1. Develop Skills Measuring Chemicals with a Graduated Cylinder

Name ______Date ______Period______

Rainbow Lab

Objectives: 1 1. Develop skills measuring chemicals with a graduated cylinder. 2 2. Practice using the metric system. 3 3. Test precision and ability to follow directions. 4 4. Practice lab safety procedures.

Materials: 6 Test tubes labeled A, B, C, D, E, F Test tube rack Graduated cylinder 2 beakers Beaker with red liquid Beaker with yellow liquid Beaker with blue liquid Goggles Paper towels

Procedure:

Part 1: Before you begin, put your goggles on and do not remove them until you walk out the classroom.

1 1. Label 6 test tubes in order: A, B, C, D, E & F. 2 2. Fill a beaker half full with water. Use this to rinse your graduated cylinder and test tubes. 3 3. The second beaker is for waste water. 4 4. Measure 21 mL of RED liquid using the graduated cylinder and pour into test tube A. 5 5. Rinse the graduated cylinder with your water and pour the waste into your waste beaker. 6 6. Measure 17 mL of YELLOW liquid and pour into test tube C. 7 7. Measure 21 mL of BLUE liquid and pour into test tube E.

Part 2: Rinse the graduated cylinder with clean water between each measurement.

1 1. From test tube C, measure 4 mL and pour into test tube D. 2 2. From test tube E, measure 7 mL and pour into test tube D. Swirl. 3 3. From test tube E, measure 4 mL and pour into test tube F. Name ______Date ______Period______

4 4. From test tube A, measure 7 mL and pour into test tube F. Swirl. 5 5. From test tube A, measure 8 mL and pour into test tube B. 6 6. From test tube C, measure 3 mL and pour into test tube B. Swirl. 7 7. Measure the contents of each test tube and record how many mL are in each test tube in your data table. Also, record the color in each test tube. 8 8. Create a bar graph of your results. Use color for each respective test tube. Table 1: Test Tube Results Test Tube Color of Liquid Amount of Liquid (mL) A B C D E F Name ______Date ______Period______

Analysis/Results:

1 1. Name the colors that you created.

______2 3 2. How many mL of liquid were in each test tube at the start of this lab? ______Name ______Date ______Period______

4 3. Why is it important to follow directions exactly? ______5 6 4. What would have happened if your measurements were not correct? ______

7 5. Look at your hands. Do you have any stains on your hands? How about your lab sheet? What are the implications if those stains represent chemicals that would be on your skin right now? ______1

8 6. How many TOTAL mL of liquid did you have at the end of the lab? ______mL

How many should you have? ______mL

1 7. What are some reasons why you may have more or less than when you started? ______Name ______Date ______Period______

Conclusion: In a paragraph, explain the purpose of the lab, what you did, and what your results were. ______

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