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Ch 3: Enthalpy in Chemistry

About This Chapter

Learn about enthalpy in chemistry, which includes subjects like endothermic reactions, Hess's law, and enthalpy diagrams. These brief lessons and quizzes can help you prepare for an exam or complete your homework or chemistry projects.

Enthalpy in Chemistry - Chapter Summary

While studying these lessons, you will strengthen your understanding of enthalpy in chemistry. Some of the topics covered include exothermic reactions and the steps to calculate enthalpy outputs. This chapter can also help you understand how to rank reactions by enthalpy changes. After reviewing the lessons, you should be ready to do the following:

  • Discuss the relationships between chemistry and energy
  • Define bond enthalpy
  • Calculate the standard enthalpy change of a chemical reaction
  • Predict the entropy of physical changes
  • Explain what happens when endothermic and exothermic reactions occur
  • Use Hess's law to calculate the change in enthalpy of a reaction
  • Draw and label enthalpy diagrams
  • Explain the relationship between free energy, enthalpy, and entropy

A brief quiz is included with each lesson to test your understanding of topics covered, and the quizzes can be printed for use as an offline study tool. Additionally, the quizzes link back to specific topics in the video, so if you get a question wrong you can re-review that topic with just one click.

11 Lessons in Chapter 3: Enthalpy in Chemistry
Test your knowledge with a 30-question chapter practice test
Enthalpy: Energy Transfer in Physical and Chemical Processes

1. Enthalpy: Energy Transfer in Physical and Chemical Processes

This video explores the relationship between chemistry and energy. We learn the general properties of energy and the concepts of temperature and heat. We will learn about energy flow and consider the enthalpy change during chemical reactions.

Bond Enthalpy: Definition, Calculations & Values

2. Bond Enthalpy: Definition, Calculations & Values

When a chemical reaction occurs, chemical bonds are broken and formed. Energy is required to break bonds when a chemical reaction occurs, and this is called the bond enthalpy. In this lesson, we will discuss the bond enthalpy in chemical reactions.

Standard Enthalpy of Formation: Explanation & Calculations

3. Standard Enthalpy of Formation: Explanation & Calculations

In this video lesson, we learn about the standard enthalpies of formation of substances. We will also learn how we can use these values as one way to calculate the standard enthalpy change of a chemical reaction.

Predicting the Entropy of Physical and Chemical Changes

4. Predicting the Entropy of Physical and Chemical Changes

Ever wonder why your bedroom always ends up a mess within hours of you tidying up? That is the magic of entropy. In this lesson, you'll learn why disorder is the natural state of matter and how we can predict entropy change in a physical or chemical reaction.

Endothermic and Exothermic Reactions

5. Endothermic and Exothermic Reactions

Explore a chemical reaction at the molecular level. Learn about exothermic and endothermic reactions, what they look like and what happens when they occur. Understand enthalpy and how you can use it to predict whether a reaction will be exothermic or endothermic.

Endothermic Reaction: Definition & Example

6. Endothermic Reaction: Definition & Example

Chemical reactions usually involve the exchange of energy in some form. In this lesson, you will learn about a type of reaction known as an endothermic reaction.

Enthalpy Change: Definition & Calculation

7. Enthalpy Change: Definition & Calculation

In this lesson, we will learn how much energy is in a reaction and what can drive that reaction forward. We will also learn how to calculate the efficiency of that reaction.

Using Hess's Law to Calculate the Change in Enthalpy of a Reaction

8. Using Hess's Law to Calculate the Change in Enthalpy of a Reaction

Want to make sure you don't blow yourself up during a chemical reaction? This lesson will help you avoid this by teaching you Hess's Law. This is one way to calculate the heat transferred, or enthalpy change, of a chemical reaction.

How to Draw & Label Enthalpy Diagrams

9. How to Draw & Label Enthalpy Diagrams

An enthalpy diagram allows us to easily see details of a chemical reaction. By knowing how to draw and label an enthalpy diagram we can see what the starting energy level is, how much energy is needed to get the reaction going, and what energy is left at the end of a chemical reaction.

How to Rank Reactions by Enthalpy Changes

10. How to Rank Reactions by Enthalpy Changes

This lesson describes the difference between exothermic and endothermic chemical reactions. We then show to rank enthalpy changes for chemical reactions, from least to most exothermic or endothermic, depending on the sign of the enthalpy change.

The Relationship Between Enthalpy (H), Free Energy (G) and Entropy (S)

11. The Relationship Between Enthalpy (H), Free Energy (G) and Entropy (S)

In this video lesson, we'll study free energy (G) and its relationship to enthalpy, entropy and temperature. You'll also learn why free energy (G) is the single most useful criterion for predicting the spontaneity and direction of a chemical reaction.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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