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.
![record the highest temperature achieved.
3% = mass
surroundings.
9surr = (mass of reacted mixture) (specific heat) (A1)
D F-F
9 syst = - q surr
Mass of 3.0% H2O2 solution and cup 28.O
AH = q syst/mol H2Q2 decomposed
Mass of empty cup
3.035 g
25.015 g
:75225g
247
Mass of 3.0% H2O2 solution
Mass of H2O2 in 3.0% solution
Moles H2O2 decomposed
mol
Initial temperature
23.7
36.0
30.288
27.2538
°C
Final temperature
°C
Mass of reacted mixture & cup
Mass of reacted mixture
·AT
12.3
1402
- 1402
°C
4 sur
kJ
9 syst
kJ )
ΔΗ
kJ/mol
Questions:
1. The experimental value for AH you determined in part III is probably differe
the value predicted in the calculation in part II. Considering the experimental p
laboratory equipment and chemicals you used, provide as many explanations a
for the discrepancy.
2 By considering the states of the, reactants and products, what is the sign of t
change for this reaction? poS, TIve
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