Work and heat
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This is a very important concept in chemistry. You can read about it in your book. If you don't own a chemistry book, read about it here: http://finedrafts.com/files/CUNY/chemistry/General/Zumdahl%20etal/Atoms%20First%20Approach/Ch06%20Chemical%20Energy.pdf It's too large of a topic to discuss and condense into this chat box.
An exothermic response is a compound or physical response that discharges warm. It gives net vitality to its environment. That is, the vitality expected to start the response is not exactly the vitality discharged. At the point when the medium in which the response is occurring picks up warmth, the response is exothermic. http://www.courseworklabs.co.uk/ thinking at the point when utilizing a calorimeter, the aggregate sum of warmth that streams into (or through) the calorimeter is the negative of the net change in vitality of the framework. The outright measure of vitality in a compound framework is hard to gauge or figure. The enthalpy change, ΔH, of a concoction response is much simpler to work with. The enthalpy change levels with the change in inside vitality of the framework in addition to the work expected to change the volume of the framework against steady surrounding weight.