1. Write the thermochemical equation for the chemical reaction (Use two ways in writing the equation) 2. What does the sign of ΔH indicate? 3. Is the reaction endothermic or exothermic? what happens to heat when the reaction takes place? 4. If 3 moles of nitrogen gas, N2, are made to react with three moles of oxygen gas, O2, how much heat is required in the process?
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.
1. Write the thermochemical equation for the
equation)
2. What does the sign of ΔH indicate?
3. Is the reaction endothermic or exothermic? what happens to heat when the reaction takes
place?
4. If 3 moles of nitrogen gas, N2, are made to react with three moles of oxygen gas, O2, how
much heat is required in the process?
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