Question

Your lab partner mixed two colorless solutions in the test tube. He sees no observable changes in the resulting mixture and is unable to detect any temperature change. Based on these observations, what type of change has taken place?

• A. Physical change
• B. Chemical change
• C. Periodic change
• D. None of the above

Answer 1

The correct option is A Physical change

In a periodic change, the events are repeated after regular intervals like day and night. In the given example, no such change is taking place.

When the two solutions are mixed, we cannot conclude it is a chemical change as no precipitate formation, no evolution of gas, no change in temperature, nor any other indication of a chemical change is seen. Thus the reaction can be considered to be reversible and, the change will be physical.

Hence the correct option is A.