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Science Test Flash Cards
Test
18
Other
8th Grade
10/17/2007

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Cards

Term
Control  
Definition
An example not having to do with what is being tested.  It is called a Healthy Stream.
Term
Base
Definition
A base has a pH higher than 7 in its scale.  It is called Alkaline
Term
Chlorine  
Definition
A chemical used to kill germs.  It is a gaseious corrosive element of the halogen group.  it is used for water purification.
Term
Secchi
Definition
A tool that tells you the visibility of the water.  Sink it in a container of water, and when it gets to the bottom you look at it and if you can see it, then theres no sediment runoff.  If you see it a ittle bit blurry, then there is some sediment, and so on and so forth.
Term
H +
Definition
 means acidic, lower than seven
Term
Food Chain     
Definition
A list of different animals, each one feeds from the one below it.
Term
Turbidity Tube  
Definition
Look at the tube and the placement of the ruler.  Where ever the sticker meets with the ruler number, that is your answer.  you have to answer by saying "The Clarity of the Water is _______"
Term
Daphnia  
Definition
A freshwater flea with a transparent shell and antennae.
Term
Bioindicator
Definition
Animals and plants that are sensitive to change in their environment,  They can show scientists if the environment is alright or not.
Term
pH
Definition
pH is Potential Hydrogen, numbers that are higher than 7 are alkaline and numbers that are lower are acidic.
Term
OH- 
Definition
It is a base, has a pH higher than seven
Term
Buffering  
Definition
When acid rain falls on some kinds of soils, it can be neutralized by certain types of rock, like limestone.  Granite is one that does not neutralize.
Term
Acid
Definition
A corrosive stubstance that has a pH less than 7 and can react with a base to make a salt.
Term
Why use biological and chemical test?  
Definition
So that you can see what is dying, and how they are dying. You need both to figure them out.  You compare each one to eachother to see if there is conflicting data.
Term
How do you know where acid rain is from?  
Definition
If there are "scrubbers" that clean the smoke stacks at the factories, then you would knowo that it comes from cars.
Term
producer
Definition
a photosynthetic organism.  the only organism on earth that can take energy directly from the sun
Term
detritivores
Definition
organisms that eat dead things.  Bacteria, vultures, fungi, termites, blowflies, maggots.
Term
food web
Definition
like a food chain except more than one feeding relationship in its ecosystem.
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