Final answer:
After the mixture is cooled by 14.2°C from an initial temperature of 3.5°C, the final temperature of the mixture will be -10.7°C.
Step-by-step explanation:
To find the temperature of the mixture after the chemist cools it down by 14.2°C from its initial temperature of 3.5°C, we simply subtract the temperature change from the initial temperature. We perform this calculation as follows:
Final Temperature = Initial Temperature - Temperature Change
Final Temperature = 3.5°C - 14.2°C
Final Temperature = -10.7°C
Thus, after cooling, the temperature of the mixture will be -10.7°C.