Today we learned about energy change in the form of heat- heat released as a result of a reaction, or heat released as a reaction proceeds. The energy actually comes from after the bonds are broken, when the bonds are reformed. Whenever energy leaves a system it is called exothermic and whenever energy enters the system it is called endothermic.
Mrs. Frank also specified that we can't just stick a thermometer into a system, so whenever we read the temperature we are reading the temperature just outside the system. She introduced to us the equation of Q = mcΔT which we then put into practical use and calculated energy resulting after bonds have reformed. Overall I thought it was very easy. I am going to practice a few problems tonight just to make sure I have it down.
This is a great description of the lesson, Ben! It's really good to review for the final, too.
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