Ch.6 - Thermochemistry WorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Endothermic & Exothermic Reactions

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Sections
Internal Energy
Calorimetry
Thermochemical Equation
Hess's Law
Enthalpy of Formation
End of Chapter 6 Problems
Additional Practice
Units of Energy
Endothermic & Exothermic Reactions
Additional Guides
Enthalpy

Solution: Explain the difference between endothermic reactions and exothermic reactions with respect to the bond energies of the bonds broken and formed.

Solution: Explain the difference between endothermic reactions and exothermic reactions with respect to the bond energies of the bonds broken and formed.

Problem

Explain the difference between endothermic reactions and exothermic reactions with respect to the bond energies of the bonds broken and formed.

Solution

When talking about heat changes during a chemical reaction, reactions can be classified into two types:

  • Exothermic reaction: when heat is released as a result of reaction.
  • Endothermic reaction: when heat is absorbed as a result of reaction.


A chemical reaction is a process that involved breaking of old (reactant) bonds and formation of new (product) bonds.

The process of bond breaking is endothermic (ΔH=positive), while the process of bond formation is exothermic (ΔH=negative).


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