Part A: Exothermic and Endothermic Reactions: NH4NO3 Solution CaCl2 Solution Initial water temperature (°C) 22°C 22°C Final water temperature (°C) 19°c 24°C Temperature change Endothermic or Exothermic Add the term heat to the reactants or products in the following chemical equations. H20 NH,NO; (s) NH, * (aq) + NO; (aq) H-O CaCl, (s) Ca (aq) + 2CF (aq) Q 1: Use the knowledge you attained from the above activity and answer the following. Indicate the process that absorb energy with a positive sign (+, endothermic) and the process that releases energy with a negative sign (-, exothermic). Process Sign (+ or -) Exothermic or Endothermic Freezing water Cooking a potato in a microwave oven Burning wood log in a fireplace Digestion of food inside the body Photosynthesis
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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