# Water Cyclein Test Tube

Document Sample

```					Biology
Standard 1: Objective 2

Title: Water Cycle in a Test Tube

Activity Description: Students will model the water cycle in a test tube. They will also
learn how water is purified.

Materials needed: ring stands, test tube clamp, 2 large test tubes, stoppers, glass and
vinyl tubing, bucket, alcohol burner, goggles, large beaker

Prior to Assessment: Students should have a basic understanding of the water cycle.

Time Needed: 1 class period

Teacher Procedures:
1. Prepare a mixture of dirty water in a large bucket. Some possible things to add
include, sand, clay, detergent, food particles etc.
2. You may want to make an overhead of the lab set up to help them
3. Supervise as they set up their labs.
4. When you light their burners remind them to heat slowly, if their boil becomes to
large the water will move through their plastic piping instead of evaporating and
then condensing.
5. Make sure that students wear their goggles throughout the lab
6. Monitor students closely

Extension: Use a voltmeter to determine the cleanliness of water. Pure water will not
conduct a current.

Scoring Guide:

Students participated in lab and cleanup: 15 points
Questions were correctly answered: 20 points
Conclusions represent ideas discussed in the Lab: 20 points
Name:____________________________________________ Period:_________

Title: Water Cycle in a Test Tube

Purpose: To model the flow of water through an ecosystem and determine if water
changes as it flows through the system.

Prediction: How will the dirty water change?

Materials: ring stand, clamp, 2 large tt, stoppers, glass and vinyl tubing, bucket,
alcohol burner, goggles, large beaker, dirty water

Procedure:
1 Set up apparatus like the drawing below.
2. Add 30 ml of “dirty” water to the heating tube.
3. Light the burner and heat the test tube.
4. Write down observations as you go.
5. Heat until half the liquid is gone.
6. Look at the cooling tube. Describe the results.

Heating
Tube

Cooling
Tube
Data

minute                                     observations
Start
2
4
6
8
10
12
14

Analysis:
1. What does the water do as it is heated?

2. Where does it go after the heated test tube?

3. What does it do when it hits the cool tube?

4. What part of the water cycle does the heated tube represent?

5. What part is the vinyl tube?

6. What does the cool tube represent?

7. How clean is the water in the cool tube? At what stage in the water cycle is water
purified?

8. What is water vapor?

9. What is the chemical formula for water vapor?

10. When does water vapor turn into water?

Conclusion: In complete sentences please explain 2 major ideas you learned in this
lab.

```
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
 views: 2 posted: 7/27/2012 language: pages: 3
How are you planning on using Docstoc?