Due Date: Wednesday March 20, 2019
Step 1) The students poured fresh water into a beaker and added a few drops of a chemical solution called bromthymol blue. The water in the beaker turned blue.
Step 2) One student blew through a straw into the water in the beaker. The water in the beaker turned from blue to yellow.
Step 3) The students then placed some waterweed (a plant) into the water in the beaker and placed the beaker under a bright light.
Step 4) After a short period of time, the students observed the beaker. The water had turned blue again and there were bubbles on the waterweed leaves.
The setup of this investigation is shown below.
- The water changed from blue to yellow when the student blew into it (Step 2). Identify the compound that caused the water to change from blue to yellow.
- Explain why the water turned blue again when the beaker with the waterweed was under the bright light (Step 4). In your explanation, identify the process that caused this change.
- Explain why there were bubbles on the waterweed leaves (Step 4).
- Identify the reactants and the products of the process that caused the changes in Step 4.