IB Grade 9 Chemistry | Chapter 7: Energy Changes in Chemical Reactions by Prakhar Chauhan | Learn Smarter
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Chapter 7: Energy Changes in Chemical Reactions

Chemical reactions involve significant energy changes, either releasing or absorbing energy. Exothermic reactions release heat, often observable through temperature increases or production of light, while endothermic reactions absorb heat, resulting in cooler surroundings. Understanding these energy changes, activation energies, and the role of catalysts is crucial for controlling and optimizing chemical processes in various applications.

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Sections

  • 7

    Energy Changes In Chemical Reactions

    This section explores the role of energy changes in chemical reactions, detailing exothermic and endothermic processes.

    Learning Practice

  • 7.1

    The Role Of Energy In Chemical Transformations

    Energy changes are pivotal in chemical reactions, involving either the absorption or release of energy depending on the nature of the reaction.

    Learning Practice

  • 7.2

    Exothermic Reactions: Releasing Energy To The Surroundings

    Exothermic reactions are chemical reactions that release energy to their surroundings, primarily in the form of heat.

    Learning Practice

  • 7.2.1

    Observable Signs Of An Exothermic Reaction

    Exothermic reactions release energy into their surroundings, often manifesting as increased temperature, light, and sound.

    Learning Practice

  • 7.2.2

    Real-World Examples Of Exothermic Processes

    This section discusses exothermic reactions, highlighting real-world examples and their significance in chemical processes.

    Learning Practice

  • 7.3

    Endothermic Reactions: Absorbing Energy From The Surroundings

    Endothermic reactions absorb energy from their surroundings, resulting in a decrease in temperature.

    Learning Practice

  • 7.3.1

    Observable Signs Of An Endothermic Reaction

    This section discusses the observable signs of endothermic reactions, highlighting the energy absorption process and providing real-world examples.

    Learning Practice

  • 7.3.2

    Real-World Examples Of Endothermic Processes

    This section explores common real-world examples of endothermic processes, including photosynthesis, cold packs, melting ice, and baking bread.

    Learning Practice

  • 7.4

    Energy Profile Diagrams: Visualizing Reaction Pathways

    Energy profile diagrams illustrate the energy changes during chemical reactions, showing the energy levels of reactants, products, and activation energy.

    Learning Practice

  • 7.4.1

    Energy Profile Diagram For An Exothermic Reaction

    This section explains the energy changes during exothermic reactions, presenting energy profile diagrams to visualize these changes.

    Learning Practice

  • 7.4.2

    Energy Profile Diagram For An Endothermic Reaction

    This section explores energy profile diagrams for endothermic reactions, highlighting the energy changes occurring as the reaction progresses.

    Learning Practice

  • 7.5

    The Role Of Catalysts: Speeding Up Reactions

    Catalysts increase the rate of chemical reactions by lowering the activation energy required, without affecting the overall energy change.

    Learning Practice

  • 7.5.1

    Visualizing The Effect Of A Catalyst On An Energy Profile Diagram

    This section explains how catalysts influence the activation energy in chemical reactions and illustrates these effects using energy profile diagrams.

    Learning Practice

  • 7.5.2

    Real-World Importance Of Catalysts

    Catalysts play a crucial role in speeding up chemical reactions without being consumed, impacting various industrial and biological processes.

    Learning Practice

References

Untitled document (15).pdf

Class Notes

Memorization

What we have learnt

  • Chemical reactions involve ...
  • Exothermic reactions releas...
  • Catalysts increase reaction...

Final Test

Revision Tests