1. Does this graph represent an endothermic or an exothermic 250 reaction? Explain your answer. 200 PE 150 (kJ) 2. What is the energy of the reactants? 100 50 3. What is the energy of the products? Reaction pathway 4. Find the change in enthalpy for this reaction.

1. Does this graph represent an endothermic or an exothermic 250 reaction? Explain your answer. 200 PE 150 (kJ) 2. What is the energy of the reactants? 100 50 3. What is the energy of the products? Reaction pathway 4. Find the change in enthalpy for this reaction.

Introductory Chemistry For Today

8th Edition

ISBN:9781285644561

Author:Seager

Publisher:Seager

Chapter8: Reaction Rates And Equilibrium

Section: Chapter Questions

Problem 8.75E

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Concept explainers

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.

Question

1. Does this graph represent an
endothermic or an exothermic
250
reaction? Explain your answer.
200
PE
150
(kJ)
2. What is the energy of the reactants?
100
50
3. What is the energy of the products?
Reaction pathway
4. Find the change in enthalpy for this
reaction.

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