Aquatic Environments Investigation 4 by qingyunliuliu

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									Aquatic Environments
   Investigation 4



                   R. Beck
                   Housman
                   Elementary
Purpose:
• Observe an aquarium environment over time
  and keep a record of changes in a journal.
• Identify and monitor some of the environmental
  factors in a freshwater environment.
• Relate the observed difference in the acidity of
  aquariums to the amount of carbon dioxide
  produced by the organisms in the aquariums.
• Use scientific thinking processes to conduct
  investigations and build explanations: observing,
  communicating, comparing, organizing, and
  relating.
Discussion:


Name some aquatic
environments…how are
they different from each
other and from terrestrial
environments?
    Aquarium

An aquatic environment;
a tank for keeping live
 water plants and
 animals
Record observations:
   Date and time of Observation
Aged or conditioned tap water
Light and heat
Aquarium walls
Gases and other materials in
the water
Other beta
What environmental
factor is missing
from the beta
environment?
Group members will share
responsibility of caring for
the aquarium: daily feeding,
checking the temperature,
and monitoring the water
conditions.
Aquarium: a tank for
keeping live water
plants and animals.
     Content/Inquiry
What are two important
environmental factors to
consider when setting up
a beta aquarium?
            Demonstrating BTB
BTB is a chemical used to test water.


 Let’s find out what happens
  when a few drops of BTB
      are added to aged
   (conditioned) tap water.
Put one 5-ml spoon of aged or
treated tap water in a clean
vial. Add 2 drops of BTB, put
the cap on, and swirl to mix.
           Observe.
Vinegar is an acid:
let’s find out what
happens when some
acid is added to
our water with BTB:
      Introducing the Concept
             of Indicator
It is important to know the
amount of acid in the aquarium
water because too much acid
will hurt the fish and other living
organisms.
BTB color    Acidity
  Blue       None
 Green         little

 Yellow     significant
  Three different water samples
• Measure 5ml of the appropriate
  water into each vile.
• Put 2 drops of BTB in each vile.
• Cap and swirl vials.
Each group will get a straw.

One person- blow gently into
your cup containing 100 ml
of tap water and 6 drops of
BTB.

What happens?
    Carbon Dioxide and Acid
• Both fish and humans exhale
   a gas called carbon dioxide
  (CO2).
The carbon dioxide combines
  with water to form carbonic
  acid.
• Indicator- a chemical
  used to test the
  presence, absence,
  or amount of substance
  in a materials
•Carbon dioxide-
colorless, odorless gas,
present in the
atmosphere…It is
released by animals and
plants during respiration
      Part 3 New Organisms
• What could we do to the beta aquarium
  to make it more diverse and interesting?


     Enrich the Aquatic
       Environment
    Make Journal Entries

								
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