About This Chapter
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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Other chapters within the Alberta Education Diploma - Chemistry 30: Exam Prep & Study Guide course
- Experimental Design & Measurement
- Kinetic Energy & Heat Transfer
- Energy Changes in Biochemical Reactions
- Electrochemistry Basics
- Mixtures & Solutions in Chemistry
- Inorganic & Organic Chemistry
- Comparing Compounds in Chemistry
- Monomers & Polymers
- Organic Reactions & Greenhouse Gases
- Reduction-Oxidation Reactions
- Chemical Equilibrium Overview
- Acids & Bases in Chemistry
- Alberta Education Diploma - Chemistry 30 Flashcards