Thursday, December 9, 2010

Photosynthesis "Dry Lab"

Materials; 4 Test Tube, Snail, Elodea Plant, a lighted room, Pond water, And a dark room.

Procedure;
Step one, Put 100 mL pond water and 20 props of BTB into a test tube.
Step two, repeat step one for all three remaining test tubes.
Step Three, add a snail to two test tube and add a plant to the remaining two test tubes.
Step Four, Take one test tube with the snail and one test tube with the plant into the dark room and keep the other two in the lighted room.
Step Five, Leave all four Test tube over night.
Step Six, Collect data and write down your observations.
Step Seven, clean up. Pour the pond water down the sink, trash the Elodea plant and flush the snails down the toilet.

2)
     1) Water plus bromothymol blue is blue green Because Oxygen is in the water to make it turn blue green and the Ph is neutral.
     2) Water plus bromothymol blue plus an aquarium snail turns yellow Because Bromothymol blue turns yellow when mixed with carbon dioxide because it makes carbonic acid which turns BTB yellow.
     3) Water plus bromothymol blue plus elodea, an aquarium plant, Is blue green in light Because bromothymol blue turns blue green when mixed with oxygen. Oxygen is what comes out after a plant goes through photosynthesis
     4) Water plus bromothymol blue plus a snail plus elodea is blue-green in light and yellow when left in the dark for three hours Because the snail is putting out carbon dioxide in the dark and the plant can't go through photosynthesis in the dark then in the light the plant can go through photosynthesis to put out carbon dioxide.

3) Questions
    1) What color would it change if you added twice as many snails as you did plants?
    2) What color would it Change if you had twice as many plants as you did snails?
    3)  What would happen if you had an oxygen pump in it?

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