Activity 1: S OLVE ME BABY ONE MORE TIME! Directions: Calculate the change in energy for the following processes.Determine if the process is endothermic or exothermic. 1. A gas releases 35 J of heat as 84 J of w was done to compress it. 2. A gas absorbs 48 J of heat as it does 72 J of work by expanding. LESSON 2: Enthalpy of a Chemical Reaction Most chemical reactions in laboratories and even in living systems occur under constant pressure. When such chemical reactions are carried out in vessels exposed to atmospheric pressure, energy changes between the system and the surroundingsusually involve heat transfer only since the amount of work involved is negligible under this condition. We have stated that the chong
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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