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Will Bromothymol blue turn yellow when I exhale into it with a straw?

Will Bromothymol blue turn yellow when I exhale into it with a straw?. Yes, because carbon dioxide turns it yellow. (Although this is an answer to the question, it is not a well-worded hypothesis.). Will Bromothymol blue turn yellow when I exhale into it with a straw?.

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Will Bromothymol blue turn yellow when I exhale into it with a straw?

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  1. Will Bromothymol blue turn yellow when I exhale into it with a straw? Yes, because carbon dioxide turns it yellow. (Although this is an answer to the question, it is not a well-worded hypothesis.)

  2. Will Bromothymol blue turn yellow when I exhale into it with a straw? • If I blow bubbles into a bromothymol blue solution, then the solution will turn yellow, because I exhale carbon dioxide, and bromothymol blue turns yellow in the presence of carbon dioxide. (This is an example of a well written hypothesis!)

  3. Variables • Independent Variable: - Amount of carbon dioxide in each tube OR - blowing (exhaling) into one tube but not the other. (Either one is an acceptable answer. Simply writing “carbon dioxide” or “exhaling” is not sufficient.)

  4. Variables (continued) * Dependent Variable: - The color of the bromothymolblue (or of the solution) in each tube. (Writing only “color” or “bromothymol blue” is not sufficient…you need to be specific.)

  5. Results • Tube A, after blowing bubbles: Yellow • Tube B: Stays Blue (You don’t blow bubbles into this one!!!)

  6. What is your conclusion? • It turned yellow when I exhaled into it. (Partial credit - What turned yellow? Make sure you turn the question around!!!)- - - - - - - - - - - - - • When I exhaled into a bromothymol blue solution, it turned yellow, indicating that I exhaled carbon dioxide. (Specifically answers the original question!)

  7. Based on what you know about cellular respiration and breathing, explain WHY you got the results you did. “no credit” example: • Cellular respiration is a chemical reaction. When I blew into the tube, cellular respiration happened, which turned the solution yellow. “half credit” example: • When you exhale, carbon dioxide comes out, which turns the bromothymol blue yellow.

  8. Based on what you know about cellular respiration and breathing, explain WHY you got the results you did. • During cellular respiration, my cells combine oxygen and glucose to make energy. When this happens, carbon dioxide is produced as a waste product. When I breathe out, I exhale this carbon dioxide. Since carbon dioxide will turn bromothyol blue yellow, the solution in the test tube turned yellow when I blew into it. (Great Answer!)

  9. Based on what you know about cellular respiration and breathing, explain WHY you got the results you did. • All of the cells in my body use cellular respiration to make energy. One of the waste products of cellular respiration is carbon dioxide. Your body must get rid of this carbon dioxide. Every time you exhale, your body is releasing that carbon dioxide waste. When I blew bubbles into the bromothymol blue, the bromothymol blue turned yellow because of the large amount of carbon dioxide I was releasing into it. (Another Great Answer!)

  10. Why did you need Tube B? • Tube B was the “control.” You needed Tube B to compare the colors of the solutions with and without being exhaled into. (Analogy: comparing a plant with fertilizer to a plant with no fertilizer…)

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