Question
Using a straw to blow into the bromothymol blue solution eventually turns the solution a green color. What gas is being blown into the solution that causes it to turn green?
A. The absence of carbon dioxide
B. The presence of carbon dioxide
What color will the water be if photosynthesis has occurred?
Read the following description of Tube #4:
Tube #4 contains:
bromothymol blue(BTB)
carbon dioxide
not exposed to light
no elodea present
initially yellow-green in color
After 24 hours, Tube #4 is still yellow-green in color. Which of the answer choices below describes why?
A. Tube #4 is still yellow-green in color because it performed photosynthesis
B. Tube #4 is still yellow-green in color because the carbon dioxide was absorbed
C. Tube #4 is still yellow-green in color because carbon dioxide was released
D. Tube #4 is still yellow-green in color because it was unable to perform photosynthesis
Read the following description of Tube #2:
Tube #2 contains:
Bromothymol blue (BTB)
Carbon dioxide
Exposed to light
Elodea present
Initially yellow-green in color
After 24 hours, Tube #2 is now blue in color. in 1-2 sentences explain why.
During preparation, baking soda (NaHCO3) is added to the water to create a solution. Which of the options below is the best reason why baking soda was added?
A.TO ADD CARBON DIOXIDE TO THE SOLUTION THAT THE PLANT NEEDS AS A REACTANT OF PHOTOSYNTHESIS
B. To add oxygen to the solution that the plant needs as a reactant of photosynthesis
C. To keep the elodea plant from decaying
D. To keep the water from changing into another color
During the first portion of the experiment, the lights were turned off and a timer was set for 5 minutes. No bubbles were released during this 5 minutes. Which of the answer choices below is the best reason why.
A. There was no light present for photosynthesis to occur
B. There was no oxygen present for photosynthesis to occur
C. There was no carbon dioxide present for photosynthesis to occur
During the second part of the experiment you can see bubbles begin to appear when they didn't before. Which of the answer choices below is the best reason why?
A. Carbon dioxide
B. Oxygen was present in the water when it wasnt before
C. Light was applied to the scenario so photosynthesis could occur
Add a summarization of all the answers at the end.
A. The absence of carbon dioxide
B. The presence of carbon dioxide
What color will the water be if photosynthesis has occurred?
Read the following description of Tube #4:
Tube #4 contains:
bromothymol blue(BTB)
carbon dioxide
not exposed to light
no elodea present
initially yellow-green in color
After 24 hours, Tube #4 is still yellow-green in color. Which of the answer choices below describes why?
A. Tube #4 is still yellow-green in color because it performed photosynthesis
B. Tube #4 is still yellow-green in color because the carbon dioxide was absorbed
C. Tube #4 is still yellow-green in color because carbon dioxide was released
D. Tube #4 is still yellow-green in color because it was unable to perform photosynthesis
Read the following description of Tube #2:
Tube #2 contains:
Bromothymol blue (BTB)
Carbon dioxide
Exposed to light
Elodea present
Initially yellow-green in color
After 24 hours, Tube #2 is now blue in color. in 1-2 sentences explain why.
During preparation, baking soda (NaHCO3) is added to the water to create a solution. Which of the options below is the best reason why baking soda was added?
A.TO ADD CARBON DIOXIDE TO THE SOLUTION THAT THE PLANT NEEDS AS A REACTANT OF PHOTOSYNTHESIS
B. To add oxygen to the solution that the plant needs as a reactant of photosynthesis
C. To keep the elodea plant from decaying
D. To keep the water from changing into another color
During the first portion of the experiment, the lights were turned off and a timer was set for 5 minutes. No bubbles were released during this 5 minutes. Which of the answer choices below is the best reason why.
A. There was no light present for photosynthesis to occur
B. There was no oxygen present for photosynthesis to occur
C. There was no carbon dioxide present for photosynthesis to occur
During the second part of the experiment you can see bubbles begin to appear when they didn't before. Which of the answer choices below is the best reason why?
A. Carbon dioxide
B. Oxygen was present in the water when it wasnt before
C. Light was applied to the scenario so photosynthesis could occur
Add a summarization of all the answers at the end.
