Carbon Transfer through Snails and Elodea – Virtual Lab

Name:________________ Carbon Transfer through Snails and Elodea ? Virtual Lab

LAB NOTEBOOK Hypothesis:

Explain how carbon dioxide cycles in aquarium water through snails and Elodea

Dependent variable & Operational definition Determine the operational definition of your dependent variable. How will you measure the dependent variable?

In my experiment I will measure the dependent variable by:

Independent variable and answer it in the box: (Identify your independent variable. (there are several so you have to decide what you want to test.)

Decide which condition you will test: In my experiment, my independent variable will be:

Control Determine your control. A control is a set-up against which the change in the dependent variable can be measure. Describe what is in the test tube used for your control condition. The set-up for my control condition is:

Name:________________

Experimental Design: You have a total of 8 tubes available for your experiment. Each of your test tubes will b filled with BTB solution.

I will use _______ test tubes. At least on of the test tubes will be used for you control condition. The other test tubes will be used for your experimental conditions.

Determine the set-up for each tube and write it in the contents box in the table below:

Data

Test tubes In dark

Contents

Starting color Predicted end End color color

1

2

3

4 Test tubes In light

5

Contents

Starting color Predicted end End color color

6

7

8

Name:________________ 1. Conclude: What was your experimental design? What is the relationship between snails and Elodea? 2. Analyze: Why did the color of the bromthymol blue change?

3. Analyze: What was the importance of a control in your experiment? What would you conclude if the color if the color of the solution in the control changed?

4. Infer: When you began the experiment, was there CO2 in the water? In the test tubes that contained Elodea, where did the CO2 go?

5. Infer: Which gas did the snails release? What observation supports this inference?

6. Apply Based on the results of your experiment, explain why you need to add the Elodea to your snail aquarium.

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