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Ch 9: MCAS ST&E Chemistry: Thermodynamics

About This Chapter

Brush up on your comprehension of thermodynamics with help from engaging videos. Expert instructors explore Hess's law, calorimetry and more to ensure you're ready for the MCAS - Science and Technology/Engineering High School Chemistry test.

MCAS ST&E Chemistry: Thermodynamics - Chapter Summary

On the day you take the MCAS - Science and Technology/Engineering High School Chemistry test, it's good to feel prepared to answer any questions you face. This chapter is designed to help you study for thermodynamics questions. By reviewing these fun lessons, you will be able to:

  • Define and describe the law of thermodynamics and calorimetry
  • Identify state functions in thermochemistry
  • Discuss energy transfer in physical and chemical processes
  • Explain how to use Hess's law to calculate the change in enthalpy of a reaction
  • Share how to predict the entropy of physical and chemical changes
  • Describe the relationship between enthalpy, free energy and entropy
  • Provide details about endothermic and exothermic reactions

Our study guide makes studying for the test convenient by allowing you to review thermodynamics lessons in any sequence you desire and as often as you'd like. Watch lessons as videos or read them as full transcripts from your home computer, smartphone or tablet. When ready, test your knowledge of the subject area by taking lesson quizzes and a chapter exam. If you have any questions about lesson topics, feel free to submit them to our experts.

8 Lessons in Chapter 9: MCAS ST&E Chemistry: Thermodynamics
Test your knowledge with a 30-question chapter practice test
The Laws of Thermodynamics

1. The Laws of Thermodynamics

Learn about the first and second laws of thermodynamics. Find out how energy is generated, how it converts from one form to another, and what happens to energy in a closed system.

State Functions in Thermochemistry

2. State Functions in Thermochemistry

This lesson defines state functions and explains why state functions are so useful in thermochemistry and thermodynamics. You'll also see a few examples of common state functions.

Enthalpy: Energy Transfer in Physical and Chemical Processes

3. 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.

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

4. 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.

Predicting the Entropy of Physical and Chemical Changes

5. 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.

Calorimetry: Measuring Heat Transfer and Heat Capacity

6. Calorimetry: Measuring Heat Transfer and Heat Capacity

This video lesson explains the technique of calorimetry used to measure heat transfer in chemical reactions. You will see how different materials have different specific heat capacities. You will learn how to carry out heat calculations using a simple equation.

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

7. 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.

Endothermic and Exothermic Reactions

8. 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.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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