A piece of wood weighing 100 grams was burned. The point at which the wood bumed was 1112°F. The buming wood was placed in water and it increased the temperature of the water to 253°C. Answer the following questions deal with burning wood. and water. Remember the Cp steam is 1.996 J/g-K, and Cp water is 2.1 jg-K & cp ice is 4.2 Jig-K. Remember that heat m-cp T A. Determine whether buming wood is a physical change or a chemical change B. Convert 1112°F to K C. Convert 153°C to K D. Calculate the heat associated with steam only. Water boils at 373.15 K. E. Determine whether liquid water changing to steam is a physical change or a chemical change. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac)
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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