Chemistry Practice Set 3

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Tengo una novela. Es mi favorito libro porque es muy intersante y comico. Esta escrito por Libba Bray. Su nombre es The Creat and Terrible BEauty. Es importante para mi porque mi padre compro para mi deciseis cumpleanos. Lo compro en Chapters. El sabe que me gusta los libros mucho! Alguna preguntas? 

Bio Lab ATTN: JINA AND CHRISTINA. please edit in comment box. I'll add it to the master.

Hypothesis

A person who does a series of physical activities will exhale more carbon dioxide compared to when they do limited physical activities.

Materials

• Bromothymol blue
• Water
• Sodium hydroxide solution
•  Plastic straw
•  Stirring stick
•  Beaker
•  White paper
•  Erlenmeyer flask
• 1 small Beaker  and 1 large beaker

Procedure

1.         Fill large beaker with 200ml of water.

2.         Add 20 drops of bromothymol blue to water.

3.         Stir the solution.

4.         Pour 75ml of the solution into the small beaker as the control.

5.         Pour 75ml of the solution into the Erlenmeyer flask.

6.         The relaxed person, who has not yet done a series of physical activity yet,blows with a plastic straw into the Erlenmeyer flask with solution for 10 seconds.

7.         Take sodium hydroxide and drop it into the CO₂ solution. Mix between every one drop until the orginal colour of the control is achieved. Record the number of drops. 

8.         The same person will run for 2 minutes and repeat step 6-7

9.        Another two to three people will repeat steps 6-8.
10.      Go through steps 1-9  for a second trial.

Data

Trial 1.

Participants	Drops of NaOH added to solution before running.	Drops of  NaOH added to solution after running.
Christina	2	5
Josephine	6	8
Average	4	6.5

Trial 2.

Participants	Drops of NaOH added to solution before running.	Drops of  NaOH added to solution after running.
Christina	3	7
Josephine	6	9
Average	4.5	8

OVERALL AVERAGE before running: 4.25 drops


OVERALL AVERAGE after running: 7.25 drops

Result

            The average amount of CO₂  exhaled by a normal relaxed person is equivalent to 4.25 drops of NaOH. 

            The average amount of CO₂  exhaled by a physically engaged person is equivalent to 7.25 drops of NaOH.

Conclusion

            An average person who is engaged in physical activity will exhale more carbon dioxide in comparison to an average person who is not physically engaged. There is an average difference of three NaOH drops between the initial results before running and final results after running.

            Possible errors on the experiment include: some people may perform more physical activities that increases the exhalation of CO₂, thus the amount of CO₂ may vary within each person. For example, some people who play an instrument may have bigger lung capacity which allows them to exhale more CO2.  Also, the control group was in a different type of container compared to the other tested variables thus variations of the colour may occur creating possible incorrect data to follow. 
            Future experiments may include how much O₂ a typical physical active person may inhale compared to a not physical active person. Also further studies could be done upon how temperature may effect the amount of CO₂ a typical human can exhale.