Answers
GPT-4o mini
1. **Gas causing a green color change in bromothymol blue solution**:
**B. The presence of carbon dioxide.**
The solution turns green due to the presence of carbon dioxide, which forms carbonic acid in water, changing the pH and color of bromothymol blue.
2. **Color of water if photosynthesis has occurred**:
If photosynthesis has occurred, the color of the water would turn **blue** because the carbon dioxide is consumed, resulting in a higher pH and changing the color from yellow-green to blue.
3. **Tube #4 description**:
**D. Tube #4 is still yellow-green in color because it was unable to perform photosynthesis.**
Since Tube #4 was not exposed to light and had no elodea present, it was unable to perform photosynthesis, maintaining the yellow-green color due to the presence of carbon dioxide.
4. **Explanation for Tube #2 becoming blue**:
Tube #2 is now blue in color because the plant (elodea) performed photosynthesis in the presence of light, consuming carbon dioxide and raising the pH, which leads to the blue color in the bromothymol blue solution.
5. **Reason for adding baking soda**:
**A. TO ADD CARBON DIOXIDE TO THE SOLUTION THAT THE PLANT NEEDS AS A REACTANT OF PHOTOSYNTHESIS.**
Baking soda was added to provide a source of carbon dioxide for the plants to use in the process of photosynthesis.
6. **Reason for no bubbles in the first part**:
**A. There was no light present for photosynthesis to occur.**
The absence of light meant that photosynthesis could not take place, resulting in no bubbles being released.
7. **Reason for bubbles appearing in the second part**:
**C. Light was applied to the scenario so photosynthesis could occur.**
The appearance of bubbles indicated that photosynthesis was occurring due to the introduction of light, enabling the plants to release oxygen as a byproduct.
### Summary:
The presence of carbon dioxide changes the bromothymol blue solution to green. If photosynthesis occurs, the water will turn blue due to the consumption of carbon dioxide. Tube #4 remains yellow-green due to lack of light for photosynthesis, while Tube #2 turns blue as it undergoes photosynthesis in light. Baking soda was added to provide carbon dioxide for photosynthesis. The absence of light in the first part prevented bubble formation, while the introduction of light in the second part allowed for photosynthesis and the release of oxygen bubbles.
**B. The presence of carbon dioxide.**
The solution turns green due to the presence of carbon dioxide, which forms carbonic acid in water, changing the pH and color of bromothymol blue.
2. **Color of water if photosynthesis has occurred**:
If photosynthesis has occurred, the color of the water would turn **blue** because the carbon dioxide is consumed, resulting in a higher pH and changing the color from yellow-green to blue.
3. **Tube #4 description**:
**D. Tube #4 is still yellow-green in color because it was unable to perform photosynthesis.**
Since Tube #4 was not exposed to light and had no elodea present, it was unable to perform photosynthesis, maintaining the yellow-green color due to the presence of carbon dioxide.
4. **Explanation for Tube #2 becoming blue**:
Tube #2 is now blue in color because the plant (elodea) performed photosynthesis in the presence of light, consuming carbon dioxide and raising the pH, which leads to the blue color in the bromothymol blue solution.
5. **Reason for adding baking soda**:
**A. TO ADD CARBON DIOXIDE TO THE SOLUTION THAT THE PLANT NEEDS AS A REACTANT OF PHOTOSYNTHESIS.**
Baking soda was added to provide a source of carbon dioxide for the plants to use in the process of photosynthesis.
6. **Reason for no bubbles in the first part**:
**A. There was no light present for photosynthesis to occur.**
The absence of light meant that photosynthesis could not take place, resulting in no bubbles being released.
7. **Reason for bubbles appearing in the second part**:
**C. Light was applied to the scenario so photosynthesis could occur.**
The appearance of bubbles indicated that photosynthesis was occurring due to the introduction of light, enabling the plants to release oxygen as a byproduct.
### Summary:
The presence of carbon dioxide changes the bromothymol blue solution to green. If photosynthesis occurs, the water will turn blue due to the consumption of carbon dioxide. Tube #4 remains yellow-green due to lack of light for photosynthesis, while Tube #2 turns blue as it undergoes photosynthesis in light. Baking soda was added to provide carbon dioxide for photosynthesis. The absence of light in the first part prevented bubble formation, while the introduction of light in the second part allowed for photosynthesis and the release of oxygen bubbles.