Collection of learning resources for students aligned with Next Generation Science Standard HS-PS1-4.

052 - Bond Length and Bond Energy

In this video Paul Andersen explains how the bond length and bond energy are calculated using an energy distance graph. The strength of the bond is determined by the charges in the constituent atoms. As the charge increases the bond energy increases and the bond length decreases. Increasing numbers of bonds will also increase the energy and decrease the length.ex....

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Enthalpy of a Reaction

by Colt McNealy

053 - Enthalpy of Reaction

In this video Paul Andersen explains how the enthalpy of a reaction can be released in an exothermic or consumed in an endothermic reaction. According to Hess's law if the reaction is reversed the sign of the enthalpy of reaction is also reversed. The overall enthalpy of reaction is the sum of all the individual reactions. A couple of enthalpy of reaction problems are worked out as well.

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033 - Endothermic and Exothermic Reactions

In this video Paul Andersen explains how heat can be absorbed in endothermic or released in exothermic reactions. An energy diagram can be used to show energy movements in these reactions and temperature can be used to measure them macroscopically.

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This folder contains resources about chemical thermodynamics.

This unit is part of the Chemistry collection, an open source California digital textbook plus supplementary resources.

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Click HERE to download the chapter as a PDF.

Chapter 14, Energy Changes in Chemical Reactions comes from the FHSST (Free High School Science Texts) Chemistry textbook. FHSST is a project that aims to provide free science and mathematics textbooks for Grades 10 to 12 science learners. The project was initiated by young South African scientists, and now brings together scientists from around the world who are willing to contribute to the writing of the books.

Below is a complete Table of Contents for this chapter.

This resource is part of the FHSST Chemistry collection.

TABLE OF CONTENTS

III CHEMICAL CHANGE

14 Energy Changes In Chemical Reactions - Grade 11

14.1 What causes the energy changes in chemical reactions? . . . . . . . . . . . . . . 255

14.2 Exothermic and endothermic reactions . . . . . . . . . . . . . . . . . . . . . . . 255

14.3 The heat of reaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257

14.4 Examples of endothermic and exothermic reactions . . . . . . . . . . . . . . . . 259

14.5 Spontaneous and non-spontaneous reactions . . . . . . . . . . . . . . . . . . . . 260

14.6 Activation energy and the activated complex . . . . . . . . . . . . . . . . . . . . 261

14.7 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264

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