A chemical reaction has been the subject of intense study, and a rate law, rate = k[A][B]2, was developed which summarised the mechanistic findings. Which one of the following changes to the system will not cause an increase in the rate constant under any circumstances?
1. adding a negative catalyst
2. lowering the temperature by 0.500 degrees
3. doubling the concentration of B
4. adding a positive catalyst
5. raising the temperature by 25.0 degrees