It is an example of physical change. The molecules are not changing, so it is not chemical, and a physical property is something that a physical thing has.
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It is mentioned that the student is mixing chemicals A and B and observes the time taken for the color to change. However, in the experiment, it is noticed that the student has repeated the procedure five times and each time he or she is modifying the concentration of chemical B. Thus, it is clear that the concentration of chemical B is the independent variable in the experiment. An independent variable is illustrated as the variable, which is controlled or modified in the experiment.
Answer:
sorry please can you snap the diagram ...the question is not clear to my understanding
