Bromthymol blue (BTB) is a chemical that turns yellow in the presences of carbon
ID: 1999077 • Letter: B
Question
Bromthymol blue (BTB) is a chemical that turns yellow in the presences of carbon dioxide. In the presence of oxygen, BTB stays blue. Deepa put the same amount of BTB in the three jars, and varied the organisms she placed in each jar. In Jar A, she put two aquatic snails. In Jar B, she put two springs of elodea, an aquatic plant. In Jar C, she put two snails and two sprigs of elodea. Each jar was filled with the same amount of water. Deepa examined the jars every day for three days her observations are shown in the table at right Why did the BTB solution in Jar A turn yellow? Why did the BTB solution in Jar B stay blue? Why did the BTB solution in Jar C stay blue? Which jar showed what happens during the carbon an cycles in nature? Describe the process that occurred in that Jar.Explanation / Answer
1. The snails consumes oxygen and produces carbon-di-oxide, so in the jar A the ammount of ocarbon-di-oxide increases, and BTB turns into yellow in presence of carbon-di-oxide.
2. The springs of elodea is plant, so it absorb carbon-di-oxide and produces oxygen. So in jar B the ammout of oxygen increases, and we know BTB remains blue in presence of oxygen.
3. In the jar C the snails absorbs oxygen and produces carbon-di-oxide but the springs absorbs that carbon-di-oxide and produces oxygen, so the ammount of oxygen remains same in that jar. So the BTB solution remains blue in that jar C.
4. Jar C shows the oxygen carbon cycle in nature.
In the jar C the snails absorbs oxygen and produces carbon-di-oxide but the springs absorbs that carbon-di-oxide and produces oxygen. And this same things happens in nature with animals and plants. Animals produces carbon-di-oxide and the plants absorbs that CO2 and produces oxygen and keep the balance of ogygen and carbon.
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