For Q=mcΔT my temperature change is negative (it went from 189.5 to 45.2)(and the change in temp is the final temp-initial temp) but this doesn’t make sense because then the Q would be negative.
Sure. If your temperature went down then you delta t would be negative (t final – t initial).
Q is heat energy in a system, and a system can lose heat. Q can be negative, meaning that your system has indeed lost heat. Since heat is lost, this indicates an exothermic reaction.
hope this helped. good luck!Source(s): chem major