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.
- In an endothermic process, heat is ____________ (released/absorbed). In an exothermic process, heat is ______________(released/absorbed).
- Calculate qrxn for the reaction that occurs when 25.0 mL of 1.00 M HCl are added to 25.0 mL of 1.00 M NaOH in a coffee-cup calorimeter at room temperature (25.0oC). The final temperature of the solution was 31.4oC. Assume that the density of the solution is 1.00 g/mL and that Cs,soln is 4.18 J/g.oC.
- A system gains 20.4 J of internal energy while doing 30.0 J of work. Does heat enter or escape from the system? How much heat?
- How much energy does it take to heat a cup of water (242 g) from room temperature (21.0°C) to its boiling point? (look up the specific heat of water in the book)
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