Overview

Grade 10 Science

Chemical Processes

7. Reactions

7.2 Energy Changes, Thermodynamics basics

Energy Changes & Thermodynamics: Master Exothermic, Endothermic Reactions & Enthalpy

Explore the fundamentals of thermodynamics from exothermic and endothermic reactions to enthalpy, activation energy, and Hess's Law and discover how energy drives every chemical reaction.

What You'll Learn

Thermodynamics studies heat flow and energy changes in chemical systems.

Exothermic reactions release heat; endothermic reactions absorb surrounding heat.

Activation energy is the barrier reactions must overcome to proceed forward.

Hess's Law allows enthalpy calculations using known reaction pathway data.

What You'll Practice

Students calculate enthalpy changes using bond energies and Hess's Law.

Questions test understanding of exothermic, endothermic, and catalyst concepts.

Learners interpret energy diagrams showing activation energy and transition states.

Why This Matters

Understanding thermodynamics and energy changes is fundamental to explaining how and why chemical reactions occur in both laboratory settings and everyday life.

This Unit Includes

Practice exercises

Learning resources

Skills

Thermodynamics

Enthalpy

Activation Energy

Hess's Law

Calorimetry

MB Curriculum Aligned