfill - such as acids and heavy metals - could go to the aquifer from runoff.  






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