Use the data in the table to plot a heating curve of temperature versus time for a 180-g sample of water as it is heated at a constant rate from -20°C to 120°C. Draw a best-fit line through the points. Note the time required for water to pass through each segment of the graph. ( Time and Temperature Data for Water Time Temp. Time Temp (min) (°C) (min) (C) O -20 100 1 0 100 2 0 100 3 9 100 4 26 100 5 42 100 6 58 100 71 100 83 100 92 100 98 100 100 100 100 120 700 8 9 10 11 12 3456 13 14 15 16 17 819 20 21 22 23 24 25
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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