3 fill 250 ml beaker completely with water 4 attach

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3. Fill 250-mL beaker completely with water. 4. Attach the dropper top to one end of the clear tubing. 5. Insert the opposite end of the tubing into the 50-mL graduated cylinder. 6. Place thumb over opening of the 50-mL graduated cylinder and invert into the beaker. See Figure 2 below an illustration.
Figure 2. Assembly of gas collection apparatus 7. Record the initial volume of gas in the graduated cylinder in Data Table 1. If no gas is present, the volume will be 0. 8. Turn on the balance. 9. Place a weigh boat on the balance and tare it. 10. Weigh 0.1 gram of yeast onto the weigh boat. 11. Pour the yeast into the empty 30-mL bottle. 12. Measure 1 mL of hydrogen peroxide in the 10-mL graduated cylinder. Record the exact volume in Data Table 1. 13. Prepare the end of the tubing with the dropper top. 14. Pour the hydrogen peroxide into the 30-mL bottle. 15. Snap the dropper top with tubing onto the bottle. 16. Allow the reaction to proceed until no additional gas has been generated for at least one minute. At this point, the reaction can be considered complete. 17. Record the final volume of gas in Data Table 1.

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